mcfg: refactor so as to use new mcmp.Component type, and use the option pattern to reduce number of arguments to parameters
This commit is contained in:
Brian Picciano
parent
a30edfb5f9
commit
dd2d601081
154
mcfg/cli.go
154
mcfg/cli.go
@ -1,7 +1,6 @@
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package mcfg
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import (
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"context"
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"fmt"
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"io"
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"os"
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@ -9,6 +8,7 @@ import (
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"sort"
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"strings"
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"github.com/mediocregopher/mediocre-go-lib/mcmp"
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"github.com/mediocregopher/mediocre-go-lib/mctx"
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"github.com/mediocregopher/mediocre-go-lib/merr"
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)
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@ -25,64 +25,76 @@ type cliTail struct {
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descr string
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}
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// WithCLITail returns a Context which modifies the behavior of SourceCLI's
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// Parse. Normally when SourceCLI encounters an unexpected Arg it will
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// immediately return an error. This function modifies the Context to indicate
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// to Parse that the unexpected Arg, and all subsequent Args (i.e. the tail),
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// should be set to the returned []string value.
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// CLITail modifies the behavior of SourceCLI's Parse. Normally when SourceCLI
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// encounters an unexpected Arg it will immediately return an error. This
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// function modifies the Component to indicate to Parse that the unexpected Arg,
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// and all subsequent Args (i.e. the tail), should be set to the returned
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// []string value.
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//
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// The descr (optional) will be appended to the "Usage" line which is printed
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// with the help document when "-h" is passed in.
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func WithCLITail(ctx context.Context, descr string) (context.Context, *[]string) {
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if ctx.Value(cliKeyTail) != nil {
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panic("WithCLITail already called in this Context")
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//
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// This function panics if not called on a root Component (i.e. a Component
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// which has no parents).
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func CLITail(cmp *mcmp.Component, descr string) *[]string {
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if len(cmp.Path()) != 0 {
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panic("CLITail can only be used on a root Component")
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}
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tailPtr := new([]string)
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ctx = context.WithValue(ctx, cliKeyTail, cliTail{
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cmp.SetValue(cliKeyTail, cliTail{
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dst: tailPtr,
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descr: descr,
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})
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return ctx, tailPtr
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return tailPtr
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}
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func populateCLITail(ctx context.Context, tail []string) bool {
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ct, ok := ctx.Value(cliKeyTail).(cliTail)
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func populateCLITail(cmp *mcmp.Component, tail []string) bool {
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ct, ok := cmp.Value(cliKeyTail).(cliTail)
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if ok {
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*ct.dst = tail
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}
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return ok
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}
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func getCLITailDescr(ctx context.Context) string {
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ct, _ := ctx.Value(cliKeyTail).(cliTail)
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func getCLITailDescr(cmp *mcmp.Component) string {
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ct, _ := cmp.Value(cliKeyTail).(cliTail)
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return ct.descr
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}
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type subCmd struct {
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name, descr string
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flag *bool
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callback func(context.Context) context.Context
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callback func(*mcmp.Component)
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}
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// WithCLISubCommand establishes a sub-command which can be activated on the
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// CLISubCommand establishes a sub-command which can be activated on the
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// command-line. When a sub-command is given on the command-line, the bool
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// returned for that sub-command will be set to true.
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//
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// Additionally, the Context which was passed into Parse (i.e. the one passed
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// into Populate) will be passed into the given callback, and the returned one
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// used for subsequent parsing. This allows for setting sub-command specific
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// Params, sub-command specific runtime behavior (via mrun.WithStartHook),
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// support for sub-sub-commands, and more. The callback may be nil.
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// Additionally, the Component which was passed into Parse (i.e. the one passed
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// into Populate) will be passed into the given callback, and can be modified
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// for subsequent parsing. This allows for setting sub-command specific Params,
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// sub-command specific runtime behavior (via mrun.WithStartHook), support for
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// sub-sub-commands, and more. The callback may be nil.
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//
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// If any sub-commands have been defined on a Context which is passed into
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// If any sub-commands have been defined on a Component which is passed into
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// Parse, it is assumed that a sub-command is required on the command-line.
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//
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// Sub-commands must be specified before any other options on the command-line.
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func WithCLISubCommand(ctx context.Context, name, descr string, callback func(context.Context) context.Context) (context.Context, *bool) {
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m, _ := ctx.Value(cliKeySubCmdM).(map[string]subCmd)
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// When parsing the command-line options, it is assumed that sub-commands will
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// be found before any other options.
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//
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// This function panics if not called on a root Component (i.e. a Component
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// which has no parents).
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func CLISubCommand(cmp *mcmp.Component, name, descr string, callback func(*mcmp.Component)) *bool {
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if len(cmp.Path()) != 0 {
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panic("CLISubCommand can only be used on a root Component")
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}
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m, _ := cmp.Value(cliKeySubCmdM).(map[string]subCmd)
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if m == nil {
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m = map[string]subCmd{}
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ctx = context.WithValue(ctx, cliKeySubCmdM, m)
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cmp.SetValue(cliKeySubCmdM, m)
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}
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flag := new(bool)
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@ -92,7 +104,7 @@ func WithCLISubCommand(ctx context.Context, name, descr string, callback func(co
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flag: flag,
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callback: callback,
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}
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return ctx, flag
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return flag
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}
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// SourceCLI is a Source which will parse configuration from the CLI.
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@ -100,27 +112,30 @@ func WithCLISubCommand(ctx context.Context, name, descr string, callback func(co
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// Possible CLI options are generated by joining a Param's Path and Name with
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// dashes. For example:
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//
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// ctx := mctx.New()
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// ctx = mctx.ChildOf(ctx, "foo")
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// ctx = mctx.ChildOf(ctx, "bar")
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// addr := mcfg.String(ctx, "addr", "", "Some address")
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// cmp := new(mcmp.Component)
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// cmpFoo = cmp.Child("foo")
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// cmpFooBar = foo.Child("bar")
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// addr := mcfg.String(cmpFooBar, "addr", "", "Some address")
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// // the CLI option to fill addr will be "--foo-bar-addr"
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//
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// If the "-h" option is seen then a help page will be printed to
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// stdout and the process will exit. Since all normally-defined parameters must
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// being with double-dash ("--") they won't ever conflict with the help option.
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// If the "-h" option is seen then a help page will be printed to stdout and the
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// process will exit. Since all normally-defined parameters must being with
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// double-dash ("--") they won't ever conflict with the help option.
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//
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// SourceCLI behaves a little differently with boolean parameters. Setting the
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// value of a boolean parameter directly _must_ be done with an equals, for
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// example: `--boolean-flag=1` or `--boolean-flag=false`. Using the
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// space-separated format will not work. If a boolean has no equal-separated
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// value it is assumed to be setting the value to `true`, as would be expected.
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// value of a boolean parameter directly _must_ be done with an equals, or with
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// no value at all. For example: `--boolean-flag`, `--boolean-flag=1` or
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// `--boolean-flag=false`. Using the space-separated format will not work. If a
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// boolean has no equal-separated value it is assumed to be setting the value to
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// `true`.
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type SourceCLI struct {
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Args []string // if nil then os.Args[1:] is used
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DisableHelpPage bool
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}
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var _ Source = new(SourceCLI)
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const (
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cliKeyJoin = "-"
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cliKeyPrefix = "--"
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@ -128,51 +143,51 @@ const (
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cliHelpArg = "-h"
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)
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// Parse implements the method for the Source interface
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func (cli *SourceCLI) Parse(ctx context.Context) (context.Context, []ParamValue, error) {
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// Parse implements the method for the Source interface.
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func (cli *SourceCLI) Parse(cmp *mcmp.Component) ([]ParamValue, error) {
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args := cli.Args
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if cli.Args == nil {
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args = os.Args[1:]
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}
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return cli.parse(ctx, nil, args)
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return cli.parse(cmp, nil, args)
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}
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func (cli *SourceCLI) parse(
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ctx context.Context,
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cmp *mcmp.Component,
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subCmdPrefix, args []string,
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) (
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context.Context,
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[]ParamValue,
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error,
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) {
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pM, err := cli.cliParams(CollectParams(ctx))
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pM, err := cli.cliParams(CollectParams(cmp))
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if err != nil {
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return nil, nil, err
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return nil, err
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}
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printHelpAndExit := func() {
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cli.printHelp(ctx, os.Stderr, subCmdPrefix, pM)
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// TODO check DisableHelpPage here?
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cli.printHelp(cmp, os.Stderr, subCmdPrefix, pM)
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os.Stderr.Sync()
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os.Exit(1)
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}
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// if sub-commands were defined on this Context then handle that first. One
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// of them should have been given, in which case send the Context through
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// the callback to obtain a new one (which presumably has further config
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// options the previous didn't) and call parse again.
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subCmdM, _ := ctx.Value(cliKeySubCmdM).(map[string]subCmd)
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// if sub-commands were defined on this Component then handle that first.
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// One of them should have been given, in which case send the Context
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// through the callback to obtain a new one (which presumably has further
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// config options the previous didn't) and call parse again.
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subCmdM, _ := cmp.Value(cliKeySubCmdM).(map[string]subCmd)
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if len(subCmdM) > 0 {
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subCmd, args, ok := cli.getSubCmd(subCmdM, args)
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if !ok {
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printHelpAndExit()
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}
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ctx = context.WithValue(ctx, cliKeySubCmdM, nil)
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cmp.SetValue(cliKeySubCmdM, nil)
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if subCmd.callback != nil {
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ctx = subCmd.callback(ctx)
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subCmd.callback(cmp)
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}
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subCmdPrefix = append(subCmdPrefix, subCmd.name)
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*subCmd.flag = true
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return cli.parse(ctx, subCmdPrefix, args)
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return cli.parse(cmp, subCmdPrefix, args)
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}
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// if sub-commands were not set, then proceed with normal command-line arg
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@ -208,11 +223,11 @@ func (cli *SourceCLI) parse(
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break
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}
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if !pOk {
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if ok := populateCLITail(ctx, args[i:]); ok {
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return ctx, pvs, nil
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if ok := populateCLITail(cmp, args[i:]); ok {
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return pvs, nil
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}
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ctx := mctx.Annotate(context.Background(), "param", arg)
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return nil, nil, merr.New("unexpected config parameter", ctx)
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return nil, merr.New("unexpected config parameter",
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mctx.Annotated("param", arg))
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}
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}
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@ -231,7 +246,7 @@ func (cli *SourceCLI) parse(
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pvs = append(pvs, ParamValue{
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Name: p.Name,
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Path: mctx.Path(p.Context),
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Path: p.Component.Path(),
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Value: p.fuzzyParse(pvStrVal),
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})
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@ -242,11 +257,11 @@ func (cli *SourceCLI) parse(
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pvStrValOk = false
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}
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if pOk && !pvStrValOk {
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ctx := mctx.Annotate(p.Context, "param", key)
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return nil, nil, merr.New("param expected a value", ctx)
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ctx := mctx.Annotate(p.Component.Annotated(), "param", key)
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return nil, merr.New("param expected a value", ctx)
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}
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return ctx, pvs, nil
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return pvs, nil
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}
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func (cli *SourceCLI) getSubCmd(subCmdM map[string]subCmd, args []string) (subCmd, []string, bool) {
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@ -265,14 +280,14 @@ func (cli *SourceCLI) getSubCmd(subCmdM map[string]subCmd, args []string) (subCm
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func (cli *SourceCLI) cliParams(params []Param) (map[string]Param, error) {
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m := map[string]Param{}
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for _, p := range params {
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key := strings.Join(append(mctx.Path(p.Context), p.Name), cliKeyJoin)
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key := strings.Join(append(p.Component.Path(), p.Name), cliKeyJoin)
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m[cliKeyPrefix+key] = p
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}
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return m, nil
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}
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func (cli *SourceCLI) printHelp(
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ctx context.Context,
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cmp *mcmp.Component,
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w io.Writer,
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subCmdPrefix []string,
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pM map[string]Param,
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@ -313,7 +328,7 @@ func (cli *SourceCLI) printHelp(
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subCmd
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}
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subCmdM, _ := ctx.Value(cliKeySubCmdM).(map[string]subCmd)
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subCmdM, _ := cmp.Value(cliKeySubCmdM).(map[string]subCmd)
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subCmdA := make([]subCmdEntry, 0, len(subCmdM))
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for name, subCmd := range subCmdM {
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subCmdA = append(subCmdA, subCmdEntry{name: name, subCmd: subCmd})
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@ -333,7 +348,7 @@ func (cli *SourceCLI) printHelp(
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if len(pA) > 0 {
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fmt.Fprint(w, " [options]")
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}
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if descr := getCLITailDescr(ctx); descr != "" {
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if descr := getCLITailDescr(cmp); descr != "" {
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fmt.Fprintf(w, " %s", descr)
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}
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fmt.Fprint(w, "\n\n")
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@ -359,11 +374,6 @@ func (cli *SourceCLI) printHelp(
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}
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fmt.Fprint(w, "\n")
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if usage := p.Usage; usage != "" {
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// make all usages end with a period, because I say so
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usage = strings.TrimSpace(usage)
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if !strings.HasSuffix(usage, ".") {
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usage += "."
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}
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fmt.Fprintln(w, "\t\t"+usage)
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}
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fmt.Fprint(w, "\n")
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152
mcfg/cli_test.go
152
mcfg/cli_test.go
@ -2,13 +2,13 @@ package mcfg
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import (
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"bytes"
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"context"
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"fmt"
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"regexp"
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"strings"
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. "testing"
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"time"
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"github.com/mediocregopher/mediocre-go-lib/mcmp"
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"github.com/mediocregopher/mediocre-go-lib/mrand"
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"github.com/mediocregopher/mediocre-go-lib/mtest/massert"
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"github.com/mediocregopher/mediocre-go-lib/mtest/mchk"
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@ -17,37 +17,38 @@ import (
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)
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func TestSourceCLIHelp(t *T) {
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assertHelp := func(ctx context.Context, subCmdPrefix []string, exp string) {
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assertHelp := func(cmp *mcmp.Component, subCmdPrefix []string, exp string) {
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buf := new(bytes.Buffer)
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src := &SourceCLI{}
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pM, err := src.cliParams(CollectParams(ctx))
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pM, err := src.cliParams(CollectParams(cmp))
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require.NoError(t, err)
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src.printHelp(ctx, buf, subCmdPrefix, pM)
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src.printHelp(cmp, buf, subCmdPrefix, pM)
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out := buf.String()
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ok := regexp.MustCompile(exp).MatchString(out)
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assert.True(t, ok, "exp:%s (%q)\ngot:%s (%q)", exp, exp, out, out)
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}
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ctx := context.Background()
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assertHelp(ctx, nil, `^Usage: \S+
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cmp := new(mcmp.Component)
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assertHelp(cmp, nil, `^Usage: \S+
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$`)
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assertHelp(ctx, []string{"foo", "bar"}, `^Usage: \S+ foo bar
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assertHelp(cmp, []string{"foo", "bar"}, `^Usage: \S+ foo bar
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$`)
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ctx, _ = WithInt(ctx, "foo", 5, "Test int param ") // trailing space should be trimmed
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ctx, _ = WithBool(ctx, "bar", "Test bool param.")
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ctx, _ = WithString(ctx, "baz", "baz", "Test string param")
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ctx, _ = WithRequiredString(ctx, "baz2", "")
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ctx, _ = WithRequiredString(ctx, "baz3", "")
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Int(cmp, "foo", ParamDefault(5), ParamUsage("Test int param ")) // trailing space should be trimmed
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Bool(cmp, "bar", ParamUsage("Test bool param."))
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String(cmp, "baz", ParamDefault("baz"), ParamUsage("Test string param"))
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String(cmp, "baz2", ParamUsage("Required string param"), ParamRequired())
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String(cmp, "baz3", ParamRequired())
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assertHelp(ctx, nil, `^Usage: \S+ \[options\]
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assertHelp(cmp, nil, `^Usage: \S+ \[options\]
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Options:
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--baz2 \(Required\)
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Required string param.
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--baz3 \(Required\)
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@ -62,11 +63,12 @@ Options:
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$`)
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assertHelp(ctx, []string{"foo", "bar"}, `^Usage: \S+ foo bar \[options\]
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assertHelp(cmp, []string{"foo", "bar"}, `^Usage: \S+ foo bar \[options\]
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Options:
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--baz2 \(Required\)
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Required string param.
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--baz3 \(Required\)
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@ -81,9 +83,9 @@ Options:
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$`)
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ctx, _ = WithCLISubCommand(ctx, "first", "First sub-command", nil)
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ctx, _ = WithCLISubCommand(ctx, "second", "Second sub-command", nil)
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assertHelp(ctx, []string{"foo", "bar"}, `^Usage: \S+ foo bar <sub-command> \[options\]
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CLISubCommand(cmp, "first", "First sub-command", nil)
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CLISubCommand(cmp, "second", "Second sub-command", nil)
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assertHelp(cmp, []string{"foo", "bar"}, `^Usage: \S+ foo bar <sub-command> \[options\]
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Sub-commands:
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@ -93,6 +95,7 @@ Sub-commands:
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Options:
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--baz2 \(Required\)
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Required string param.
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--baz3 \(Required\)
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@ -107,8 +110,8 @@ Options:
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$`)
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ctx, _ = WithCLITail(ctx, "[arg...]")
|
||||
assertHelp(ctx, nil, `^Usage: \S+ <sub-command> \[options\] \[arg\.\.\.\]
|
||||
CLITail(cmp, "[arg...]")
|
||||
assertHelp(cmp, nil, `^Usage: \S+ <sub-command> \[options\] \[arg\.\.\.\]
|
||||
|
||||
Sub-commands:
|
||||
|
||||
@ -118,6 +121,7 @@ Sub-commands:
|
||||
Options:
|
||||
|
||||
--baz2 \(Required\)
|
||||
Required string param.
|
||||
|
||||
--baz3 \(Required\)
|
||||
|
||||
@ -165,11 +169,11 @@ func TestSourceCLI(t *T) {
|
||||
s := ss.(state)
|
||||
p := a.Params.(params)
|
||||
|
||||
s.srcCommonState = s.srcCommonState.applyCtxAndPV(p.srcCommonParams)
|
||||
s.srcCommonState = s.srcCommonState.applyCmpAndPV(p.srcCommonParams)
|
||||
if !p.unset {
|
||||
arg := cliKeyPrefix
|
||||
if len(p.path) > 0 {
|
||||
arg += strings.Join(p.path, cliKeyJoin) + cliKeyJoin
|
||||
if path := p.cmp.Path(); len(path) > 0 {
|
||||
arg += strings.Join(path, cliKeyJoin) + cliKeyJoin
|
||||
}
|
||||
arg += p.name
|
||||
if !p.isBool {
|
||||
@ -194,10 +198,10 @@ func TestSourceCLI(t *T) {
|
||||
}
|
||||
}
|
||||
|
||||
func TestWithCLITail(t *T) {
|
||||
ctx := context.Background()
|
||||
ctx, _ = WithInt(ctx, "foo", 5, "")
|
||||
ctx, _ = WithBool(ctx, "bar", "")
|
||||
func TestCLITail(t *T) {
|
||||
cmp := new(mcmp.Component)
|
||||
Int(cmp, "foo", ParamDefault(5))
|
||||
Bool(cmp, "bar")
|
||||
|
||||
type testCase struct {
|
||||
args []string
|
||||
@ -228,8 +232,8 @@ func TestWithCLITail(t *T) {
|
||||
}
|
||||
|
||||
for _, tc := range cases {
|
||||
ctx, tail := WithCLITail(ctx, "foo")
|
||||
_, err := Populate(ctx, &SourceCLI{Args: tc.args})
|
||||
tail := CLITail(cmp, "foo")
|
||||
err := Populate(cmp, &SourceCLI{Args: tc.args})
|
||||
massert.Require(t, massert.Comment(massert.All(
|
||||
massert.Nil(err),
|
||||
massert.Equal(tc.expTail, *tail),
|
||||
@ -237,13 +241,13 @@ func TestWithCLITail(t *T) {
|
||||
}
|
||||
}
|
||||
|
||||
func ExampleWithCLITail() {
|
||||
ctx := context.Background()
|
||||
ctx, foo := WithInt(ctx, "foo", 1, "Description of foo.")
|
||||
ctx, tail := WithCLITail(ctx, "[arg...]")
|
||||
ctx, bar := WithString(ctx, "bar", "defaultVal", "Description of bar.")
|
||||
func ExampleCLITail() {
|
||||
cmp := new(mcmp.Component)
|
||||
foo := Int(cmp, "foo", ParamDefault(1), ParamUsage("Description of foo."))
|
||||
tail := CLITail(cmp, "[arg...]")
|
||||
bar := String(cmp, "bar", ParamDefault("defaultVal"), ParamUsage("Description of bar."))
|
||||
|
||||
_, err := Populate(ctx, &SourceCLI{
|
||||
err := Populate(cmp, &SourceCLI{
|
||||
Args: []string{"--foo=100", "arg1", "arg2", "arg3"},
|
||||
})
|
||||
|
||||
@ -251,9 +255,9 @@ func ExampleWithCLITail() {
|
||||
// Output: err:<nil> foo:100 bar:defaultVal tail:[]string{"arg1", "arg2", "arg3"}
|
||||
}
|
||||
|
||||
func TestWithCLISubCommand(t *T) {
|
||||
func TestCLISubCommand(t *T) {
|
||||
var (
|
||||
ctx context.Context
|
||||
cmp *mcmp.Component
|
||||
foo *int
|
||||
bar *int
|
||||
baz *int
|
||||
@ -262,22 +266,20 @@ func TestWithCLISubCommand(t *T) {
|
||||
)
|
||||
reset := func() {
|
||||
foo, bar, baz, aFlag, bFlag = nil, nil, nil, nil, nil
|
||||
ctx = context.Background()
|
||||
ctx, foo = WithInt(ctx, "foo", 0, "Description of foo.")
|
||||
ctx, aFlag = WithCLISubCommand(ctx, "a", "Description of a.",
|
||||
func(ctx context.Context) context.Context {
|
||||
ctx, bar = WithInt(ctx, "bar", 0, "Description of bar.")
|
||||
return ctx
|
||||
cmp = new(mcmp.Component)
|
||||
foo = Int(cmp, "foo")
|
||||
aFlag = CLISubCommand(cmp, "a", "Description of a.",
|
||||
func(cmp *mcmp.Component) {
|
||||
bar = Int(cmp, "bar")
|
||||
})
|
||||
ctx, bFlag = WithCLISubCommand(ctx, "b", "Description of b.",
|
||||
func(ctx context.Context) context.Context {
|
||||
ctx, baz = WithInt(ctx, "baz", 0, "Description of baz.")
|
||||
return ctx
|
||||
bFlag = CLISubCommand(cmp, "b", "Description of b.",
|
||||
func(cmp *mcmp.Component) {
|
||||
baz = Int(cmp, "baz")
|
||||
})
|
||||
}
|
||||
|
||||
reset()
|
||||
_, err := Populate(ctx, &SourceCLI{
|
||||
err := Populate(cmp, &SourceCLI{
|
||||
Args: []string{"a", "--foo=1", "--bar=2"},
|
||||
})
|
||||
massert.Require(t,
|
||||
@ -290,7 +292,7 @@ func TestWithCLISubCommand(t *T) {
|
||||
)
|
||||
|
||||
reset()
|
||||
_, err = Populate(ctx, &SourceCLI{
|
||||
err = Populate(cmp, &SourceCLI{
|
||||
Args: []string{"b", "--foo=1", "--baz=3"},
|
||||
})
|
||||
massert.Require(t,
|
||||
@ -303,40 +305,48 @@ func TestWithCLISubCommand(t *T) {
|
||||
)
|
||||
}
|
||||
|
||||
func ExampleWithCLISubCommand() {
|
||||
// Create a new Context with a parameter "foo", which can be used across all
|
||||
// sub-commands.
|
||||
ctx := context.Background()
|
||||
ctx, foo := WithInt(ctx, "foo", 0, "Description of foo.")
|
||||
func ExampleCLISubCommand() {
|
||||
var (
|
||||
cmp *mcmp.Component
|
||||
foo, bar, baz *int
|
||||
aFlag, bFlag *bool
|
||||
)
|
||||
|
||||
// Create a sub-command "a", which has a parameter "bar" specific to it.
|
||||
var bar *int
|
||||
ctx, aFlag := WithCLISubCommand(ctx, "a", "Description of a.",
|
||||
func(ctx context.Context) context.Context {
|
||||
ctx, bar = WithInt(ctx, "bar", 0, "Description of bar.")
|
||||
return ctx
|
||||
})
|
||||
// resetExample re-initializes all variables used in this example. We'll
|
||||
// call it multiple times to show different behaviors depending on what
|
||||
// arguments are passed in.
|
||||
resetExample := func() {
|
||||
// Create a new Component with a parameter "foo", which can be used across
|
||||
// all sub-commands.
|
||||
cmp = new(mcmp.Component)
|
||||
foo = Int(cmp, "foo")
|
||||
|
||||
// Create a sub-command "b", which has a parameter "baz" specific to it.
|
||||
var baz *int
|
||||
ctx, bFlag := WithCLISubCommand(ctx, "b", "Description of b.",
|
||||
func(ctx context.Context) context.Context {
|
||||
ctx, baz = WithInt(ctx, "baz", 0, "Description of baz.")
|
||||
return ctx
|
||||
})
|
||||
// Create a sub-command "a", which has a parameter "bar" specific to it.
|
||||
aFlag = CLISubCommand(cmp, "a", "Description of a.",
|
||||
func(cmp *mcmp.Component) {
|
||||
bar = Int(cmp, "bar")
|
||||
})
|
||||
|
||||
// Create a sub-command "b", which has a parameter "baz" specific to it.
|
||||
bFlag = CLISubCommand(cmp, "b", "Description of b.",
|
||||
func(cmp *mcmp.Component) {
|
||||
baz = Int(cmp, "baz")
|
||||
})
|
||||
}
|
||||
|
||||
// Use Populate with manually generated CLI arguments, calling the "a"
|
||||
// sub-command.
|
||||
resetExample()
|
||||
args := []string{"a", "--foo=1", "--bar=2"}
|
||||
if _, err := Populate(ctx, &SourceCLI{Args: args}); err != nil {
|
||||
if err := Populate(cmp, &SourceCLI{Args: args}); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
fmt.Printf("foo:%d bar:%d aFlag:%v bFlag:%v\n", *foo, *bar, *aFlag, *bFlag)
|
||||
|
||||
// reset output for another Populate, this time calling the "b" sub-command.
|
||||
*aFlag = false
|
||||
// reset for another Populate, this time calling the "b" sub-command.
|
||||
resetExample()
|
||||
args = []string{"b", "--foo=1", "--baz=3"}
|
||||
if _, err := Populate(ctx, &SourceCLI{Args: args}); err != nil {
|
||||
if err := Populate(cmp, &SourceCLI{Args: args}); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
fmt.Printf("foo:%d baz:%d aFlag:%v bFlag:%v\n", *foo, *baz, *aFlag, *bFlag)
|
||||
|
||||
28
mcfg/env.go
28
mcfg/env.go
@ -1,10 +1,10 @@
|
||||
package mcfg
|
||||
|
||||
import (
|
||||
"context"
|
||||
"os"
|
||||
"strings"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcmp"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
||||
"github.com/mediocregopher/mediocre-go-lib/merr"
|
||||
)
|
||||
@ -16,10 +16,10 @@ import (
|
||||
// underscores and making all characters uppercase, as well as changing all
|
||||
// dashes to underscores.
|
||||
//
|
||||
// ctx := mctx.New()
|
||||
// ctx = mctx.ChildOf(ctx, "foo")
|
||||
// ctx = mctx.ChildOf(ctx, "bar")
|
||||
// addr := mcfg.String(ctx, "srv-addr", "", "Some address")
|
||||
// cmp := new(mcmp.Component)
|
||||
// cmpFoo := cmp.Child("foo")
|
||||
// cmpFooBar := cmp.Child("bar")
|
||||
// addr := mcfg.String(cmpFooBar, "srv-addr", "", "Some address")
|
||||
// // the Env option to fill addr will be "FOO_BAR_SRV_ADDR"
|
||||
//
|
||||
type SourceEnv struct {
|
||||
@ -32,6 +32,8 @@ type SourceEnv struct {
|
||||
Prefix string
|
||||
}
|
||||
|
||||
var _ Source = new(SourceEnv)
|
||||
|
||||
func (env *SourceEnv) expectedName(path []string, name string) string {
|
||||
out := strings.Join(append(path, name), "_")
|
||||
if env.Prefix != "" {
|
||||
@ -42,17 +44,17 @@ func (env *SourceEnv) expectedName(path []string, name string) string {
|
||||
return out
|
||||
}
|
||||
|
||||
// Parse implements the method for the Source interface
|
||||
func (env *SourceEnv) Parse(ctx context.Context) (context.Context, []ParamValue, error) {
|
||||
// Parse implements the method for the Source interface.
|
||||
func (env *SourceEnv) Parse(cmp *mcmp.Component) ([]ParamValue, error) {
|
||||
kvs := env.Env
|
||||
if kvs == nil {
|
||||
kvs = os.Environ()
|
||||
}
|
||||
|
||||
params := CollectParams(ctx)
|
||||
params := CollectParams(cmp)
|
||||
pM := map[string]Param{}
|
||||
for _, p := range params {
|
||||
name := env.expectedName(mctx.Path(p.Context), p.Name)
|
||||
name := env.expectedName(p.Component.Path(), p.Name)
|
||||
pM[name] = p
|
||||
}
|
||||
|
||||
@ -60,18 +62,18 @@ func (env *SourceEnv) Parse(ctx context.Context) (context.Context, []ParamValue,
|
||||
for _, kv := range kvs {
|
||||
split := strings.SplitN(kv, "=", 2)
|
||||
if len(split) != 2 {
|
||||
ctx := mctx.Annotate(context.Background(), "kv", kv)
|
||||
return nil, nil, merr.New("malformed environment key/value pair", ctx)
|
||||
return nil, merr.New("malformed environment key/value pair",
|
||||
mctx.Annotated("kv", kv))
|
||||
}
|
||||
k, v := split[0], split[1]
|
||||
if p, ok := pM[k]; ok {
|
||||
pvs = append(pvs, ParamValue{
|
||||
Name: p.Name,
|
||||
Path: mctx.Path(p.Context),
|
||||
Path: p.Component.Path(),
|
||||
Value: p.fuzzyParse(v),
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
return ctx, pvs, nil
|
||||
return pvs, nil
|
||||
}
|
||||
|
||||
@ -36,9 +36,9 @@ func TestSourceEnv(t *T) {
|
||||
Apply: func(ss mchk.State, a mchk.Action) (mchk.State, error) {
|
||||
s := ss.(state)
|
||||
p := a.Params.(params)
|
||||
s.srcCommonState = s.srcCommonState.applyCtxAndPV(p.srcCommonParams)
|
||||
s.srcCommonState = s.srcCommonState.applyCmpAndPV(p.srcCommonParams)
|
||||
if !p.unset {
|
||||
kv := strings.Join(append(p.path, p.name), "_")
|
||||
kv := strings.Join(append(p.cmp.Path(), p.name), "_")
|
||||
kv = strings.Replace(kv, "-", "_", -1)
|
||||
kv = strings.ToUpper(kv)
|
||||
kv += "="
|
||||
|
||||
64
mcfg/mcfg.go
64
mcfg/mcfg.go
@ -2,21 +2,18 @@
|
||||
// parameters and various methods of filling those parameters from external
|
||||
// configuration sources (e.g. the command line and environment variables).
|
||||
//
|
||||
// Parameters are registered onto a context, and that same context is used later
|
||||
// to collect and fulfill those parameters. When used with the mctx package's
|
||||
// child/parent context functionality, the path of a context is incorporated
|
||||
// into the parameter's full name in order to namespace parameters which exist
|
||||
// in different contexts.
|
||||
// Parameters are registered onto a Component, and that same Component (or one
|
||||
// of its ancestors) is used later to collect and fill those parameters.
|
||||
package mcfg
|
||||
|
||||
import (
|
||||
"context"
|
||||
"crypto/md5"
|
||||
"encoding/hex"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"sort"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcmp"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
||||
"github.com/mediocregopher/mediocre-go-lib/merr"
|
||||
)
|
||||
@ -34,7 +31,7 @@ import (
|
||||
func sortParams(params []Param) {
|
||||
sort.Slice(params, func(i, j int) bool {
|
||||
a, b := params[i], params[j]
|
||||
aPath, bPath := mctx.Path(a.Context), mctx.Path(b.Context)
|
||||
aPath, bPath := a.Component.Path(), b.Component.Path()
|
||||
for {
|
||||
switch {
|
||||
case len(aPath) == 0 && len(bPath) == 0:
|
||||
@ -52,23 +49,23 @@ func sortParams(params []Param) {
|
||||
})
|
||||
}
|
||||
|
||||
// CollectParams gathers all Params by recursively retrieving them from this
|
||||
// Context and its children. Returned Params are sorted according to their Path
|
||||
// and Name.
|
||||
func CollectParams(ctx context.Context) []Param {
|
||||
// CollectParams gathers all Params by recursively retrieving them from the
|
||||
// given Component and its children. Returned Params are sorted according to
|
||||
// their Path and Name.
|
||||
func CollectParams(cmp *mcmp.Component) []Param {
|
||||
var params []Param
|
||||
|
||||
var visit func(context.Context)
|
||||
visit = func(ctx context.Context) {
|
||||
for _, param := range getLocalParams(ctx) {
|
||||
var visit func(*mcmp.Component)
|
||||
visit = func(cmp *mcmp.Component) {
|
||||
for _, param := range getLocalParams(cmp) {
|
||||
params = append(params, param)
|
||||
}
|
||||
|
||||
for _, childCtx := range mctx.Children(ctx) {
|
||||
visit(childCtx)
|
||||
for _, childCmp := range cmp.Children() {
|
||||
visit(childCmp)
|
||||
}
|
||||
}
|
||||
visit(ctx)
|
||||
visit(cmp)
|
||||
|
||||
sortParams(params)
|
||||
return params
|
||||
@ -86,34 +83,31 @@ func paramHash(path []string, name string) string {
|
||||
}
|
||||
|
||||
// Populate uses the Source to populate the values of all Params which were
|
||||
// added to the given Context, and all of its children. Populate may be called
|
||||
// multiple times with the same Context, each time will only affect the values
|
||||
// added to the given Component, and all of its children. Populate may be called
|
||||
// multiple times with the same Component, each time will only affect the values
|
||||
// of the Params which were provided by the respective Source.
|
||||
//
|
||||
// Populating Params can affect the Context itself, for example in the case of
|
||||
// sub-commands. For this reason Populate will return a Context instance which
|
||||
// may have been affected by the Params (or, if not, will be the same one which
|
||||
// was passed in).
|
||||
//
|
||||
// Source may be nil to indicate that no configuration is provided. Only default
|
||||
// values will be used, and if any parameters are required this will error.
|
||||
func Populate(ctx context.Context, src Source) (context.Context, error) {
|
||||
//
|
||||
// Populating Params can affect the Component itself, for example in the case of
|
||||
// sub-commands.
|
||||
func Populate(cmp *mcmp.Component, src Source) error {
|
||||
if src == nil {
|
||||
src = ParamValues(nil)
|
||||
}
|
||||
ogCtx := ctx
|
||||
|
||||
ctx, pvs, err := src.Parse(ctx)
|
||||
pvs, err := src.Parse(cmp)
|
||||
if err != nil {
|
||||
return ogCtx, err
|
||||
return err
|
||||
}
|
||||
|
||||
// map Params to their hash, so we can match them to their ParamValues.
|
||||
// later. There should not be any duplicates here.
|
||||
params := CollectParams(ctx)
|
||||
params := CollectParams(cmp)
|
||||
pM := map[string]Param{}
|
||||
for _, p := range params {
|
||||
path := mctx.Path(p.Context)
|
||||
path := p.Component.Path()
|
||||
hash := paramHash(path, p.Name)
|
||||
if _, ok := pM[hash]; ok {
|
||||
panic("duplicate Param: " + paramFullName(path, p.Name))
|
||||
@ -137,9 +131,9 @@ func Populate(ctx context.Context, src Source) (context.Context, error) {
|
||||
if !p.Required {
|
||||
continue
|
||||
} else if _, ok := pvM[hash]; !ok {
|
||||
ctx := mctx.Annotate(p.Context,
|
||||
"param", paramFullName(mctx.Path(p.Context), p.Name))
|
||||
return ogCtx, merr.New("required parameter is not set", ctx)
|
||||
ctx := mctx.Annotate(p.Component.Annotated(),
|
||||
"param", paramFullName(p.Component.Path(), p.Name))
|
||||
return merr.New("required parameter is not set", ctx)
|
||||
}
|
||||
}
|
||||
|
||||
@ -148,9 +142,9 @@ func Populate(ctx context.Context, src Source) (context.Context, error) {
|
||||
// at this point, all ParamValues in pvM have a corresponding pM Param
|
||||
p := pM[hash]
|
||||
if err := json.Unmarshal(pv.Value, p.Into); err != nil {
|
||||
return ogCtx, err
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
return ctx, nil
|
||||
return nil
|
||||
}
|
||||
|
||||
@ -1,45 +1,44 @@
|
||||
package mcfg
|
||||
|
||||
import (
|
||||
"context"
|
||||
. "testing"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcmp"
|
||||
"github.com/stretchr/testify/assert"
|
||||
)
|
||||
|
||||
func TestPopulate(t *T) {
|
||||
{
|
||||
ctx := context.Background()
|
||||
ctx, a := WithInt(ctx, "a", 0, "")
|
||||
ctxChild := mctx.NewChild(ctx, "foo")
|
||||
ctxChild, b := WithInt(ctxChild, "b", 0, "")
|
||||
ctxChild, c := WithInt(ctxChild, "c", 0, "")
|
||||
ctx = mctx.WithChild(ctx, ctxChild)
|
||||
cmp := new(mcmp.Component)
|
||||
a := Int(cmp, "a")
|
||||
cmpFoo := cmp.Child("foo")
|
||||
b := Int(cmpFoo, "b")
|
||||
c := Int(cmpFoo, "c")
|
||||
d := Int(cmp, "d", ParamDefault(4))
|
||||
|
||||
_, err := Populate(ctx, &SourceCLI{
|
||||
err := Populate(cmp, &SourceCLI{
|
||||
Args: []string{"--a=1", "--foo-b=2"},
|
||||
})
|
||||
assert.NoError(t, err)
|
||||
assert.Equal(t, 1, *a)
|
||||
assert.Equal(t, 2, *b)
|
||||
assert.Equal(t, 0, *c)
|
||||
assert.Equal(t, 4, *d)
|
||||
}
|
||||
|
||||
{ // test that required params are enforced
|
||||
ctx := context.Background()
|
||||
ctx, a := WithInt(ctx, "a", 0, "")
|
||||
ctxChild := mctx.NewChild(ctx, "foo")
|
||||
ctxChild, b := WithInt(ctxChild, "b", 0, "")
|
||||
ctxChild, c := WithRequiredInt(ctxChild, "c", "")
|
||||
ctx = mctx.WithChild(ctx, ctxChild)
|
||||
cmp := new(mcmp.Component)
|
||||
a := Int(cmp, "a")
|
||||
cmpFoo := cmp.Child("foo")
|
||||
b := Int(cmpFoo, "b")
|
||||
c := Int(cmpFoo, "c", ParamRequired())
|
||||
|
||||
_, err := Populate(ctx, &SourceCLI{
|
||||
err := Populate(cmp, &SourceCLI{
|
||||
Args: []string{"--a=1", "--foo-b=2"},
|
||||
})
|
||||
assert.Error(t, err)
|
||||
|
||||
_, err = Populate(ctx, &SourceCLI{
|
||||
err = Populate(cmp, &SourceCLI{
|
||||
Args: []string{"--a=1", "--foo-b=2", "--foo-c=3"},
|
||||
})
|
||||
assert.NoError(t, err)
|
||||
|
||||
252
mcfg/param.go
252
mcfg/param.go
@ -1,26 +1,25 @@
|
||||
package mcfg
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"reflect"
|
||||
"strings"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcmp"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mtime"
|
||||
)
|
||||
|
||||
// Param is a configuration parameter which can be populated by Populate. The
|
||||
// Param will exist as part of a Context, relative to its path (see the mctx
|
||||
// package for more on Context path). For example, a Param with name "addr"
|
||||
// under a Context with path of []string{"foo","bar"} will be setable on the CLI
|
||||
// via "--foo-bar-addr". Other configuration Sources may treat the path/name
|
||||
// differently, however.
|
||||
// Param will exist as part of a Component. For example, a Param with name
|
||||
// "addr" under a Component with path of []string{"foo","bar"} will be setable
|
||||
// on the CLI via "--foo-bar-addr". Other configuration Sources may treat the
|
||||
// path/name differently, however.
|
||||
//
|
||||
// Param values are always unmarshaled as JSON values into the Into field of the
|
||||
// Param, regardless of the actual Source.
|
||||
type Param struct {
|
||||
// How the parameter will be identified within a Context.
|
||||
// How the parameter will be identified within a Component.
|
||||
Name string
|
||||
|
||||
// A helpful description of how a parameter is expected to be used.
|
||||
@ -44,9 +43,59 @@ type Param struct {
|
||||
// value of the parameter.
|
||||
Into interface{}
|
||||
|
||||
// The Context this Param was added to. NOTE that this will be automatically
|
||||
// filled in by WithParam when the Param is added to the Context.
|
||||
Context context.Context
|
||||
// The Component this Param was added to. NOTE that this will be
|
||||
// automatically filled in by AddParam when the Param is added to the
|
||||
// Component.
|
||||
Component *mcmp.Component
|
||||
}
|
||||
|
||||
// ParamOption is a modifier which can be passed into most Param-generating
|
||||
// functions (e.g. String, Int, etc...)
|
||||
type ParamOption func(*Param)
|
||||
|
||||
// ParamRequired returns a ParamOption which ensures the parameter is required
|
||||
// to be set by some configuration source. The default value of the parameter
|
||||
// will be ignored.
|
||||
func ParamRequired() ParamOption {
|
||||
return func(param *Param) {
|
||||
param.Required = true
|
||||
}
|
||||
}
|
||||
|
||||
// ParamDefault returns a ParamOption which ensures the parameter uses the given
|
||||
// default value when no Sources set a value for it. If not given then mcfg will
|
||||
// use the zero value of the Param's type as the default value.
|
||||
//
|
||||
// If ParamRequired is given then this does nothing.
|
||||
func ParamDefault(value interface{}) ParamOption {
|
||||
return func(param *Param) {
|
||||
intoV := reflect.ValueOf(param.Into).Elem()
|
||||
valueV := reflect.ValueOf(value)
|
||||
|
||||
intoType, valueType := intoV.Type(), valueV.Type()
|
||||
if intoType != valueType {
|
||||
panic(fmt.Sprintf("ParamDefault value is type %s, but should be %s", valueType, intoType))
|
||||
} else if !intoV.CanSet() {
|
||||
panic(fmt.Sprintf("Param.Into value %#v can't be set using reflection", param.Into))
|
||||
}
|
||||
|
||||
intoV.Set(valueV)
|
||||
}
|
||||
}
|
||||
|
||||
// ParamUsage returns a ParamOption which sets the usage string on the Param.
|
||||
// This is used in some Sources, like SourceCLI, when displaying information
|
||||
// about available parameters.
|
||||
func ParamUsage(usage string) ParamOption {
|
||||
// make all usages end with a period, because I say so
|
||||
usage = strings.TrimSpace(usage)
|
||||
if !strings.HasSuffix(usage, ".") {
|
||||
usage += "."
|
||||
}
|
||||
|
||||
return func(param *Param) {
|
||||
param.Usage = usage
|
||||
}
|
||||
}
|
||||
|
||||
func paramFullName(path []string, name string) string {
|
||||
@ -67,31 +116,36 @@ func (p Param) fuzzyParse(v string) json.RawMessage {
|
||||
return json.RawMessage(v)
|
||||
}
|
||||
|
||||
type ctxKey string
|
||||
type cmpParamKey string
|
||||
|
||||
func getParam(ctx context.Context, name string) (Param, bool) {
|
||||
param, ok := mctx.LocalValue(ctx, ctxKey(name)).(Param)
|
||||
// used in tests
|
||||
func getParam(cmp *mcmp.Component, name string) (Param, bool) {
|
||||
param, ok := cmp.Value(cmpParamKey(name)).(Param)
|
||||
return param, ok
|
||||
}
|
||||
|
||||
// WithParam returns a Context with the given Param added to it. It will panic
|
||||
// if a Param with the same Name already exists in the Context.
|
||||
func WithParam(ctx context.Context, param Param) context.Context {
|
||||
// AddParam adds the given Param to the given Component. It will panic if a
|
||||
// Param with the same Name already exists in the Component.
|
||||
func AddParam(cmp *mcmp.Component, param Param, opts ...ParamOption) {
|
||||
param.Name = strings.ToLower(param.Name)
|
||||
param.Context = ctx
|
||||
param.Component = cmp
|
||||
key := cmpParamKey(param.Name)
|
||||
|
||||
if _, ok := getParam(ctx, param.Name); ok {
|
||||
path := mctx.Path(ctx)
|
||||
panic(fmt.Sprintf("Context Path:%#v Name:%q already exists", path, param.Name))
|
||||
if cmp.HasValue(key) {
|
||||
path := cmp.Path()
|
||||
panic(fmt.Sprintf("Component.Path:%#v Param.Name:%q already exists", path, param.Name))
|
||||
}
|
||||
|
||||
return mctx.WithLocalValue(ctx, ctxKey(param.Name), param)
|
||||
for _, opt := range opts {
|
||||
opt(¶m)
|
||||
}
|
||||
cmp.SetValue(key, param)
|
||||
}
|
||||
|
||||
func getLocalParams(ctx context.Context) []Param {
|
||||
localVals := mctx.LocalValues(ctx)
|
||||
params := make([]Param, 0, len(localVals))
|
||||
for _, val := range localVals {
|
||||
func getLocalParams(cmp *mcmp.Component) []Param {
|
||||
values := cmp.Values()
|
||||
params := make([]Param, 0, len(values))
|
||||
for _, val := range values {
|
||||
if param, ok := val.(Param); ok {
|
||||
params = append(params, param)
|
||||
}
|
||||
@ -99,131 +153,73 @@ func getLocalParams(ctx context.Context) []Param {
|
||||
return params
|
||||
}
|
||||
|
||||
// WithInt64 returns an *int64 which will be populated once Populate is run on
|
||||
// the returned Context.
|
||||
func WithInt64(ctx context.Context, name string, defaultVal int64, usage string) (context.Context, *int64) {
|
||||
i := defaultVal
|
||||
ctx = WithParam(ctx, Param{Name: name, Usage: usage, Into: &i})
|
||||
return ctx, &i
|
||||
}
|
||||
|
||||
// WithRequiredInt64 returns an *int64 which will be populated once Populate is
|
||||
// run on the returned Context, and which must be supplied by a configuration
|
||||
// Source.
|
||||
func WithRequiredInt64(ctx context.Context, name string, usage string) (context.Context, *int64) {
|
||||
// Int64 returns an *int64 which will be populated once Populate is run on the
|
||||
// Component.
|
||||
func Int64(cmp *mcmp.Component, name string, opts ...ParamOption) *int64 {
|
||||
var i int64
|
||||
ctx = WithParam(ctx, Param{Name: name, Required: true, Usage: usage, Into: &i})
|
||||
return ctx, &i
|
||||
AddParam(cmp, Param{Name: name, Into: &i}, opts...)
|
||||
return &i
|
||||
}
|
||||
|
||||
// WithInt returns an *int which will be populated once Populate is run on the
|
||||
// returned Context.
|
||||
func WithInt(ctx context.Context, name string, defaultVal int, usage string) (context.Context, *int) {
|
||||
i := defaultVal
|
||||
ctx = WithParam(ctx, Param{Name: name, Usage: usage, Into: &i})
|
||||
return ctx, &i
|
||||
}
|
||||
|
||||
// WithRequiredInt returns an *int which will be populated once Populate is run
|
||||
// on the returned Context, and which must be supplied by a configuration
|
||||
// Source.
|
||||
func WithRequiredInt(ctx context.Context, name string, usage string) (context.Context, *int) {
|
||||
// Int returns an *int which will be populated once Populate is run on the
|
||||
// Component.
|
||||
func Int(cmp *mcmp.Component, name string, opts ...ParamOption) *int {
|
||||
var i int
|
||||
ctx = WithParam(ctx, Param{Name: name, Required: true, Usage: usage, Into: &i})
|
||||
return ctx, &i
|
||||
AddParam(cmp, Param{Name: name, Into: &i}, opts...)
|
||||
return &i
|
||||
}
|
||||
|
||||
// WithFloat64 returns a *float64 which will be populated once Populate is run on
|
||||
// the returned Context.
|
||||
func WithFloat64(ctx context.Context, name string, defaultVal float64, usage string) (context.Context, *float64) {
|
||||
f := defaultVal
|
||||
ctx = WithParam(ctx, Param{Name: name, Usage: usage, Into: &f})
|
||||
return ctx, &f
|
||||
// Float64 returns a *float64 which will be populated once Populate is run on
|
||||
// the Component
|
||||
func Float64(cmp *mcmp.Component, name string, opts ...ParamOption) *float64 {
|
||||
var f float64
|
||||
AddParam(cmp, Param{Name: name, Into: &f}, opts...)
|
||||
return &f
|
||||
}
|
||||
|
||||
// WithRequiredFloat64 returns a *float64 which will be populated once Populate
|
||||
// is run on the returned Context, and which must be supplied by a configuration
|
||||
// Source.
|
||||
func WithRequiredFloat64(ctx context.Context, name string, defaultVal float64, usage string) (context.Context, *float64) {
|
||||
f := defaultVal
|
||||
ctx = WithParam(ctx, Param{Name: name, Required: true, Usage: usage, Into: &f})
|
||||
return ctx, &f
|
||||
}
|
||||
|
||||
// WithString returns a *string which will be populated once Populate is run on
|
||||
// the returned Context.
|
||||
func WithString(ctx context.Context, name, defaultVal, usage string) (context.Context, *string) {
|
||||
s := defaultVal
|
||||
ctx = WithParam(ctx, Param{Name: name, Usage: usage, IsString: true, Into: &s})
|
||||
return ctx, &s
|
||||
}
|
||||
|
||||
// WithRequiredString returns a *string which will be populated once Populate is
|
||||
// run on the returned Context, and which must be supplied by a configuration
|
||||
// Source.
|
||||
func WithRequiredString(ctx context.Context, name, usage string) (context.Context, *string) {
|
||||
// String returns a *string which will be populated once Populate is run on
|
||||
// the Component.
|
||||
func String(cmp *mcmp.Component, name string, opts ...ParamOption) *string {
|
||||
var s string
|
||||
ctx = WithParam(ctx, Param{Name: name, Required: true, Usage: usage, IsString: true, Into: &s})
|
||||
return ctx, &s
|
||||
AddParam(cmp, Param{Name: name, IsString: true, Into: &s}, opts...)
|
||||
return &s
|
||||
}
|
||||
|
||||
// WithBool returns a *bool which will be populated once Populate is run on the
|
||||
// returned Context, and which defaults to false if unconfigured.
|
||||
// Bool returns a *bool which will be populated once Populate is run on the
|
||||
// Component, and which defaults to false if unconfigured.
|
||||
//
|
||||
// The default behavior of all Sources is that a boolean parameter will be set
|
||||
// to true unless the value is "", 0, or false. In the case of the CLI Source
|
||||
// the value will also be true when the parameter is used with no value at all,
|
||||
// as would be expected.
|
||||
func WithBool(ctx context.Context, name, usage string) (context.Context, *bool) {
|
||||
func Bool(cmp *mcmp.Component, name string, opts ...ParamOption) *bool {
|
||||
var b bool
|
||||
ctx = WithParam(ctx, Param{Name: name, Usage: usage, IsBool: true, Into: &b})
|
||||
return ctx, &b
|
||||
AddParam(cmp, Param{Name: name, IsBool: true, Into: &b}, opts...)
|
||||
return &b
|
||||
}
|
||||
|
||||
// WithTS returns an *mtime.TS which will be populated once Populate is run on
|
||||
// the returned Context.
|
||||
func WithTS(ctx context.Context, name string, defaultVal mtime.TS, usage string) (context.Context, *mtime.TS) {
|
||||
t := defaultVal
|
||||
ctx = WithParam(ctx, Param{Name: name, Usage: usage, Into: &t})
|
||||
return ctx, &t
|
||||
}
|
||||
|
||||
// WithRequiredTS returns an *mtime.TS which will be populated once Populate is
|
||||
// run on the returned Context, and which must be supplied by a configuration
|
||||
// Source.
|
||||
func WithRequiredTS(ctx context.Context, name, usage string) (context.Context, *mtime.TS) {
|
||||
// TS returns an *mtime.TS which will be populated once Populate is run on
|
||||
// the Component.
|
||||
func TS(cmp *mcmp.Component, name string, opts ...ParamOption) *mtime.TS {
|
||||
var t mtime.TS
|
||||
ctx = WithParam(ctx, Param{Name: name, Required: true, Usage: usage, Into: &t})
|
||||
return ctx, &t
|
||||
AddParam(cmp, Param{Name: name, Into: &t}, opts...)
|
||||
return &t
|
||||
}
|
||||
|
||||
// WithDuration returns an *mtime.Duration which will be populated once Populate
|
||||
// is run on the returned Context.
|
||||
func WithDuration(ctx context.Context, name string, defaultVal mtime.Duration, usage string) (context.Context, *mtime.Duration) {
|
||||
d := defaultVal
|
||||
ctx = WithParam(ctx, Param{Name: name, Usage: usage, IsString: true, Into: &d})
|
||||
return ctx, &d
|
||||
}
|
||||
|
||||
// WithRequiredDuration returns an *mtime.Duration which will be populated once
|
||||
// Populate is run on the returned Context, and which must be supplied by a
|
||||
// configuration Source.
|
||||
func WithRequiredDuration(ctx context.Context, name string, defaultVal mtime.Duration, usage string) (context.Context, *mtime.Duration) {
|
||||
// Duration returns an *mtime.Duration which will be populated once Populate
|
||||
// is run on the Component.
|
||||
func Duration(cmp *mcmp.Component, name string, opts ...ParamOption) *mtime.Duration {
|
||||
var d mtime.Duration
|
||||
ctx = WithParam(ctx, Param{Name: name, Required: true, Usage: usage, IsString: true, Into: &d})
|
||||
return ctx, &d
|
||||
AddParam(cmp, Param{Name: name, IsString: true, Into: &d}, opts...)
|
||||
return &d
|
||||
}
|
||||
|
||||
// WithJSON reads the parameter value as a JSON value and unmarshals it into the
|
||||
// given interface{} (which should be a pointer). The receiver (into) is also
|
||||
// used to determine the default value.
|
||||
func WithJSON(ctx context.Context, name string, into interface{}, usage string) context.Context {
|
||||
return WithParam(ctx, Param{Name: name, Usage: usage, Into: into})
|
||||
}
|
||||
|
||||
// WithRequiredJSON reads the parameter value as a JSON value and unmarshals it
|
||||
// into the given interface{} (which should be a pointer). The value must be
|
||||
// supplied by a configuration Source.
|
||||
func WithRequiredJSON(ctx context.Context, name string, into interface{}, usage string) context.Context {
|
||||
return WithParam(ctx, Param{Name: name, Required: true, Usage: usage, Into: into})
|
||||
// JSON reads the parameter value as a JSON value and unmarshals it into the
|
||||
// given interface{} (which should be a pointer) once Populate is run on the
|
||||
// Component.
|
||||
//
|
||||
// The receiver (into) is also used to determine the default value. ParamDefault
|
||||
// should not be used as one of the opts.
|
||||
func JSON(cmp *mcmp.Component, name string, into interface{}, opts ...ParamOption) {
|
||||
AddParam(cmp, Param{Name: name, Into: into}, opts...)
|
||||
}
|
||||
|
||||
@ -1,8 +1,9 @@
|
||||
package mcfg
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/json"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcmp"
|
||||
)
|
||||
|
||||
// ParamValue describes a value for a parameter which has been parsed by a
|
||||
@ -14,31 +15,32 @@ type ParamValue struct {
|
||||
}
|
||||
|
||||
// Source parses ParamValues out of a particular configuration source, given the
|
||||
// Context which the Params were added to (via WithInt, WithString, etc...).
|
||||
// Component which the Params were added to (via WithInt, WithString, etc...).
|
||||
// CollectParams can be used to retrieve these Params.
|
||||
//
|
||||
// It's possible for Parsing to affect the Context itself, for example in the
|
||||
// case of sub-commands. For this reason Parse can return a Context, which will
|
||||
// get used for subsequent Parse commands inside Populate.
|
||||
// It's possible for Parsing to affect the Component itself, for example in the
|
||||
// case of sub-commands.
|
||||
//
|
||||
// Source should not return ParamValues which were not explicitly set to a value
|
||||
// by the configuration source.
|
||||
//
|
||||
// The returned []ParamValue may contain duplicates of the same Param's value.
|
||||
// in which case the later value takes precedence. It may also contain
|
||||
// in which case the latter value takes precedence. It may also contain
|
||||
// ParamValues which do not correspond to any of the passed in Params. These
|
||||
// will be ignored in Populate.
|
||||
type Source interface {
|
||||
Parse(context.Context) (context.Context, []ParamValue, error)
|
||||
Parse(*mcmp.Component) ([]ParamValue, error)
|
||||
}
|
||||
|
||||
// ParamValues is simply a slice of ParamValue elements, which implements Parse
|
||||
// by always returning itself as-is.
|
||||
type ParamValues []ParamValue
|
||||
|
||||
var _ Source = ParamValues{}
|
||||
|
||||
// Parse implements the method for the Source interface.
|
||||
func (pvs ParamValues) Parse(ctx context.Context) (context.Context, []ParamValue, error) {
|
||||
return ctx, pvs, nil
|
||||
func (pvs ParamValues) Parse(*mcmp.Component) ([]ParamValue, error) {
|
||||
return pvs, nil
|
||||
}
|
||||
|
||||
// Sources combines together multiple Source instances into one. It will call
|
||||
@ -46,16 +48,18 @@ func (pvs ParamValues) Parse(ctx context.Context) (context.Context, []ParamValue
|
||||
// over previous ones.
|
||||
type Sources []Source
|
||||
|
||||
var _ Source = Sources{}
|
||||
|
||||
// Parse implements the method for the Source interface.
|
||||
func (ss Sources) Parse(ctx context.Context) (context.Context, []ParamValue, error) {
|
||||
func (ss Sources) Parse(cmp *mcmp.Component) ([]ParamValue, error) {
|
||||
var pvs []ParamValue
|
||||
for _, s := range ss {
|
||||
var innerPVs []ParamValue
|
||||
var err error
|
||||
if ctx, innerPVs, err = s.Parse(ctx); err != nil {
|
||||
return nil, nil, err
|
||||
if innerPVs, err = s.Parse(cmp); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
pvs = append(pvs, innerPVs...)
|
||||
}
|
||||
return ctx, pvs, nil
|
||||
return pvs, nil
|
||||
}
|
||||
|
||||
@ -1,13 +1,12 @@
|
||||
package mcfg
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
. "testing"
|
||||
"time"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcmp"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mrand"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mtest/massert"
|
||||
)
|
||||
@ -17,10 +16,9 @@ import (
|
||||
// all the code they share
|
||||
|
||||
type srcCommonState struct {
|
||||
// availCtxs get updated in place as the run goes on, and mkRoot is used to
|
||||
// create the latest version of the root context based on them
|
||||
availCtxs []*context.Context
|
||||
mkRoot func() context.Context
|
||||
// availCmps get updated in place as the run goes on, it's easier to keep
|
||||
// track of them this way than by traversing the hierarchy.
|
||||
availCmps []*mcmp.Component
|
||||
|
||||
expPVs []ParamValue
|
||||
// each specific test should wrap this to add the Source itself
|
||||
@ -29,31 +27,21 @@ type srcCommonState struct {
|
||||
func newSrcCommonState() srcCommonState {
|
||||
var scs srcCommonState
|
||||
{
|
||||
root := context.Background()
|
||||
a := mctx.NewChild(root, "a")
|
||||
b := mctx.NewChild(root, "b")
|
||||
c := mctx.NewChild(root, "c")
|
||||
ab := mctx.NewChild(a, "b")
|
||||
bc := mctx.NewChild(b, "c")
|
||||
abc := mctx.NewChild(ab, "c")
|
||||
scs.availCtxs = []*context.Context{&root, &a, &b, &c, &ab, &bc, &abc}
|
||||
scs.mkRoot = func() context.Context {
|
||||
ab := mctx.WithChild(ab, abc)
|
||||
a := mctx.WithChild(a, ab)
|
||||
b := mctx.WithChild(b, bc)
|
||||
root := mctx.WithChild(root, a)
|
||||
root = mctx.WithChild(root, b)
|
||||
root = mctx.WithChild(root, c)
|
||||
return root
|
||||
}
|
||||
root := new(mcmp.Component)
|
||||
a := root.Child("a")
|
||||
b := root.Child("b")
|
||||
c := root.Child("c")
|
||||
ab := a.Child("b")
|
||||
bc := b.Child("c")
|
||||
abc := ab.Child("c")
|
||||
scs.availCmps = []*mcmp.Component{root, a, b, c, ab, bc, abc}
|
||||
}
|
||||
return scs
|
||||
}
|
||||
|
||||
type srcCommonParams struct {
|
||||
name string
|
||||
availCtxI int // not technically needed, but makes finding the ctx easier
|
||||
path []string
|
||||
cmp *mcmp.Component
|
||||
isBool bool
|
||||
nonBoolType string // "int", "str", "duration", "json"
|
||||
unset bool
|
||||
@ -68,8 +56,8 @@ func (scs srcCommonState) next() srcCommonParams {
|
||||
p.name = mrand.Hex(8)
|
||||
}
|
||||
|
||||
p.availCtxI = mrand.Intn(len(scs.availCtxs))
|
||||
p.path = mctx.Path(*scs.availCtxs[p.availCtxI])
|
||||
availCmpI := mrand.Intn(len(scs.availCmps))
|
||||
p.cmp = scs.availCmps[availCmpI]
|
||||
|
||||
p.isBool = mrand.Intn(8) == 0
|
||||
if !p.isBool {
|
||||
@ -105,22 +93,21 @@ func (scs srcCommonState) next() srcCommonParams {
|
||||
return p
|
||||
}
|
||||
|
||||
// adds the new param to the ctx, and if the param is expected to be set in
|
||||
// adds the new param to the cmp, and if the param is expected to be set in
|
||||
// the Source adds it to the expected ParamValues as well
|
||||
func (scs srcCommonState) applyCtxAndPV(p srcCommonParams) srcCommonState {
|
||||
thisCtx := scs.availCtxs[p.availCtxI]
|
||||
ctxP := Param{
|
||||
func (scs srcCommonState) applyCmpAndPV(p srcCommonParams) srcCommonState {
|
||||
param := Param{
|
||||
Name: p.name,
|
||||
IsString: p.nonBoolType == "str" || p.nonBoolType == "duration",
|
||||
IsBool: p.isBool,
|
||||
// the Sources don't actually care about the other fields of Param,
|
||||
// those are only used by Populate once it has all ParamValues together
|
||||
}
|
||||
*thisCtx = WithParam(*thisCtx, ctxP)
|
||||
ctxP, _ = getParam(*thisCtx, ctxP.Name) // get it back out to get any added fields
|
||||
AddParam(p.cmp, param)
|
||||
param, _ = getParam(p.cmp, param.Name) // get it back out to get any added fields
|
||||
|
||||
if !p.unset {
|
||||
pv := ParamValue{Name: ctxP.Name, Path: mctx.Path(ctxP.Context)}
|
||||
pv := ParamValue{Name: param.Name, Path: p.cmp.Path()}
|
||||
if p.isBool {
|
||||
pv.Value = json.RawMessage("true")
|
||||
} else {
|
||||
@ -142,8 +129,7 @@ func (scs srcCommonState) applyCtxAndPV(p srcCommonParams) srcCommonState {
|
||||
// given a Source asserts that it's Parse method returns the expected
|
||||
// ParamValues
|
||||
func (scs srcCommonState) assert(s Source) error {
|
||||
root := scs.mkRoot()
|
||||
_, gotPVs, err := s.Parse(root)
|
||||
gotPVs, err := s.Parse(scs.availCmps[0]) // Parse(root)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
@ -154,12 +140,12 @@ func (scs srcCommonState) assert(s Source) error {
|
||||
}
|
||||
|
||||
func TestSources(t *T) {
|
||||
ctx := context.Background()
|
||||
ctx, a := WithRequiredInt(ctx, "a", "")
|
||||
ctx, b := WithRequiredInt(ctx, "b", "")
|
||||
ctx, c := WithRequiredInt(ctx, "c", "")
|
||||
cmp := new(mcmp.Component)
|
||||
a := Int(cmp, "a", ParamRequired())
|
||||
b := Int(cmp, "b", ParamRequired())
|
||||
c := Int(cmp, "c", ParamRequired())
|
||||
|
||||
_, err := Populate(ctx, Sources{
|
||||
err := Populate(cmp, Sources{
|
||||
&SourceCLI{Args: []string{"--a=1", "--b=666"}},
|
||||
&SourceEnv{Env: []string{"B=2", "C=3"}},
|
||||
})
|
||||
@ -172,14 +158,13 @@ func TestSources(t *T) {
|
||||
}
|
||||
|
||||
func TestSourceParamValues(t *T) {
|
||||
ctx := context.Background()
|
||||
ctx, a := WithRequiredInt(ctx, "a", "")
|
||||
foo := mctx.NewChild(ctx, "foo")
|
||||
foo, b := WithRequiredString(foo, "b", "")
|
||||
foo, c := WithBool(foo, "c", "")
|
||||
ctx = mctx.WithChild(ctx, foo)
|
||||
cmp := new(mcmp.Component)
|
||||
a := Int(cmp, "a", ParamRequired())
|
||||
cmpFoo := cmp.Child("foo")
|
||||
b := String(cmpFoo, "b", ParamRequired())
|
||||
c := Bool(cmpFoo, "c")
|
||||
|
||||
_, err := Populate(ctx, ParamValues{
|
||||
err := Populate(cmp, ParamValues{
|
||||
{Name: "a", Value: json.RawMessage(`4`)},
|
||||
{Path: []string{"foo"}, Name: "b", Value: json.RawMessage(`"bbb"`)},
|
||||
{Path: []string{"foo"}, Name: "c", Value: json.RawMessage("true")},
|
||||
|
||||
Loading…
Reference in New Issue
Block a user