m: refactor to use new Component stuff, and make the log logic a bit better
This commit is contained in:
Brian Picciano
parent
e741e79acf
commit
e91ef01857
153
m/m.go
153
m/m.go
@ -1,130 +1,151 @@
|
||||
// Package m is the glue which holds all the other packages in this project
|
||||
// together. While other packages in this project are intended to be able to be
|
||||
// used separately and largely independently, this package combines them in ways
|
||||
// which I specifically like.
|
||||
// Package m implements functionality specific to how I like my programs to
|
||||
// work. It acts as glue between many of the other packages in this framework,
|
||||
// putting them together in the way I find most useful.
|
||||
package m
|
||||
|
||||
import (
|
||||
"context"
|
||||
"os"
|
||||
"os/signal"
|
||||
"time"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcfg"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcmp"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
||||
"github.com/mediocregopher/mediocre-go-lib/merr"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mlog"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mrun"
|
||||
)
|
||||
|
||||
type ctxKey int
|
||||
type cmpKey int
|
||||
|
||||
const (
|
||||
ctxKeyCfgSrc ctxKey = iota
|
||||
ctxKeyInfoLog
|
||||
cmpKeyCfgSrc cmpKey = iota
|
||||
cmpKeyInfoLog
|
||||
)
|
||||
|
||||
func debugLog(msg string, ctxs ...context.Context) {
|
||||
fn := mlog.Debug
|
||||
func debugLog(cmp *mcmp.Component, msg string, ctxs ...context.Context) {
|
||||
level := mlog.DebugLevel
|
||||
if len(ctxs) > 0 {
|
||||
if ok, _ := ctxs[0].Value(ctxKeyInfoLog).(bool); ok {
|
||||
fn = mlog.Info
|
||||
if ok, _ := ctxs[0].Value(cmpKeyInfoLog).(bool); ok {
|
||||
level = mlog.InfoLevel
|
||||
}
|
||||
}
|
||||
fn(msg, ctxs...)
|
||||
}
|
||||
|
||||
// ProcessContext returns a Context which should be used as the root Context
|
||||
// when implementing most processes.
|
||||
mlog.From(cmp).Log(mlog.Message{
|
||||
Level: level,
|
||||
Description: msg,
|
||||
Contexts: ctxs,
|
||||
})
|
||||
}
|
||||
|
||||
// RootComponent returns a Component which should be used as the root Component
|
||||
// when implementing most programs.
|
||||
//
|
||||
// The returned Context will automatically handle setting up global
|
||||
// configuration parameters like "log-level", as well as an http endpoint where
|
||||
// debug information about the running process can be accessed.
|
||||
func ProcessContext() context.Context {
|
||||
ctx := context.Background()
|
||||
// The returned Component will automatically handle setting up global
|
||||
// configuration parameters like "log-level", as well as parsing those
|
||||
// and all other parameters when the Init even is triggered on it.
|
||||
func RootComponent() *mcmp.Component {
|
||||
cmp := new(mcmp.Component)
|
||||
|
||||
// embed confuration source which should be used into the context.
|
||||
ctx = context.WithValue(ctx, ctxKeyCfgSrc, mcfg.Source(new(mcfg.SourceCLI)))
|
||||
cmp.SetValue(cmpKeyCfgSrc, mcfg.Source(new(mcfg.SourceCLI)))
|
||||
|
||||
// set up log level handling
|
||||
logger := mlog.NewLogger()
|
||||
ctx = mlog.WithLogger(ctx, logger)
|
||||
ctx, logLevelStr := mcfg.WithString(ctx, "log-level", "info", "Maximum log level which will be printed.")
|
||||
ctx = mrun.WithStartHook(ctx, func(context.Context) error {
|
||||
mlog.SetLogger(cmp, logger)
|
||||
|
||||
// set up parameter parsing
|
||||
mrun.InitHook(cmp, func(context.Context) error {
|
||||
src, _ := cmp.Value(cmpKeyCfgSrc).(mcfg.Source)
|
||||
if src == nil {
|
||||
return merr.New("Component not sourced from m package", cmp.Context())
|
||||
} else if err := mcfg.Populate(cmp, src); err != nil {
|
||||
return merr.Wrap(err, cmp.Context())
|
||||
}
|
||||
return nil
|
||||
})
|
||||
|
||||
logLevelStr := mcfg.String(cmp, "log-level",
|
||||
mcfg.ParamDefault("info"),
|
||||
mcfg.ParamUsage("Maximum log level which will be printed."))
|
||||
mrun.InitHook(cmp, func(context.Context) error {
|
||||
logLevel := mlog.LevelFromString(*logLevelStr)
|
||||
if logLevel == nil {
|
||||
ctx := mctx.Annotate(ctx, "log-level", *logLevelStr)
|
||||
return merr.New("invalid log level", ctx)
|
||||
return merr.New("invalid log level", cmp.Context(),
|
||||
mctx.Annotated("log-level", *logLevelStr))
|
||||
}
|
||||
logger.SetMaxLevel(logLevel)
|
||||
return nil
|
||||
})
|
||||
|
||||
return ctx
|
||||
return cmp
|
||||
}
|
||||
|
||||
// ServiceContext extends ProcessContext so that it better supports long running
|
||||
// processes which are expected to handle requests from outside clients.
|
||||
// RootServiceComponent extends RootComponent so that it better supports long
|
||||
// running processes which are expected to handle requests from outside clients.
|
||||
//
|
||||
// Additional behavior it adds includes setting up an http endpoint where debug
|
||||
// information about the running process can be accessed.
|
||||
func ServiceContext() context.Context {
|
||||
ctx := ProcessContext()
|
||||
func RootServiceComponent() *mcmp.Component {
|
||||
cmp := RootComponent()
|
||||
|
||||
// services expect to use many different configuration sources
|
||||
ctx = context.WithValue(ctx, ctxKeyCfgSrc, mcfg.Source(mcfg.Sources{
|
||||
cmp.SetValue(cmpKeyCfgSrc, mcfg.Source(mcfg.Sources{
|
||||
new(mcfg.SourceEnv),
|
||||
new(mcfg.SourceCLI),
|
||||
}))
|
||||
|
||||
// it's useful to show debug entries (from this package specifically) as
|
||||
// info logs for long-running services.
|
||||
ctx = context.WithValue(ctx, ctxKeyInfoLog, true)
|
||||
cmp.SetValue(cmpKeyInfoLog, true)
|
||||
|
||||
// TODO set up the debug endpoint.
|
||||
return ctx
|
||||
return cmp
|
||||
}
|
||||
|
||||
// Start performs the work of populating configuration parameters and triggering
|
||||
// the start event. It will return once the Start event has completed running.
|
||||
//
|
||||
// This function returns a Context because there are cases where the Context
|
||||
// will be modified during Start, such as if WithSubCommand was used. If the
|
||||
// Context was not modified then the passed in Context will be returned.
|
||||
func Start(ctx context.Context) context.Context {
|
||||
src, _ := ctx.Value(ctxKeyCfgSrc).(mcfg.Source)
|
||||
if src == nil {
|
||||
mlog.Fatal("ctx not sourced from m package", ctx)
|
||||
// MustInit will call mrun.Init on the given Component, which must have been
|
||||
// created in this package, and exit the process if mrun.Init does not complete
|
||||
// successfully.
|
||||
func MustInit(cmp *mcmp.Component) {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||||
defer cancel()
|
||||
|
||||
debugLog(cmp, "initializing")
|
||||
if err := mrun.Init(ctx, cmp); err != nil {
|
||||
mlog.From(cmp).Fatal("initialization failed", merr.Context(err))
|
||||
}
|
||||
debugLog(cmp, "initialization completed successfully")
|
||||
}
|
||||
|
||||
// no logging should happen before populate, primarily because log-level
|
||||
// hasn't been populated yet, but also because it makes help output on cli
|
||||
// look weird.
|
||||
ctx, err := mcfg.Populate(ctx, src)
|
||||
if err != nil {
|
||||
mlog.Fatal("error populating configuration", ctx, merr.Context(err))
|
||||
} else if err := mrun.Start(ctx); err != nil {
|
||||
mlog.Fatal("error triggering start event", ctx, merr.Context(err))
|
||||
// MustShutdown is like MustInit, except that it triggers the Shutdown event on
|
||||
// the Component.
|
||||
func MustShutdown(cmp *mcmp.Component) {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||||
defer cancel()
|
||||
|
||||
debugLog(cmp, "shutting down")
|
||||
if err := mrun.Shutdown(ctx, cmp); err != nil {
|
||||
mlog.From(cmp).Fatal("shutdown failed", merr.Context(err))
|
||||
}
|
||||
debugLog("start hooks completed", ctx)
|
||||
return ctx
|
||||
debugLog(cmp, "shutting down completed successfully")
|
||||
}
|
||||
|
||||
// StartWaitStop performs the work of populating configuration parameters,
|
||||
// triggering the start event, waiting for an interrupt, and then triggering the
|
||||
// stop event. Run will block until the stop event is done. If any errors are
|
||||
// encountered a fatal is thrown.
|
||||
func StartWaitStop(ctx context.Context) {
|
||||
ctx = Start(ctx)
|
||||
|
||||
// Exec calls MustInit on the given Component, then blocks until an interrupt
|
||||
// signal is received, then calls MustShutdown on the Component, until finally
|
||||
// exiting the process.
|
||||
func Exec(cmp *mcmp.Component) {
|
||||
MustInit(cmp)
|
||||
{
|
||||
ch := make(chan os.Signal, 1)
|
||||
signal.Notify(ch, os.Interrupt)
|
||||
s := <-ch
|
||||
debugLog("signal received, stopping", mctx.Annotate(ctx, "signal", s))
|
||||
debugLog(cmp, "signal received, stopping", mctx.Annotated("signal", s))
|
||||
}
|
||||
MustShutdown(cmp)
|
||||
|
||||
if err := mrun.Stop(ctx); err != nil {
|
||||
mlog.Fatal("error triggering stop event", ctx, merr.Context(err))
|
||||
}
|
||||
debugLog("exiting process", ctx)
|
||||
debugLog(cmp, "exiting process")
|
||||
os.Stdout.Sync()
|
||||
os.Stderr.Sync()
|
||||
os.Exit(0)
|
||||
}
|
||||
|
||||
31
m/m_test.go
31
m/m_test.go
@ -6,47 +6,42 @@ import (
|
||||
. "testing"
|
||||
|
||||
"github.com/mediocregopher/mediocre-go-lib/mcfg"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mlog"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mrun"
|
||||
"github.com/mediocregopher/mediocre-go-lib/mtest/massert"
|
||||
)
|
||||
|
||||
func TestServiceCtx(t *T) {
|
||||
t.Run("log-level", func(t *T) {
|
||||
ctx := ServiceContext()
|
||||
cmp := RootComponent()
|
||||
|
||||
// pull the Logger out of the ctx and set the Handler on it, so we can check
|
||||
// the log level
|
||||
// pull the Logger out of the component and set the Handler on it, so we
|
||||
// can check the log level
|
||||
var msgs []mlog.Message
|
||||
logger := mlog.From(ctx)
|
||||
logger := mlog.GetLogger(cmp)
|
||||
logger.SetHandler(func(msg mlog.Message) error {
|
||||
msgs = append(msgs, msg)
|
||||
return nil
|
||||
})
|
||||
mlog.SetLogger(cmp, logger)
|
||||
|
||||
// create a child Context before running to ensure it the change propagates
|
||||
// create a child Component before running to ensure it the change propagates
|
||||
// correctly.
|
||||
ctxA := mctx.NewChild(ctx, "A")
|
||||
ctx = mctx.WithChild(ctx, ctxA)
|
||||
cmpA := cmp.Child("A")
|
||||
|
||||
params := mcfg.ParamValues{{Name: "log-level", Value: json.RawMessage(`"DEBUG"`)}}
|
||||
if _, err := mcfg.Populate(ctx, params); err != nil {
|
||||
t.Fatal(err)
|
||||
} else if err := mrun.Start(ctx); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
cmp.SetValue(cmpKeyCfgSrc, params)
|
||||
MustInit(cmp)
|
||||
|
||||
mlog.From(ctxA).Info("foo", ctxA)
|
||||
mlog.From(ctxA).Debug("bar", ctxA)
|
||||
mlog.From(cmpA).Info("foo")
|
||||
mlog.From(cmpA).Debug("bar")
|
||||
massert.Require(t,
|
||||
massert.Length(msgs, 2),
|
||||
massert.Equal(msgs[0].Level.String(), "INFO"),
|
||||
massert.Equal(msgs[0].Description, "foo"),
|
||||
massert.Equal(msgs[0].Contexts, []context.Context{ctxA}),
|
||||
massert.Equal(msgs[0].Contexts, []context.Context{cmpA.Context()}),
|
||||
massert.Equal(msgs[1].Level.String(), "DEBUG"),
|
||||
massert.Equal(msgs[1].Description, "bar"),
|
||||
massert.Equal(msgs[1].Contexts, []context.Context{ctxA}),
|
||||
massert.Equal(msgs[1].Contexts, []context.Context{cmpA.Context()}),
|
||||
)
|
||||
})
|
||||
}
|
||||
|
||||
36
mlog/cmp.go
36
mlog/cmp.go
@ -11,31 +11,45 @@ type cmpKey int
|
||||
// retrieved from the Component, or any of its children, using From.
|
||||
func SetLogger(cmp *mcmp.Component, l *Logger) {
|
||||
cmp.SetValue(cmpKey(0), l)
|
||||
|
||||
// If the base Logger on this Component gets changed, then the cached Logger
|
||||
// from From on this Component, and all of its Children, ought to be reset,
|
||||
// so that any changes can be reflected in their loggers.
|
||||
var resetFromLogger func(*mcmp.Component)
|
||||
resetFromLogger = func(cmp *mcmp.Component) {
|
||||
cmp.SetValue(cmpKey(1), nil)
|
||||
for _, childCmp := range cmp.Children() {
|
||||
resetFromLogger(childCmp)
|
||||
}
|
||||
}
|
||||
resetFromLogger(cmp)
|
||||
}
|
||||
|
||||
// DefaultLogger is an instance of Logger which is returned by From when a
|
||||
// Logger hasn't been previously set with SetLogger on the passed in Component.
|
||||
var DefaultLogger = NewLogger()
|
||||
|
||||
// From returns the Logger which was set on the Component, or one of its
|
||||
// GetLogger returns the Logger which was set on the Component, or on of its
|
||||
// ancestors, using SetLogger. If no Logger was ever set then DefaultLogger is
|
||||
// returned.
|
||||
//
|
||||
// The returned Logger will be modified such that it will implicitly merge the
|
||||
// Contexts of any Message into the given Component's Context.
|
||||
func GetLogger(cmp *mcmp.Component) *Logger {
|
||||
if l, ok := cmp.InheritedValue(cmpKey(0)); ok {
|
||||
return l.(*Logger)
|
||||
}
|
||||
return DefaultLogger
|
||||
}
|
||||
|
||||
// From returns the result from GetLogger, modified so as to automatically add
|
||||
// some annotations related to the Component itself to all Messages being
|
||||
// logged.
|
||||
func From(cmp *mcmp.Component) *Logger {
|
||||
var l *Logger
|
||||
if l, _ = cmp.Value(cmpKey(1)).(*Logger); l != nil {
|
||||
if l, _ := cmp.Value(cmpKey(1)).(*Logger); l != nil {
|
||||
return l
|
||||
} else if lInt, ok := cmp.InheritedValue(cmpKey(0)); ok {
|
||||
l = lInt.(*Logger)
|
||||
} else {
|
||||
l = DefaultLogger
|
||||
}
|
||||
|
||||
// if we're here it means a modified Logger wasn't set on this particular
|
||||
// Component, and therefore the current one must be modified.
|
||||
l = l.Clone()
|
||||
l := GetLogger(cmp).Clone()
|
||||
oldHandler := l.Handler()
|
||||
l.SetHandler(func(msg Message) error {
|
||||
ctx := mctx.MergeAnnotationsInto(cmp.Context(), msg.Contexts...)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user