mediocre-go-lib/mdb/mdb.go

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// Package mdb contains a number of database wrappers for databases I commonly
// use
package mdb
import (
"context"
"github.com/mediocregopher/mediocre-go-lib/mcfg"
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"github.com/mediocregopher/mediocre-go-lib/mctx"
"github.com/mediocregopher/mediocre-go-lib/mrun"
"google.golang.org/api/option"
)
// GCE wraps configuration parameters commonly used for interacting with GCE
// services.
type GCE struct {
ctx context.Context
Project string
CredFile string
}
// WithGCE returns a GCE instance which will be initialized and configured when
// the start event is triggered on the returned Context (see mrun.Start).
// defaultProject is used as the default value for the mcfg parameter this
// function creates.
func WithGCE(parent context.Context, defaultProject string) (context.Context, *GCE) {
ctx := mctx.NewChild(parent, "gce")
ctx, credFile := mcfg.WithString(ctx, "cred-file", "", "Path to GCE credientials JSON file, if any")
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var project *string
const projectUsage = "Name of GCE project to use"
if defaultProject == "" {
ctx, project = mcfg.WithRequiredString(ctx, "project", projectUsage)
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} else {
ctx, project = mcfg.WithString(ctx, "project", defaultProject, projectUsage)
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}
var gce GCE
ctx = mrun.WithStartHook(ctx, func(context.Context) error {
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gce.Project = *project
gce.CredFile = *credFile
gce.ctx = mctx.Annotate(ctx, "project", gce.Project)
return nil
})
gce.ctx = ctx
return mctx.WithChild(parent, ctx), &gce
}
// ClientOptions generates and returns the ClientOption instances which can be
// passed into most GCE client drivers.
func (gce *GCE) ClientOptions() []option.ClientOption {
var opts []option.ClientOption
if gce.CredFile != "" {
opts = append(opts, option.WithCredentialsFile(gce.CredFile))
}
return opts
}
// Context returns the annotated Context from this instance's initialization.
func (gce *GCE) Context() context.Context {
return gce.ctx
}