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54 lines
1.7 KiB
54 lines
1.7 KiB
// Package mdatastore implements connecting to Google's Datastore service and
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// simplifying a number of interactions with it.
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package mdatastore
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import (
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"context"
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"cloud.google.com/go/datastore"
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"github.com/mediocregopher/mediocre-go-lib/mctx"
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"github.com/mediocregopher/mediocre-go-lib/mdb"
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"github.com/mediocregopher/mediocre-go-lib/merr"
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"github.com/mediocregopher/mediocre-go-lib/mlog"
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"github.com/mediocregopher/mediocre-go-lib/mrun"
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)
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// Datastore is a wrapper around a datastore client providing more
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// functionality.
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type Datastore struct {
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*datastore.Client
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gce *mdb.GCE
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ctx context.Context
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}
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// WithDatastore returns a Datastore instance which will be initialized and
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// configured when the start event is triggered on the returned Context (see
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// mrun.Start). The Datastore instance will have Close called on it when the
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// stop event is triggered on the returned Context (see mrun.Stop).
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//
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// gce is optional and can be passed in if there's an existing gce object which
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// should be used, otherwise a new one will be created with mdb.MGCE.
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func WithDatastore(parent context.Context, gce *mdb.GCE) (context.Context, *Datastore) {
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ctx := mctx.NewChild(parent, "datastore")
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if gce == nil {
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ctx, gce = mdb.WithGCE(ctx, "")
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}
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ds := &Datastore{
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gce: gce,
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}
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ctx = mrun.WithStartHook(ctx, func(innerCtx context.Context) error {
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ds.ctx = mctx.MergeAnnotations(ds.ctx, ds.gce.Context())
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mlog.Info("connecting to datastore", ds.ctx)
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var err error
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ds.Client, err = datastore.NewClient(innerCtx, ds.gce.Project, ds.gce.ClientOptions()...)
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return merr.Wrap(err, ds.ctx)
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})
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ctx = mrun.WithStopHook(ctx, func(context.Context) error {
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return ds.Client.Close()
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})
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ds.ctx = ctx
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return mctx.WithChild(parent, ctx), ds
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}
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