110 lines
3.0 KiB
Go
110 lines
3.0 KiB
Go
// Package mbigtable implements connecting to Google's Bigtable service and
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// simplifying a number of interactions with it.
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package mbigtable
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import (
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"context"
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"strings"
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"cloud.google.com/go/bigtable"
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"github.com/mediocregopher/mediocre-go-lib/m"
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"github.com/mediocregopher/mediocre-go-lib/mcfg"
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"github.com/mediocregopher/mediocre-go-lib/mdb"
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"github.com/mediocregopher/mediocre-go-lib/mlog"
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)
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func isErrAlreadyExists(err error) bool {
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if err == nil {
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return false
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}
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return strings.HasSuffix(err.Error(), " already exists")
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}
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// Bigtable is a wrapper around a bigtable client providing more functionality.
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type Bigtable struct {
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*bigtable.Client
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Instance string
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gce *mdb.GCE
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log *mlog.Logger
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}
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// Cfg configurs and returns a Bigtable instance which will be usable once
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// StartRun is called on the passed in Cfg instance.
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//
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// defaultInstance can be given as the instance name to use as the default
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// parameter value. If empty the parameter will be required to be set.
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func Cfg(cfg *mcfg.Cfg, defaultInstance string) *Bigtable {
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cfg = cfg.Child("bigtable")
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var bt Bigtable
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bt.gce = mdb.CfgGCE(cfg)
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bt.log = m.Log(cfg, &bt)
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var inst *string
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{
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name, descr := "instance", "name of the bigtable instance in the project to connect to"
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if defaultInstance != "" {
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inst = cfg.ParamString(name, defaultInstance, descr)
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} else {
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inst = cfg.ParamRequiredString(name, descr)
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}
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}
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cfg.Start.Then(func(ctx context.Context) error {
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bt.Instance = *inst
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bt.log.Info("connecting to bigtable")
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var err error
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bt.Client, err = bigtable.NewClient(
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ctx,
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bt.gce.Project, bt.Instance,
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bt.gce.ClientOptions()...,
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)
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return mlog.ErrWithKV(err, &bt)
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})
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return &bt
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}
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// KV implements the mlog.KVer interface.
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func (bt *Bigtable) KV() mlog.KV {
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return bt.gce.KV().Set("instance", bt.Instance)
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}
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// EnsureTable ensures that the given table exists and has (at least) the given
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// column families.
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//
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// This method requires admin privileges on the bigtable instance.
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func (bt *Bigtable) EnsureTable(ctx context.Context, name string, colFams ...string) error {
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kv := bt.KV().Set("table", name)
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bt.log.Info("ensuring table", kv)
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bt.log.Debug("creating admin client", kv)
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adminClient, err := bigtable.NewAdminClient(ctx, bt.gce.Project, bt.Instance)
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if err != nil {
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return mlog.ErrWithKV(err, kv)
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}
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defer adminClient.Close()
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bt.log.Debug("creating bigtable table (if needed)", kv)
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err = adminClient.CreateTable(ctx, name)
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if err != nil && !isErrAlreadyExists(err) {
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return mlog.ErrWithKV(err, kv)
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}
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for _, colFam := range colFams {
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kv := kv.Set("family", colFam)
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bt.log.Debug("creating bigtable column family (if needed)", kv)
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err := adminClient.CreateColumnFamily(ctx, name, colFam)
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if err != nil && !isErrAlreadyExists(err) {
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return mlog.ErrWithKV(err, kv)
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}
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}
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return nil
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}
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// Table returns the bigtable.Table instance which can be used to write/query
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// the given table.
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func (bt *Bigtable) Table(tableName string) *bigtable.Table {
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return bt.Open(tableName)
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}
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