예제 #1
0
// Adds a database to the ServerContext.  Attempts a read after it gets the write
// lock to see if it's already been added by another process. If so, returns either the
// existing DatabaseContext or an error based on the useExisting flag.
func (sc *ServerContext) _getOrAddDatabaseFromConfig(config *DbConfig, useExisting bool) (*db.DatabaseContext, error) {

	server := "http://localhost:8091"
	pool := "default"
	bucketName := config.Name

	if config.Server != nil {
		server = *config.Server
	}
	if config.Pool != nil {
		pool = *config.Pool
	}
	if config.Bucket != nil {
		bucketName = *config.Bucket
	}
	dbName := config.Name
	if dbName == "" {
		dbName = bucketName
	}

	if sc.databases_[dbName] != nil {
		if useExisting {
			return sc.databases_[dbName], nil
		} else {
			return nil, base.HTTPErrorf(http.StatusPreconditionFailed, // what CouchDB returns
				"Duplicate database name %q", dbName)
		}
	}

	base.Logf("Opening db /%s as bucket %q, pool %q, server <%s>",
		dbName, bucketName, pool, server)

	if err := db.ValidateDatabaseName(dbName); err != nil {
		return nil, err
	}

	var importDocs, autoImport bool
	switch config.ImportDocs {
	case nil, false:
	case true:
		importDocs = true
	case "continuous":
		importDocs = true
		autoImport = true
	default:
		return nil, fmt.Errorf("Unrecognized value for ImportDocs: %#v", config.ImportDocs)
	}

	feedType := strings.ToLower(config.FeedType)

	// Connect to the bucket and add the database:
	spec := base.BucketSpec{
		Server:     server,
		PoolName:   pool,
		BucketName: bucketName,
		FeedType:   feedType,
	}

	// If we are using DCPSHARD feed type, set CbgtContext on bucket spec
	if feedType == strings.ToLower(base.DcpShardFeedType) {
		spec.CbgtContext = sc.CbgtContext
	}

	if config.Username != "" {
		spec.Auth = config
	}

	// Set cache properties, if present
	cacheOptions := db.CacheOptions{}
	if config.CacheConfig != nil {
		if config.CacheConfig.CachePendingSeqMaxNum != nil && *config.CacheConfig.CachePendingSeqMaxNum > 0 {
			cacheOptions.CachePendingSeqMaxNum = *config.CacheConfig.CachePendingSeqMaxNum
		}
		if config.CacheConfig.CachePendingSeqMaxWait != nil && *config.CacheConfig.CachePendingSeqMaxWait > 0 {
			cacheOptions.CachePendingSeqMaxWait = time.Duration(*config.CacheConfig.CachePendingSeqMaxWait) * time.Millisecond
		}
		if config.CacheConfig.CacheSkippedSeqMaxWait != nil && *config.CacheConfig.CacheSkippedSeqMaxWait > 0 {
			cacheOptions.CacheSkippedSeqMaxWait = time.Duration(*config.CacheConfig.CacheSkippedSeqMaxWait) * time.Millisecond
		}
		// set EnableStarChannelLog directly here (instead of via NewDatabaseContext), so that it's set when we create the channels view in ConnectToBucket
		if config.CacheConfig.EnableStarChannel != nil {
			db.EnableStarChannelLog = *config.CacheConfig.EnableStarChannel
		}

		if config.CacheConfig.ChannelCacheMaxLength != nil && *config.CacheConfig.ChannelCacheMaxLength > 0 {
			cacheOptions.ChannelCacheMaxLength = *config.CacheConfig.ChannelCacheMaxLength
		}
		if config.CacheConfig.ChannelCacheMinLength != nil && *config.CacheConfig.ChannelCacheMinLength > 0 {
			cacheOptions.ChannelCacheMinLength = *config.CacheConfig.ChannelCacheMinLength
		}
		if config.CacheConfig.ChannelCacheAge != nil && *config.CacheConfig.ChannelCacheAge > 0 {
			cacheOptions.ChannelCacheAge = time.Duration(*config.CacheConfig.ChannelCacheAge) * time.Second
		}

	}

	bucket, err := db.ConnectToBucket(spec, func(bucket string, err error) {
		base.Warn("Lost TAP feed for bucket %s, with error: %v", bucket, err)

		if dc := sc.databases_[dbName]; dc != nil {
			dc.TakeDbOffline("Lost TAP feed")
		}
	})

	if err != nil {
		return nil, err
	}

	// Channel index definition, if present
	channelIndexOptions := &db.ChangeIndexOptions{} // TODO: this is confusing!  why is it called both a "change index" and a "channel index"?
	sequenceHashOptions := &db.SequenceHashOptions{}
	if config.ChannelIndex != nil {
		indexServer := "http://localhost:8091"
		indexPool := "default"
		indexBucketName := ""

		if config.ChannelIndex.Server != nil {
			indexServer = *config.ChannelIndex.Server
		}
		if config.ChannelIndex.Pool != nil {
			indexPool = *config.ChannelIndex.Pool
		}
		if config.ChannelIndex.Bucket != nil {
			indexBucketName = *config.ChannelIndex.Bucket
		}
		indexSpec := base.BucketSpec{
			Server:          indexServer,
			PoolName:        indexPool,
			BucketName:      indexBucketName,
			CouchbaseDriver: base.GoCB,
		}
		if config.ChannelIndex.Username != "" {
			indexSpec.Auth = config.ChannelIndex
		}

		if config.ChannelIndex.NumShards != 0 {
			channelIndexOptions.NumShards = config.ChannelIndex.NumShards
		} else {
			channelIndexOptions.NumShards = 64
		}

		channelIndexOptions.ValidateOrPanic()

		channelIndexOptions.Spec = indexSpec
		channelIndexOptions.Writer = config.ChannelIndex.IndexWriter

		// TODO: separate config of hash bucket
		sequenceHashOptions.Bucket, err = base.GetBucket(indexSpec, nil)
		if err != nil {
			base.Logf("Error opening sequence hash bucket %q, pool %q, server <%s>",
				indexBucketName, indexPool, indexServer)
			// TODO: revert to local index?
			return nil, err
		}
		sequenceHashOptions.Size = 32
	} else {
		channelIndexOptions = nil
	}

	var revCacheSize uint32
	if config.RevCacheSize != nil && *config.RevCacheSize > 0 {
		revCacheSize = *config.RevCacheSize
	} else {
		revCacheSize = db.KDefaultRevisionCacheCapacity
	}

	contextOptions := db.DatabaseContextOptions{
		CacheOptions:          &cacheOptions,
		IndexOptions:          channelIndexOptions,
		SequenceHashOptions:   sequenceHashOptions,
		RevisionCacheCapacity: revCacheSize,
		AdminInterface:        sc.config.AdminInterface,
	}

	dbcontext, err := db.NewDatabaseContext(dbName, bucket, autoImport, contextOptions)
	if err != nil {
		return nil, err
	}
	dbcontext.BucketSpec = spec

	syncFn := ""
	if config.Sync != nil {
		syncFn = *config.Sync
	}
	if err := sc.applySyncFunction(dbcontext, syncFn); err != nil {
		return nil, err
	}

	if importDocs {
		db, _ := db.GetDatabase(dbcontext, nil)
		if _, err := db.UpdateAllDocChannels(false, true); err != nil {
			return nil, err
		}
	}

	if config.RevsLimit != nil && *config.RevsLimit > 0 {
		dbcontext.RevsLimit = *config.RevsLimit
	}

	dbcontext.AllowEmptyPassword = config.AllowEmptyPassword

	if dbcontext.ChannelMapper == nil {
		base.Logf("Using default sync function 'channel(doc.channels)' for database %q", dbName)
	}

	// Create default users & roles:
	if err := sc.installPrincipals(dbcontext, config.Roles, "role"); err != nil {
		return nil, err
	} else if err := sc.installPrincipals(dbcontext, config.Users, "user"); err != nil {
		return nil, err
	}

	emitAccessRelatedWarnings(config, dbcontext)

	// Install bucket-shadower if any:
	if shadow := config.Shadow; shadow != nil {
		if err := sc.startShadowing(dbcontext, shadow); err != nil {
			base.Warn("Database %q: unable to connect to external bucket for shadowing: %v",
				dbName, err)
		}
	}

	// Initialize event handlers
	if err := sc.initEventHandlers(dbcontext, config); err != nil {
		return nil, err
	}

	dbcontext.ExitChanges = make(chan struct{})

	// Register it so HTTP handlers can find it:
	sc.databases_[dbcontext.Name] = dbcontext

	// Save the config
	sc.config.Databases[config.Name] = config

	if config.StartOffline {
		atomic.StoreUint32(&dbcontext.State, db.DBOffline)
		if dbcontext.EventMgr.HasHandlerForEvent(db.DBStateChange) {
			dbcontext.EventMgr.RaiseDBStateChangeEvent(dbName, "offline", "DB loaded from config", *sc.config.AdminInterface)
		}
	} else {
		atomic.StoreUint32(&dbcontext.State, db.DBOnline)
		if dbcontext.EventMgr.HasHandlerForEvent(db.DBStateChange) {
			dbcontext.EventMgr.RaiseDBStateChangeEvent(dbName, "online", "DB loaded from config", *sc.config.AdminInterface)
		}
	}

	return dbcontext, nil
}
예제 #2
0
// Adds a database to the ServerContext.  Attempts a read after it gets the write
// lock to see if it's already been added by another process. If so, returns either the
// existing DatabaseContext or an error based on the useExisting flag.
func (sc *ServerContext) getOrAddDatabaseFromConfig(config *DbConfig, useExisting bool) (*db.DatabaseContext, error) {
	// Obtain write lock during add database, to avoid race condition when creating based on ConfigServer
	sc.lock.Lock()
	defer sc.lock.Unlock()

	server := "http://localhost:8091"
	pool := "default"
	bucketName := config.Name

	if config.Server != nil {
		server = *config.Server
	}
	if config.Pool != nil {
		pool = *config.Pool
	}
	if config.Bucket != nil {
		bucketName = *config.Bucket
	}
	dbName := config.Name
	if dbName == "" {
		dbName = bucketName
	}

	if sc.databases_[dbName] != nil {
		if useExisting {
			return sc.databases_[dbName], nil
		} else {
			return nil, base.HTTPErrorf(http.StatusPreconditionFailed, // what CouchDB returns
				"Duplicate database name %q", dbName)
		}
	}

	base.Logf("Opening db /%s as bucket %q, pool %q, server <%s>",
		dbName, bucketName, pool, server)

	if err := db.ValidateDatabaseName(dbName); err != nil {
		return nil, err
	}

	var importDocs, autoImport bool
	switch config.ImportDocs {
	case nil, false:
	case true:
		importDocs = true
	case "continuous":
		importDocs = true
		autoImport = true
	default:
		return nil, fmt.Errorf("Unrecognized value for ImportDocs: %#v", config.ImportDocs)
	}

	feedType := strings.ToLower(config.FeedType)

	// Connect to the bucket and add the database:
	spec := base.BucketSpec{
		Server:     server,
		PoolName:   pool,
		BucketName: bucketName,
		FeedType:   feedType,
	}
	if config.Username != "" {
		spec.Auth = config
	}

	// Set cache properties, if present
	cacheOptions := db.CacheOptions{}
	if config.CacheConfig != nil {
		if config.CacheConfig.CachePendingSeqMaxNum != nil && *config.CacheConfig.CachePendingSeqMaxNum > 0 {
			cacheOptions.CachePendingSeqMaxNum = *config.CacheConfig.CachePendingSeqMaxNum
		}
		if config.CacheConfig.CachePendingSeqMaxWait != nil && *config.CacheConfig.CachePendingSeqMaxWait > 0 {
			cacheOptions.CachePendingSeqMaxWait = time.Duration(*config.CacheConfig.CachePendingSeqMaxWait) * time.Millisecond
		}
		if config.CacheConfig.CacheSkippedSeqMaxWait != nil && *config.CacheConfig.CacheSkippedSeqMaxWait > 0 {
			cacheOptions.CacheSkippedSeqMaxWait = time.Duration(*config.CacheConfig.CacheSkippedSeqMaxWait) * time.Millisecond
		}
		// set EnableStarChannelLog directly here (instead of via NewDatabaseContext), so that it's set when we create the channels view in ConnectToBucket
		if config.CacheConfig.EnableStarChannel != nil {
			db.EnableStarChannelLog = *config.CacheConfig.EnableStarChannel
		}
	}

	bucket, err := db.ConnectToBucket(spec)
	if err != nil {
		return nil, err
	}

	dbcontext, err := db.NewDatabaseContext(dbName, bucket, autoImport, cacheOptions)
	if err != nil {
		return nil, err
	}

	syncFn := ""
	if config.Sync != nil {
		syncFn = *config.Sync
	}
	if err := sc.applySyncFunction(dbcontext, syncFn); err != nil {
		return nil, err
	}

	if importDocs {
		db, _ := db.GetDatabase(dbcontext, nil)
		if _, err := db.UpdateAllDocChannels(false, true); err != nil {
			return nil, err
		}
	}

	if config.RevsLimit != nil && *config.RevsLimit > 0 {
		dbcontext.RevsLimit = *config.RevsLimit
	}

	dbcontext.AllowEmptyPassword = config.AllowEmptyPassword

	if dbcontext.ChannelMapper == nil {
		base.Logf("Using default sync function 'channel(doc.channels)' for database %q", dbName)
	}

	// Create default users & roles:
	if err := sc.installPrincipals(dbcontext, config.Roles, "role"); err != nil {
		return nil, err
	} else if err := sc.installPrincipals(dbcontext, config.Users, "user"); err != nil {
		return nil, err
	}

	// Install bucket-shadower if any:
	if shadow := config.Shadow; shadow != nil {
		if err := sc.startShadowing(dbcontext, shadow); err != nil {
			base.Warn("Database %q: unable to connect to external bucket for shadowing: %v",
				dbName, err)
		}
	}

	// Initialize event handlers, if any:
	if config.EventHandlers != nil {
		// Process document commit event handlers
		if err = sc.processEventHandlersForEvent(config.EventHandlers.DocumentChanged, db.DocumentChange, dbcontext); err != nil {
			return nil, err
		}
		// WaitForProcess uses string, to support both omitempty and zero values
		customWaitTime := int64(-1)
		if config.EventHandlers.WaitForProcess != "" {
			customWaitTime, err = strconv.ParseInt(config.EventHandlers.WaitForProcess, 10, 0)
			if err != nil {
				customWaitTime = -1
				base.Warn("Error parsing wait_for_process from config, using default %s", err)
			}
		}
		dbcontext.EventMgr.Start(config.EventHandlers.MaxEventProc, int(customWaitTime))
	}

	// Register it so HTTP handlers can find it:
	sc.databases_[dbcontext.Name] = dbcontext

	// Save the config
	sc.config.Databases[config.Name] = config
	return dbcontext, nil
}