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// Copyright 2016 The LUCI Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package distributor
import (
dm ""
tq ""
// Config represents the configuration for a single instance of a given
// distributor implementation at a given point in time (e.g. version).
type Config struct {
// DMHost is the host for the DM API. This may be used by the distributor
// implementation to pass to jobs so that they can call back into DM's api.
DMHost string
// Name is the name of this distributor configuration. This is always the
// fully-resolved name of the configuration (i.e. aliases are dereferenced).
Name string
// Version is the version of the distributor configuration retrieved from
// luci-config.
Version string
// Content is the actual parsed implementation-specific configuration.
Content proto.Message
// EnqueueTask allows a Distributor to enqueue a TaskQueue task that will be
// handled by the Distributor's HandleTaskQueueTask method.
func (cfg *Config) EnqueueTask(c context.Context, tsk *tq.Task) error {
tsk.Path = handlerPath(cfg.Name)
return tq.Add(c, "", tsk)
// PrepareTopic returns a pubsub topic that notifications should be sent to, and
// is meant to be called from the D.Run method.
// It returns the full name of the topic and a token that will be used to route
// PubSub messages back to the Distributor. The publisher to the topic must be
// instructed to put the token into the 'auth_token' attribute of PubSub
// messages. DM will know how to route such messages to D.HandleNotification.
func (cfg *Config) PrepareTopic(c context.Context, eid *dm.Execution_ID) (topic pubsub.Topic, token string, err error) {
topic = pubsub.NewTopic(info.TrimmedAppID(c), notifyTopicSuffix)
if err := topic.Validate(); err != nil {
panic(fmt.Errorf("failed to validate Topic %q: %s", topic, err))
token, err = encodeAuthToken(c, eid, cfg.Name)