mirror of
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109 lines
3.4 KiB
Go
109 lines
3.4 KiB
Go
// Copyright 2014 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package pubsub // import "cloud.google.com/go/pubsub"
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import (
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"context"
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"fmt"
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"os"
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"runtime"
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"time"
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"cloud.google.com/go/internal/version"
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vkit "cloud.google.com/go/pubsub/apiv1"
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"google.golang.org/api/option"
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"google.golang.org/grpc"
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"google.golang.org/grpc/keepalive"
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)
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const (
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// ScopePubSub grants permissions to view and manage Pub/Sub
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// topics and subscriptions.
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ScopePubSub = "https://www.googleapis.com/auth/pubsub"
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// ScopeCloudPlatform grants permissions to view and manage your data
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// across Google Cloud Platform services.
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ScopeCloudPlatform = "https://www.googleapis.com/auth/cloud-platform"
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maxAckDeadline = 10 * time.Minute
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)
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// Client is a Google Pub/Sub client scoped to a single project.
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//
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// Clients should be reused rather than being created as needed.
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// A Client may be shared by multiple goroutines.
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type Client struct {
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projectID string
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pubc *vkit.PublisherClient
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subc *vkit.SubscriberClient
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}
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// NewClient creates a new PubSub client.
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func NewClient(ctx context.Context, projectID string, opts ...option.ClientOption) (c *Client, err error) {
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var o []option.ClientOption
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// Environment variables for gcloud emulator:
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// https://cloud.google.com/sdk/gcloud/reference/beta/emulators/pubsub/
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if addr := os.Getenv("PUBSUB_EMULATOR_HOST"); addr != "" {
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conn, err := grpc.Dial(addr, grpc.WithInsecure())
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if err != nil {
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return nil, fmt.Errorf("grpc.Dial: %v", err)
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}
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o = []option.ClientOption{option.WithGRPCConn(conn)}
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} else {
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o = []option.ClientOption{
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// Create multiple connections to increase throughput.
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option.WithGRPCConnectionPool(runtime.GOMAXPROCS(0)),
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option.WithGRPCDialOption(grpc.WithKeepaliveParams(keepalive.ClientParameters{
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Time: 5 * time.Minute,
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})),
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}
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o = append(o, openCensusOptions()...)
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}
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o = append(o, opts...)
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pubc, err := vkit.NewPublisherClient(ctx, o...)
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if err != nil {
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return nil, fmt.Errorf("pubsub: %v", err)
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}
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subc, err := vkit.NewSubscriberClient(ctx, option.WithGRPCConn(pubc.Connection()))
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if err != nil {
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// Should never happen, since we are passing in the connection.
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// If it does, we cannot close, because the user may have passed in their
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// own connection originally.
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return nil, fmt.Errorf("pubsub: %v", err)
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}
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pubc.SetGoogleClientInfo("gccl", version.Repo)
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subc.SetGoogleClientInfo("gccl", version.Repo)
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return &Client{
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projectID: projectID,
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pubc: pubc,
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subc: subc,
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}, nil
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}
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// Close releases any resources held by the client,
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// such as memory and goroutines.
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//
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// If the client is available for the lifetime of the program, then Close need not be
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// called at exit.
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func (c *Client) Close() error {
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// Return the first error, because the first call closes the connection.
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err := c.pubc.Close()
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_ = c.subc.Close()
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return err
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}
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func (c *Client) fullyQualifiedProjectName() string {
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return fmt.Sprintf("projects/%s", c.projectID)
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}
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