examples/pubsub.go - google-api-go-client - Git at Google

 // Copyright 2017 Google Inc. All Rights Reserved.
 //
 // 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
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package main

 import (
 	"bufio"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"log"
 	"net"
 	"net/http"
 	"net/textproto"
 	"os"
 	"strings"

 	pubsub "google.golang.org/api/pubsub/v1beta2"
 )

 const USAGE = `Available arguments are:
     <project_id> list_topics
     <project_id> create_topic <topic>
     <project_id> delete_topic <topic>
     <project_id> list_subscriptions
     <project_id> create_subscription <subscription> <linked topic>
     <project_id> delete_subscription <subscription>
     <project_id> connect_irc <topic> <server> <channel>
     <project_id> pull_messages <subscription>
 `

 type IRCBot struct {
 	server   string
 	port     string
 	nick     string
 	user     string
 	channel  string
 	conn     net.Conn
 	tpReader *textproto.Reader
 }

 func NewIRCBot(server, channel, nick string) *IRCBot {
 	return &IRCBot{
 		server:  server,
 		port:    "6667",
 		nick:    nick,
 		channel: channel,
 		conn:    nil,
 		user:    nick,
 	}
 }

 func (bot *IRCBot) Connect() {
 	conn, err := net.Dial("tcp", bot.server+":"+bot.port)
 	if err != nil {
 		log.Fatal("unable to connect to IRC server ", err)
 	}
 	bot.conn = conn
 	log.Printf("Connected to IRC server %s (%s)\n",
 		bot.server, bot.conn.RemoteAddr())
 	bot.tpReader = textproto.NewReader(bufio.NewReader(bot.conn))
 	bot.Sendf("USER %s 8 * :%s\r\n", bot.nick, bot.nick)
 	bot.Sendf("NICK %s\r\n", bot.nick)
 	bot.Sendf("JOIN %s\r\n", bot.channel)
 }

 func (bot *IRCBot) CheckConnection() {
 	for {
 		line, err := bot.ReadLine()
 		if err != nil {
 			log.Fatal("Unable to read a line during checking the connection.")
 		}
 		if parts := strings.Split(line, " "); len(parts) > 1 {
 			if parts[1] == "004" {
 				log.Println("The nick accepted.")
 			} else if parts[1] == "433" {
 				log.Fatalf("The nick is already in use: %s", line)
 			} else if parts[1] == "366" {
 				log.Println("Starting to publish messages.")
 				return
 			}
 		}
 	}
 }

 func (bot *IRCBot) Sendf(format string, args ...interface{}) {
 	fmt.Fprintf(bot.conn, format, args...)
 }

 func (bot *IRCBot) Close() {
 	bot.conn.Close()
 }

 func (bot *IRCBot) ReadLine() (line string, err error) {
 	return bot.tpReader.ReadLine()
 }

 func init() {
 	registerDemo("pubsub", pubsub.PubsubScope, pubsubMain)
 }

 func pubsubUsage() {
 	fmt.Fprint(os.Stderr, USAGE)
 }

 // Returns a fully qualified resource name for Cloud Pub/Sub.
 func fqrn(res, proj, name string) string {
 	return fmt.Sprintf("projects/%s/%s/%s", proj, res, name)
 }

 func fullTopicName(proj, topic string) string {
 	return fqrn("topics", proj, topic)
 }

 func fullSubName(proj, topic string) string {
 	return fqrn("subscriptions", proj, topic)
 }

 // Check the length of the arguments.
 func checkArgs(argv []string, min int) {
 	if len(argv) < min {
 		pubsubUsage()
 		os.Exit(2)
 	}
 }

 func listTopics(service *pubsub.Service, argv []string) {
 	next := ""
 	for {
 		topicsList, err := service.Projects.Topics.List(fmt.Sprintf("projects/%s", argv[0])).PageToken(next).Do()
 		if err != nil {
 			log.Fatalf("listTopics query.Do() failed: %v", err)
 		}
 		for _, topic := range topicsList.Topics {
 			fmt.Println(topic.Name)
 		}
 		next = topicsList.NextPageToken
 		if next == "" {
 			break
 		}
 	}
 }

 func createTopic(service *pubsub.Service, argv []string) {
 	checkArgs(argv, 3)
 	topic, err := service.Projects.Topics.Create(fullTopicName(argv[0], argv[2]), &pubsub.Topic{}).Do()
 	if err != nil {
 		log.Fatalf("createTopic Create().Do() failed: %v", err)
 	}
 	fmt.Printf("Topic %s was created.\n", topic.Name)
 }

 func deleteTopic(service *pubsub.Service, argv []string) {
 	checkArgs(argv, 3)
 	topicName := fullTopicName(argv[0], argv[2])
 	if _, err := service.Projects.Topics.Delete(topicName).Do(); err != nil {
 		log.Fatalf("deleteTopic Delete().Do() failed: %v", err)
 	}
 	fmt.Printf("Topic %s was deleted.\n", topicName)
 }

 func listSubscriptions(service *pubsub.Service, argv []string) {
 	next := ""
 	for {
 		subscriptionsList, err := service.Projects.Subscriptions.List(fmt.Sprintf("projects/%s", argv[0])).PageToken(next).Do()
 		if err != nil {
 			log.Fatalf("listSubscriptions query.Do() failed: %v", err)
 		}
 		for _, subscription := range subscriptionsList.Subscriptions {
 			sub_text, _ := json.MarshalIndent(subscription, "", "  ")
 			fmt.Printf("%s\n", sub_text)
 		}
 		next = subscriptionsList.NextPageToken
 		if next == "" {
 			break
 		}
 	}
 }

 func createSubscription(service *pubsub.Service, argv []string) {
 	checkArgs(argv, 4)
 	name := fullSubName(argv[0], argv[2])
 	sub := &pubsub.Subscription{Topic: fullTopicName(argv[0], argv[3])}
 	subscription, err := service.Projects.Subscriptions.Create(name, sub).Do()
 	if err != nil {
 		log.Fatalf("createSubscription Create().Do() failed: %v", err)
 	}
 	fmt.Printf("Subscription %s was created.\n", subscription.Name)
 }

 func deleteSubscription(service *pubsub.Service, argv []string) {
 	checkArgs(argv, 3)
 	name := fullSubName(argv[0], argv[2])
 	if _, err := service.Projects.Subscriptions.Delete(name).Do(); err != nil {
 		log.Fatalf("deleteSubscription Delete().Do() failed: %v", err)
 	}
 	fmt.Printf("Subscription %s was deleted.\n", name)
 }

 func connectIRC(service *pubsub.Service, argv []string) {
 	checkArgs(argv, 5)
 	topicName := fullTopicName(argv[0], argv[2])
 	server := argv[3]
 	channel := argv[4]
 	nick := fmt.Sprintf("bot-%s", argv[2])
 	ircbot := NewIRCBot(server, channel, nick)
 	ircbot.Connect()
 	defer ircbot.Close()
 	ircbot.CheckConnection()
 	privMark := fmt.Sprintf("PRIVMSG %s :", ircbot.channel)
 	for {
 		line, err := ircbot.ReadLine()
 		if err != nil {
 			log.Fatal("Unable to read a line from the connection.")
 		}
 		parts := strings.Split(line, " ")
 		if len(parts) > 0 && parts[0] == "PING" {
 			ircbot.Sendf("PONG %s\r\n", parts[1])
 		} else {
 			pos := strings.Index(line, privMark)
 			if pos == -1 {
 				continue
 			}
 			privMsg := line[pos+len(privMark) : len(line)]
 			pubsubMessage := &pubsub.PubsubMessage{
 				Data: base64.StdEncoding.EncodeToString([]byte(privMsg)),
 			}
 			publishRequest := &pubsub.PublishRequest{
 				Messages: []*pubsub.PubsubMessage{pubsubMessage},
 			}
 			if _, err := service.Projects.Topics.Publish(topicName, publishRequest).Do(); err != nil {
 				log.Fatalf("connectIRC Publish().Do() failed: %v", err)
 			}
 			log.Println("Published a message to the topic.")
 		}
 	}
 }

 func pullMessages(service *pubsub.Service, argv []string) {
 	checkArgs(argv, 3)
 	subName := fullSubName(argv[0], argv[2])
 	pullRequest := &pubsub.PullRequest{
 		ReturnImmediately: false,
 		MaxMessages:       1,
 	}
 	for {
 		pullResponse, err := service.Projects.Subscriptions.Pull(subName, pullRequest).Do()
 		if err != nil {
 			log.Fatalf("pullMessages Pull().Do() failed: %v", err)
 		}
 		for _, receivedMessage := range pullResponse.ReceivedMessages {
 			data, err := base64.StdEncoding.DecodeString(receivedMessage.Message.Data)
 			if err != nil {
 				log.Fatalf("pullMessages DecodeString() failed: %v", err)
 			}
 			fmt.Printf("%s\n", data)
 			ackRequest := &pubsub.AcknowledgeRequest{
 				AckIds: []string{receivedMessage.AckId},
 			}
 			if _, err = service.Projects.Subscriptions.Acknowledge(subName, ackRequest).Do(); err != nil {
 				log.Printf("pullMessages Acknowledge().Do() failed: %v", err)
 			}
 		}
 	}
 }

 // This example demonstrates calling the Cloud Pub/Sub API. As of 20
 // Aug 2014, the Cloud Pub/Sub API is only available if you're
 // whitelisted. If you're interested in using it, please apply for the
 // Limited Preview program at the following form:
 // http://goo.gl/Wql9HL
 //
 // Also, before running this example, be sure to enable Cloud Pub/Sub
 // service on your project in Developer Console at:
 // https://console.developers.google.com/
 //
 // It has 8 subcommands as follows:
 //
 //  <project_id> list_topics
 //  <project_id> create_topic <topic>
 //  <project_id> delete_topic <topic>
 //  <project_id> list_subscriptions
 //  <project_id> create_subscription <subscription> <linked topic>
 //  <project_id> delete_subscription <subscription>
 //  <project_id> connect_irc <topic> <server> <channel>
 //  <project_id> pull_messages <subscription>
 //
 // You can use either of your alphanumerical or numerial Cloud Project
 // ID for project_id. You can choose any names for topic and
 // subscription as long as they follow the naming rule described at:
 // https://developers.google.com/pubsub/overview#names
 //
 // You can list/create/delete topics/subscriptions by self-explanatory
 // subcommands, as well as connect to an IRC channel and publish
 // messages from the IRC channel to a specified Cloud Pub/Sub topic by
 // the "connect_irc" subcommand, or continuously pull messages from a
 // specified Cloud Pub/Sub subscription and display the data by the
 // "pull_messages" subcommand.
 func pubsubMain(client *http.Client, argv []string) {
 	checkArgs(argv, 2)
 	service, err := pubsub.New(client)
 	if err != nil {
 		log.Fatalf("Unable to create PubSub service: %v", err)
 	}

 	m := map[string]func(service *pubsub.Service, argv []string){
 		"list_topics":         listTopics,
 		"create_topic":        createTopic,
 		"delete_topic":        deleteTopic,
 		"list_subscriptions":  listSubscriptions,
 		"create_subscription": createSubscription,
 		"delete_subscription": deleteSubscription,
 		"connect_irc":         connectIRC,
 		"pull_messages":       pullMessages,
 	}
 	f, ok := m[argv[1]]
 	if !ok {
 		pubsubUsage()
 		os.Exit(2)
 	}
 	f(service, argv)
 }
	// Copyright 2017 Google Inc. All Rights Reserved.
	//
	// 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
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package main

	import (
	"bufio"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"log"
	"net"
	"net/http"
	"net/textproto"
	"os"
	"strings"

	pubsub "google.golang.org/api/pubsub/v1beta2"
	)

	const USAGE = `Available arguments are:
	<project_id> list_topics
	<project_id> create_topic <topic>
	<project_id> delete_topic <topic>
	<project_id> list_subscriptions
	<project_id> create_subscription <subscription> <linked topic>
	<project_id> delete_subscription <subscription>
	<project_id> connect_irc <topic> <server> <channel>
	<project_id> pull_messages <subscription>
	`

	type IRCBot struct {
	server string
	port string
	nick string
	user string
	channel string
	conn net.Conn
	tpReader *textproto.Reader
	}

	func NewIRCBot(server, channel, nick string) *IRCBot {
	return &IRCBot{
	server: server,
	port: "6667",
	nick: nick,
	channel: channel,
	conn: nil,
	user: nick,
	}
	}

	func (bot *IRCBot) Connect() {
	conn, err := net.Dial("tcp", bot.server+":"+bot.port)
	if err != nil {
	log.Fatal("unable to connect to IRC server ", err)
	}
	bot.conn = conn
	log.Printf("Connected to IRC server %s (%s)\n",
	bot.server, bot.conn.RemoteAddr())
	bot.tpReader = textproto.NewReader(bufio.NewReader(bot.conn))
	bot.Sendf("USER %s 8 * :%s\r\n", bot.nick, bot.nick)
	bot.Sendf("NICK %s\r\n", bot.nick)
	bot.Sendf("JOIN %s\r\n", bot.channel)
	}

	func (bot *IRCBot) CheckConnection() {
	for {
	line, err := bot.ReadLine()
	if err != nil {
	log.Fatal("Unable to read a line during checking the connection.")
	}
	if parts := strings.Split(line, " "); len(parts) > 1 {
	if parts[1] == "004" {
	log.Println("The nick accepted.")
	} else if parts[1] == "433" {
	log.Fatalf("The nick is already in use: %s", line)
	} else if parts[1] == "366" {
	log.Println("Starting to publish messages.")
	return
	}
	}
	}
	}

	func (bot *IRCBot) Sendf(format string, args ...interface{}) {
	fmt.Fprintf(bot.conn, format, args...)
	}

	func (bot *IRCBot) Close() {
	bot.conn.Close()
	}

	func (bot *IRCBot) ReadLine() (line string, err error) {
	return bot.tpReader.ReadLine()
	}

	func init() {
	registerDemo("pubsub", pubsub.PubsubScope, pubsubMain)
	}

	func pubsubUsage() {
	fmt.Fprint(os.Stderr, USAGE)
	}

	// Returns a fully qualified resource name for Cloud Pub/Sub.
	func fqrn(res, proj, name string) string {
	return fmt.Sprintf("projects/%s/%s/%s", proj, res, name)
	}

	func fullTopicName(proj, topic string) string {
	return fqrn("topics", proj, topic)
	}

	func fullSubName(proj, topic string) string {
	return fqrn("subscriptions", proj, topic)
	}

	// Check the length of the arguments.
	func checkArgs(argv []string, min int) {
	if len(argv) < min {
	pubsubUsage()
	os.Exit(2)
	}
	}

	func listTopics(service *pubsub.Service, argv []string) {
	next := ""
	for {
	topicsList, err := service.Projects.Topics.List(fmt.Sprintf("projects/%s", argv[0])).PageToken(next).Do()
	if err != nil {
	log.Fatalf("listTopics query.Do() failed: %v", err)
	}
	for _, topic := range topicsList.Topics {
	fmt.Println(topic.Name)
	}
	next = topicsList.NextPageToken
	if next == "" {
	break
	}
	}
	}

	func createTopic(service *pubsub.Service, argv []string) {
	checkArgs(argv, 3)
	topic, err := service.Projects.Topics.Create(fullTopicName(argv[0], argv[2]), &pubsub.Topic{}).Do()
	if err != nil {
	log.Fatalf("createTopic Create().Do() failed: %v", err)
	}
	fmt.Printf("Topic %s was created.\n", topic.Name)
	}

	func deleteTopic(service *pubsub.Service, argv []string) {
	checkArgs(argv, 3)
	topicName := fullTopicName(argv[0], argv[2])
	if _, err := service.Projects.Topics.Delete(topicName).Do(); err != nil {
	log.Fatalf("deleteTopic Delete().Do() failed: %v", err)
	}
	fmt.Printf("Topic %s was deleted.\n", topicName)
	}

	func listSubscriptions(service *pubsub.Service, argv []string) {
	next := ""
	for {
	subscriptionsList, err := service.Projects.Subscriptions.List(fmt.Sprintf("projects/%s", argv[0])).PageToken(next).Do()
	if err != nil {
	log.Fatalf("listSubscriptions query.Do() failed: %v", err)
	}
	for _, subscription := range subscriptionsList.Subscriptions {
	sub_text, _ := json.MarshalIndent(subscription, "", " ")
	fmt.Printf("%s\n", sub_text)
	}
	next = subscriptionsList.NextPageToken
	if next == "" {
	break
	}
	}
	}

	func createSubscription(service *pubsub.Service, argv []string) {
	checkArgs(argv, 4)
	name := fullSubName(argv[0], argv[2])
	sub := &pubsub.Subscription{Topic: fullTopicName(argv[0], argv[3])}
	subscription, err := service.Projects.Subscriptions.Create(name, sub).Do()
	if err != nil {
	log.Fatalf("createSubscription Create().Do() failed: %v", err)
	}
	fmt.Printf("Subscription %s was created.\n", subscription.Name)
	}

	func deleteSubscription(service *pubsub.Service, argv []string) {
	checkArgs(argv, 3)
	name := fullSubName(argv[0], argv[2])
	if _, err := service.Projects.Subscriptions.Delete(name).Do(); err != nil {
	log.Fatalf("deleteSubscription Delete().Do() failed: %v", err)
	}
	fmt.Printf("Subscription %s was deleted.\n", name)
	}

	func connectIRC(service *pubsub.Service, argv []string) {
	checkArgs(argv, 5)
	topicName := fullTopicName(argv[0], argv[2])
	server := argv[3]
	channel := argv[4]
	nick := fmt.Sprintf("bot-%s", argv[2])
	ircbot := NewIRCBot(server, channel, nick)
	ircbot.Connect()
	defer ircbot.Close()
	ircbot.CheckConnection()
	privMark := fmt.Sprintf("PRIVMSG %s :", ircbot.channel)
	for {
	line, err := ircbot.ReadLine()
	if err != nil {
	log.Fatal("Unable to read a line from the connection.")
	}
	parts := strings.Split(line, " ")
	if len(parts) > 0 && parts[0] == "PING" {
	ircbot.Sendf("PONG %s\r\n", parts[1])
	} else {
	pos := strings.Index(line, privMark)
	if pos == -1 {
	continue
	}
	privMsg := line[pos+len(privMark) : len(line)]
	pubsubMessage := &pubsub.PubsubMessage{
	Data: base64.StdEncoding.EncodeToString([]byte(privMsg)),
	}
	publishRequest := &pubsub.PublishRequest{
	Messages: []*pubsub.PubsubMessage{pubsubMessage},
	}
	if _, err := service.Projects.Topics.Publish(topicName, publishRequest).Do(); err != nil {
	log.Fatalf("connectIRC Publish().Do() failed: %v", err)
	}
	log.Println("Published a message to the topic.")
	}
	}
	}

	func pullMessages(service *pubsub.Service, argv []string) {
	checkArgs(argv, 3)
	subName := fullSubName(argv[0], argv[2])
	pullRequest := &pubsub.PullRequest{
	ReturnImmediately: false,
	MaxMessages: 1,
	}
	for {
	pullResponse, err := service.Projects.Subscriptions.Pull(subName, pullRequest).Do()
	if err != nil {
	log.Fatalf("pullMessages Pull().Do() failed: %v", err)
	}
	for _, receivedMessage := range pullResponse.ReceivedMessages {
	data, err := base64.StdEncoding.DecodeString(receivedMessage.Message.Data)
	if err != nil {
	log.Fatalf("pullMessages DecodeString() failed: %v", err)
	}
	fmt.Printf("%s\n", data)
	ackRequest := &pubsub.AcknowledgeRequest{
	AckIds: []string{receivedMessage.AckId},
	}
	if _, err = service.Projects.Subscriptions.Acknowledge(subName, ackRequest).Do(); err != nil {
	log.Printf("pullMessages Acknowledge().Do() failed: %v", err)
	}
	}
	}
	}

	// This example demonstrates calling the Cloud Pub/Sub API. As of 20
	// Aug 2014, the Cloud Pub/Sub API is only available if you're
	// whitelisted. If you're interested in using it, please apply for the
	// Limited Preview program at the following form:
	// http://goo.gl/Wql9HL
	//
	// Also, before running this example, be sure to enable Cloud Pub/Sub
	// service on your project in Developer Console at:
	// https://console.developers.google.com/
	//
	// It has 8 subcommands as follows:
	//
	// <project_id> list_topics
	// <project_id> create_topic <topic>
	// <project_id> delete_topic <topic>
	// <project_id> list_subscriptions
	// <project_id> create_subscription <subscription> <linked topic>
	// <project_id> delete_subscription <subscription>
	// <project_id> connect_irc <topic> <server> <channel>
	// <project_id> pull_messages <subscription>
	//
	// You can use either of your alphanumerical or numerial Cloud Project
	// ID for project_id. You can choose any names for topic and
	// subscription as long as they follow the naming rule described at:
	// https://developers.google.com/pubsub/overview#names
	//
	// You can list/create/delete topics/subscriptions by self-explanatory
	// subcommands, as well as connect to an IRC channel and publish
	// messages from the IRC channel to a specified Cloud Pub/Sub topic by
	// the "connect_irc" subcommand, or continuously pull messages from a
	// specified Cloud Pub/Sub subscription and display the data by the
	// "pull_messages" subcommand.
	func pubsubMain(client *http.Client, argv []string) {
	checkArgs(argv, 2)
	service, err := pubsub.New(client)
	if err != nil {
	log.Fatalf("Unable to create PubSub service: %v", err)
	}

	m := map[string]func(service *pubsub.Service, argv []string){
	"list_topics": listTopics,
	"create_topic": createTopic,
	"delete_topic": deleteTopic,
	"list_subscriptions": listSubscriptions,
	"create_subscription": createSubscription,
	"delete_subscription": deleteSubscription,
	"connect_irc": connectIRC,
	"pull_messages": pullMessages,
	}
	f, ok := m[argv[1]]
	if !ok {
	pubsubUsage()
	os.Exit(2)
	}
	f(service, argv)
	}