Prerequisite

• Suggested readings
  • Introduction to Google Cloud Pub/Sub
  • Implementation of Cloud Pub/Sub Publisher
• Domain name for Pub/Sub to push messages
  • The domain name/IP address are both accessible from the public web.
  • You can apply for qualified SSL certificate at SSL For Free.

Subscriber

Cloud Pub/Sub supports push and pull message delivery. In this post, we would dive into Push Subscrption.

Prerequisite

• Suggested readings
  • Google Cloud Pub/Sub - Introduction
  • Implementation of Cloud Pub/Sub Publisher

Subscriber

Cloud Pub/Sub supports push and pull message delivery. In this post, we would dive into the Pull Subscrption.

Prerequisite

• Apply free trial at GCP
• Install Cloud SDK
• Suggested readings
  • Introduction to Google Cloud Pub/Sub

Hands-On

Clone Repo

Now lets get into the hands-on!

# Clone repo and restore dependencies
$ git clone https://github.com/life1347/go-google-cloud-pubsub-exmaple.git \
  $GOPATH/src/tachingchen.com/googlePubSub

restore dependencies with godep

$ go get -u github.com/tools/godep
$ cd $GOPATH/src/tachingchen.com/googlePubSub && godep restore

Intro

Google Cloud Pub/Sub is a messaging service which lets independent applicaitons exchange messages with Publish/Subscribe model with others. There are pros and cons when using message servcie as a messaging middleware:

Pros

• reduce coupling between applications
• use message queue as buffer to hanlde large message request
• publish/subscribe to different topic depending on the situation

Cons

• the instantaneity, ordering and duplication of message are not guaranteed
• understand how the message is being delivered to avoid unexpected behavior of applicaitons.

Here are couple things that we may consider before choosing which message service to use:

• performance of message delivery
• scalability, reliability and availability