Gcpc::Interceptors

Gcpc::Interceptors is a collection of interceptors for gcpc.

Installation

Add this line to your application’s Gemfile:

ruby gem 'gcpc-interceptors'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gcpc-interceptors

Usage

Interceptors for Publisher

```ruby require “gcpc” require “gcpc-interceptors”

publisher = Gcpc::Publisher.new( project_id: “project-example-1”, topic: “topic-example-1”, interceptors: [ Gcpc::Publisher::Interceptors::EncodeInterceptor.new( content_type: :json ), Gcpc::Interceptors::Publisher::IdInterceptor.new, Gcpc::Interceptors::Publisher::PublisherNameInterceptor.new( publisher: “publisher-A” ), Gcpc::Interceptors::Publisher::TimestampInterceptor.new, ] emulator_host: “localhost:8085”, )

jsondata = { key: :value } attributes = {} publisher.publish(jsondata, attributes) # published as {"key":"value"}, “published_by”:”publisher-A”,”published_at”:”2019-03-01T00:00:00+00:00” ```

Interceptors for Subscriber

```ruby require “gcpc” require “gcpc-interceptors”

class LogHandler < Gcpc::Subscriber::BaseHandler LOGGER = Logger.new(STDOUT)

def handle(data, attributes, message) LOGGER.info “#messagemessage.inspect” LOGGER.info “data: #data” LOGGER.info “attributes: #attributes” end end

redis_store = Gcpc::Interceptors::Utils::RedisStore.new(redis: Redis.new(ENV[“REDIS_URL”]))

class RaiseExceptionStrategy < Gcpc::Interceptors::Subscriber::CheckOrderInterceptor::BaseStrategy def on_swapped(data, attributes, message, &block) raise “Swapped!” end end

subscriber = Gcpc::Subscriber.new( project_id: “project-example-1”, subscription: “topic-example-1”, interceptors: [ Gcpc::Interceptors::Subscriber::DecodeInterceptor.new( strategy: Gcpc::Interceptors::Subscriber::DecodeInterceptor::JSONStrategy.new, ), Gcpc::Interceptors::Subscriber::CheckDupInterceptor.new( store: redis_store, ), Gcpc::Interceptors::Subscriber::CheckOrderInterceptor.new( store: redis_store, strategy: RaiseExceptionStrategy.new, ), ], emulator_host: “localhost:8085”, ) subscriber.handle(LogHandler)

subscriber.run ```

Development

After checking out the repo, run bin/setup to install dependencies. Then, run bundle exec rspec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/south37/gcpc-interceptors.

License

The gem is available as open source under the terms of the MIT License.