Update to sse client with heartbeat detection + exponential backoff

ldclient-rb.gemspec

@@ -29,8 +29,10 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "faraday-http-cache", "~> 1.3.0"
   spec.add_runtime_dependency "thread_safe", "~> 0.3"
   spec.add_runtime_dependency "net-http-persistent", "~> 2.9"
-  spec.add_runtime_dependency "concurrent-ruby", "~> 1.0.0"
+  spec.add_runtime_dependency "concurrent-ruby", "~> 1.0.4"
   spec.add_runtime_dependency "hashdiff", "~> 0.2"
-  spec.add_runtime_dependency "ld-celluloid-eventsource", "~> 0.5"
+  spec.add_runtime_dependency "ld-celluloid-eventsource", "~> 0.8.1"
+  spec.add_runtime_dependency "nio4r", "~> 1.1" # for maximum ruby version compatibility.
+
   spec.add_runtime_dependency "waitutil", "0.2"
 end

lib/ldclient-rb/config.rb

@@ -37,7 +37,7 @@ class Config
     # @option opts [Boolean] :offline (false) Whether the client should be initialized in 
     #   offline mode. In offline mode, default values are returned for all flags and no 
     #   remote network requests are made.
-    # @option opts [Float] :poll_interval (30) The number of seconds between polls for flag updates
+    # @option opts [Float] :poll_interval (1) The number of seconds between polls for flag updates
     #   if streaming is off.
     # @option opts [Boolean] :stream (true) Whether or not the streaming API should be used to receive flag updates.
     #

lib/ldclient-rb/requestor.rb

@@ -24,13 +24,16 @@ def request_flag(key)
     end
 
     def make_request(path)
-      res = @client.get (@config.base_uri + path) do |req|
+      uri = @config.base_uri + path
+      res = @client.get (uri) do |req|
         req.headers["Authorization"] = @sdk_key
         req.headers["User-Agent"] = "RubyClient/" + LaunchDarkly::VERSION
         req.options.timeout = @config.read_timeout
         req.options.open_timeout = @config.connect_timeout
       end
 
+      @config.logger.debug("[LDClient] Got response from uri: #{uri}\n\tstatus code: #{res.status}\n\theaders: #{res.headers}\n\tbody: #{res.body}")
+
       if res.status == 401
         @config.logger.error("[LDClient] Invalid SDK key")
         return nil

lib/ldclient-rb/stream.rb

@@ -1,6 +1,6 @@
 require "concurrent/atomics"
 require "json"
-require "celluloid/eventsource"
+require "ld_celluloid_eventsource/eventsource"
 
 module LaunchDarkly
   PUT = :put
@@ -40,14 +40,11 @@ def start
         conn.on(DELETE) { |message| process_message(message, DELETE) }
         conn.on(INDIRECT_PUT) { |message| process_message(message, INDIRECT_PUT) }
         conn.on(INDIRECT_PATCH) { |message| process_message(message, INDIRECT_PATCH) }
-        conn.on_error do |message|
-          @config.logger.error("[LDClient] Error connecting to stream. Status code: #{message[:status_code]}")
-        end
       end
     end
 
     def process_message(message, method)
-      @config.logger.debug("[LDClient] Stream received #{method} message")
+      @config.logger.debug("[LDClient] Stream received #{method} message: #{message.data}")
       if method == PUT
         message = JSON.parse(message.data, symbolize_names: true)
         @store.init(message)