[instrumentation-fixes] make instrumentation occur (#27)

only once per request and use naming convention suggested by Rails guides

README.md

@@ -28,6 +28,7 @@ Installation: `gem install solrb`
     * [Dictionary boosting function](#dictionary-boosting-function)
   * [Field list](#field-list)
 * [Deleting documents](#deleting-documents)
+* [Active Support instrumentation](#active-support-instrumentation)
 * [Running specs](#running-specs)
 
 
@@ -287,6 +288,24 @@ Solr.delete_by_query('*:*')
 Solr.delete_by_query('*:*', commit: true)
 ```
 
+# Active Support instrumentation
+
+This gem publishes events via [Active Support Instrumentation](https://edgeguides.rubyonrails.org/active_support_instrumentation.html)
+
+To subscribe to solrb events, you can add this code to initializer:
+
+```ruby
+ActiveSupport::Notifications.subscribe('request.solrb')  do |*args|
+  event = ActiveSupport::Notifications::Event.new(*args)
+  if Logger::INFO == Rails.logger.level
+    Rails.logger.info("Solrb #{event.duration.round(1)}ms")
+  elsif Logger::DEBUG == Rails.logger.level && Rails.env.development?
+    Pry::ColorPrinter.pp(event.payload)
+  end
+end
+```
+
+
 
 # Running specs
 

lib/solr/connection.rb

@@ -1,7 +1,7 @@
 module Solr
   # low-level connection that can do network requests to Solr
   class Connection
-    INSTRUMENT_KEY = 'solrb.request'.freeze
+    INSTRUMENT_KEY = 'request.solrb'.freeze
 
     def initialize(url, faraday_options: Solr.configuration.faraday_options)
       # Allow mock the connection for testing

lib/solr/query/request/runner.rb

@@ -22,10 +22,7 @@ def initialize(page:, page_size:, solr_params: {})
 
         def run
           raw_response = connection(PATH).post_as_json(request_params)
-          response = Solr::Response.from_raw_response(raw_response)
-          Solr.instrument(name: 'solrb.request_response_cycle',
-                          data: { request: request_params, response: raw_response })
-          response
+          Solr::Response.from_raw_response(raw_response)
         end
 
         private

lib/solr/version.rb

@@ -1,3 +1,3 @@
 module Solr
-  VERSION = '0.1.4'.freeze
+  VERSION = '0.1.5'.freeze
 end