update log find method, log db connection, add logs_db default config

lib/travis/api/v3/models/log.rb

@@ -1,6 +1,6 @@
 module Travis::API::V3
   class Models::Log < Model
-    establish_connection 'logs_database'
+    establish_connection(Travis.config.logs_database)
     belongs_to :job
     belongs_to :removed_by, class_name: 'User', foreign_key: :removed_by
     has_many  :log_parts, dependent: :destroy

lib/travis/api/v3/models/log_part.rb

@@ -1,6 +1,6 @@
 module Travis::API::V3
   class Models::LogPart < Model
-    establish_connection 'logs_database'
+    establish_connection(Travis.config.logs_database)
     belongs_to :log
   end
 end

lib/travis/api/v3/queries/log.rb

@@ -5,9 +5,9 @@ module Travis::API::V3
 
     def find(job)
       #check for the log in the Logs DB
-      log = Models::Log.find_by_job_id
+      log = Models::Log.find_by_job_id(job.id)
       #if the log exists and has not been archived yet, then collect the log_parts and return the Log query object
-      unless !log.archived_at.nil?
+      if !log.archived_at.nil?
         log_parts = Models::LogPart.where(log_id: log.id).to_a
       elsif log.archived_at?
         ## if it's not there then fetch it from S3, and return it wrapped as a compatible log_parts object with a hard coded #number (log_parts have a number) and the parts chunked (not sure how to do this)

lib/travis/config/defaults.rb

@@ -18,6 +18,7 @@ module Travis
             assets:        { host: HOSTS[Travis.env.to_sym] },
             amqp:          { username: 'guest', password: 'guest', host: 'localhost', prefetch: 1 },
             database:      { adapter: 'postgresql', database: "travis_#{Travis.env}", encoding: 'unicode', min_messages: 'warning', variables: { statement_timeout: 10_000 } },
+            logs_database: { adapter: 'postgresql', database: "travis_logs_#{Travis.env}", encoding: 'unicode', min_messages: 'warning', variables: { statement_timeout: 10_000 } },
             s3:            { access_key_id: '', secret_access_key: '' },
             pusher:        { app_id: 'app-id', key: 'key', secret: 'secret' },
             sidekiq:       { namespace: 'sidekiq', pool_size: 1 },

spec/v3/services/log/find_spec.rb

@@ -10,9 +10,8 @@ describe Travis::API::V3::Services::Log::Find, set_app: true do
   let(:parsed_body) { JSON.load(body) }
 
   context 'when log stored in db' do
-    describe 'returns log as plain text' do
+    describe 'returns log as array of Log Parts' do
       let(:log) { job.log }
-
       before { get("/v3/job/#{job.id}/log", {}, headers) }
 
       example { expect(last_response).to be_ok }