fix: use strict mode when using mysql

Ensure that values that are too long for a mysql column raise an error, not truncate

lib/db.rb

@@ -30,6 +30,7 @@ def self.connect db_credentials
     con.extension(:connection_validator)
     con.pool.connection_validation_timeout = -1 #Check the connection on every request
     con.timezone = :utc
+    con.run("SET sql_mode='STRICT_TRANS_TABLES';") if db_credentials[:adapter].to_s =~ /mysql/
     con
   end
 

lib/pact_broker/app.rb

@@ -63,6 +63,7 @@ def configure_database_connection
       PactBroker::DB.connection = configuration.database_connection
       PactBroker::DB.connection.timezone = :utc
       PactBroker::DB.validate_connection_config if configuration.validate_database_connection_config
+      PactBroker::DB.set_mysql_strict_mode_if_mysql
       Sequel.datetime_class = DateTime
       Sequel.database_timezone = :utc # Store all dates in UTC, assume any date without a TZ is UTC
       Sequel.application_timezone = :local # Convert dates to localtime when retrieving from database

lib/pact_broker/db.rb

@@ -24,5 +24,13 @@ def self.run_migrations database_connection
     def self.validate_connection_config
       PactBroker::DB::ValidateEncoding.(connection)
     end
+
+    def self.set_mysql_strict_mode_if_mysql
+      connection.run("SET sql_mode='STRICT_TRANS_TABLES';") if mysql?
+    end
+
+    def self.mysql?
+      connection.adapter_scheme =~ /mysql/
+    end
   end
 end

lib/pact_broker/pacts/merger.rb

@@ -19,6 +19,9 @@ def conflict? original_json, additional_json
 
       # Accepts two hashes representing pacts, outputs a merged hash
       # Does not make any guarantees about order of interactions
+      # TODO: should not modify original!
+      # TODO: is not checking response for equality!
+      # TODO: should have separate tests!
       def merge_pacts original_json, additional_json
         original, additional = [original_json, additional_json].map{|str| JSON.parse(str, PACT_PARSING_OPTIONS) }