Database dialects, proper database shutdown, pagination in configuration.

Added possibility to use different database (storage) backends. Currently
supported: flatfiles and mysql. Fixes #2.

Added database shutdown call. This call will properly shutdown database
connections (in case of RDBMS) or flush pastes index cache on disk (in
case of flatfiles).

De-hardcoded pagination count. Fixes #12.

config/database.go

@@ -26,6 +26,8 @@ package config
 
 // ConfigDatabase describes database configuration.
 type ConfigDatabase struct {
+	Type     string `yaml:"type"`
+	Path     string `yaml:"path"`
 	Address  string `yaml:"address"`
 	Port     string `yaml:"port"`
 	Username string `yaml:"username"`

config/pastes.go

@@ -0,0 +1,30 @@
+// Fast Paste Bin - uberfast and easy-to-use pastebin.
+//
+// Copyright (c) 2018, Stanislav N. aka pztrn and Fast Paste Bin
+// developers.
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject
+// to the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+package config
+
+// ConfigPastes describes pastes subsystem configuration.
+type ConfigPastes struct {
+	Pagination int `yaml:"pagination"`
+}

config/struct.go

@@ -29,4 +29,5 @@ type ConfigStruct struct {
 	Database ConfigDatabase `yaml:"database"`
 	Logging  ConfigLogging  `yaml:"logging"`
 	HTTP     ConfigHTTP     `yaml:"http"`
+	Pastes   ConfigPastes   `yaml:"pastes"`
 }