141 lines
4.6 KiB
Go
141 lines
4.6 KiB
Go
// Fast Paste Bin - uberfast and easy-to-use pastebin.
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//
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// Copyright (c) 2018, Stanislav N. aka pztrn and Fast Paste Bin
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// developers.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject
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// to the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
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// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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package context
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import (
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// stdlib
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"io/ioutil"
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"os"
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"path/filepath"
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// local
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"go.dev.pztrn.name/fastpastebin/internal/config"
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databaseinterface "go.dev.pztrn.name/fastpastebin/internal/database/interface"
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// other
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"github.com/labstack/echo"
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"github.com/rs/zerolog"
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"go.dev.pztrn.name/flagger"
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"gopkg.in/yaml.v2"
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)
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// Context is a some sort of singleton. Basically it's a structure that
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// initialized once and then passed to all parts of application. It
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// contains everything every part of application need, like configuration
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// access, logger, etc.
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type Context struct {
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Config *config.Struct
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Database databaseinterface.Interface
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Echo *echo.Echo
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Flagger *flagger.Flagger
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Logger zerolog.Logger
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}
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// Initialize initializes context.
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func (c *Context) Initialize() {
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c.initializeLogger()
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c.Flagger = flagger.New("fastpastebin", nil)
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c.Flagger.Initialize()
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_ = c.Flagger.AddFlag(&flagger.Flag{
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Name: "config",
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Description: "Configuration file path. Can be overridded with FASTPASTEBIN_CONFIG environment variable (this is what used in tests).",
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Type: "string",
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DefaultValue: "NO_CONFIG",
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})
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}
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// InitializePost initializes everything that needs a configuration.
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func (c *Context) InitializePost() {
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c.initializeLoggerPost()
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c.initializeHTTPServer()
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}
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// LoadConfiguration loads configuration and executes right after Flagger
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// have parsed CLI flags, because it depends on "-config" defined in
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// Initialize().
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func (c *Context) LoadConfiguration() {
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c.Logger.Info().Msg("Loading configuration...")
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configPath := ""
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// We're accepting configuration path from "-config" CLI parameter
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// and FASTPASTEBIN_CONFIG environment variable. Later have higher
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// weight and can override "-config" value.
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configPathFromCLI, err := c.Flagger.GetStringValue("config")
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configPathFromEnv, configPathFromEnvFound := os.LookupEnv("FASTPASTEBIN_CONFIG")
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if err != nil && configPathFromEnvFound || err == nil && configPathFromEnvFound {
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configPath = configPathFromEnv
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} else if err != nil && !configPathFromEnvFound || err == nil && configPathFromCLI == "NO_CONFIG" {
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c.Logger.Panic().Msg("Configuration file path wasn't passed via '-config' or 'FASTPASTEBIN_CONFIG' environment variable. Cannot continue.")
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} else if err == nil && !configPathFromEnvFound {
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configPath = configPathFromCLI
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}
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// Normalize file path.
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normalizedConfigPath, err1 := filepath.Abs(configPath)
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if err1 != nil {
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c.Logger.Fatal().Err(err1).Msg("Failed to normalize path to configuration file")
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}
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c.Logger.Debug().Str("path", configPath).Msg("Configuration file path")
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c.Config = &config.Struct{}
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// Read configuration file.
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fileData, err2 := ioutil.ReadFile(normalizedConfigPath)
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if err2 != nil {
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c.Logger.Panic().Err(err2).Msg("Failed to read configuration file")
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}
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// Parse it into structure.
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err3 := yaml.Unmarshal(fileData, c.Config)
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if err3 != nil {
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c.Logger.Panic().Err(err3).Msg("Failed to parse configuration file")
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}
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// Yay! See what it gets!
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c.Logger.Debug().Msgf("Parsed configuration: %+v", c.Config)
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}
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// RegisterDatabaseInterface registers database interface for later use.
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func (c *Context) RegisterDatabaseInterface(di databaseinterface.Interface) {
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c.Database = di
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}
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// RegisterEcho registers Echo instance for later usage.
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func (c *Context) RegisterEcho(e *echo.Echo) {
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c.Echo = e
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}
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// Shutdown shutdowns entire application.
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func (c *Context) Shutdown() {
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c.Logger.Info().Msg("Shutting down Fast Pastebin...")
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c.Database.Shutdown()
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}
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