| // Copyright 2020 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // Package config reads and writes hacksaw configuration data to io |
| package config |
| |
| import ( |
| "encoding/json" |
| "io" |
| "io/ioutil" |
| "os" |
| "sync" |
| ) |
| |
| type Config struct { |
| DefaultCodebase string |
| Codebases map[string]string //key: name, value: path |
| Workspaces map[string]string //key: name, value: codebase |
| } |
| |
| //Read the configuration from an io.Reader |
| func (c *Config) Read(input io.Reader) error { |
| cfgBytes, err := ioutil.ReadAll(input) |
| if err != nil { |
| return err |
| } |
| return json.Unmarshal(cfgBytes, &c) |
| } |
| |
| //Write the configuration to an io.Writer |
| func (c Config) Write(output io.Writer) error { |
| cfgBytes, err := json.MarshalIndent(c, "", " ") |
| if err != nil { |
| return err |
| } |
| _, err = output.Write(cfgBytes) |
| return err |
| } |
| |
| func (c *Config) ReadConfigFromFile(filePath string) error { |
| _, err := os.Stat(filePath) |
| if err != nil { |
| return err |
| } |
| cfgFile, err := os.Open(filePath) |
| if err != nil { |
| return err |
| } |
| defer cfgFile.Close() |
| err = c.Read(cfgFile) |
| return err |
| } |
| |
| func (c Config) WriteConfigToFile(filePath string) error { |
| cfgFile, err := os.Create(filePath) |
| if err != nil { |
| return err |
| } |
| defer cfgFile.Close() |
| return c.Write(cfgFile) |
| } |
| |
| //Config gets a copy of the config |
| func (c Config) Copy() Config { |
| cfgCopy := Config{ |
| DefaultCodebase: c.DefaultCodebase, |
| Codebases: map[string]string{}, |
| Workspaces: map[string]string{}} |
| for name, path := range c.Codebases { |
| cfgCopy.Codebases[name] = path |
| } |
| for name, codebase := range c.Workspaces { |
| cfgCopy.Workspaces[name] = codebase |
| } |
| return cfgCopy |
| } |
| |
| //Reset sets the config to zero values |
| func (c *Config) Reset() { |
| *c = Config{ |
| DefaultCodebase: "", |
| Codebases: map[string]string{}, |
| Workspaces: map[string]string{}} |
| } |
| |
| var singleton *Config |
| var once sync.Once |
| |
| //Config gets the singleton config instance |
| func GetConfig() *Config { |
| once.Do(func() { |
| singleton = &Config{ |
| DefaultCodebase: "", |
| Codebases: map[string]string{}, |
| Workspaces: map[string]string{}} |
| }) |
| return singleton |
| } |