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128 lines
2.6 KiB
128 lines
2.6 KiB
// Copyright 2011 Numerotron Inc.
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// Use of this source code is governed by an MIT-style license
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// that can be found in the LICENSE file.
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//
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// Developed at www.stathat.com by Patrick Crosby
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// Contact us on twitter with any questions: twitter.com/stat_hat
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// The jconfig package provides a simple, basic configuration file parser using JSON.
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package util
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import (
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"bytes"
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"code.google.com/p/weed-fs/go/glog"
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"encoding/json"
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"os"
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)
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type Config struct {
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data map[string]interface{}
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filename string
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}
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func newConfig() *Config {
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result := new(Config)
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result.data = make(map[string]interface{})
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return result
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}
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// Loads config information from a JSON file
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func LoadConfig(filename string) *Config {
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result := newConfig()
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result.filename = filename
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err := result.parse()
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if err != nil {
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glog.Fatalf("error loading config file %s: %s", filename, err)
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}
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return result
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}
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// Loads config information from a JSON string
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func LoadConfigString(s string) *Config {
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result := newConfig()
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err := json.Unmarshal([]byte(s), &result.data)
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if err != nil {
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glog.Fatalf("error parsing config string %s: %s", s, err)
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}
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return result
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}
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func (c *Config) StringMerge(s string) {
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next := LoadConfigString(s)
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c.merge(next.data)
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}
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func (c *Config) LoadMerge(filename string) {
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next := LoadConfig(filename)
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c.merge(next.data)
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}
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func (c *Config) merge(ndata map[string]interface{}) {
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for k, v := range ndata {
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c.data[k] = v
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}
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}
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func (c *Config) parse() error {
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f, err := os.Open(c.filename)
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if err != nil {
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return err
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}
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defer f.Close()
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b := new(bytes.Buffer)
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_, err = b.ReadFrom(f)
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if err != nil {
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return err
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}
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err = json.Unmarshal(b.Bytes(), &c.data)
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if err != nil {
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return err
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}
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return nil
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}
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// Returns a string for the config variable key
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func (c *Config) GetString(key string) string {
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result, present := c.data[key]
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if !present {
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return ""
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}
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return result.(string)
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}
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// Returns an int for the config variable key
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func (c *Config) GetInt(key string) int {
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x, ok := c.data[key]
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if !ok {
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return -1
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}
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return int(x.(float64))
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}
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// Returns a float for the config variable key
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func (c *Config) GetFloat(key string) float64 {
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x, ok := c.data[key]
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if !ok {
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return -1
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}
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return x.(float64)
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}
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// Returns a bool for the config variable key
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func (c *Config) GetBool(key string) bool {
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x, ok := c.data[key]
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if !ok {
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return false
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}
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return x.(bool)
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}
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// Returns an array for the config variable key
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func (c *Config) GetArray(key string) []interface{} {
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result, present := c.data[key]
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if !present {
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return []interface{}(nil)
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}
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return result.([]interface{})
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}
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