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Copy pathconfig.go
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270 lines (235 loc) · 6.67 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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
//
// http://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
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
)
var (
// DEFAULT_SECTION specifies the name of a section if no name provided.
DEFAULT_SECTION = "default"
// DEFAULT_COMMENT defines what character(s) indicate a comment `#`.
DEFAULT_COMMENT = []byte{'#'}
// DEFAULT_COMMENT_SEM defines what alternate character(s) indicate a comment `;`.
DEFAULT_COMMENT_SEM = []byte{';'}
// DEFAULT_MULTI_LINE_SEPARATOR defines what character indicates a multi-line content.
DEFAULT_MULTI_LINE_SEPARATOR = []byte{'\\'}
)
// ConfigInterface defines the behavior of a Config implementation.
type ConfigInterface interface {
String(key string) string
Strings(key string) []string
Bool(key string) (bool, error)
Int(key string) (int, error)
Int64(key string) (int64, error)
Float64(key string) (float64, error)
Set(key string, value string) error
}
// Config represents an implementation of the ConfigInterface.
type Config struct {
// Section:key=value
data map[string]map[string]string
}
// NewConfig create an empty configuration representation from file.
func NewConfig(confName string) (ConfigInterface, error) {
c := &Config{
data: make(map[string]map[string]string),
}
err := c.parse(confName)
return c, err
}
// NewConfigFromText create an empty configuration representation from text.
func NewConfigFromText(text string) (ConfigInterface, error) {
c := &Config{
data: make(map[string]map[string]string),
}
err := c.parseBuffer(bufio.NewReader(strings.NewReader(text)))
return c, err
}
// AddConfig adds a new section->key:value to the configuration.
func (c *Config) AddConfig(section string, option string, value string) bool {
if section == "" {
section = DEFAULT_SECTION
}
if _, ok := c.data[section]; !ok {
c.data[section] = make(map[string]string)
}
_, ok := c.data[section][option]
c.data[section][option] = value
return !ok
}
func (c *Config) parse(fname string) (err error) {
f, err := os.Open(fname)
if err != nil {
return err
}
defer f.Close()
buf := bufio.NewReader(f)
return c.parseBuffer(buf)
}
func (c *Config) parseBuffer(buf *bufio.Reader) error {
var section string
var lineNum int
var buffer bytes.Buffer
var canWrite bool
for {
if canWrite {
if err := c.write(section, lineNum, &buffer); err != nil {
return err
} else {
canWrite = false
}
}
lineNum++
line, _, err := buf.ReadLine()
if err == io.EOF {
// force write when buffer is not flushed yet
if buffer.Len() > 0 {
if err = c.write(section, lineNum, &buffer); err != nil {
return err
}
}
break
} else if err != nil {
return err
}
line = bytes.TrimSpace(line)
switch {
case bytes.Equal(line, []byte{}), bytes.HasPrefix(line, DEFAULT_COMMENT_SEM),
bytes.HasPrefix(line, DEFAULT_COMMENT):
canWrite = true
continue
case bytes.HasPrefix(line, []byte{'['}) && bytes.HasSuffix(line, []byte{']'}):
// force write when buffer is not flushed yet
if buffer.Len() > 0 {
if err := c.write(section, lineNum, &buffer); err != nil {
return err
}
canWrite = false
}
section = string(line[1 : len(line)-1])
default:
var p []byte
if bytes.HasSuffix(line, DEFAULT_MULTI_LINE_SEPARATOR) {
p = bytes.TrimSpace(line[:len(line)-1])
p = append(p, " "...)
} else {
p = line
canWrite = true
}
end := len(p)
for i, value := range p {
if value == DEFAULT_COMMENT[0] || value == DEFAULT_COMMENT_SEM[0] {
end = i
break
}
}
if _, err := buffer.Write(p[:end]); err != nil {
return err
}
}
}
return nil
}
func (c *Config) write(section string, lineNum int, b *bytes.Buffer) error {
if b.Len() <= 0 {
return nil
}
optionVal := bytes.SplitN(b.Bytes(), []byte{'='}, 2)
if len(optionVal) != 2 {
return fmt.Errorf("parse the content error : line %d , %s = ? ", lineNum, optionVal[0])
}
option := bytes.TrimSpace(optionVal[0])
value := bytes.TrimSpace(optionVal[1])
c.AddConfig(section, string(option), string(value))
// flush buffer after adding
b.Reset()
return nil
}
// Bool lookups up the value using the provided key and converts the value to a bool.
func (c *Config) Bool(key string) (bool, error) {
return strconv.ParseBool(c.get(key))
}
// Int lookups up the value using the provided key and converts the value to a int.
func (c *Config) Int(key string) (int, error) {
return strconv.Atoi(c.get(key))
}
// Int64 lookups up the value using the provided key and converts the value to a int64.
func (c *Config) Int64(key string) (int64, error) {
return strconv.ParseInt(c.get(key), 10, 64)
}
// Float64 lookups up the value using the provided key and converts the value to a float64.
func (c *Config) Float64(key string) (float64, error) {
return strconv.ParseFloat(c.get(key), 64)
}
// String lookups up the value using the provided key and converts the value to a string.
func (c *Config) String(key string) string {
return c.get(key)
}
// Strings lookups up the value using the provided key and converts the value to an array of string
// by splitting the string by comma.
func (c *Config) Strings(key string) []string {
v := c.get(key)
if v == "" {
return nil
}
return strings.Split(v, ",")
}
// Set sets the value for the specific key in the Config.
func (c *Config) Set(key string, value string) error {
if len(key) == 0 {
return errors.New("key is empty")
}
var (
section string
option string
)
keys := strings.Split(strings.ToLower(key), "::")
if len(keys) >= 2 {
section = keys[0]
option = keys[1]
} else {
option = keys[0]
}
c.AddConfig(section, option, value)
return nil
}
// section.key or key.
func (c *Config) get(key string) string {
var (
section string
option string
)
keys := strings.Split(strings.ToLower(key), "::")
if len(keys) >= 2 {
section = keys[0]
option = keys[1]
} else {
section = DEFAULT_SECTION
option = keys[0]
}
if value, ok := c.data[section][option]; ok {
return value
}
return ""
}