configparser

package module
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 Go to latest Published: Nov 25, 2015 License: BSD-3-Clause Imports: 9 Imported by: 0

README

configparser

Package configparser provides a simple parser for reading/writing configuration (INI) files.

Supports reading/writing the INI file format in addition to:

  • Reading/writing duplicate section names (ex: MySQL NDB engine's config.ini)
  • Options without values (ex: can be used to group a set of hostnames)
  • Options without a named section (ex: a simple option=value file)
  • Find sections with regexp pattern matching on section names, ex: dc1.east.webservers where regex is '.webservers'

  • or ; as comment delimiter

  • = or : as value delimiter
package configparser_test

import (
    "fmt"
    "github.com/alyu/configparser"
    "log"
)

// Read and modify a configuration file
func Example() {
    config, err := configparser.Read("/etc/config.ini")
    if err != nil {
        log.Fatal(err)
    }
    // Print the full configuration
    fmt.Println(config)

    // get a section
    section, err := config.Section("MYSQLD DEFAULT")
    if err != nil {
        log.Fatal(err)
    } else {
        fmt.Printf("TotalSendBufferMemory=%s\n", section.ValueOf("TotalSendBufferMemory"))

        // set new value
        var oldValue = section.SetValueFor("TotalSendBufferMemory", "256M")
        fmt.Printf("TotalSendBufferMemory=%s, old value=%s\n", section.ValueOf("TotalSendBufferMemory"), oldValue)

        // delete option
        oldValue = section.Delete("DefaultOperationRedoProblemAction")
        fmt.Println("Deleted DefaultOperationRedoProblemAction: " + oldValue)

        // add new options
        section.Add("innodb_buffer_pool_size", "64G")
        section.Add("innodb_buffer_pool_instances", "8")
    }

    // add a new section and options
    section = config.NewSection("NDBD MGM")
    section.Add("NodeId", "2")
    section.Add("HostName", "10.10.10.10")
    section.Add("PortNumber", "1186")
    section.Add("ArbitrationRank", "1")

    // find all sections ending with .webservers
    sections, err := config.Find(".webservers$")
    if err != nil {
        log.Fatal(err)
    }
    for _, section := range sections {
        fmt.Print(section)
    }
    // or
    config.PrintSection("dc1.webservers")

    sections, err = config.Delete("NDB_MGMD DEFAULT")
    if err != nil {
        log.Fatal(err)
    }
    // deleted sections
    for _, section := range sections {
        fmt.Print(section)
    }

    options := section.Options()
    fmt.Println(options["HostName"])

    // save the new config. the original will be renamed to /etc/config.ini.bak
    err = configparser.Save(config, "/etc/config.ini")
    if err != nil {
        log.Fatal(err)
    }
}

Documentation

Overview

Package configparser provides a simple parser for reading/writing configuration (INI) files.

Supports reading/writing the INI file format in addition to:

  • Reading/writing duplicate section names (ex: MySQL NDB engine's config.ini)
  • Options without values (ex: can be used to group a set of hostnames)
  • Options without a named section (ex: a simple option=value file)
  • Find sections with regexp pattern matching on section names, ex: dc1.east.webservers where regex is '.webservers'
  • # or ; as comment delimiter
  • = or : as value delimiter
Example

Read and modify a configuration file 

package main

import (
	"fmt"
	"github.com/alyu/configparser"
	"log"
)

func main() {
	config, err := configparser.Read("/etc/config.ini")
	if err != nil {
		log.Fatal(err)
	}
	// Print the full configuration
	fmt.Println(config)

	// get a section
	section, err := config.Section("MYSQLD DEFAULT")
	if err != nil {
		log.Fatal(err)
	} else {
		fmt.Printf("TotalSendBufferMemory=%s\n", section.ValueOf("TotalSendBufferMemory"))

		// set new value
		var oldValue = section.SetValueFor("TotalSendBufferMemory", "256M")
		fmt.Printf("TotalSendBufferMemory=%s, old value=%s\n", section.ValueOf("TotalSendBufferMemory"), oldValue)

		// delete option
		oldValue = section.Delete("DefaultOperationRedoProblemAction")
		fmt.Println("Deleted DefaultOperationRedoProblemAction: " + oldValue)

		// add new options
		section.Add("innodb_buffer_pool_size", "64G")
		section.Add("innodb_buffer_pool_instances", "8")
	}

	// add a new section and options
	section = config.NewSection("NDBD MGM")
	section.Add("NodeId", "2")
	section.Add("HostName", "10.10.10.10")
	section.Add("PortNumber", "1186")
	section.Add("ArbitrationRank", "1")

	// find all sections ending with .webservers
	sections, err := config.Find(".webservers$")
	if err != nil {
		log.Fatal(err)
	}
	for _, section := range sections {
		fmt.Print(section)
	}
	// or
	config.PrintSection("dc1.webservers")

	sections, err = config.Delete("NDB_MGMD DEFAULT")
	if err != nil {
		log.Fatal(err)
	}
	// deleted sections
	for _, section := range sections {
		fmt.Print(section)
	}

	options := section.Options()
	fmt.Println(options["HostName"])

	// save the new config. the original will be renamed to /etc/config.ini.bak
	err = configparser.Save(config, "/etc/config.ini")
	if err != nil {
		log.Fatal(err)
	}
}

Output:

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func Save 

func Save(c *Configuration, filePath string) (err error)

Save the Configuration to file. Creates a backup (.bak) if file already exists.

Types

type Configuration 

type Configuration struct {
	// contains filtered or unexported fields
}

Configuration represents a configuration file with its sections and options.

func NewConfiguration 

func NewConfiguration() *Configuration

NewConfiguration returns a new Configuration instance with an empty file path.

func Read 

func Read(filePath string) (*Configuration, error)

Read parses a specified configuration file and returns a Configuration instance.

func (*Configuration) AllSections 

func (c *Configuration) AllSections() ([]*Section, error)

AllSections returns a slice of all sections available.

func (*Configuration) Delete 

func (c *Configuration) Delete(regex string) (sections []*Section, err error)

Delete deletes the specified sections matched by a regex name and returns the deleted sections.

func (*Configuration) FilePath 

func (c *Configuration) FilePath() string

FilePath returns the configuration file path.

func (*Configuration) Find 

func (c *Configuration) Find(regex string) ([]*Section, error)

Find returns a slice of Sections matching the regexp against the section name.

func (*Configuration) NewSection 

func (c *Configuration) NewSection(fqn string) *Section

NewSection creates and adds a new Section with the specified name.

func (*Configuration) PrintSection 

func (c *Configuration) PrintSection(fqn string)

PrintSection prints a text representation of all sections matching the fully qualified section name.

func (*Configuration) Section 

func (c *Configuration) Section(fqn string) (*Section, error)

Section returns the first section matching the fully qualified section name.

func (*Configuration) Sections 

func (c *Configuration) Sections(fqn string) ([]*Section, error)

Sections returns a slice of Sections matching the fully qualified section name.

func (*Configuration) SetFilePath 

func (c *Configuration) SetFilePath(filePath string)

SetFilePath sets the Configuration file path.

func (*Configuration) String 

func (c *Configuration) String() string

String returns the text representation of a parsed configuration file.

func (*Configuration) StringValue 

func (c *Configuration) StringValue(section, option string) (value string, err error)

StringValue returns the string value for the specified section and option.

type Section 

type Section struct {
	// contains filtered or unexported fields
}

A Section in a configuration

func (*Section) Add 

func (s *Section) Add(option string, value string) (oldValue string)

Add adds a new option to the section. Adding and existing option will overwrite the old one. The old value is returned

func (*Section) Delete 

func (s *Section) Delete(option string) (value string)

Delete removes the specified option from the section and returns the deleted option's value.

func (*Section) Exists 

func (s *Section) Exists(option string) (ok bool)

Exists returns true if the option exists

func (*Section) Name 

func (s *Section) Name() string

Name returns the name of the section

func (*Section) OptionNames 

func (s *Section) OptionNames() []string

OptionNames returns a slice of option names in the same order as they were parsed.

func (*Section) Options 

func (s *Section) Options() map[string]string

Options returns a map of options for the section.

func (*Section) SetValueFor 

func (s *Section) SetValueFor(option string, value string) string

SetValueFor sets the value for the specified option and returns the old value.

func (*Section) String 

func (s *Section) String() string

String returns the text representation of a section with its options.

func (*Section) ValueOf 

func (s *Section) ValueOf(option string) string

ValueOf returns the value of specified option.

Source Files

View all Source files

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