gcfg

package
v2.0.0-...-bbb9e3c Latest Latest
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 Go to latest Published: Mar 7, 2023 License: MIT Imports: 21 Imported by: 5

Documentation

Overview

Package gcfg provides reading, caching and managing for configuration.

Index

Examples

Constants

View Source 
const (
	DefaultInstanceName   = "config" // DefaultName is the default instance name for instance usage.
	DefaultConfigFileName = "config" // DefaultConfigFile is the default configuration file name.
)

Variables

This section is empty.

Functions

This section is empty.

Types

type Adapter 

type Adapter interface {
	// Available checks and returns the backend configuration service is available.
	// The optional parameter `resource` specifies certain configuration resource.
	//
	// Note that this function does not return error as it just does simply check for
	// backend configuration service.
	Available(ctx context.Context, resource ...string) (ok bool)

	// Get retrieves and returns value by specified `pattern` in current resource.
	// Pattern like:
	// "x.y.z" for map item.
	// "x.0.y" for slice item.
	Get(ctx context.Context, pattern string) (value interface{}, err error)

	// Data retrieves and returns all configuration data in current resource as map.
	// Note that this function may lead lots of memory usage if configuration data is too large,
	// you can implement this function if necessary.
	Data(ctx context.Context) (data map[string]interface{}, err error)
}

Adapter is the interface for configuration retrieving.

type AdapterFile 

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

func NewAdapterFile 

func NewAdapterFile(file ...string) (*AdapterFile, error)

NewAdapterFile returns a new configuration management object. The parameter `file` specifies the default configuration file name for reading.

func (*AdapterFile) AddPath 

func (c *AdapterFile) AddPath(paths ...string) (err error)

AddPath adds an absolute or relative path to the search paths.

func (*AdapterFile) Available 

func (c *AdapterFile) Available(ctx context.Context, fileName ...string) bool

Available checks and returns whether configuration of given `file` is available.

func (*AdapterFile) Clear 

func (c *AdapterFile) Clear()

Clear removes all parsed configuration files content cache, which will force reload configuration content from file.

func (*AdapterFile) ClearContent 

func (c *AdapterFile) ClearContent()

ClearContent removes all global configuration contents.

func (*AdapterFile) Data 

func (c *AdapterFile) Data(ctx context.Context) (data map[string]interface{}, err error)

Data retrieves and returns all configuration data as map type.

func (*AdapterFile) Dump 

func (c *AdapterFile) Dump()

Dump prints current Json object with more manually readable.

func (*AdapterFile) Get 

func (c *AdapterFile) Get(ctx context.Context, pattern string) (value interface{}, err error)

Get retrieves and returns value by specified `pattern`. It returns all values of current Json object if `pattern` is given empty or string ".". It returns nil if no value found by `pattern`.

We can also access slice item by its index number in `pattern` like: "list.10", "array.0.name", "array.0.1.id".

It returns a default value specified by `def` if value for `pattern` is not found.

func (*AdapterFile) GetContent 

func (c *AdapterFile) GetContent(file ...string) string

GetContent returns customized configuration content for specified `file`. The `file` is unnecessary param, default is DefaultConfigFile.

func (*AdapterFile) GetFileName 

func (c *AdapterFile) GetFileName() string

GetFileName returns the default configuration file name.

func (*AdapterFile) GetFilePath 

func (c *AdapterFile) GetFilePath(fileName ...string) (path string, err error)

GetFilePath returns the absolute configuration file path for the given filename by `file`. If `file` is not passed, it returns the configuration file path of the default name. It returns an empty `path` string and an error if the given `file` does not exist.

func (*AdapterFile) GetPaths 

func (c *AdapterFile) GetPaths() []string

GetPaths returns the searching path array of current configuration manager.

func (*AdapterFile) MustGet 

func (c *AdapterFile) MustGet(ctx context.Context, pattern string) *gvar.Var

MustGet acts as function Get, but it panics if error occurs.

func (*AdapterFile) RemoveContent 

func (c *AdapterFile) RemoveContent(file ...string)

RemoveContent removes the global configuration with specified `file`. If `name` is not passed, it removes configuration of the default group name.

func (*AdapterFile) Set 

func (c *AdapterFile) Set(pattern string, value interface{}) error

Set sets value with specified `pattern`. It supports hierarchical data access by char separator, which is '.' in default. It is commonly used for updates certain configuration value in runtime. Note that, it is not recommended using `Set` configuration at runtime as the configuration would be automatically refreshed if underlying configuration file changed.

func (*AdapterFile) SetContent 

func (c *AdapterFile) SetContent(content string, file ...string)

SetContent sets customized configuration content for specified `file`. The `file` is unnecessary param, default is DefaultConfigFile.

func (*AdapterFile) SetFileName 

func (c *AdapterFile) SetFileName(name string)

SetFileName sets the default configuration file name.

func (*AdapterFile) SetPath 

func (c *AdapterFile) SetPath(path string) (err error)

SetPath sets the configuration directory path for file search. The parameter `path` can be absolute or relative path, but absolute path is strongly recommended.

func (*AdapterFile) SetViolenceCheck 

func (c *AdapterFile) SetViolenceCheck(check bool)

SetViolenceCheck sets whether to perform hierarchical conflict checking. This feature needs to be enabled when there is a level symbol in the key name. It is off in default.

Note that, turning on this feature is quite expensive, and it is not recommended allowing separators in the key names. It is best to avoid this on the application side.

type Config 

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

Config is the configuration management object.

func Instance 

func Instance(name ...string) *Config

Instance returns an instance of Config with default settings. The parameter `name` is the name for the instance. But very note that, if the file "name.toml" exists in the configuration directory, it then sets it as the default configuration file. The toml file type is the default configuration file type.

func New 

func New() (*Config, error)

New creates and returns a Config object with default adapter of AdapterFile.

func NewWithAdapter 

func NewWithAdapter(adapter Adapter) *Config

NewWithAdapter creates and returns a Config object with given adapter.

func (*Config) Available 

func (c *Config) Available(ctx context.Context, resource ...string) (ok bool)

Available checks and returns the configuration service is available. The optional parameter `pattern` specifies certain configuration resource.

It returns true if configuration file is present in default AdapterFile, or else false. Note that this function does not return error as it just does simply check for backend configuration service.

func (*Config) Data 

func (c *Config) Data(ctx context.Context) (data map[string]interface{}, err error)

Data retrieves and returns all configuration data as map type.

func (*Config) Get 

func (c *Config) Get(ctx context.Context, pattern string, def ...interface{}) (*gvar.Var, error)

Get retrieves and returns value by specified `pattern`. It returns all values of current Json object if `pattern` is given empty or string ".". It returns nil if no value found by `pattern`.

It returns a default value specified by `def` if value for `pattern` is not found.

func (*Config) GetAdapter 

func (c *Config) GetAdapter() Adapter

GetAdapter returns the adapter of current Config object.

func (*Config) GetWithCmd 

func (c *Config) GetWithCmd(ctx context.Context, pattern string, def ...interface{}) (*gvar.Var, error)

GetWithCmd returns the configuration value specified by pattern `pattern`. If the configuration value does not exist, then it retrieves and returns the command line option specified by `key`. It returns the default value `def` if none of them exists.

Fetching Rules: Command line arguments are in lowercase format, eg: gf.package.variable.

Example 
package main

import (
	"fmt"
	"os"

	"github.com/wowqhb/gf/v2/frame/g"
	"github.com/wowqhb/gf/v2/os/gcmd"
	"github.com/wowqhb/gf/v2/os/gctx"
)

func main() {
	var (
		key = `cmd.test`
		ctx = gctx.New()
	)
	v, err := g.Cfg().GetWithCmd(ctx, key)
	if err != nil {
		panic(err)
	}
	fmt.Printf("cmd:%s\n", v)
	// Re-Initialize custom command arguments.
	os.Args = append(os.Args, fmt.Sprintf(`--%s=yes`, key))
	gcmd.Init(os.Args...)
	// Retrieve the configuration and command option again.
	v, err = g.Cfg().GetWithCmd(ctx, key)
	if err != nil {
		panic(err)
	}
	fmt.Printf("cmd:%s", v)

}

Output:

cmd:
cmd:yes

func (*Config) GetWithEnv 

func (c *Config) GetWithEnv(ctx context.Context, pattern string, def ...interface{}) (*gvar.Var, error)

GetWithEnv returns the configuration value specified by pattern `pattern`. If the configuration value does not exist, then it retrieves and returns the environment value specified by `key`. It returns the default value `def` if none of them exists.

Fetching Rules: Environment arguments are in uppercase format, eg: GF_PACKAGE_VARIABLE.

Example 
package main

import (
	"fmt"

	"github.com/wowqhb/gf/v2/frame/g"
	"github.com/wowqhb/gf/v2/os/gctx"
	"github.com/wowqhb/gf/v2/os/genv"
)

func main() {
	var (
		key = `ENV_TEST`
		ctx = gctx.New()
	)
	v, err := g.Cfg().GetWithEnv(ctx, key)
	if err != nil {
		panic(err)
	}
	fmt.Printf("env:%s\n", v)
	if err = genv.Set(key, "gf"); err != nil {
		panic(err)
	}
	v, err = g.Cfg().GetWithEnv(ctx, key)
	if err != nil {
		panic(err)
	}
	fmt.Printf("env:%s", v)

}

Output:

env:
env:gf

func (*Config) MustData 

func (c *Config) MustData(ctx context.Context) map[string]interface{}

MustData acts as function Data, but it panics if error occurs.

func (*Config) MustGet 

func (c *Config) MustGet(ctx context.Context, pattern string, def ...interface{}) *gvar.Var

MustGet acts as function Get, but it panics if error occurs.

func (*Config) MustGetWithCmd 

func (c *Config) MustGetWithCmd(ctx context.Context, pattern string, def ...interface{}) *gvar.Var

MustGetWithCmd acts as function GetWithCmd, but it panics if error occurs.

func (*Config) MustGetWithEnv 

func (c *Config) MustGetWithEnv(ctx context.Context, pattern string, def ...interface{}) *gvar.Var

MustGetWithEnv acts as function GetWithEnv, but it panics if error occurs.

func (*Config) SetAdapter 

func (c *Config) SetAdapter(adapter Adapter)

SetAdapter sets the adapter of current Config object.

Source Files

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