config

package
v3.9.15 Latest Latest
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 Go to latest Published: Nov 28, 2022 License: Apache-2.0 Imports: 12 Imported by: 14

Documentation

Overview

Package config is an interface for dynamic configuration.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrCodecMissing is returned when codec needed and not specified
	ErrCodecMissing = errors.New("codec missing")
	// ErrInvalidStruct is returned when the target struct is invalid
	ErrInvalidStruct = errors.New("invalid struct specified")
	// ErrWatcherStopped is returned when source watcher has been stopped
	ErrWatcherStopped = errors.New("watcher stopped")
	// ErrWatcherNotImplemented returned when config does not implement watch
	ErrWatcherNotImplemented = errors.New("watcher not implemented")
)
View Source 
var (
	// DefaultAfterLoad default func that runs after config load
	DefaultAfterLoad = func(ctx context.Context, c Config) error {
		for _, fn := range c.Options().AfterLoad {
			if err := fn(ctx, c); err != nil {
				c.Options().Logger.Errorf(ctx, "%s AfterLoad err: %v", c.String(), err)
				if !c.Options().AllowFail {
					return err
				}
			}
		}
		return nil
	}
	// DefaultAfterSave default func that runs after config save
	DefaultAfterSave = func(ctx context.Context, c Config) error {
		for _, fn := range c.Options().AfterSave {
			if err := fn(ctx, c); err != nil {
				c.Options().Logger.Errorf(ctx, "%s AfterSave err: %v", c.String(), err)
				if !c.Options().AllowFail {
					return err
				}
			}
		}
		return nil
	}
	// DefaultBeforeLoad default func that runs before config load
	DefaultBeforeLoad = func(ctx context.Context, c Config) error {
		for _, fn := range c.Options().BeforeLoad {
			if err := fn(ctx, c); err != nil {
				c.Options().Logger.Errorf(ctx, "%s BeforeLoad err: %v", c.String(), err)
				if !c.Options().AllowFail {
					return err
				}
			}
		}
		return nil
	}
	// DefaultBeforeSave default func that runs befora config save
	DefaultBeforeSave = func(ctx context.Context, c Config) error {
		for _, fn := range c.Options().BeforeSave {
			if err := fn(ctx, c); err != nil {
				c.Options().Logger.Errorf(ctx, "%s BeforeSave err: %v", c.String(), err)
				if !c.Options().AllowFail {
					return err
				}
			}
		}
		return nil
	}
)
View Source 
var DefaultConfig = NewConfig()

DefaultConfig default config

View Source 
var DefaultWatcherMaxInterval = 9 * time.Second

DefaultWatcherMaxInterval default max interval for poll changes

View Source 
var DefaultWatcherMinInterval = 5 * time.Second

DefaultWatcherMinInterval default min interval for poll changes

Functions

func Load 

func Load(ctx context.Context, cs []Config, opts ...LoadOption) error

Load loads config from config sources

func NewContext 

func NewContext(ctx context.Context, c Config) context.Context

NewContext put store in context

func Validate added in v3.9.1 

func Validate(ctx context.Context, cfg interface{}) error

Validate runs Validate() error func for each struct field

Types

type Config 

type Config interface {
	// Name returns name of config
	Name() string
	// Init the config
	Init(opts ...Option) error
	// Options in the config
	Options() Options
	// Load config from sources
	Load(context.Context, ...LoadOption) error
	// Save config to sources
	Save(context.Context, ...SaveOption) error
	// Watch a config for changes
	Watch(context.Context, ...WatchOption) (Watcher, error)
	// String returns config type name
	String() string
}

Config is an interface abstraction for dynamic configuration

func FromContext 

func FromContext(ctx context.Context) (Config, bool)

FromContext returns store from context

func NewConfig 

func NewConfig(opts ...Option) Config

NewConfig returns new default config source

type LoadOption 

type LoadOption func(o *LoadOptions)

LoadOption function signature

func LoadAppend 

func LoadAppend(b bool) LoadOption

LoadAppend override values when load

func LoadOverride 

func LoadOverride(b bool) LoadOption

LoadOverride override values when load

func LoadStruct 

func LoadStruct(src interface{}) LoadOption

LoadStruct override struct for loading

func SetLoadOption added in v3.8.8 

func SetLoadOption(k, v interface{}) LoadOption

SetLoadOption returns a function to setup a context with given value

type LoadOptions 

type LoadOptions struct {
	Struct   interface{}
	Override bool
	Append   bool
	Context  context.Context
}

LoadOptions struct

func NewLoadOptions 

func NewLoadOptions(opts ...LoadOption) LoadOptions

NewLoadOptions create LoadOptions struct with provided opts

type Option 

type Option func(o *Options)

Option function signature

func AfterLoad 

func AfterLoad(fn ...func(context.Context, Config) error) Option

AfterLoad run funcs after config load

func AfterSave 

func AfterSave(fn ...func(context.Context, Config) error) Option

AfterSave run fncs after save

func AllowFail 

func AllowFail(b bool) Option

AllowFail allows config source to fail

func BeforeLoad 

func BeforeLoad(fn ...func(context.Context, Config) error) Option

BeforeLoad run funcs before config load

func BeforeSave 

func BeforeSave(fn ...func(context.Context, Config) error) Option

BeforeSave run funcs before save

func Codec 

func Codec(c codec.Codec) Option

Codec sets the source codec

func Context 

func Context(ctx context.Context) Option

Context pass context

func Logger 

func Logger(l logger.Logger) Option

Logger sets the logger

func Name 

func Name(n string) Option

Name sets the name

func SetOption 

func SetOption(k, v interface{}) Option

SetOption returns a function to setup a context with given value

func Struct 

func Struct(v interface{}) Option

Struct used as config

func StructTag 

func StructTag(name string) Option

StructTag sets the struct tag that used for filling

func Tracer 

func Tracer(t tracer.Tracer) Option

Tracer to be used for tracing

type Options 

type Options struct {
	// Struct holds the destination config struct
	Struct interface{}
	// Codec that used for load/save
	Codec codec.Codec
	// Tracer that will be used
	Tracer tracer.Tracer
	// Meter that will be used
	Meter meter.Meter
	// Logger that will be used
	Logger logger.Logger
	// Context used for external options
	Context context.Context
	// Name of the config
	Name string
	// StructTag name
	StructTag string
	// BeforeSave contains slice of funcs that runs before save
	BeforeSave []func(context.Context, Config) error
	// AfterLoad contains slice of funcs that runs after load
	AfterLoad []func(context.Context, Config) error
	// BeforeLoad contains slice of funcs that runs before load
	BeforeLoad []func(context.Context, Config) error
	// AfterSave contains slice of funcs that runs after save
	AfterSave []func(context.Context, Config) error
	// AllowFail flag to allow fail in config source
	AllowFail bool
}

Options hold the config options

func NewOptions 

func NewOptions(opts ...Option) Options

NewOptions new options struct with filed values

type SaveOption 

type SaveOption func(o *SaveOptions)

SaveOption function signature

func SaveStruct 

func SaveStruct(src interface{}) SaveOption

SaveStruct override struct for save to config

func SetSaveOption added in v3.8.8 

func SetSaveOption(k, v interface{}) SaveOption

SetSaveOption returns a function to setup a context with given value

type SaveOptions 

type SaveOptions struct {
	Struct  interface{}
	Context context.Context
}

SaveOptions struct

func NewSaveOptions 

func NewSaveOptions(opts ...SaveOption) SaveOptions

NewSaveOptions fill SaveOptions struct

type Validator added in v3.9.1 

type Validator interface {
	Validate() error
}

type WatchOption 

type WatchOption func(*WatchOptions)

WatchOption func signature

func SetWatchOption added in v3.8.9 

func SetWatchOption(k, v interface{}) WatchOption

SetWatchOption returns a function to setup a context with given value

func WatchCoalesce 

func WatchCoalesce(b bool) WatchOption

WatchCoalesce controls watch event combining

func WatchContext 

func WatchContext(ctx context.Context) WatchOption

WatchContext pass context

func WatchInterval 

func WatchInterval(min, max time.Duration) WatchOption

WatchInterval specifies min and max time.Duration for pulling changes

func WatchStruct 

func WatchStruct(src interface{}) WatchOption

WatchStruct overrides struct for fill

type WatchOptions 

type WatchOptions struct {
	// Context used by non default options
	Context context.Context
	// Struct for filling
	Struct interface{}
	// MinInterval specifies the min time.Duration interval for poll changes
	MinInterval time.Duration
	// MaxInterval specifies the max time.Duration interval for poll changes
	MaxInterval time.Duration
	// Coalesce multiple events to one
	Coalesce bool
}

WatchOptions struuct

func NewWatchOptions 

func NewWatchOptions(opts ...WatchOption) WatchOptions

NewWatchOptions create WatchOptions struct with provided opts

type Watcher 

type Watcher interface {
	// Next blocks until update happens or error returned
	Next() (map[string]interface{}, error)
	// Stop stops watcher
	Stop() error
}

Watcher is the config watcher

Source Files

View all Source files

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