package log
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//go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen
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import (
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"context"
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"reflect"
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"sync"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/log"
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)
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// Instance is a log.Handler that handles logs.
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type Instance struct {
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sync.RWMutex
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config *Config
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accessLogger log.Handler
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errorLogger log.Handler
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followers map[reflect.Value]func(msg log.Message)
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active bool
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}
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// New creates a new log.Instance based on the given config.
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func New(ctx context.Context, config *Config) (*Instance, error) {
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if config.Error == nil {
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config.Error = &LogSpecification{Type: LogType_Console, Level: log.Severity_Warning}
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}
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if config.Access == nil {
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config.Access = &LogSpecification{Type: LogType_None}
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}
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g := &Instance{
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config: config,
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active: false,
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}
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log.RegisterHandler(g)
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// start logger instantly on inited
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// other modules would log during init
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if err := g.startInternal(); err != nil {
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return nil, err
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}
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newError("Logger started").AtDebug().WriteToLog()
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return g, nil
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}
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func (g *Instance) initAccessLogger() error {
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handler, err := createHandler(g.config.Access.Type, HandlerCreatorOptions{
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Path: g.config.Access.Path,
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})
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if err != nil {
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return err
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}
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g.accessLogger = handler
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return nil
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}
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func (g *Instance) initErrorLogger() error {
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handler, err := createHandler(g.config.Error.Type, HandlerCreatorOptions{
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Path: g.config.Error.Path,
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})
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if err != nil {
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return err
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}
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g.errorLogger = handler
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return nil
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}
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// Type implements common.HasType.
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func (*Instance) Type() interface{} {
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return (*Instance)(nil)
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}
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func (g *Instance) startInternal() error {
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g.Lock()
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defer g.Unlock()
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if g.active {
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return nil
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}
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g.active = true
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if err := g.initAccessLogger(); err != nil {
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return newError("failed to initialize access logger").Base(err).AtWarning()
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}
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if err := g.initErrorLogger(); err != nil {
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return newError("failed to initialize error logger").Base(err).AtWarning()
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}
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return nil
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}
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// Start implements common.Runnable.Start().
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func (g *Instance) Start() error {
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return g.startInternal()
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}
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// AddFollower implements log.Follower.
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func (g *Instance) AddFollower(f func(msg log.Message)) {
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g.Lock()
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defer g.Unlock()
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if g.followers == nil {
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g.followers = make(map[reflect.Value]func(msg log.Message))
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}
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g.followers[reflect.ValueOf(f)] = f
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}
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// RemoveFollower implements log.Follower.
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func (g *Instance) RemoveFollower(f func(msg log.Message)) {
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g.Lock()
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defer g.Unlock()
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delete(g.followers, reflect.ValueOf(f))
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}
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// Handle implements log.Handler.
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func (g *Instance) Handle(msg log.Message) {
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g.RLock()
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defer g.RUnlock()
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if !g.active {
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return
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}
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for _, f := range g.followers {
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f(msg)
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}
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switch msg := msg.(type) {
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case *log.AccessMessage:
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if g.accessLogger != nil {
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g.accessLogger.Handle(msg)
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}
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case *log.GeneralMessage:
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if g.errorLogger != nil && msg.Severity <= g.config.Error.Level {
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g.errorLogger.Handle(msg)
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}
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default:
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// Swallow
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}
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}
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// Close implements common.Closable.Close().
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func (g *Instance) Close() error {
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newError("Logger closing").AtDebug().WriteToLog()
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g.Lock()
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defer g.Unlock()
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if !g.active {
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return nil
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}
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g.active = false
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common.Close(g.accessLogger)
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g.accessLogger = nil
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common.Close(g.errorLogger)
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g.errorLogger = nil
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return nil
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}
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func init() {
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common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return New(ctx, config.(*Config))
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}))
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}
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