mirror of
https://github.com/labstack/echo.git
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135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
package middleware
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import (
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"fmt"
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"net/http"
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"runtime"
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"github.com/labstack/echo/v4"
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"github.com/labstack/gommon/log"
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)
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type (
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// LogErrorFunc defines a function for custom logging in the middleware.
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LogErrorFunc func(c echo.Context, err error, stack []byte) error
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// RecoverConfig defines the config for Recover middleware.
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RecoverConfig struct {
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// Skipper defines a function to skip middleware.
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Skipper Skipper
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// Size of the stack to be printed.
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// Optional. Default value 4KB.
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StackSize int `yaml:"stack_size"`
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// DisableStackAll disables formatting stack traces of all other goroutines
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// into buffer after the trace for the current goroutine.
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// Optional. Default value false.
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DisableStackAll bool `yaml:"disable_stack_all"`
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// DisablePrintStack disables printing stack trace.
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// Optional. Default value as false.
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DisablePrintStack bool `yaml:"disable_print_stack"`
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// LogLevel is log level to printing stack trace.
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// Optional. Default value 0 (Print).
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LogLevel log.Lvl
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// LogErrorFunc defines a function for custom logging in the middleware.
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// If it's set you don't need to provide LogLevel for config.
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// If this function returns nil, the centralized HTTPErrorHandler will not be called.
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LogErrorFunc LogErrorFunc
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// DisableErrorHandler disables the call to centralized HTTPErrorHandler.
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// The recovered error is then passed back to upstream middleware, instead of swallowing the error.
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// Optional. Default value false.
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DisableErrorHandler bool `yaml:"disable_error_handler"`
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}
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)
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var (
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// DefaultRecoverConfig is the default Recover middleware config.
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DefaultRecoverConfig = RecoverConfig{
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Skipper: DefaultSkipper,
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StackSize: 4 << 10, // 4 KB
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DisableStackAll: false,
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DisablePrintStack: false,
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LogLevel: 0,
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LogErrorFunc: nil,
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DisableErrorHandler: false,
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}
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)
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// Recover returns a middleware which recovers from panics anywhere in the chain
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// and handles the control to the centralized HTTPErrorHandler.
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func Recover() echo.MiddlewareFunc {
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return RecoverWithConfig(DefaultRecoverConfig)
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}
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// RecoverWithConfig returns a Recover middleware with config.
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// See: `Recover()`.
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func RecoverWithConfig(config RecoverConfig) echo.MiddlewareFunc {
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// Defaults
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if config.Skipper == nil {
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config.Skipper = DefaultRecoverConfig.Skipper
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}
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if config.StackSize == 0 {
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config.StackSize = DefaultRecoverConfig.StackSize
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}
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) (returnErr error) {
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if config.Skipper(c) {
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return next(c)
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}
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defer func() {
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if r := recover(); r != nil {
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if r == http.ErrAbortHandler {
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panic(r)
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}
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err, ok := r.(error)
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if !ok {
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err = fmt.Errorf("%v", r)
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}
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var stack []byte
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var length int
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if !config.DisablePrintStack {
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stack = make([]byte, config.StackSize)
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length = runtime.Stack(stack, !config.DisableStackAll)
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stack = stack[:length]
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}
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if config.LogErrorFunc != nil {
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err = config.LogErrorFunc(c, err, stack)
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} else if !config.DisablePrintStack {
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msg := fmt.Sprintf("[PANIC RECOVER] %v %s\n", err, stack[:length])
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switch config.LogLevel {
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case log.DEBUG:
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c.Logger().Debug(msg)
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case log.INFO:
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c.Logger().Info(msg)
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case log.WARN:
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c.Logger().Warn(msg)
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case log.ERROR:
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c.Logger().Error(msg)
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case log.OFF:
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// None.
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default:
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c.Logger().Print(msg)
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}
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}
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if err != nil && !config.DisableErrorHandler {
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c.Error(err)
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} else {
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returnErr = err
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}
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}
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}()
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return next(c)
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}
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}
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}
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