315 lines
11 KiB
Go
315 lines
11 KiB
Go
package middleware
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import (
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"errors"
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"github.com/labstack/echo/v4"
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"net/http"
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"time"
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)
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// Example for `fmt.Printf`
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// e.Use(middleware.RequestLoggerWithConfig(middleware.RequestLoggerConfig{
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// LogStatus: true,
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// LogURI: true,
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// LogValuesFunc: func(c echo.Context, v middleware.RequestLoggerValues) error {
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// fmt.Printf("REQUEST: uri: %v, status: %v\n", v.URI, v.Status)
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// return nil
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// },
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// }))
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//
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// Example for Zerolog (https://github.com/rs/zerolog)
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// logger := zerolog.New(os.Stdout)
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// e.Use(middleware.RequestLoggerWithConfig(middleware.RequestLoggerConfig{
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// LogURI: true,
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// LogStatus: true,
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// LogValuesFunc: func(c echo.Context, v middleware.RequestLoggerValues) error {
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// logger.Info().
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// Str("URI", v.URI).
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// Int("status", v.Status).
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// Msg("request")
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//
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// return nil
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// },
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// }))
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//
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// Example for Zap (https://github.com/uber-go/zap)
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// logger, _ := zap.NewProduction()
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// e.Use(middleware.RequestLoggerWithConfig(middleware.RequestLoggerConfig{
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// LogURI: true,
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// LogStatus: true,
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// LogValuesFunc: func(c echo.Context, v middleware.RequestLoggerValues) error {
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// logger.Info("request",
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// zap.String("URI", v.URI),
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// zap.Int("status", v.Status),
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// )
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//
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// return nil
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// },
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// }))
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//
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// Example for Logrus (https://github.com/sirupsen/logrus)
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// log := logrus.New()
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// e.Use(middleware.RequestLoggerWithConfig(middleware.RequestLoggerConfig{
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// LogURI: true,
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// LogStatus: true,
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// LogValuesFunc: func(c echo.Context, values middleware.RequestLoggerValues) error {
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// log.WithFields(logrus.Fields{
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// "URI": values.URI,
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// "status": values.Status,
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// }).Info("request")
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//
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// return nil
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// },
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// }))
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// RequestLoggerConfig is configuration for Request Logger middleware.
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type RequestLoggerConfig struct {
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// Skipper defines a function to skip middleware.
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Skipper Skipper
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// BeforeNextFunc defines a function that is called before next middleware or handler is called in chain.
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BeforeNextFunc func(c echo.Context)
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// LogValuesFunc defines a function that is called with values extracted by logger from request/response.
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// Mandatory.
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LogValuesFunc func(c echo.Context, v RequestLoggerValues) error
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// LogLatency instructs logger to record duration it took to execute rest of the handler chain (next(c) call).
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LogLatency bool
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// LogProtocol instructs logger to extract request protocol (i.e. `HTTP/1.1` or `HTTP/2`)
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LogProtocol bool
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// LogRemoteIP instructs logger to extract request remote IP. See `echo.Context.RealIP()` for implementation details.
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LogRemoteIP bool
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// LogHost instructs logger to extract request host value (i.e. `example.com`)
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LogHost bool
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// LogMethod instructs logger to extract request method value (i.e. `GET` etc)
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LogMethod bool
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// LogURI instructs logger to extract request URI (i.e. `/list?lang=en&page=1`)
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LogURI bool
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// LogURIPath instructs logger to extract request URI path part (i.e. `/list`)
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LogURIPath bool
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// LogRoutePath instructs logger to extract route path part to which request was matched to (i.e. `/user/:id`)
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LogRoutePath bool
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// LogRequestID instructs logger to extract request ID from request `X-Request-ID` header or response if request did not have value.
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LogRequestID bool
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// LogReferer instructs logger to extract request referer values.
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LogReferer bool
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// LogUserAgent instructs logger to extract request user agent values.
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LogUserAgent bool
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// LogStatus instructs logger to extract response status code. If handler chain returns an echo.HTTPError,
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// the status code is extracted from the echo.HTTPError returned
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LogStatus bool
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// LogError instructs logger to extract error returned from executed handler chain.
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LogError bool
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// LogContentLength instructs logger to extract content length header value. Note: this value could be different from
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// actual request body size as it could be spoofed etc.
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LogContentLength bool
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// LogResponseSize instructs logger to extract response content length value. Note: when used with Gzip middleware
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// this value may not be always correct.
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LogResponseSize bool
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// LogHeaders instructs logger to extract given list of headers from request. Note: request can contain more than
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// one header with same value so slice of values is been logger for each given header.
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//
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// Note: header values are converted to canonical form with http.CanonicalHeaderKey as this how request parser converts header
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// names to. For example, the canonical key for "accept-encoding" is "Accept-Encoding".
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LogHeaders []string
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// LogQueryParams instructs logger to extract given list of query parameters from request URI. Note: request can
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// contain more than one query parameter with same name so slice of values is been logger for each given query param name.
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LogQueryParams []string
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// LogFormValues instructs logger to extract given list of form values from request body+URI. Note: request can
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// contain more than one form value with same name so slice of values is been logger for each given form value name.
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LogFormValues []string
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timeNow func() time.Time
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}
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// RequestLoggerValues contains extracted values from logger.
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type RequestLoggerValues struct {
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// StartTime is time recorded before next middleware/handler is executed.
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StartTime time.Time
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// Latency is duration it took to execute rest of the handler chain (next(c) call).
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Latency time.Duration
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// Protocol is request protocol (i.e. `HTTP/1.1` or `HTTP/2`)
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Protocol string
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// RemoteIP is request remote IP. See `echo.Context.RealIP()` for implementation details.
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RemoteIP string
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// Host is request host value (i.e. `example.com`)
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Host string
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// Method is request method value (i.e. `GET` etc)
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Method string
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// URI is request URI (i.e. `/list?lang=en&page=1`)
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URI string
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// URIPath is request URI path part (i.e. `/list`)
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URIPath string
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// RoutePath is route path part to which request was matched to (i.e. `/user/:id`)
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RoutePath string
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// RequestID is request ID from request `X-Request-ID` header or response if request did not have value.
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RequestID string
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// Referer is request referer values.
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Referer string
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// UserAgent is request user agent values.
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UserAgent string
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// Status is response status code. Then handler returns an echo.HTTPError then code from there.
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Status int
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// Error is error returned from executed handler chain.
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Error error
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// ContentLength is content length header value. Note: this value could be different from actual request body size
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// as it could be spoofed etc.
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ContentLength string
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// ResponseSize is response content length value. Note: when used with Gzip middleware this value may not be always correct.
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ResponseSize int64
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// Headers are list of headers from request. Note: request can contain more than one header with same value so slice
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// of values is been logger for each given header.
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// Note: header values are converted to canonical form with http.CanonicalHeaderKey as this how request parser converts header
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// names to. For example, the canonical key for "accept-encoding" is "Accept-Encoding".
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Headers map[string][]string
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// QueryParams are list of query parameters from request URI. Note: request can contain more than one query parameter
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// with same name so slice of values is been logger for each given query param name.
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QueryParams map[string][]string
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// FormValues are list of form values from request body+URI. Note: request can contain more than one form value with
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// same name so slice of values is been logger for each given form value name.
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FormValues map[string][]string
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}
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// RequestLoggerWithConfig returns a RequestLogger middleware with config.
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func RequestLoggerWithConfig(config RequestLoggerConfig) echo.MiddlewareFunc {
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mw, err := config.ToMiddleware()
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if err != nil {
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panic(err)
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}
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return mw
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}
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// ToMiddleware converts RequestLoggerConfig into middleware or returns an error for invalid configuration.
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func (config RequestLoggerConfig) ToMiddleware() (echo.MiddlewareFunc, error) {
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if config.Skipper == nil {
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config.Skipper = DefaultSkipper
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}
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now = time.Now
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if config.timeNow != nil {
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now = config.timeNow
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}
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if config.LogValuesFunc == nil {
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return nil, errors.New("missing LogValuesFunc callback function for request logger middleware")
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}
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logHeaders := len(config.LogHeaders) > 0
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headers := append([]string(nil), config.LogHeaders...)
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for i, v := range headers {
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headers[i] = http.CanonicalHeaderKey(v)
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}
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logQueryParams := len(config.LogQueryParams) > 0
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logFormValues := len(config.LogFormValues) > 0
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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if config.Skipper(c) {
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return next(c)
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}
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req := c.Request()
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res := c.Response()
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start := now()
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if config.BeforeNextFunc != nil {
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config.BeforeNextFunc(c)
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}
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err := next(c)
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v := RequestLoggerValues{
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StartTime: start,
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}
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if config.LogLatency {
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v.Latency = now().Sub(start)
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}
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if config.LogProtocol {
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v.Protocol = req.Proto
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}
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if config.LogRemoteIP {
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v.RemoteIP = c.RealIP()
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}
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if config.LogHost {
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v.Host = req.Host
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}
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if config.LogMethod {
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v.Method = req.Method
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}
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if config.LogURI {
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v.URI = req.RequestURI
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}
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if config.LogURIPath {
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p := req.URL.Path
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if p == "" {
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p = "/"
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}
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v.URIPath = p
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}
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if config.LogRoutePath {
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v.RoutePath = c.Path()
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}
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if config.LogRequestID {
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id := req.Header.Get(echo.HeaderXRequestID)
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if id == "" {
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id = res.Header().Get(echo.HeaderXRequestID)
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}
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v.RequestID = id
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}
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if config.LogReferer {
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v.Referer = req.Referer()
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}
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if config.LogUserAgent {
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v.UserAgent = req.UserAgent()
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}
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if config.LogStatus {
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v.Status = res.Status
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if err != nil {
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if httpErr, ok := err.(*echo.HTTPError); ok {
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v.Status = httpErr.Code
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}
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}
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}
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if config.LogError && err != nil {
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v.Error = err
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}
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if config.LogContentLength {
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v.ContentLength = req.Header.Get(echo.HeaderContentLength)
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}
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if config.LogResponseSize {
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v.ResponseSize = res.Size
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}
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if logHeaders {
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v.Headers = map[string][]string{}
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for _, header := range headers {
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if values, ok := req.Header[header]; ok {
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v.Headers[header] = values
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}
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}
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}
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if logQueryParams {
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queryParams := c.QueryParams()
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v.QueryParams = map[string][]string{}
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for _, param := range config.LogQueryParams {
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if values, ok := queryParams[param]; ok {
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v.QueryParams[param] = values
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}
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}
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}
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if logFormValues {
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v.FormValues = map[string][]string{}
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for _, formValue := range config.LogFormValues {
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if values, ok := req.Form[formValue]; ok {
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v.FormValues[formValue] = values
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}
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}
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}
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if errOnLog := config.LogValuesFunc(c, v); errOnLog != nil {
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return errOnLog
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}
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return err
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}
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}, nil
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}
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