8756ea717d
Create a custom middleware function to measure 5xx requests for all composer & worker routes and not just the `/composer` endpoint. The result is a prometheus metric that contains info on the request status code, path & method. A helper function has been added to clean the dynamic parameters in the path routes to reduce metric cardinality
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
package prometheus
|
|
|
|
import (
|
|
"errors"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/labstack/echo/v4"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
func MetricsMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
|
|
return func(ctx echo.Context) error {
|
|
TotalRequests.Inc()
|
|
if strings.HasSuffix(ctx.Path(), "/compose") {
|
|
ComposeRequests.Inc()
|
|
}
|
|
timer := prometheus.NewTimer(httpDuration.WithLabelValues(ctx.Path()))
|
|
defer timer.ObserveDuration()
|
|
return next(ctx)
|
|
}
|
|
}
|
|
|
|
func StatusMiddleware(subsystem string) func(next echo.HandlerFunc) echo.HandlerFunc {
|
|
counter := StatusRequestsCounter(subsystem)
|
|
return func(next echo.HandlerFunc) echo.HandlerFunc {
|
|
return func(ctx echo.Context) error {
|
|
|
|
// call the next handler to see if
|
|
// an error occurred, see:
|
|
// - https://github.com/labstack/echo/issues/1837#issuecomment-816399630
|
|
// - https://github.com/labstack/echo/discussions/1820#discussioncomment-529428
|
|
err := next(ctx)
|
|
|
|
path := pathLabel(ctx.Path())
|
|
method := ctx.Request().Method
|
|
status := ctx.Response().Status
|
|
|
|
httpErr := new(echo.HTTPError)
|
|
if errors.As(err, &httpErr) {
|
|
status = httpErr.Code
|
|
}
|
|
|
|
counter.WithLabelValues(
|
|
method,
|
|
path,
|
|
strconv.Itoa(status),
|
|
subsystem,
|
|
).Inc()
|
|
|
|
return err
|
|
}
|
|
}
|
|
}
|