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42 lines
1.0 KiB
Go
42 lines
1.0 KiB
Go
package handler
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import (
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"fmt"
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"net/http"
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"strings"
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"zero/core/breaker"
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"zero/core/logx"
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"zero/core/stat"
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"zero/ngin/internal"
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"zero/ngin/internal/security"
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)
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const breakerSeparator = "://"
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func BreakerHandler(method, path string, metrics *stat.Metrics) func(http.Handler) http.Handler {
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brk := breaker.NewBreaker(breaker.WithName(strings.Join([]string{method, path}, breakerSeparator)))
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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promise, err := brk.Allow()
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if err != nil {
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metrics.AddDrop()
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logx.Errorf("[http] dropped, %s - %s - %s",
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r.RequestURI, internal.GetRemoteAddr(r), r.UserAgent())
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w.WriteHeader(http.StatusServiceUnavailable)
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return
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}
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cw := &security.WithCodeResponseWriter{Writer: w}
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defer func() {
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if cw.Code < http.StatusInternalServerError {
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promise.Accept()
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} else {
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promise.Reject(fmt.Sprintf("%d %s", cw.Code, http.StatusText(cw.Code)))
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}
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}()
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next.ServeHTTP(cw, r)
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})
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}
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}
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