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middleware.go
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middleware.go
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// Copyright (c) 2022 Gobalsky Labs Limited
//
// Use of this software is governed by the Business Source License included
// in the LICENSE.ZETA file and at https://www.mariadb.com/bsl11.
//
// Change Date: 18 months from the later of the date of the first publicly
// available Distribution of this version of the repository, and 25 June 2022.
//
// On the date above, in accordance with the Business Source License, use
// of this software will be governed by version 3 or later of the GNU General
// Public License.
package rest
import (
"net/http"
"time"
"github.com/zeta-protocol/zeta/core/metrics"
vgcontext "github.com/zeta-protocol/zeta/libs/context"
vfmt "github.com/zeta-protocol/zeta/libs/fmt"
vghttp "github.com/zeta-protocol/zeta/libs/http"
"github.com/zeta-protocol/zeta/logging"
)
// RemoteAddrMiddleware is a middleware adding to the current request context the
// address of the caller.
func RemoteAddrMiddleware(log *logging.Logger, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ip, err := vghttp.RemoteAddr(r)
if err != nil {
log.Debug("Failed to get remote address in middleware",
logging.String("remote-addr", r.RemoteAddr),
logging.String("x-forwarded-for", vfmt.Escape(r.Header.Get("X-Forwarded-For"))),
)
} else {
r = r.WithContext(vgcontext.WithRemoteIPAddr(r.Context(), ip))
}
next.ServeHTTP(w, r)
})
}
// MetricCollectionMiddleware records the request and the time taken to service it.
func MetricCollectionMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
start := time.Now()
next.ServeHTTP(w, r)
end := time.Now()
// Update the call count and timings in metrics
timetaken := end.Sub(start)
metrics.APIRequestAndTimeREST(r.Method, r.RequestURI, timetaken.Seconds())
})
}