eth-statediff-service/pkg/prom/middleware.go

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2021-10-25 20:39:39 +00:00
// VulcanizeDB
// Copyright © 2020 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package prom
import (
"net/http"
"time"
"github.com/ethereum/go-ethereum/rpc"
)
// HTTPMiddleware http connection metric reader
func HTTPMiddleware(next http.Handler) http.Handler {
if !metrics {
return next
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
httpCount.Inc()
start := time.Now()
next.ServeHTTP(w, r)
duration := time.Now().Sub(start)
httpDuration.Observe(float64(duration.Seconds()))
})
}
// IPCMiddleware unix-socket connection counter
func IPCMiddleware(server *rpc.Server, client rpc.Conn) {
if metrics {
ipcCount.Inc()
}
server.ServeCodec(rpc.NewCodec(client), 0)
if metrics {
ipcCount.Dec()
}
}