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server.go
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server.go
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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package status
import (
"bytes"
"context"
"net/http"
"github.com/ServiceWeaver/weaver/internal/logtype"
imetrics "github.com/ServiceWeaver/weaver/internal/metrics"
"github.com/ServiceWeaver/weaver/runtime/metrics"
"github.com/ServiceWeaver/weaver/runtime/protomsg"
protos "github.com/ServiceWeaver/weaver/runtime/protos"
)
const (
statusEndpoint = "/debug/serviceweaver/status"
metricsEndpoint = "/debug/serviceweaver/metrics"
prometheusEndpoint = "/debug/serviceweaver/prometheus"
profileEndpoint = "/debug/serviceweaver/profile"
)
// A Server returns information about a Service Weaver deployment.
type Server interface {
// Status returns the status of the deployment.
Status(context.Context) (*Status, error)
// Metrics returns a snapshot of the deployment's metrics.
Metrics(context.Context) (*Metrics, error)
// Profile returns a profile of the deployment.
Profile(context.Context, *protos.RunProfiling) (*protos.Profile, error)
}
// RegisterServer registers a Server's methods with the provided mux under the
// /debug/serviceweaver/ prefix. You can use a Client to interact with a Status server.
func RegisterServer(mux *http.ServeMux, server Server, logger logtype.Logger) {
mux.Handle(statusEndpoint, protomsg.HandlerThunk(logger, server.Status))
mux.Handle(metricsEndpoint, protomsg.HandlerThunk(logger, server.Metrics))
mux.Handle(profileEndpoint, protomsg.HandlerFunc(logger, server.Profile))
mux.HandleFunc(prometheusEndpoint, func(w http.ResponseWriter, r *http.Request) {
ms, err := server.Metrics(r.Context())
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
snapshots := make([]*metrics.MetricSnapshot, len(ms.Metrics))
for i, m := range ms.Metrics {
snapshots[i] = metrics.UnProto(m)
}
var b bytes.Buffer
imetrics.TranslateMetricsToPrometheusTextFormat(&b, snapshots, r.Host, prometheusEndpoint)
w.Write(b.Bytes())
})
}