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service.go
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service.go
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// Copyright 2023 Dimitrij Drus <dadrus@gmx.de>
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package admissioncontroller
import (
"fmt"
"net/http"
"strings"
"time"
"github.com/inhies/go-bytesize"
"github.com/justinas/alice"
"github.com/rs/zerolog"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"github.com/dadrus/heimdall/internal/handler/middleware/http/accesslog"
"github.com/dadrus/heimdall/internal/handler/middleware/http/dump"
"github.com/dadrus/heimdall/internal/handler/middleware/http/logger"
"github.com/dadrus/heimdall/internal/handler/middleware/http/otelmetrics"
"github.com/dadrus/heimdall/internal/handler/middleware/http/recovery"
"github.com/dadrus/heimdall/internal/rules/provider/kubernetes/admissioncontroller/admission"
"github.com/dadrus/heimdall/internal/rules/rule"
"github.com/dadrus/heimdall/internal/x/httpx"
"github.com/dadrus/heimdall/internal/x/loggeradapter"
)
type errorHandlerFunc func(http.ResponseWriter, *http.Request, error)
func (f errorHandlerFunc) HandleError(rw http.ResponseWriter, req *http.Request, err error) {
f(rw, req, err)
}
func newService(
serviceName string,
ruleFactory rule.Factory,
authClass string,
log zerolog.Logger,
) *http.Server {
hc := alice.New(
accesslog.New(log),
logger.New(log),
dump.New(),
recovery.New(errorHandlerFunc(func(rw http.ResponseWriter, _ *http.Request, _ error) {
rw.WriteHeader(http.StatusInternalServerError)
})),
otelhttp.NewMiddleware("",
otelhttp.WithServerName(serviceName),
otelhttp.WithSpanNameFormatter(func(_ string, req *http.Request) string {
return fmt.Sprintf("EntryPoint %s %s%s",
strings.ToLower(req.URL.Scheme), httpx.LocalAddress(req), req.URL.Path)
}),
),
otelmetrics.New(
otelmetrics.WithSubsystem("validating admission webhook"),
otelmetrics.WithServerName(serviceName),
),
).Then(newHandler(ruleFactory, authClass))
return &http.Server{
Handler: hc,
ReadTimeout: 5 * time.Second, //nolint:gomnd
WriteTimeout: 10 * time.Second, //nolint:gomnd
IdleTimeout: 90 * time.Second, //nolint:gomnd
MaxHeaderBytes: int(4 * bytesize.KB), //nolint:gomnd
ErrorLog: loggeradapter.NewStdLogger(log),
}
}
func newHandler(ruleFactory rule.Factory, authClass string) http.Handler {
mux := http.NewServeMux()
mux.Handle("/validate-ruleset", admission.NewWebhook(&rulesetValidator{f: ruleFactory, ac: authClass}))
return mux
}