forked from mirror/client_golang
138 lines
4.0 KiB
Go
138 lines
4.0 KiB
Go
// Copyright 2016 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Copyright (c) 2013, The Prometheus Authors
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// All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found
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// in the LICENSE file.
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package promhttp
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import (
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"bytes"
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"errors"
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"log"
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"net/http"
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"net/http/httptest"
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"testing"
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"github.com/prometheus/client_golang/prometheus"
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)
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type errorCollector struct{}
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func (e errorCollector) Describe(ch chan<- *prometheus.Desc) {
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ch <- prometheus.NewDesc("invalid_metric", "not helpful", nil, nil)
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}
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func (e errorCollector) Collect(ch chan<- prometheus.Metric) {
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ch <- prometheus.NewInvalidMetric(
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prometheus.NewDesc("invalid_metric", "not helpful", nil, nil),
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errors.New("collect error"),
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)
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}
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func TestHandlerErrorHandling(t *testing.T) {
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// Create a registry that collects a MetricFamily with two elements,
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// another with one, and reports an error.
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reg := prometheus.NewRegistry()
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cnt := prometheus.NewCounter(prometheus.CounterOpts{
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Name: "the_count",
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Help: "Ah-ah-ah! Thunder and lightning!",
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})
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reg.MustRegister(cnt)
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cntVec := prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: "name",
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Help: "docstring",
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ConstLabels: prometheus.Labels{"constname": "constvalue"},
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},
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[]string{"labelname"},
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)
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cntVec.WithLabelValues("val1").Inc()
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cntVec.WithLabelValues("val2").Inc()
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reg.MustRegister(cntVec)
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reg.MustRegister(errorCollector{})
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logBuf := &bytes.Buffer{}
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logger := log.New(logBuf, "", 0)
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writer := httptest.NewRecorder()
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request, _ := http.NewRequest("GET", "/", nil)
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request.Header.Add("Accept", "test/plain")
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errorHandler := HandlerFor(reg, HandlerOpts{
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ErrorLog: logger,
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ErrorHandling: HTTPErrorOnError,
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})
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continueHandler := HandlerFor(reg, HandlerOpts{
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ErrorLog: logger,
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ErrorHandling: ContinueOnError,
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})
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panicHandler := HandlerFor(reg, HandlerOpts{
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ErrorLog: logger,
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ErrorHandling: PanicOnError,
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})
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wantMsg := `error gathering metrics: error collecting metric Desc{fqName: "invalid_metric", help: "not helpful", constLabels: {}, variableLabels: []}: collect error
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`
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wantErrorBody := `An error has occurred during metrics gathering:
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error collecting metric Desc{fqName: "invalid_metric", help: "not helpful", constLabels: {}, variableLabels: []}: collect error
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`
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wantOKBody := `# HELP name docstring
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# TYPE name counter
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name{constname="constvalue",labelname="val1"} 1
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name{constname="constvalue",labelname="val2"} 1
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# HELP the_count Ah-ah-ah! Thunder and lightning!
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# TYPE the_count counter
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the_count 0
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`
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errorHandler.ServeHTTP(writer, request)
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if got, want := writer.Code, http.StatusInternalServerError; got != want {
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t.Errorf("got HTTP status code %d, want %d", got, want)
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}
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if got := logBuf.String(); got != wantMsg {
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t.Errorf("got log message:\n%s\nwant log mesage:\n%s\n", got, wantMsg)
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}
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if got := writer.Body.String(); got != wantErrorBody {
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t.Errorf("got body:\n%s\nwant body:\n%s\n", got, wantErrorBody)
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}
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logBuf.Reset()
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writer.Body.Reset()
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writer.Code = http.StatusOK
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continueHandler.ServeHTTP(writer, request)
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if got, want := writer.Code, http.StatusOK; got != want {
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t.Errorf("got HTTP status code %d, want %d", got, want)
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}
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if got := logBuf.String(); got != wantMsg {
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t.Errorf("got log message %q, want %q", got, wantMsg)
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}
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if got := writer.Body.String(); got != wantOKBody {
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t.Errorf("got body %q, want %q", got, wantOKBody)
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}
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defer func() {
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if err := recover(); err == nil {
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t.Error("expected panic from panicHandler")
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}
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}()
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panicHandler.ServeHTTP(writer, request)
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}
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