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scraper_test.go
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scraper_test.go
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// Copyright 2020, OpenTelemetry Authors
//
// 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:https://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 nginxreceiver
import (
"context"
"errors"
"net/http"
"net/http/httptest"
"path/filepath"
"testing"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/component/componenttest"
"go.opentelemetry.io/collector/config/confighttp"
"go.opentelemetry.io/collector/config/configtls"
"go.opentelemetry.io/collector/receiver/receivertest"
"github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal/golden"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatatest/pmetrictest"
)
func TestScraper(t *testing.T) {
nginxMock := newMockServer(t)
cfg := createDefaultConfig().(*Config)
cfg.Endpoint = nginxMock.URL + "/status"
require.NoError(t, component.ValidateConfig(cfg))
scraper := newNginxScraper(receivertest.NewNopCreateSettings(), cfg)
err := scraper.start(context.Background(), componenttest.NewNopHost())
require.NoError(t, err)
actualMetrics, err := scraper.scrape(context.Background())
require.NoError(t, err)
expectedFile := filepath.Join("testdata", "scraper", "expected.json")
expectedMetrics, err := golden.ReadMetrics(expectedFile)
require.NoError(t, err)
require.NoError(t, pmetrictest.CompareMetrics(expectedMetrics, actualMetrics, pmetrictest.IgnoreStartTimestamp(),
pmetrictest.IgnoreTimestamp()))
}
func TestScraperError(t *testing.T) {
nginxMock := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if req.URL.Path == "/status" {
rw.WriteHeader(200)
_, _ = rw.Write([]byte(`Bad status page`))
return
}
rw.WriteHeader(404)
}))
t.Run("404", func(t *testing.T) {
sc := newNginxScraper(receivertest.NewNopCreateSettings(), &Config{
HTTPClientSettings: confighttp.HTTPClientSettings{
Endpoint: nginxMock.URL + "/badpath",
},
})
err := sc.start(context.Background(), componenttest.NewNopHost())
require.NoError(t, err)
_, err = sc.scrape(context.Background())
require.Equal(t, errors.New("expected 200 response, got 404"), err)
})
t.Run("parse error", func(t *testing.T) {
sc := newNginxScraper(receivertest.NewNopCreateSettings(), &Config{
HTTPClientSettings: confighttp.HTTPClientSettings{
Endpoint: nginxMock.URL + "/status",
},
})
err := sc.start(context.Background(), componenttest.NewNopHost())
require.NoError(t, err)
_, err = sc.scrape(context.Background())
require.Equal(t, errors.New("failed to parse response body \"Bad status page\": invalid input \"Bad status page\""), err)
})
}
func TestScraperFailedStart(t *testing.T) {
sc := newNginxScraper(receivertest.NewNopCreateSettings(), &Config{
HTTPClientSettings: confighttp.HTTPClientSettings{
Endpoint: "localhost:8080",
TLSSetting: configtls.TLSClientSetting{
TLSSetting: configtls.TLSSetting{
CAFile: "/non/existent",
},
},
},
})
err := sc.start(context.Background(), componenttest.NewNopHost())
require.Error(t, err)
}
func newMockServer(t *testing.T) *httptest.Server {
return httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if req.URL.Path == "/status" {
rw.WriteHeader(200)
_, err := rw.Write([]byte(`Active connections: 291
server accepts handled requests
16630948 16630946 31070465
Reading: 6 Writing: 179 Waiting: 106
`))
require.NoError(t, err)
return
}
rw.WriteHeader(404)
}))
}