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test(outputs.prometheus_client): Add tests for content-type header (i…
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123 changes: 123 additions & 0 deletions
123
plugins/outputs/prometheus_client/prometheus_client_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package prometheus_client | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "net/url" | ||
| "strings" | ||
| "testing" | ||
|
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| "github.com/stretchr/testify/require" | ||
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| "github.com/influxdata/telegraf/testutil" | ||
| ) | ||
|
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| func TestLandingPage(t *testing.T) { | ||
| output := PrometheusClient{ | ||
| Listen: ":0", | ||
| CollectorsExclude: []string{"process"}, | ||
| MetricVersion: 1, | ||
| Log: &testutil.Logger{Name: "outputs.prometheus_client"}, | ||
| } | ||
| expected := "Telegraf Output Plugin: Prometheus Client" | ||
|
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| require.NoError(t, output.Init()) | ||
| require.NoError(t, output.Connect()) | ||
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| u, err := url.Parse(fmt.Sprintf("http://%s/", output.url.Host)) | ||
| require.NoError(t, err) | ||
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| resp, err := http.Get(u.String()) | ||
| require.NoError(t, err) | ||
| defer resp.Body.Close() | ||
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| actual, err := io.ReadAll(resp.Body) | ||
| require.NoError(t, err) | ||
| require.Equal(t, expected, strings.TrimSpace(string(actual))) | ||
| } | ||
|
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| func TestFormatHeader(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| accept string | ||
| expected string | ||
| }{ | ||
| { | ||
| name: "invalid accept ", | ||
| accept: "applications/json", | ||
| expected: "text/plain; version=0.0.4; charset=utf-8; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "no accept header", | ||
| expected: "text/plain; version=0.0.4; charset=utf-8; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "text no version", | ||
| accept: "text/plain", | ||
| expected: "text/plain; version=0.0.4; charset=utf-8; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "text with version 0.0.4", | ||
| accept: "text/plain; version=0.0.4", | ||
| expected: "text/plain; version=0.0.4; charset=utf-8; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "protobuf text format", | ||
| accept: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=text", | ||
| expected: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=text; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "protobuf compact text format", | ||
| accept: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=compact-text", | ||
| expected: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=compact-text; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "protobuf delimited format", | ||
| accept: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited", | ||
| expected: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "multiple accept preferring protobuf", | ||
| accept: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited, text/plain", | ||
| expected: "application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited; escaping=underscores", | ||
| }, | ||
| { | ||
| name: "multiple accept preferring text", | ||
| accept: "text/plain, application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited", | ||
| expected: "text/plain; version=0.0.4; charset=utf-8; escaping=underscores", | ||
| }, | ||
| } | ||
|
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| // Setup the plugin | ||
| plugin := PrometheusClient{ | ||
| Listen: ":0", | ||
| Log: testutil.Logger{Name: "outputs.prometheus_client"}, | ||
| } | ||
| require.NoError(t, plugin.Init()) | ||
| require.NoError(t, plugin.Connect()) | ||
|
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| // Get the plugin's address so we can send data to it | ||
| addr := fmt.Sprintf("http://%s/metrics", plugin.url.Host) | ||
|
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| // Run the actual tests | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| // Construct a request with the given "Accept" header | ||
| req, err := http.NewRequest("GET", addr, nil) | ||
| require.NoError(t, err) | ||
| if tt.accept != "" { | ||
| req.Header.Add("Accept", tt.accept) | ||
| } | ||
|
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| // Get the metrics | ||
| resp, err := http.DefaultClient.Do(req) | ||
| require.NoError(t, err) | ||
| defer resp.Body.Close() | ||
|
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| // Test the result | ||
| require.NotEmpty(t, resp.Body) | ||
| require.Equal(t, tt.expected, resp.Header.Get("Content-Type")) | ||
| }) | ||
| } | ||
| } |
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