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Add first set of tests + some helper functions cribbed from
mysqld_exporter Signed-off-by: Felix Yuan <felix.yuan@reddit.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package collector | ||
|
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| import ( | ||
| "strings" | ||
|
|
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| "github.com/prometheus/client_golang/prometheus" | ||
| dto "github.com/prometheus/client_model/go" | ||
| ) | ||
|
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| type labelMap map[string]string | ||
|
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| type MetricResult struct { | ||
| labels labelMap | ||
| value float64 | ||
| metricType dto.MetricType | ||
| } | ||
|
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| func readMetric(m prometheus.Metric) MetricResult { | ||
| pb := &dto.Metric{} | ||
| m.Write(pb) | ||
| labels := make(labelMap, len(pb.Label)) | ||
| for _, v := range pb.Label { | ||
| labels[v.GetName()] = v.GetValue() | ||
| } | ||
| if pb.Gauge != nil { | ||
| return MetricResult{labels: labels, value: pb.GetGauge().GetValue(), metricType: dto.MetricType_GAUGE} | ||
| } | ||
| if pb.Counter != nil { | ||
| return MetricResult{labels: labels, value: pb.GetCounter().GetValue(), metricType: dto.MetricType_COUNTER} | ||
| } | ||
| if pb.Untyped != nil { | ||
| return MetricResult{labels: labels, value: pb.GetUntyped().GetValue(), metricType: dto.MetricType_UNTYPED} | ||
| } | ||
| panic("Unsupported metric type") | ||
| } | ||
|
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| func sanitizeQuery(q string) string { | ||
| q = strings.Join(strings.Fields(q), " ") | ||
| q = strings.Replace(q, "(", "\\(", -1) | ||
| q = strings.Replace(q, ")", "\\)", -1) | ||
| q = strings.Replace(q, "*", "\\*", -1) | ||
| q = strings.Replace(q, "$", "\\$", -1) | ||
| return q | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package collector | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
|
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| "github.com/DATA-DOG/go-sqlmock" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| dto "github.com/prometheus/client_model/go" | ||
| "github.com/smartystreets/goconvey/convey" | ||
| ) | ||
|
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| func TestPGDatabaseCollector(t *testing.T) { | ||
| db, mock, err := sqlmock.New() | ||
| if err != nil { | ||
| t.Fatalf("Error opening a stub db connection: %s", err) | ||
| } | ||
| defer db.Close() | ||
|
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| mock.ExpectQuery(sanitizeQuery(pgDatabaseQuery)).WillReturnRows(sqlmock.NewRows([]string{"datname"}). | ||
| AddRow("postgres")) | ||
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| mock.ExpectQuery(sanitizeQuery(pgDatabaseSizeQuery)).WithArgs("postgres").WillReturnRows(sqlmock.NewRows([]string{"pg_database_size"}). | ||
| AddRow(1024)) | ||
|
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| ch := make(chan prometheus.Metric) | ||
| go func() { | ||
| defer close(ch) | ||
| c := PGDatabaseCollector{} | ||
| if err := c.Update(context.Background(), db, ch); err != nil { | ||
| t.Errorf("Error calling PGDatabaseCollector.Update: %s", err) | ||
| } | ||
| }() | ||
|
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| expected := []MetricResult{ | ||
| {labels: labelMap{"datname": "postgres"}, value: 1024, metricType: dto.MetricType_GAUGE}, | ||
| } | ||
| convey.Convey("Metrics comparison", t, func() { | ||
| for _, expect := range expected { | ||
| m := readMetric(<-ch) | ||
| convey.So(expect, convey.ShouldResemble, m) | ||
| } | ||
| }) | ||
| if err := mock.ExpectationsWereMet(); err != nil { | ||
| t.Errorf("there were unfulfilled exceptions: %s", err) | ||
| } | ||
| } |
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