Refactor collectors

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

pkg/collector/textfile/textfile_test_test.go

@@ -0,0 +1,99 @@
+package textfile_test
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/prometheus-community/windows_exporter/pkg/collector"
+	"github.com/prometheus-community/windows_exporter/pkg/collector/textfile"
+	"github.com/prometheus-community/windows_exporter/pkg/types"
+
+	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
+	dto "github.com/prometheus/client_model/go"
+)
+
+var baseDir = "../../../tools/textfile-test"
+
+func TestMultipleDirectories(t *testing.T) {
+	testDir := baseDir + "/multiple-dirs"
+	testDirs := fmt.Sprintf("%[1]s/dir1,%[1]s/dir2,%[1]s/dir3", testDir)
+
+	textfileCollector := textfile.New(log.NewLogfmtLogger(os.Stdout), &textfile.Config{
+		TextFileDirectories: testDirs,
+	})
+
+	collectors := collector.New(map[string]types.Collector{textfile.Name: textfileCollector})
+	require.NoError(t, collectors.Build())
+
+	scrapeContext, err := collectors.PrepareScrapeContext()
+	if err != nil {
+		t.Errorf("Unexpected error %s", err)
+	}
+	metrics := make(chan prometheus.Metric)
+	got := ""
+	go func() {
+		for {
+			var metric dto.Metric
+			val := <-metrics
+			err := val.Write(&metric)
+			if err != nil {
+				t.Errorf("Unexpected error %s", err)
+			}
+			got += metric.String()
+		}
+	}()
+
+	err = textfileCollector.Collect(scrapeContext, metrics)
+	if err != nil {
+		t.Errorf("Unexpected error %s", err)
+	}
+
+	for _, f := range []string{"dir1", "dir2", "dir3", "dir3sub"} {
+		if !strings.Contains(got, f) {
+			t.Errorf("Unexpected output %s: %q", f, got)
+		}
+	}
+}
+
+func TestDuplicateFileName(t *testing.T) {
+	testDir := baseDir + "/duplicate-filename"
+	textfileCollector := textfile.New(log.NewLogfmtLogger(os.Stdout), &textfile.Config{
+		TextFileDirectories: testDir,
+	})
+
+	collectors := collector.New(map[string]types.Collector{textfile.Name: textfileCollector})
+	require.NoError(t, collectors.Build())
+
+	scrapeContext, err := collectors.PrepareScrapeContext()
+	if err != nil {
+		t.Errorf("Unexpected error %s", err)
+	}
+	metrics := make(chan prometheus.Metric)
+	got := ""
+	go func() {
+		for {
+			var metric dto.Metric
+			val := <-metrics
+			err := val.Write(&metric)
+			if err != nil {
+				t.Errorf("Unexpected error %s", err)
+			}
+			got += metric.String()
+		}
+	}()
+	err = textfileCollector.Collect(scrapeContext, metrics)
+	if err != nil {
+		t.Errorf("Unexpected error %s", err)
+	}
+	if !strings.Contains(got, "file") {
+		t.Errorf("Unexpected output  %q", got)
+	}
+	if strings.Contains(got, "sub_file") {
+		t.Errorf("Unexpected output  %q", got)
+	}
+}