telemetry: add tracing

- telemetry/tace: add traces throughout code
- telemetry/metrics: nest metrics and trace under telemetry
- telemetry/tace: add service name span to HTTPMetricsHandler.
- telemetry/metrics: removed chain dependency middleware_tests.
- telemetry/metrics: wrap and encapsulate variatic view registration.
- telemetry/tace: add jaeger support for tracing.
- cmd/pomerium: move `parseOptions` to internal/config.
- cmd/pomerium: offload server handling to httputil and sub pkgs.
- httputil: standardize creation/shutdown of http listeners.
- httputil: prefer curve X25519 to P256 when negotiating TLS.
- fileutil: use standardized Getw

Signed-off-by: Bobby DeSimone <bobbydesimone@gmail.com>

internal/telemetry/metrics/info_test.go

@@ -0,0 +1,85 @@
+package metrics // import "github.com/pomerium/pomerium/internal/telemetry/metrics"
+
+import (
+	"runtime"
+	"testing"
+
+	"github.com/pomerium/pomerium/internal/version"
+
+	"go.opencensus.io/metric/metricdata"
+	"go.opencensus.io/metric/metricproducer"
+	"go.opencensus.io/stats/view"
+)
+
+func Test_SetConfigInfo(t *testing.T) {
+	tests := []struct {
+		name                  string
+		success               bool
+		checksum              string
+		wantLastReload        string
+		wantLastReloadSuccess string
+	}{
+		{"success", true, "abcde", "{ { {service test_service} }&{1.", "{ { {service test_service} }&{1} }"},
+		{"failed", false, "abcde", "", "{ {  }&{0} }"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			view.Unregister(InfoViews...)
+			view.Register(InfoViews...)
+			SetConfigInfo("test_service", tt.success, tt.checksum)
+
+			testDataRetrieval(ConfigLastReloadView, t, tt.wantLastReload)
+			testDataRetrieval(ConfigLastReloadSuccessView, t, tt.wantLastReloadSuccess)
+		})
+	}
+}
+
+func Test_SetBuildInfo(t *testing.T) {
+	registry = newMetricRegistry()
+
+	version.Version = "v0.0.1"
+	version.GitCommit = "deadbeef"
+
+	wantLabels := []metricdata.LabelValue{
+		{Value: "test_service", Present: true},
+		{Value: version.FullVersion(), Present: true},
+		{Value: version.GitCommit, Present: true},
+		{Value: runtime.Version(), Present: true},
+	}
+
+	SetBuildInfo("test_service")
+	testMetricRetrieval(registry.registry.Read(), t, wantLabels, int64(1), "build_info")
+}
+
+func Test_AddPolicyCountCallback(t *testing.T) {
+	registry = newMetricRegistry()
+
+	wantValue := int64(42)
+	wantLabels := []metricdata.LabelValue{{Value: "test_service", Present: true}}
+	AddPolicyCountCallback("test_service", func() int64 { return wantValue })
+
+	testMetricRetrieval(registry.registry.Read(), t, wantLabels, wantValue, "policy_count_total")
+}
+
+func Test_SetConfigChecksum(t *testing.T) {
+	registry = newMetricRegistry()
+
+	wantValue := uint64(42)
+	wantLabels := []metricdata.LabelValue{{Value: "test_service", Present: true}}
+	SetConfigChecksum("test_service", wantValue)
+
+	testMetricRetrieval(registry.registry.Read(), t, wantLabels, float64(wantValue), "config_checksum_decimal")
+}
+
+func Test_RegisterInfoMetrics(t *testing.T) {
+	metricproducer.GlobalManager().DeleteProducer(registry.registry)
+	RegisterInfoMetrics()
+	// Make sure registration de-dupes on multiple calls
+	RegisterInfoMetrics()
+
+	r := metricproducer.GlobalManager().GetAll()
+	if len(r) != 2 {
+		t.Error("Did not find enough registries")
+	}
+}