otel: capture whether process was invoked from a terminal

This commit adds a "terminal" attribute to `BaseMetricAttributes`
that allows us to discern whether an invocation was from an interactive
terminal or not.

Signed-off-by: Laura Brehm <laurabrehm@hey.com>

cli/command/telemetry.go

@@ -110,7 +110,7 @@ func (r *telemetryResource) init() {
 		return
 	}
 
-	opts := append(r.defaultOptions(), r.opts...)
+	opts := append(defaultResourceOptions(), r.opts...)
 	res, err := resource.New(context.Background(), opts...)
 	if err != nil {
 		otel.Handle(err)
@@ -122,7 +122,7 @@ func (r *telemetryResource) init() {
 	r.opts = nil
 }
 
-func (r *telemetryResource) defaultOptions() []resource.Option {
+func defaultResourceOptions() []resource.Option {
 	return []resource.Option{
 		resource.WithDetectors(serviceNameDetector{}),
 		resource.WithAttributes(

cli/command/telemetry_utils.go

@@ -8,18 +8,18 @@ import (
 	"time"
 
 	"github.com/docker/cli/cli/version"
+	"github.com/moby/term"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
 )
 
-// BaseMetricAttributes returns an attribute.Set containing attributes to attach to metrics/traces
+// BaseCommandAttributes returns an attribute.Set containing attributes to attach to metrics/traces
-func BaseMetricAttributes(cmd *cobra.Command) attribute.Set {
+func BaseCommandAttributes(cmd *cobra.Command, streams Streams) []attribute.KeyValue {
-	attrList := []attribute.KeyValue{
+	return append([]attribute.KeyValue{
 		attribute.String("command.name", getCommandName(cmd)),
-	}
+	}, stdioAttributes(streams)...)
-	return attribute.NewSet(attrList...)
 }
 
 // InstrumentCobraCommands wraps all cobra commands' RunE funcs to set a command duration metric using otel.
@@ -27,7 +27,7 @@ func BaseMetricAttributes(cmd *cobra.Command) attribute.Set {
 // Note: this should be the last func to wrap/modify the PersistentRunE/RunE funcs before command execution.
 //
 // can also be used for spans!
-func InstrumentCobraCommands(cmd *cobra.Command, mp metric.MeterProvider) {
+func (cli *DockerCli) InstrumentCobraCommands(cmd *cobra.Command, mp metric.MeterProvider) {
 	meter := getDefaultMeter(mp)
 	// If PersistentPreRunE is nil, make it execute PersistentPreRun and return nil by default
 	ogPersistentPreRunE := cmd.PersistentPreRunE
@@ -56,7 +56,8 @@ func InstrumentCobraCommands(cmd *cobra.Command, mp metric.MeterProvider) {
 		}
 		cmd.RunE = func(cmd *cobra.Command, args []string) error {
 			// start the timer as the first step of every cobra command
-			stopCobraCmdTimer := startCobraCommandTimer(cmd, meter)
+			baseAttrs := BaseCommandAttributes(cmd, cli)
+			stopCobraCmdTimer := startCobraCommandTimer(cmd, meter, baseAttrs)
 			cmdErr := ogRunE(cmd, args)
 			stopCobraCmdTimer(cmdErr)
 			return cmdErr
@@ -66,9 +67,8 @@ func InstrumentCobraCommands(cmd *cobra.Command, mp metric.MeterProvider) {
 	}
 }
 
-func startCobraCommandTimer(cmd *cobra.Command, meter metric.Meter) func(err error) {
+func startCobraCommandTimer(cmd *cobra.Command, meter metric.Meter, attrs []attribute.KeyValue) func(err error) {
 	ctx := cmd.Context()
-	baseAttrs := BaseMetricAttributes(cmd)
 	durationCounter, _ := meter.Float64Counter(
 		"command.time",
 		metric.WithDescription("Measures the duration of the cobra command"),
@@ -80,12 +80,22 @@ func startCobraCommandTimer(cmd *cobra.Command, meter metric.Meter) func(err err
 		duration := float64(time.Since(start)) / float64(time.Millisecond)
 		cmdStatusAttrs := attributesFromError(err)
 		durationCounter.Add(ctx, duration,
-			metric.WithAttributeSet(baseAttrs),
+			metric.WithAttributes(attrs...),
-			metric.WithAttributeSet(attribute.NewSet(cmdStatusAttrs...)),
+			metric.WithAttributes(cmdStatusAttrs...),
 		)
 	}
 }
 
+func stdioAttributes(streams Streams) []attribute.KeyValue {
+	// we don't wrap stderr, but we do wrap in/out
+	_, stderrTty := term.GetFdInfo(streams.Err())
+	return []attribute.KeyValue{
+		attribute.Bool("command.stdin.isatty", streams.In().IsTerminal()),
+		attribute.Bool("command.stdout.isatty", streams.Out().IsTerminal()),
+		attribute.Bool("command.stderr.isatty", stderrTty),
+	}
+}
+
 func attributesFromError(err error) []attribute.KeyValue {
 	attrs := []attribute.KeyValue{}
 	exitCode := 0

cli/command/telemetry_utils_test.go

@@ -1,9 +1,16 @@
 package command
 
 import (
+	"bytes"
+	"context"
+	"io"
+	"reflect"
+	"strings"
 	"testing"
 
+	"github.com/docker/cli/cli/streams"
 	"github.com/spf13/cobra"
+	"go.opentelemetry.io/otel/attribute"
 	"gotest.tools/v3/assert"
 )
 
@@ -92,3 +99,91 @@ func TestGetCommandName(t *testing.T) {
 		})
 	}
 }
+
+func TestStdioAttributes(t *testing.T) {
+	outBuffer := new(bytes.Buffer)
+	errBuffer := new(bytes.Buffer)
+	t.Parallel()
+	for _, tc := range []struct {
+		test      string
+		stdinTty  bool
+		stdoutTty bool
+		// TODO(laurazard): test stderr
+		expected []attribute.KeyValue
+	}{
+		{
+			test: "",
+			expected: []attribute.KeyValue{
+				attribute.Bool("command.stdin.isatty", false),
+				attribute.Bool("command.stdout.isatty", false),
+				attribute.Bool("command.stderr.isatty", false),
+			},
+		},
+		{
+			test:      "",
+			stdinTty:  true,
+			stdoutTty: true,
+			expected: []attribute.KeyValue{
+				attribute.Bool("command.stdin.isatty", true),
+				attribute.Bool("command.stdout.isatty", true),
+				attribute.Bool("command.stderr.isatty", false),
+			},
+		},
+	} {
+		tc := tc
+		t.Run(tc.test, func(t *testing.T) {
+			t.Parallel()
+			cli := &DockerCli{
+				in:  streams.NewIn(io.NopCloser(strings.NewReader(""))),
+				out: streams.NewOut(outBuffer),
+				err: errBuffer,
+			}
+			cli.In().SetIsTerminal(tc.stdinTty)
+			cli.Out().SetIsTerminal(tc.stdoutTty)
+			actual := stdioAttributes(cli)
+
+			assert.Check(t, reflect.DeepEqual(actual, tc.expected))
+		})
+	}
+}
+
+func TestAttributesFromError(t *testing.T) {
+	t.Parallel()
+
+	for _, tc := range []struct {
+		testName string
+		err      error
+		expected []attribute.KeyValue
+	}{
+		{
+			testName: "no error",
+			err:      nil,
+			expected: []attribute.KeyValue{
+				attribute.String("command.status.code", "0"),
+			},
+		},
+		{
+			testName: "non-0 exit code",
+			err:      statusError{StatusCode: 127},
+			expected: []attribute.KeyValue{
+				attribute.String("command.error.type", "generic"),
+				attribute.String("command.status.code", "127"),
+			},
+		},
+		{
+			testName: "canceled",
+			err:      context.Canceled,
+			expected: []attribute.KeyValue{
+				attribute.String("command.error.type", "canceled"),
+				attribute.String("command.status.code", "1"),
+			},
+		},
+	} {
+		tc := tc
+		t.Run(tc.testName, func(t *testing.T) {
+			t.Parallel()
+			actual := attributesFromError(tc.err)
+			assert.Check(t, reflect.DeepEqual(actual, tc.expected))
+		})
+	}
+}

cmd/docker/docker.go

@@ -304,7 +304,7 @@ func runDocker(ctx context.Context, dockerCli *command.DockerCli) error {
 	mp := dockerCli.MeterProvider(ctx)
 	defer mp.Shutdown(ctx)
 	otel.SetMeterProvider(mp)
-	command.InstrumentCobraCommands(cmd, mp)
+	dockerCli.InstrumentCobraCommands(cmd, mp)
 
 	var envs []string
 	args, os.Args, envs, err = processAliases(dockerCli, cmd, args, os.Args)