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telemetry.go
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telemetry.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package fnapi
import (
"context"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/spf13/viper"
"go.uber.org/atomic"
spb "google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc/status"
"namespacelabs.dev/foundation/internal/cli/version"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/environment"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/fnerrors/format"
"namespacelabs.dev/foundation/internal/workspace/dirs"
"namespacelabs.dev/go-ids"
)
// TODO #93 compute this when we can move the service definition into the foundation repo.
const telemetryServiceName = "telemetry.TelemetryService"
const postTimeout = 1 * time.Second
type Telemetry struct {
useTelemetry bool
errorLogging bool // For testing and debugging.
backendAddress string
recID *atomic.String // Never nil, set after an invocation is recorded.
id ephemeralCliID
created bool // True if this the first invocation with a new ID.
}
func NewTelemetry(ctx context.Context) *Telemetry {
return InternalNewTelemetry(ctx, getOrGenerateEphemeralCliID)
}
func InternalNewTelemetry(ctx context.Context, makeID func(context.Context) (ephemeralCliID, bool)) *Telemetry {
id, created := makeID(ctx)
return &Telemetry{
errorLogging: false,
backendAddress: EndpointAddress,
recID: atomic.NewString(""),
id: id,
created: created,
}
}
type contextKey string
var (
_telemetryKey = contextKey("fn.telemetry")
)
func TelemetryOn(ctx context.Context) *Telemetry {
v := ctx.Value(_telemetryKey)
if v == nil {
return nil
}
return v.(*Telemetry)
}
func WithTelemetry(ctx context.Context) context.Context {
return context.WithValue(ctx, _telemetryKey, NewTelemetry(ctx))
}
// Telemetry needs to be excplicitly enabled by calling this function.
// IsTelemetryEnabled() may still be false if telemetry is disabled through DO_NOT_TRACK, etc.
func (tel *Telemetry) Enable() {
tel.useTelemetry = true
}
func (tel *Telemetry) IsTelemetryEnabled() bool {
doNotTrack := os.Getenv("DO_NOT_TRACK")
enableTelemetry := viper.GetBool("enable_telemetry")
return !environment.IsRunningInCI() && tel.useTelemetry && doNotTrack == "" && enableTelemetry
}
func (tel *Telemetry) logError(ctx context.Context, err error) {
if tel.errorLogging {
format.Format(console.Stderr(ctx), err)
}
}
func combinedHash(ins ...string) string {
h := sha256.New()
for _, in := range ins {
h.Write([]byte(in))
}
return hex.EncodeToString(h.Sum(nil))
}
// TODO #93 remove structs when we can move the service definition into the foundation repo.
type flag struct {
Name string `json:"name,omitempty"`
Hash string `json:"hash,omitempty"`
Plaintext string `json:"plaintext,omitempty"`
}
type arg struct {
Hash string `json:"hash,omitempty"`
Plaintext string `json:"plaintext,omitempty"`
}
type binaryVersion struct {
Version string `json:"version,omitempty"`
BuildTime string `json:"build_time,omitempty"`
Modified bool `json:"modified,omitempty"`
}
type recordInvocationRequest struct {
ID string `json:"id,omitempty"`
Command string `json:"command,omitempty"`
Arg []arg `json:"arg"`
Flag []flag `json:"flag"`
UserId string `json:"user_id,omitempty"`
Os string `json:"os,omitempty"`
Arch string `json:"arch,omitempty"`
NumCpu int `json:"num_cpu"`
Version *binaryVersion `json:"version"`
}
type recordErrorRequest struct {
ID string `json:"id,omitempty"`
Message string `json:"message,omitempty"`
Status *spb.Status `json:"status,omitempty"`
}
type ephemeralCliID struct {
ID string `json:"id"`
Salt string `json:"salt"`
}
func newRandID() string {
return ids.NewRandomBase62ID(16)
}
func getOrGenerateEphemeralCliID(ctx context.Context) (ephemeralCliID, bool) {
configDir, err := dirs.Config()
if err != nil {
panic(err) // XXX Config() should not return an error.
}
idfile := filepath.Join(configDir, "clientid.json")
idcontents, err := os.ReadFile(idfile)
if err == nil {
var clientID ephemeralCliID
if err := json.Unmarshal(idcontents, &clientID); err == nil {
if clientID.ID != "" && clientID.Salt != "" {
return clientID, false
}
}
}
newClientID := ephemeralCliID{newRandID(), newRandID()}
if err := writeJSON(idfile, newClientID); err != nil {
fmt.Fprintln(console.Warnings(ctx), "failed to persist user-id", err)
}
return newClientID, os.IsNotExist(err)
}
func writeJSON(path string, msg interface{}) error {
data, err := json.Marshal(msg)
if err != nil {
return err
}
return os.WriteFile(path, data, 0644)
}
func fullCommand(cmd *cobra.Command) string {
commands := []string{cmd.Use}
for cmd.HasParent() {
cmd = cmd.Parent()
commands = append([]string{cmd.Use}, commands...)
}
return strings.Join(commands, " ")
}
// Extracts command name and set flags from cmd. Reports args and flag values in hashed form.
func buildRecordInvocationRequest(ctx context.Context, cmd *cobra.Command, c ephemeralCliID, reqID string, args []string) *recordInvocationRequest {
req := recordInvocationRequest{
ID: reqID,
Command: fullCommand(cmd),
UserId: c.ID,
Os: runtime.GOOS,
Arch: runtime.GOARCH,
NumCpu: runtime.NumCPU(),
}
if v, err := version.Current(); err == nil {
if v.Modified {
// don't upload version information on modified binaries
req.Version = &binaryVersion{
Modified: true,
}
} else {
req.Version = &binaryVersion{
Version: v.GitCommit,
BuildTime: v.BuildTimeStr,
Modified: false,
}
}
}
cmd.Flags().Visit(func(pflag *pflag.Flag) {
req.Flag = append(req.Flag, flag{
Name: pflag.Name,
Hash: combinedHash(pflag.Value.String(), pflag.Name, c.Salt),
})
})
for _, a := range args {
req.Arg = append(req.Arg, arg{Hash: combinedHash(a, c.Salt)})
}
return &req
}
func (tel *Telemetry) postRecordInvocationRequest(ctx context.Context, req *recordInvocationRequest) error {
ctx, cancel := context.WithTimeout(ctx, postTimeout)
defer cancel()
record := Call[recordInvocationRequest]{
Endpoint: tel.backendAddress,
Method: fmt.Sprintf("%s/RecordInvocation", telemetryServiceName),
OptionalAuth: true,
}
return record.Do(ctx, *req, nil)
}
func (tel *Telemetry) recordInvocation(ctx context.Context, cmd *cobra.Command, reqID string, args []string) {
if !tel.IsTelemetryEnabled() {
return
}
req := buildRecordInvocationRequest(ctx, cmd, tel.id, reqID, args)
if err := tel.postRecordInvocationRequest(ctx, req); err != nil {
tel.logError(ctx, err)
return
}
// Only store request id if recoding the invocation succeeded.
tel.recID.Store(req.ID)
}
func (tel *Telemetry) RecordInvocation(ctx context.Context, cmd *cobra.Command, args []string) string {
reqID := ids.NewRandomBase62ID(16)
// Telemetry should be best effort and not block the user.
go tel.recordInvocation(ctx, cmd, reqID, args)
return reqID
}
func (tel *Telemetry) postRecordErrorRequest(ctx context.Context, req recordErrorRequest) error {
ctx, cancel := context.WithTimeout(ctx, postTimeout)
defer cancel()
return AnonymousCall(ctx, tel.backendAddress, fmt.Sprintf("%s/RecordError", telemetryServiceName), req, nil)
}
func (tel *Telemetry) RecordError(ctx context.Context, err error) {
if !tel.IsTelemetryEnabled() || err == nil {
return
}
tel.recordError(ctx, tel.recID.Load(), err)
}
func (tel *Telemetry) recordError(ctx context.Context, recID string, err error) {
if err == nil {
return
}
if _, isExpected := fnerrors.IsExpected(err); isExpected {
// We are only interested in unexpected errors.
return
}
// If we never saw a recorded ID, bail out.
if recID == "" {
tel.logError(ctx, fmt.Errorf("didn't receive telemetry record id"))
return
}
req := recordErrorRequest{ID: recID}
st, _ := status.FromError(err)
req.Message = err.Error()
req.Status = st.Proto()
if err := tel.postRecordErrorRequest(ctx, req); err != nil {
tel.logError(ctx, err)
}
}
func (tel *Telemetry) IsFirstRun() bool { return tel.created }
func (tel *Telemetry) GetClientID() string {
if tel == nil {
return ""
}
if !tel.IsTelemetryEnabled() {
return ""
}
return tel.id.ID
}