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ocagent.go
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ocagent.go
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package ocagent adds the ability to export all telemetry to an ocagent.
// This keeps the compile time dependencies to zero and allows the agent to
// have the exporters needed for telemetry aggregation and viewing systems.
package ocagent
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"os"
"path/filepath"
"sync"
"time"
"github.com/anz-bank/sysl/pkg/lspimpl/lspframework/telemetry"
"github.com/anz-bank/sysl/pkg/lspimpl/lspframework/telemetry/export"
"github.com/anz-bank/sysl/pkg/lspimpl/lspframework/telemetry/export/ocagent/wire"
"github.com/anz-bank/sysl/pkg/lspimpl/lspframework/telemetry/tag"
)
type Config struct {
Start time.Time
Host string
Process uint32
Client *http.Client
Service string
Address string
Rate time.Duration
}
// Discover finds the local agent to export to, it will return nil if there
// is not one running.
// TODO: Actually implement a discovery protocol rather than a hard coded address
func Discover() *Config {
return &Config{
Address: "http://localhost:55678",
}
}
type Exporter struct {
mu sync.Mutex
config Config
spans []*export.Span
metrics []telemetry.MetricData
}
// Connect creates a process specific exporter with the specified
// serviceName and the address of the ocagent to which it will upload
// its telemetry.
func Connect(config *Config) *Exporter {
if config == nil || config.Address == "off" {
return nil
}
exporter := &Exporter{config: *config}
if exporter.config.Start.IsZero() {
exporter.config.Start = time.Now()
}
if exporter.config.Host == "" {
hostname, _ := os.Hostname()
exporter.config.Host = hostname
}
if exporter.config.Process == 0 {
exporter.config.Process = uint32(os.Getpid())
}
if exporter.config.Client == nil {
exporter.config.Client = http.DefaultClient
}
if exporter.config.Service == "" {
exporter.config.Service = filepath.Base(os.Args[0])
}
if exporter.config.Rate == 0 {
exporter.config.Rate = 2 * time.Second
}
go func() {
for range time.Tick(exporter.config.Rate) {
exporter.Flush()
}
}()
return exporter
}
func (e *Exporter) ProcessEvent(ctx context.Context, event telemetry.Event) context.Context {
if event.Type != telemetry.EventEndSpan {
return ctx
}
e.mu.Lock()
defer e.mu.Unlock()
span := export.GetSpan(ctx)
if span != nil {
e.spans = append(e.spans, span)
}
return ctx
}
func (e *Exporter) Metric(ctx context.Context, data telemetry.MetricData) {
e.mu.Lock()
defer e.mu.Unlock()
e.metrics = append(e.metrics, data)
}
func (e *Exporter) Flush() {
e.mu.Lock()
defer e.mu.Unlock()
spans := make([]*wire.Span, len(e.spans))
for i, s := range e.spans {
spans[i] = convertSpan(s)
}
e.spans = nil
metrics := make([]*wire.Metric, len(e.metrics))
for i, m := range e.metrics {
metrics[i] = convertMetric(m, e.config.Start)
}
e.metrics = nil
if len(spans) > 0 {
e.send("/v1/trace", &wire.ExportTraceServiceRequest{
Node: e.config.buildNode(),
Spans: spans,
//TODO: Resource?
})
}
if len(metrics) > 0 {
e.send("/v1/metrics", &wire.ExportMetricsServiceRequest{
Node: e.config.buildNode(),
Metrics: metrics,
//TODO: Resource?
})
}
}
func (cfg *Config) buildNode() *wire.Node {
return &wire.Node{
Identifier: &wire.ProcessIdentifier{
HostName: cfg.Host,
Pid: cfg.Process,
StartTimestamp: convertTimestamp(cfg.Start),
},
LibraryInfo: &wire.LibraryInfo{
Language: wire.LanguageGo,
ExporterVersion: "0.0.1",
CoreLibraryVersion: "x/tools",
},
ServiceInfo: &wire.ServiceInfo{
Name: cfg.Service,
},
}
}
func (e *Exporter) send(endpoint string, message interface{}) {
blob, err := json.Marshal(message)
if err != nil {
errorInExport("ocagent failed to marshal message for %v: %v", endpoint, err)
return
}
uri := e.config.Address + endpoint
req, err := http.NewRequest("POST", uri, bytes.NewReader(blob))
if err != nil {
errorInExport("ocagent failed to build request for %v: %v", uri, err)
return
}
req.Header.Set("Content-Type", "application/json")
res, err := e.config.Client.Do(req)
if err != nil {
errorInExport("ocagent failed to send message: %v \n", err)
return
}
if res.Body != nil {
res.Body.Close()
}
}
func errorInExport(message string, args ...interface{}) {
// This function is useful when debugging the exporter, but in general we
// want to just drop any export
}
func convertTimestamp(t time.Time) wire.Timestamp {
return t.Format(time.RFC3339Nano)
}
func toTruncatableString(s string) *wire.TruncatableString {
if s == "" {
return nil
}
return &wire.TruncatableString{Value: s}
}
func convertSpan(span *export.Span) *wire.Span {
result := &wire.Span{
TraceID: span.ID.TraceID[:],
SpanID: span.ID.SpanID[:],
TraceState: nil, //TODO?
ParentSpanID: span.ParentID[:],
Name: toTruncatableString(span.Name),
Kind: wire.UnspecifiedSpanKind,
StartTime: convertTimestamp(span.Start),
EndTime: convertTimestamp(span.Finish),
Attributes: convertAttributes(span.Tags),
TimeEvents: convertEvents(span.Events),
SameProcessAsParentSpan: true,
//TODO: StackTrace?
//TODO: Links?
//TODO: Status?
//TODO: Resource?
}
return result
}
func convertMetric(data telemetry.MetricData, start time.Time) *wire.Metric {
descriptor := dataToMetricDescriptor(data)
timeseries := dataToTimeseries(data, start)
if descriptor == nil && timeseries == nil {
return nil
}
// TODO: handle Histogram metrics
return &wire.Metric{
MetricDescriptor: descriptor,
Timeseries: timeseries,
// TODO: attach Resource?
}
}
func convertAttributes(tags telemetry.TagList) *wire.Attributes {
if len(tags) == 0 {
return nil
}
attributes := make(map[string]wire.Attribute)
for _, tag := range tags {
attributes[fmt.Sprint(tag.Key)] = convertAttribute(tag.Value)
}
return &wire.Attributes{AttributeMap: attributes}
}
func convertAttribute(v interface{}) wire.Attribute {
switch v := v.(type) {
case int8:
return wire.IntAttribute{IntValue: int64(v)}
case int16:
return wire.IntAttribute{IntValue: int64(v)}
case int32:
return wire.IntAttribute{IntValue: int64(v)}
case int64:
return wire.IntAttribute{IntValue: v}
case int:
return wire.IntAttribute{IntValue: int64(v)}
case uint8:
return wire.IntAttribute{IntValue: int64(v)}
case uint16:
return wire.IntAttribute{IntValue: int64(v)}
case uint32:
return wire.IntAttribute{IntValue: int64(v)}
case uint64:
return wire.IntAttribute{IntValue: int64(v)}
case uint:
return wire.IntAttribute{IntValue: int64(v)}
case float32:
return wire.DoubleAttribute{DoubleValue: float64(v)}
case float64:
return wire.DoubleAttribute{DoubleValue: v}
case bool:
return wire.BoolAttribute{BoolValue: v}
case string:
return wire.StringAttribute{StringValue: toTruncatableString(v)}
default:
return wire.StringAttribute{StringValue: toTruncatableString(fmt.Sprint(v))}
}
}
func convertEvents(events []telemetry.Event) *wire.TimeEvents {
//TODO: MessageEvents?
result := make([]wire.TimeEvent, len(events))
for i, event := range events {
result[i] = convertEvent(event)
}
return &wire.TimeEvents{TimeEvent: result}
}
func convertEvent(event telemetry.Event) wire.TimeEvent {
return wire.TimeEvent{
Time: convertTimestamp(event.At),
Annotation: convertAnnotation(event),
}
}
func convertAnnotation(event telemetry.Event) *wire.Annotation {
description := event.Message
if description == "" && event.Error != nil {
description = event.Error.Error()
event.Error = nil
}
tags := event.Tags
if event.Error != nil {
tags = append(tags, tag.Of("error", event.Error))
}
if description == "" && len(tags) == 0 {
return nil
}
return &wire.Annotation{
Description: toTruncatableString(description),
Attributes: convertAttributes(tags),
}
}