forked from newrelic/go-agent
/
internal_app.go
704 lines (602 loc) · 17.4 KB
/
internal_app.go
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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package newrelic
import (
"errors"
"fmt"
"io"
"math"
"net/http"
"os"
"strings"
"sync"
"time"
"github.com/newrelic/go-agent/v3/internal"
)
type appData struct {
id internal.AgentRunID
data harvestable
}
type app struct {
Logger
config config
rpmControls rpmControls
testHarvest *harvest
trObserver traceObserver
// placeholderRun is used when the application is not connected.
placeholderRun *appRun
// initiateShutdown is used to tell the processor to shutdown.
initiateShutdown chan time.Duration
// shutdownStarted and shutdownComplete are closed by the processor
// goroutine to indicate the shutdown status. Two channels are used so
// that the call of app.Shutdown() can block until shutdown has
// completed but other goroutines can exit when shutdown has started.
// This is not just an optimization: This prevents a deadlock if
// harvesting data during the shutdown fails and an attempt is made to
// merge the data into the next harvest.
shutdownStarted chan struct{}
shutdownComplete chan struct{}
// Sends to these channels should not occur without a <-shutdownStarted
// select option to prevent deadlock.
dataChan chan appData
collectorErrorChan chan rpmResponse
connectChan chan *appRun
// This mutex protects both `run` and `err`, both of which should only
// be accessed using getState and setState.
sync.RWMutex
// run is non-nil when the app is successfully connected. It is
// immutable.
run *appRun
// err is non-nil if the application will never be connected again
// (disconnect, license exception, shutdown).
err error
serverless *serverlessHarvest
}
func (app *app) doHarvest(h *harvest, harvestStart time.Time, run *appRun) {
h.CreateFinalMetrics(run, app.getObserver())
payloads := h.Payloads(app.config.DistributedTracer.Enabled)
for _, p := range payloads {
cmd := p.EndpointMethod()
var data []byte
defer func() {
if r := recover(); r != nil {
app.Warn("panic occured when creating harvest data", map[string]interface{}{
"cmd": cmd,
"panic": r,
})
// make sure the loop continues
data = nil
}
}()
data, err := p.Data(run.Reply.RunID.String(), harvestStart)
if err != nil {
app.Warn("unable to create harvest data", map[string]interface{}{
"cmd": cmd,
"error": err.Error(),
})
continue
}
if data == nil {
continue
}
call := rpmCmd{
Collector: run.Reply.Collector,
RunID: run.Reply.RunID.String(),
Name: cmd,
Data: data,
RequestHeadersMap: run.Reply.RequestHeadersMap,
MaxPayloadSize: run.Reply.MaxPayloadSizeInBytes,
}
resp := collectorRequest(call, app.rpmControls)
if resp.IsDisconnect() || resp.IsRestartException() {
select {
case app.collectorErrorChan <- resp:
case <-app.shutdownStarted:
}
return
}
if resp.Err != nil {
app.Warn("harvest failure", map[string]interface{}{
"cmd": cmd,
"error": resp.Err.Error(),
"retain_data": resp.ShouldSaveHarvestData(),
})
}
if resp.ShouldSaveHarvestData() {
app.Consume(run.Reply.RunID, p)
}
}
}
func (app *app) connectRoutine() {
attempts := 0
for {
reply, resp := connectAttempt(app.config, app.rpmControls)
if reply != nil {
select {
case app.connectChan <- newAppRun(app.config, reply):
case <-app.shutdownStarted:
}
return
}
if resp.IsDisconnect() {
select {
case app.collectorErrorChan <- resp:
case <-app.shutdownStarted:
}
return
}
if nil != resp.Err {
app.Warn("application connect failure", map[string]interface{}{
"error": resp.Err.Error(),
})
}
backoff := getConnectBackoffTime(attempts)
time.Sleep(time.Duration(backoff) * time.Second)
attempts++
}
}
func (app *app) connectTraceObserver(reply *internal.ConnectReply) {
if obs := app.getObserver(); obs != nil {
obs.restart(reply.RunID, reply.RequestHeadersMap)
return
}
var endpoint observerURL
if nil != app.config.traceObserverURL {
endpoint = *app.config.traceObserverURL
}
observer, err := newTraceObserver(reply.RunID, reply.RequestHeadersMap, observerConfig{
endpoint: endpoint,
license: app.config.License,
log: app.config.Logger,
queueSize: app.config.InfiniteTracing.SpanEvents.QueueSize,
appShutdown: app.shutdownComplete,
dialer: reply.TraceObsDialer,
})
if nil != err {
app.Error("unable to create trace observer", map[string]interface{}{
"err": err.Error(),
})
return
}
app.Debug("trace observer connected", map[string]interface{}{
"url": app.config.traceObserverURL.host,
})
app.setObserver(observer)
}
// Connect backoff time follows the sequence defined at
// https://source.datanerd.us/agents/agent-specs/blob/master/Collector-Response-Handling.md#retries-and-backoffs
func getConnectBackoffTime(attempt int) int {
connectBackoffTimes := [...]int{15, 15, 30, 60, 120, 300}
l := len(connectBackoffTimes)
if (attempt < 0) || (attempt >= l) {
return connectBackoffTimes[l-1]
}
return connectBackoffTimes[attempt]
}
func processConnectMessages(run *appRun, lg Logger) {
for _, msg := range run.Reply.Messages {
event := "collector message"
cn := map[string]interface{}{"msg": msg.Message}
switch strings.ToLower(msg.Level) {
case "error":
lg.Error(event, cn)
case "warn":
lg.Warn(event, cn)
case "info":
lg.Info(event, cn)
case "debug", "verbose":
lg.Debug(event, cn)
}
}
}
func (app *app) process() {
// Both the harvest and the run are non-nil when the app is connected,
// and nil otherwise.
var h *harvest
var run *appRun
harvestTicker := time.NewTicker(time.Second)
defer harvestTicker.Stop()
for {
select {
case <-harvestTicker.C:
if nil != run {
now := time.Now()
if ready := h.Ready(now); nil != ready {
go app.doHarvest(ready, now, run)
}
}
case d := <-app.dataChan:
if nil != run && run.Reply.RunID == d.id {
d.data.MergeIntoHarvest(h)
}
case timeout := <-app.initiateShutdown:
close(app.shutdownStarted)
// Remove the run before merging any final data to
// ensure a bounded number of receives from dataChan.
app.setState(nil, errors.New("application shut down"))
if obs := app.getObserver(); obs != nil {
if err := obs.shutdown(timeout); err != nil {
app.Error("trace observer shutdown timeout exceeded", map[string]interface{}{
"err": err.Error(),
})
}
}
if nil != run {
for done := false; !done; {
select {
case d := <-app.dataChan:
if run.Reply.RunID == d.id {
d.data.MergeIntoHarvest(h)
}
default:
done = true
}
}
app.doHarvest(h, time.Now(), run)
}
close(app.shutdownComplete)
app.setObserver(nil)
return
case resp := <-app.collectorErrorChan:
run = nil
h = nil
app.setState(nil, nil)
if resp.IsDisconnect() {
app.setState(nil, resp.Err)
app.Error("application disconnected", map[string]interface{}{
"app": app.config.AppName,
})
} else if resp.IsRestartException() {
app.Info("application restarted", map[string]interface{}{
"app": app.config.AppName,
})
go app.connectRoutine()
}
case run = <-app.connectChan:
if shouldUseTraceObserver(run.Config) {
app.connectTraceObserver(run.Reply)
} else if shouldUseTraceObserver(app.config) {
app.Debug("trace observer disabled via backend", map[string]interface{}{
"local-DistributedTracer.Enabled": app.config.DistributedTracer.Enabled,
"server-DistributedTracer.Enabled": run.Config.DistributedTracer.Enabled,
"local-SpanEvents.Enabled": app.config.SpanEvents.Enabled,
"server-SpanEvents.Enabled": run.Config.SpanEvents.Enabled,
})
}
run.harvestConfig.CommonAttributes = commonAttributes{
hostname: app.config.hostname,
entityName: app.config.AppName,
entityGUID: run.Reply.EntityGUID,
}
h = newHarvest(time.Now(), run.harvestConfig)
app.setState(run, nil)
app.Info("application connected", map[string]interface{}{
"app": app.config.AppName,
"run": run.Reply.RunID.String(),
})
processConnectMessages(run, app)
}
}
}
func (app *app) Shutdown(timeout time.Duration) {
if nil == app {
return
}
if !app.config.Enabled {
return
}
if app.config.ServerlessMode.Enabled {
return
}
select {
case app.initiateShutdown <- timeout:
default:
}
// Block until shutdown is done or timeout occurs.
t := time.NewTimer(timeout)
select {
case <-app.shutdownComplete:
case <-t.C:
}
t.Stop()
app.Info("application shutdown", map[string]interface{}{
"app": app.config.AppName,
})
}
func runSampler(app *app, period time.Duration) {
previous := getSystemSample(time.Now(), app)
t := time.NewTicker(period)
for {
select {
case now := <-t.C:
current := getSystemSample(now, app)
run, _ := app.getState()
app.Consume(run.Reply.RunID, getSystemStats(systemSamples{
Previous: previous,
Current: current,
}))
previous = current
case <-app.shutdownStarted:
t.Stop()
return
}
}
}
func (app *app) WaitForConnection(timeout time.Duration) error {
if nil == app {
return nil
}
if !app.config.Enabled {
return nil
}
if app.config.ServerlessMode.Enabled {
return nil
}
deadline := time.Now().Add(timeout)
pollPeriod := 50 * time.Millisecond
for {
run, err := app.getState()
if nil != err {
return err
}
if run.Reply.RunID != "" {
if shouldUseTraceObserver(run.Config) {
if obs := app.getObserver(); obs != nil && obs.initialConnCompleted() {
return nil
}
} else {
return nil
}
}
if time.Now().After(deadline) {
return fmt.Errorf("timeout out after %s", timeout.String())
}
time.Sleep(pollPeriod)
}
}
func newApp(c config) *app {
transport := c.Transport
if nil == transport {
transport = collectorDefaultTransport
}
app := &app{
Logger: c.Logger,
config: c,
placeholderRun: newPlaceholderAppRun(c),
// This channel must be buffered since Shutdown makes a
// non-blocking send attempt.
initiateShutdown: make(chan time.Duration, 1),
shutdownStarted: make(chan struct{}),
shutdownComplete: make(chan struct{}),
connectChan: make(chan *appRun, 1),
collectorErrorChan: make(chan rpmResponse, 1),
dataChan: make(chan appData, appDataChanSize),
rpmControls: rpmControls{
License: c.License,
Client: &http.Client{
Transport: transport,
Timeout: collectorTimeout,
},
Logger: c.Logger,
},
}
app.Info("application created", map[string]interface{}{
"app": app.config.AppName,
"version": Version,
"enabled": app.config.Enabled,
"grpc-version": grpcVersion,
})
if app.config.Enabled {
if app.config.ServerlessMode.Enabled {
reply := newServerlessConnectReply(c)
app.run = newAppRun(c, reply)
app.serverless = newServerlessHarvest(c.Logger, os.Getenv)
} else {
go app.process()
go app.connectRoutine()
if app.config.RuntimeSampler.Enabled {
go runSampler(app, runtimeSamplerPeriod)
}
}
}
return app
}
func shouldUseTraceObserver(c config) bool {
return nil != c.traceObserverURL && c.SpanEvents.Enabled && c.DistributedTracer.Enabled
}
var (
_ internal.HarvestTestinger = &app{}
_ internal.Expect = &app{}
)
func (app *app) HarvestTesting(replyfn func(*internal.ConnectReply)) {
if nil != replyfn {
reply := internal.ConnectReplyDefaults()
replyfn(reply)
app.placeholderRun = newAppRun(app.config, reply)
}
app.testHarvest = newHarvest(time.Now(), app.placeholderRun.harvestConfig)
}
func (app *app) getState() (*appRun, error) {
app.RLock()
defer app.RUnlock()
run := app.run
if nil == run {
run = app.placeholderRun
}
return run, app.err
}
func (app *app) setState(run *appRun, err error) {
app.Lock()
defer app.Unlock()
app.run = run
app.err = err
}
func (app *app) getObserver() traceObserver {
app.RLock()
defer app.RUnlock()
return app.trObserver
}
func (app *app) setObserver(observer traceObserver) {
app.Lock()
defer app.Unlock()
app.trObserver = observer
}
func newTransaction(thd *thread) *Transaction {
return &Transaction{
Private: thd,
thread: thd,
}
}
// StartTransaction implements newrelic.Application's StartTransaction.
func (app *app) StartTransaction(name string, opts ...TraceOption) *Transaction {
if nil == app {
return nil
}
run, _ := app.getState()
return newTransaction(newTxn(app, run, name, opts...))
}
var (
errHighSecurityEnabled = errors.New("high security enabled")
errCustomEventsDisabled = errors.New("custom events disabled")
errCustomEventsRemoteDisabled = errors.New("custom events disabled by server")
)
// RecordCustomEvent implements newrelic.Application's RecordCustomEvent.
func (app *app) RecordCustomEvent(eventType string, params map[string]interface{}) error {
if nil == app {
return nil
}
if app.config.Config.HighSecurity {
return errHighSecurityEnabled
}
if !app.config.CustomInsightsEvents.Enabled {
return errCustomEventsDisabled
}
event, e := createCustomEvent(eventType, params, time.Now())
if nil != e {
return e
}
run, _ := app.getState()
if !run.Reply.CollectCustomEvents {
return errCustomEventsRemoteDisabled
}
if !run.Reply.SecurityPolicies.CustomEvents.Enabled() {
return errSecurityPolicy
}
app.Consume(run.Reply.RunID, event)
return nil
}
var (
errMetricInf = errors.New("invalid metric value: inf")
errMetricNaN = errors.New("invalid metric value: NaN")
errMetricNameEmpty = errors.New("missing metric name")
errMetricServerless = errors.New("custom metrics are not currently supported in serverless mode")
)
// RecordCustomMetric implements newrelic.Application's RecordCustomMetric.
func (app *app) RecordCustomMetric(name string, value float64) error {
if nil == app {
return nil
}
if app.config.ServerlessMode.Enabled {
return errMetricServerless
}
if math.IsNaN(value) {
return errMetricNaN
}
if math.IsInf(value, 0) {
return errMetricInf
}
if "" == name {
return errMetricNameEmpty
}
run, _ := app.getState()
app.Consume(run.Reply.RunID, customMetric{
RawInputName: name,
Value: value,
})
return nil
}
var (
errAppLoggingDisabled = errors.New("log data can not be recorded when application logging is disabled")
)
// RecordLog implements newrelic.Application's RecordLog.
func (app *app) RecordLog(log *LogData) error {
if !app.config.ApplicationLogging.Enabled {
return errAppLoggingDisabled
}
event, err := log.toLogEvent()
if err != nil {
return err
}
run, _ := app.getState()
app.Consume(run.Reply.RunID, &event)
return nil
}
var (
_ internal.ServerlessWriter = &app{}
)
func (app *app) ServerlessWrite(arn string, writer io.Writer) {
app.serverless.Write(arn, writer)
}
func (app *app) Consume(id internal.AgentRunID, data harvestable) {
app.serverless.Consume(data)
if nil != app.testHarvest {
data.MergeIntoHarvest(app.testHarvest)
return
}
if "" == id {
return
}
select {
case app.dataChan <- appData{id, data}:
case <-app.shutdownStarted:
}
}
func (app *app) ExpectCustomEvents(t internal.Validator, want []internal.WantEvent) {
expectCustomEvents(extendValidator(t, "custom events"), app.testHarvest.CustomEvents, want)
}
// ExpectLogEvents from app checks that the contents of the logs test harvest matches the list of WantLogs.
func (app *app) ExpectLogEvents(t internal.Validator, want []internal.WantLog) {
expectLogEvents(extendValidator(t, "log events"), app.testHarvest.LogEvents, want)
}
// ExpectLogEvents from transactions dumps all the log events from a transaction into the test harvest
// then checks that the contents of the logs harvest matches the list of WantLogs.
func (txn *Transaction) ExpectLogEvents(t internal.Validator, want []internal.WantLog) {
txn.thread.MergeIntoHarvest(txn.Application().app.testHarvest)
expectLogEvents(extendValidator(t, "log events"), txn.Application().app.testHarvest.LogEvents, want)
}
func (app *app) ExpectErrors(t internal.Validator, want []internal.WantError) {
t = extendValidator(t, "traced errors")
expectErrors(t, app.testHarvest.ErrorTraces, want)
}
func (app *app) ExpectErrorEvents(t internal.Validator, want []internal.WantEvent) {
t = extendValidator(t, "error events")
expectErrorEvents(t, app.testHarvest.ErrorEvents, want)
}
func (app *app) ExpectSpanEvents(t internal.Validator, want []internal.WantEvent) {
t = extendValidator(t, "spans events")
expectSpanEvents(t, app.testHarvest.SpanEvents, want)
}
func (app *app) ExpectTxnEvents(t internal.Validator, want []internal.WantEvent) {
t = extendValidator(t, "txn events")
expectTxnEvents(t, app.testHarvest.TxnEvents, want)
}
func (app *app) ExpectMetrics(t internal.Validator, want []internal.WantMetric) {
t = extendValidator(t, "metrics")
expectMetrics(t, app.testHarvest.Metrics, want)
}
func (app *app) ExpectMetricsPresent(t internal.Validator, want []internal.WantMetric) {
t = extendValidator(t, "metrics")
expectMetricsPresent(t, app.testHarvest.Metrics, want)
}
func (app *app) ExpectTxnMetrics(t internal.Validator, want internal.WantTxn) {
t = extendValidator(t, "metrics")
expectTxnMetrics(t, app.testHarvest.Metrics, want)
}
func (app *app) ExpectTxnTraces(t internal.Validator, want []internal.WantTxnTrace) {
t = extendValidator(t, "txn traces")
expectTxnTraces(t, app.testHarvest.TxnTraces, want)
}
func (app *app) ExpectSlowQueries(t internal.Validator, want []internal.WantSlowQuery) {
t = extendValidator(t, "slow queries")
expectSlowQueries(t, app.testHarvest.SlowSQLs, want)
}