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server.go
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server.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package rapidcore
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"math"
"net/http"
"sync"
"time"
"go.amzn.com/lambda/core/directinvoke"
"go.amzn.com/lambda/core/statejson"
"go.amzn.com/lambda/interop"
"go.amzn.com/lambda/metering"
"github.com/google/uuid"
log "github.com/sirupsen/logrus"
)
const (
autoresetReasonTimeout = "Timeout"
autoresetReasonReserveFail = "ReserveFail"
autoresetReasonReleaseFail = "ReleaseFail"
standaloneVersionID = "1"
resetDefaultTimeoutMs = 2000
)
type rapidPhase int
const (
phaseIdle rapidPhase = iota
phaseInitializing
phaseInvoking
)
type runtimeState int
const (
runtimeNotStarted = iota
runtimeInitStarted
runtimeInitError
runtimeInitComplete
runtimeInitFailed
runtimeInvokeResponseSent
runtimeInvokeError
runtimeReady
runtimeInvokeComplete
)
type DoneWithState struct {
*interop.Done
State statejson.InternalStateDescription
}
func (s *DoneWithState) String() string {
return fmt.Sprintf("%v %v", *s.Done, string(s.State.AsJSON()))
}
type InvokeContext struct {
Token interop.Token
ReplySent bool
ReplyStream http.ResponseWriter
Direct bool
}
type Server struct {
InternalStateGetter interop.InternalStateGetter
invokeChanOut chan *interop.Invoke
startChanOut chan *interop.Start
resetChanOut chan *interop.Reset
shutdownChanOut chan *interop.Shutdown
errorChanOut chan error
sendRunningChan chan *interop.Running
sendResponseChan chan struct{}
doneChan chan *interop.Done
InitDoneChan chan DoneWithState
InvokeDoneChan chan DoneWithState
ResetDoneChan chan *interop.Done
ShutdownDoneChan chan *interop.Done
mutex sync.Mutex
invokeCtx *InvokeContext
invokeTimeout time.Duration
reservationContext context.Context
reservationCancel func()
rapidPhase rapidPhase
runtimeState runtimeState
}
func (s *Server) StartAcceptingDirectInvokes() error {
return nil
}
func (s *Server) setRapidPhase(phase rapidPhase) {
s.mutex.Lock()
defer s.mutex.Unlock()
s.rapidPhase = phase
}
func (s *Server) getRapidPhase() rapidPhase {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.rapidPhase
}
func (s *Server) setRuntimeState(state runtimeState) {
s.mutex.Lock()
defer s.mutex.Unlock()
s.runtimeState = state
}
func (s *Server) getRuntimeState() runtimeState {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.runtimeState
}
func (s *Server) SetInvokeTimeout(timeout time.Duration) {
s.mutex.Lock()
defer s.mutex.Unlock()
s.invokeTimeout = timeout
}
func (s *Server) GetInvokeTimeout() time.Duration {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.invokeTimeout
}
func (s *Server) GetInvokeContext() *InvokeContext {
s.mutex.Lock()
defer s.mutex.Unlock()
ctx := *s.invokeCtx
return &ctx
}
func (s *Server) setNewInvokeContext(invokeID string, traceID, lambdaSegmentID string) (*ReserveResponse, error) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.invokeCtx != nil {
return nil, ErrAlreadyReserved
}
s.invokeCtx = &InvokeContext{
Token: interop.Token{
ReservationToken: uuid.New().String(),
InvokeID: invokeID,
VersionID: standaloneVersionID,
FunctionTimeout: s.invokeTimeout,
TraceID: traceID,
LambdaSegmentID: lambdaSegmentID,
InvackDeadlineNs: math.MaxInt64, // no INVACK in standalone
},
}
resp := &ReserveResponse{
Token: s.invokeCtx.Token,
}
s.reservationContext, s.reservationCancel = context.WithCancel(context.Background())
return resp, nil
}
// Reserve allocates invoke context
func (s *Server) Reserve(id string, traceID, lambdaSegmentID string) (*ReserveResponse, error) {
invokeID := uuid.New().String()
if len(id) > 0 {
invokeID = id
}
resp, err := s.setNewInvokeContext(invokeID, traceID, lambdaSegmentID)
if err != nil {
return nil, err
}
resp.InternalState, err = s.waitInit()
return resp, err
}
func (s *Server) waitInit() (*statejson.InternalStateDescription, error) {
for {
select {
case doneWithState, chanOpen := <-s.InitDoneChan:
if !chanOpen {
// init only happens once
return nil, ErrInitAlreadyDone
}
close(s.InitDoneChan) // this was first call to reserve
if s.getRuntimeState() == runtimeInitFailed {
return &doneWithState.State, ErrInitError
}
if len(doneWithState.ErrorType) > 0 {
log.Errorf("INIT DONE failed: %s", doneWithState.ErrorType)
return &doneWithState.State, ErrInitDoneFailed
}
return &doneWithState.State, nil
case <-s.reservationContext.Done():
return nil, ErrReserveReservationDone
}
}
}
func (s *Server) setReplyStream(w http.ResponseWriter, direct bool) (string, error) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.invokeCtx == nil {
return "", ErrNotReserved
}
if s.invokeCtx.ReplySent {
return "", ErrAlreadyReplied
}
if s.invokeCtx.ReplyStream != nil {
return "", ErrAlreadyInvocating
}
s.invokeCtx.ReplyStream = w
s.invokeCtx.Direct = direct
return s.invokeCtx.Token.InvokeID, nil
}
// Release closes the invocation, making server ready for reserve again
func (s *Server) Release() error {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.invokeCtx == nil {
return ErrNotReserved
}
if s.reservationCancel != nil {
s.reservationCancel()
}
s.invokeCtx = nil
return nil
}
// GetCurrentInvokeID
func (s *Server) GetCurrentInvokeID() string {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.invokeCtx == nil {
return ""
}
return s.invokeCtx.Token.InvokeID
}
// SetInternalStateGetter is used to set callback which returnes internal state for /test/internalState request
func (s *Server) SetInternalStateGetter(cb interop.InternalStateGetter) {
s.InternalStateGetter = cb
}
// StartChan returns Start emitter
func (s *Server) StartChan() <-chan *interop.Start {
return s.startChanOut
}
// InvokeChan returns Invoke emitter
func (s *Server) InvokeChan() <-chan *interop.Invoke {
return s.invokeChanOut
}
// ResetChan returns Reset emitter
func (s *Server) ResetChan() <-chan *interop.Reset {
return s.resetChanOut
}
// ShutdownChan returns Shutdown emitter
func (s *Server) ShutdownChan() <-chan *interop.Shutdown {
return s.shutdownChanOut
}
// InvalidMessageChan emits errors if there was something we could not parse
func (s *Server) TransportErrorChan() <-chan error {
return s.errorChanOut
}
func (s *Server) sendResponseUnsafe(invokeID string, contentType string, status int, payload io.Reader) error {
if s.invokeCtx == nil || invokeID != s.invokeCtx.Token.InvokeID {
return interop.ErrInvalidInvokeID
}
if s.invokeCtx.ReplySent {
return interop.ErrResponseSent
}
if s.invokeCtx.ReplyStream == nil {
return fmt.Errorf("ReplyStream not available")
}
// TODO: earlier, status was set to 500 if runtime called /invocation/error. However, the integration
// tests do not differentiate between /invocation/error and /invocation/response, but they check the error type:
// To identify user-errors, we should also allowlist custom errortypes and propagate them via headers.
// s.invokeCtx.ReplyStream.WriteHeader(status)
var reportedErr error
if s.invokeCtx.Direct {
if err := directinvoke.SendDirectInvokeResponse(map[string]string{"Content-Type": contentType}, payload, s.invokeCtx.ReplyStream); err != nil {
// TODO: Do we need to drain the reader in case of a large payload and connection reuse?
log.Errorf("Failed to write response to %s: %s", invokeID, err)
flusher, ok := s.invokeCtx.ReplyStream.(http.Flusher)
if !ok {
log.Error("Failed to flush response")
}
flusher.Flush()
reportedErr = err
}
} else {
data, err := ioutil.ReadAll(payload)
if err != nil {
return fmt.Errorf("Failed to read response on %s: %s", invokeID, err)
}
if len(data) > interop.MaxPayloadSize {
return &interop.ErrorResponseTooLarge{
ResponseSize: len(data),
MaxResponseSize: interop.MaxPayloadSize,
}
}
s.invokeCtx.ReplyStream.Header().Add("Content-Type", contentType)
if _, err := s.invokeCtx.ReplyStream.Write(data); err != nil {
return fmt.Errorf("Failed to write response to %s: %s", invokeID, err)
}
}
s.sendResponseChan <- struct{}{}
s.invokeCtx.ReplySent = true
s.invokeCtx.Direct = false
return reportedErr
}
func (s *Server) SendResponse(invokeID string, contentType string, reader io.Reader) error {
s.setRuntimeState(runtimeInvokeResponseSent)
s.mutex.Lock()
defer s.mutex.Unlock()
return s.sendResponseUnsafe(invokeID, contentType, http.StatusOK, reader)
}
func (s *Server) CommitResponse() error { return nil }
func (s *Server) SendRunning(run *interop.Running) error {
s.setRuntimeState(runtimeInitStarted)
s.sendRunningChan <- run
return nil
}
func (s *Server) SendErrorResponse(invokeID string, resp *interop.ErrorResponse) error {
switch s.getRapidPhase() {
case phaseInitializing:
s.setRuntimeState(runtimeInitError)
return nil
case phaseInvoking:
// This branch can also occur during a suppressed init error, which is reported as invoke error
s.setRuntimeState(runtimeInvokeError)
s.mutex.Lock()
defer s.mutex.Unlock()
return s.sendResponseUnsafe(invokeID, resp.ContentType, http.StatusInternalServerError, bytes.NewReader(resp.Payload))
default:
panic("received unexpected error response outside invoke or init phases")
}
}
func (s *Server) SendDone(done *interop.Done) error {
s.doneChan <- done
return nil
}
func (s *Server) SendDoneFail(doneFail *interop.DoneFail) error {
s.doneChan <- &interop.Done{
ErrorType: doneFail.ErrorType,
CorrelationID: doneFail.CorrelationID, // filipovi: correlationID is required to dispatch message into correct channel
Meta: doneFail.Meta,
}
return nil
}
func (s *Server) Reset(reason string, timeoutMs int64) (*statejson.ResetDescription, error) {
// pass reset to rapid
s.resetChanOut <- &interop.Reset{
Reason: reason,
DeadlineNs: deadlineNsFromTimeoutMs(timeoutMs),
CorrelationID: "resetCorrelationID",
}
// TODO do not block on reset, instead consume ResetDoneChan in waitForRelease handler,
// this will get us more aligned on async reset notification handling.
done := <-s.ResetDoneChan
s.Release()
if done.ErrorType != "" {
return nil, errors.New(string(done.ErrorType))
}
return &statejson.ResetDescription{ExtensionsResetMs: done.Meta.ExtensionsResetMs}, nil
}
func NewServer(ctx context.Context) *Server {
s := &Server{
startChanOut: make(chan *interop.Start),
invokeChanOut: make(chan *interop.Invoke),
errorChanOut: make(chan error),
resetChanOut: make(chan *interop.Reset),
shutdownChanOut: make(chan *interop.Shutdown),
sendRunningChan: make(chan *interop.Running),
sendResponseChan: make(chan struct{}),
doneChan: make(chan *interop.Done),
// These two channels are buffered, because they are depleted asynchronously (by reserve and waitUntilRelease) and we don't want to block in SendDone until they are called
InitDoneChan: make(chan DoneWithState, 1),
InvokeDoneChan: make(chan DoneWithState, 1),
ResetDoneChan: make(chan *interop.Done),
ShutdownDoneChan: make(chan *interop.Done),
}
go s.dispatchDone()
return s
}
func (s *Server) setInitDoneRuntimeState(done *interop.Done) {
if len(done.ErrorType) > 0 {
s.setRuntimeState(runtimeInitFailed) // donefail
} else {
s.setRuntimeState(runtimeInitComplete) // done
}
}
// Note, the dispatch loop below has potential to block, when
// channel is not drained. E.g. if test assumes sandbox init
// completion before dispatching reset, then reset will block
// until init channel is drained.
func (s *Server) dispatchDone() {
for {
done := <-s.doneChan
log.Debug("Dispatching DONE:", done.CorrelationID)
internalState := s.InternalStateGetter()
s.setRapidPhase(phaseIdle)
if done.CorrelationID == "initCorrelationID" {
s.setInitDoneRuntimeState(done)
s.InitDoneChan <- DoneWithState{Done: done, State: internalState}
} else if done.CorrelationID == "invokeCorrelationID" {
s.setRuntimeState(runtimeInvokeComplete)
s.InvokeDoneChan <- DoneWithState{Done: done, State: internalState}
} else if done.CorrelationID == "resetCorrelationID" {
s.setRuntimeState(runtimeNotStarted)
s.ResetDoneChan <- done
} else if done.CorrelationID == "shutdownCorrelationID" {
s.setRuntimeState(runtimeNotStarted)
s.ShutdownDoneChan <- done
} else {
panic("Received DONE without correlation ID")
}
}
}
func drainChannel(c chan DoneWithState) {
for {
select {
case dws := <-c:
log.Warnf("Discard DONE response: %s", dws.String())
break
default:
return
}
}
}
func (s *Server) Clear() {
// we do not drain InitDoneChannel, because Init is only done once during rapid lifetime
drainChannel(s.InvokeDoneChan)
s.Release()
}
func (s *Server) IsResponseSent() bool {
panic("unexpected call to unimplemented method in rapidcore: IsResponseSent()")
}
func (s *Server) SendRuntimeReady() error {
// only called when extensions are enabled
s.setRuntimeState(runtimeReady)
return nil
}
func deadlineNsFromTimeoutMs(timeoutMs int64) int64 {
mono := metering.Monotime()
return mono + timeoutMs*1000*1000
}
func (s *Server) Init(i *interop.Start, invokeTimeoutMs int64) {
s.SetInvokeTimeout(time.Duration(invokeTimeoutMs) * time.Millisecond)
s.startChanOut <- i
s.setRapidPhase(phaseInitializing)
<-s.sendRunningChan
log.Debug("Received RUNNING")
}
func (s *Server) FastInvoke(w http.ResponseWriter, i *interop.Invoke, direct bool) error {
invokeID, err := s.setReplyStream(w, direct)
if err != nil {
return err
}
s.setRapidPhase(phaseInvoking)
i.ID = invokeID
select {
case s.invokeChanOut <- i:
break
case <-s.sendResponseChan:
// we didn't pass invoke to rapid yet, but rapid already has written some response
// It can happend if runtime/agent crashed even before we passed invoke to it
return ErrInvokeResponseAlreadyWritten
}
select {
case <-s.sendResponseChan:
break
case <-s.reservationContext.Done():
return ErrInvokeReservationDone
}
return nil
}
func (s *Server) CurrentToken() *interop.Token {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.invokeCtx == nil {
return nil
}
tok := s.invokeCtx.Token
return &tok
}
// Invoke is used by the Runtime Interface Emulator (Rapid Local)
// https://github.com/aws/aws-lambda-runtime-interface-emulator
func (s *Server) Invoke(responseWriter http.ResponseWriter, invoke *interop.Invoke) error {
resetCtx, resetCancel := context.WithCancel(context.Background())
defer resetCancel()
timeoutChan := make(chan error)
go func() {
select {
case <-time.After(s.GetInvokeTimeout()):
timeoutChan <- ErrInvokeTimeout
s.Reset(autoresetReasonTimeout, resetDefaultTimeoutMs)
case <-resetCtx.Done():
log.Debugf("execute finished, autoreset cancelled")
}
}()
reserveResp, err := s.Reserve(invoke.ID, "", "")
if err != nil {
switch err {
case ErrInitError:
// Simulate 'Suppressed Init' scenario
s.Reset(autoresetReasonReserveFail, resetDefaultTimeoutMs)
reserveResp, err = s.Reserve("", "", "")
if err == ErrInitAlreadyDone {
break
}
return err
case ErrInitDoneFailed, ErrTerminated:
s.Reset(autoresetReasonReserveFail, resetDefaultTimeoutMs)
return err
case ErrInitAlreadyDone:
// This is a valid response (e.g. for 2nd and 3rd invokes)
// TODO: switch on ReserveResponse status instead of err,
// since these are valid values
if s.InternalStateGetter == nil {
responseWriter.Write([]byte("error: internal state callback not set"))
return ErrInternalServerError
}
default:
return err
}
}
invoke.DeadlineNs = fmt.Sprintf("%d", metering.Monotime()+reserveResp.Token.FunctionTimeout.Nanoseconds())
invokeChan := make(chan error)
go func() {
if err := s.FastInvoke(responseWriter, invoke, false); err != nil {
invokeChan <- err
}
}()
releaseChan := make(chan error)
go func() {
_, err := s.AwaitRelease()
releaseChan <- err
}()
// TODO: verify the order of channel receives. When timeouts happen, Reset()
// is called first, which also does Release() => this may signal a type
// Err<*>ReservationDone error to the non-timeout channels. This is currently
// handled by the http handler, which returns GatewayTimeout for reservation errors
// too. However, Timeouts should ideally be only represented by ErrInvokeTimeout.
select {
case err = <-invokeChan:
case err = <-timeoutChan:
case err = <-releaseChan:
if err != nil {
s.Reset(autoresetReasonReleaseFail, resetDefaultTimeoutMs)
}
}
return err
}
func (s *Server) AwaitRelease() (*statejson.InternalStateDescription, error) {
select {
case doneWithState := <-s.InvokeDoneChan:
if len(doneWithState.ErrorType) > 0 {
log.Errorf("Invoke DONE failed: %s", doneWithState.ErrorType)
return nil, ErrInvokeDoneFailed
}
s.Release()
return &doneWithState.State, nil
case <-s.reservationContext.Done():
return nil, ErrReleaseReservationDone
}
}
func (s *Server) Shutdown(shutdown *interop.Shutdown) *statejson.InternalStateDescription {
s.shutdownChanOut <- shutdown
<-s.ShutdownDoneChan
state := s.InternalStateGetter()
return &state
}
func (s *Server) InternalState() (*statejson.InternalStateDescription, error) {
if s.InternalStateGetter == nil {
return nil, errors.New("InternalStateGetterNotSet")
}
state := s.InternalStateGetter()
return &state, nil
}