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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"
"net/http/httptest"
"testing"
"time"
"github.com/stretchr/testify/require"
"go.amzn.com/lambda/core/statejson"
"go.amzn.com/lambda/interop"
"go.amzn.com/lambda/rapidcore/env"
)
func waitForChanWithTimeout(channel <-chan error, timeout time.Duration) error {
select {
case err := <-channel:
return err
case <-time.After(timeout):
return nil
}
}
func sendInitSuccessResponse(responseChannel chan<- interop.InitSuccess, msg interop.InitSuccess) {
msg.Ack = make(chan struct{})
responseChannel <- msg
<-msg.Ack
}
func sendInitFailureResponse(responseChannel chan<- interop.InitFailure, msg interop.InitFailure) {
msg.Ack = make(chan struct{})
responseChannel <- msg
<-msg.Ack
}
type mockRapidCtx struct {
initHandler func(success chan<- interop.InitSuccess, fail chan<- interop.InitFailure)
invokeHandler func() (interop.InvokeSuccess, *interop.InvokeFailure)
resetHandler func() (interop.ResetSuccess, *interop.ResetFailure)
}
func (r *mockRapidCtx) HandleInit(init *interop.Init, successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
r.initHandler(successResp, failureResp)
}
func (r *mockRapidCtx) HandleInvoke(invoke *interop.Invoke, sbInfoFromInit interop.SandboxInfoFromInit, buf *bytes.Buffer, responseSender interop.InvokeResponseSender) (interop.InvokeSuccess, *interop.InvokeFailure) {
return r.invokeHandler()
}
func (r *mockRapidCtx) HandleReset(reset *interop.Reset) (interop.ResetSuccess, *interop.ResetFailure) {
return r.resetHandler()
}
func (r *mockRapidCtx) HandleShutdown(shutdown *interop.Shutdown) interop.ShutdownSuccess {
return interop.ShutdownSuccess{}
}
func (r *mockRapidCtx) HandleRestore(restore *interop.Restore) (interop.RestoreResult, error) {
return interop.RestoreResult{}, nil
}
func (r *mockRapidCtx) Clear() {}
func (r *mockRapidCtx) SetRuntimeStartedTime(a int64) {
}
func (r *mockRapidCtx) SetInvokeResponseMetrics(a *interop.InvokeResponseMetrics) {
}
func (r *mockRapidCtx) SetEventsAPI(e interop.EventsAPI) {
}
func TestReserveDoesNotDeadlockWhenCalledMultipleTimes(t *testing.T) {
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
sendInitSuccessResponse(successResp, interop.InitSuccess{})
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{
initHandler,
func() (interop.InvokeSuccess, *interop.InvokeFailure) { return interop.InvokeSuccess{}, nil },
func() (interop.ResetSuccess, *interop.ResetFailure) { return interop.ResetSuccess{}, nil },
}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
_, err := srv.Reserve("", "", "") // reserve successfully
require.NoError(t, err)
resp, err := srv.Reserve("", "", "") // attempt double reservation
require.Nil(t, resp)
require.Equal(t, ErrAlreadyReserved, err)
successChan := make(chan error)
go func() {
resp, err := srv.Reserve("", "", "")
require.Nil(t, resp)
require.Equal(t, ErrAlreadyReserved, err)
successChan <- nil
}()
select {
case <-time.After(1 * time.Second):
require.Fail(t, "Timed out while waiting for Reserve() response")
case <-successChan:
}
}
func TestInitSuccess(t *testing.T) {
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
sendInitSuccessResponse(successResp, interop.InitSuccess{})
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{
initHandler,
func() (interop.InvokeSuccess, *interop.InvokeFailure) { return interop.InvokeSuccess{}, nil },
func() (interop.ResetSuccess, *interop.ResetFailure) { return interop.ResetSuccess{}, nil },
}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
require.Equal(t, phaseInitializing, srv.getRapidPhase())
_, err := srv.Reserve("", "", "")
require.NoError(t, err)
}
func TestInitErrorBeforeReserve(t *testing.T) {
// Rapid thread sending init failure should not be blocked even if reserve hasn't arrived
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initErrorResponseSent := make(chan error)
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
require.NoError(t, srv.SendInitErrorResponse(&interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'A.B' }")}))
sendInitFailureResponse(failureResp, interop.InitFailure{})
initErrorResponseSent <- errors.New("initErrorResponseSent")
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{
initHandler,
func() (interop.InvokeSuccess, *interop.InvokeFailure) { return interop.InvokeSuccess{}, nil },
func() (interop.ResetSuccess, *interop.ResetFailure) { return interop.ResetSuccess{}, nil },
}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
if msg := waitForChanWithTimeout(initErrorResponseSent, 1*time.Second); msg == nil {
require.Fail(t, "Timed out waiting for init error response to be sent")
}
resp, err := srv.Reserve("", "", "")
require.NoError(t, err)
require.True(t, len(resp.Token.InvokeID) > 0)
awaitInitErr := srv.AwaitInitialized()
require.Error(t, ErrInitDoneFailed, awaitInitErr)
_, err = srv.AwaitRelease()
require.Error(t, err, ErrReleaseReservationDone)
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
func TestInitErrorDuringReserve(t *testing.T) {
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
require.NoError(t, srv.SendInitErrorResponse(&interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'A.B' }")}))
sendInitFailureResponse(failureResp, interop.InitFailure{})
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{
initHandler,
func() (interop.InvokeSuccess, *interop.InvokeFailure) { return interop.InvokeSuccess{}, nil },
func() (interop.ResetSuccess, *interop.ResetFailure) { return interop.ResetSuccess{}, nil },
}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
resp, err := srv.Reserve("", "", "")
require.NoError(t, err)
require.True(t, len(resp.Token.InvokeID) > 0)
awaitInitErr := srv.AwaitInitialized()
require.Error(t, ErrInitDoneFailed, awaitInitErr)
_, err = srv.AwaitRelease()
require.Error(t, err, ErrReleaseReservationDone)
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
func TestInvokeSuccess(t *testing.T) {
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
releaseRuntimeInit := make(chan struct{})
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
<-releaseRuntimeInit
sendInitSuccessResponse(successResp, interop.InitSuccess{})
}
invokeHandler := func() (interop.InvokeSuccess, *interop.InvokeFailure) {
response := &interop.StreamableInvokeResponse{Headers: map[string]string{"Content-Type": "application/json"}, Payload: bytes.NewReader([]byte("response"))}
require.NoError(t, srv.SendResponse(srv.GetCurrentInvokeID(), response))
require.NoError(t, srv.SendRuntimeReady())
return interop.InvokeSuccess{}, nil
}
resetHandler := func() (interop.ResetSuccess, *interop.ResetFailure) { return interop.ResetSuccess{}, nil }
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{initHandler, invokeHandler, resetHandler}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
require.Equal(t, phaseInitializing, srv.getRapidPhase())
releaseRuntimeInit <- struct{}{}
_, err := srv.Reserve("", "", "")
require.NoError(t, err)
require.Equal(t, phaseInitializing, srv.getRapidPhase()) // Reserve does not wait for init completion
awaitInitErr := srv.AwaitInitialized()
require.NoError(t, awaitInitErr)
responseRecorder := httptest.NewRecorder()
invokeErr := srv.FastInvoke(responseRecorder, &interop.Invoke{}, false)
require.NoError(t, invokeErr)
require.Equal(t, "response", responseRecorder.Body.String())
require.Equal(t, "application/json", responseRecorder.Result().Header.Get("Content-Type"))
_, err = srv.AwaitRelease()
require.NoError(t, err)
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
func TestInvokeError(t *testing.T) {
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
sendInitSuccessResponse(successResp, interop.InitSuccess{})
}
invokeHandler := func() (interop.InvokeSuccess, *interop.InvokeFailure) {
headers := interop.InvokeResponseHeaders{ContentType: "application/json"}
require.NoError(t, srv.SendErrorResponse(srv.GetCurrentInvokeID(), &interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'A.B' }"), Headers: headers}))
require.NoError(t, srv.SendRuntimeReady())
return interop.InvokeSuccess{}, nil
}
resetHandler := func() (interop.ResetSuccess, *interop.ResetFailure) {
return interop.ResetSuccess{}, nil
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{initHandler, invokeHandler, resetHandler}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
require.Equal(t, phaseInitializing, srv.getRapidPhase())
_, err := srv.Reserve("", "", "")
require.NoError(t, err)
require.Equal(t, phaseInitializing, srv.getRapidPhase())
awaitInitErr := srv.AwaitInitialized()
require.NoError(t, awaitInitErr)
responseRecorder := httptest.NewRecorder()
invokeErr := srv.FastInvoke(responseRecorder, &interop.Invoke{}, false)
require.NoError(t, invokeErr)
require.Equal(t, "{ 'errorType': 'A.B' }", responseRecorder.Body.String())
require.Equal(t, "application/json", responseRecorder.Result().Header.Get("Content-Type"))
_, err = srv.AwaitRelease()
require.NoError(t, err)
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
func TestInvokeWithSuppressedInitSuccess(t *testing.T) {
// Tests an init/error followed by suppressed init:
// Runtime may have called init/error before Reserve, in which case we
// expect a suppressed init, i.e. init during the invoke.
// The first Reserve() after init/error returns ErrInitError because
// SendDoneFail was called on init/error.
// We expect the caller to then call Reset() to prepare for suppressed init,
// followed by Reserve() so that a valid reservation context is available.
// Reserve() returns ErrInitAlreadyDone, since the server implementation
// closes the InitDone channel after the first InitDone message.
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initErrorCompleted := make(chan error)
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
require.NoError(t, srv.SendInitErrorResponse(&interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'A.B' }")}))
sendInitFailureResponse(failureResp, interop.InitFailure{})
initErrorCompleted <- errors.New("initErrorSequenceCompleted")
}
invokeHandler := func() (interop.InvokeSuccess, *interop.InvokeFailure) {
response := &interop.StreamableInvokeResponse{Payload: bytes.NewReader([]byte("response"))}
require.NoError(t, srv.SendResponse(srv.GetCurrentInvokeID(), response))
return interop.InvokeSuccess{}, nil
}
resetHandler := func() (interop.ResetSuccess, *interop.ResetFailure) {
return interop.ResetSuccess{}, nil
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{initHandler, invokeHandler, resetHandler}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
require.Equal(t, phaseInitializing, srv.getRapidPhase())
if msg := waitForChanWithTimeout(initErrorCompleted, 1*time.Second); msg == nil {
require.Fail(t, "Timed out waiting for init error sequence to be called")
}
resp, err := srv.Reserve("", "", "")
require.NoError(t, err)
require.True(t, len(resp.Token.InvokeID) > 0)
awaitInitErr := srv.AwaitInitialized()
require.Error(t, ErrInitDoneFailed, awaitInitErr)
_, err = srv.Reset(autoresetReasonReserveFail, resetDefaultTimeoutMs) // prepare for suppressed init
require.NoError(t, err)
_, err = srv.Reserve("", "", "")
require.NoError(t, err)
responseRecorder := httptest.NewRecorder()
successChan := make(chan error)
go func() {
directInvoke := false
invokeErr := srv.FastInvoke(responseRecorder, &interop.Invoke{}, directInvoke)
require.NoError(t, invokeErr)
successChan <- errors.New("invokeResponseWritten")
}()
invokeErr := waitForChanWithTimeout(successChan, 1*time.Second)
if invokeErr == nil {
require.Fail(t, "Timed out while waiting for invoke response")
}
require.Equal(t, "response", responseRecorder.Body.String())
_, err = srv.AwaitRelease()
require.NoError(t, err)
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
func TestInvokeWithSuppressedInitErrorDueToInitError(t *testing.T) {
// Tests init/error followed by init/error during suppressed init
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
require.NoError(t, srv.SendInitErrorResponse(&interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'A.B' }")}))
sendInitFailureResponse(failureResp, interop.InitFailure{})
}
releaseChan := make(chan error)
invokeHandler := func() (interop.InvokeSuccess, *interop.InvokeFailure) {
require.NoError(t, srv.SendErrorResponse(srv.GetCurrentInvokeID(), &interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'A.B' }")}))
releaseChan <- nil
return interop.InvokeSuccess{}, &interop.InvokeFailure{ErrorType: "A.B", RequestReset: true, DefaultErrorResponse: &interop.ErrorInvokeResponse{}}
}
resetHandler := func() (interop.ResetSuccess, *interop.ResetFailure) {
return interop.ResetSuccess{}, nil
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{initHandler, invokeHandler, resetHandler}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
resp, err := srv.Reserve("", "", "")
require.NoError(t, err)
require.True(t, len(resp.Token.InvokeID) > 0)
require.Equal(t, phaseInitializing, srv.getRapidPhase())
awaitInitErr := srv.AwaitInitialized()
require.Error(t, ErrInitDoneFailed, awaitInitErr)
_, err = srv.Reset(autoresetReasonReserveFail, resetDefaultTimeoutMs) // prepare for invoke with suppressed init
require.NoError(t, err)
require.Equal(t, phaseIdle, srv.getRapidPhase())
_, err = srv.Reserve("", "", "")
require.NoError(t, err)
require.Equal(t, phaseIdle, srv.getRapidPhase())
responseRecorder := httptest.NewRecorder()
invokeErr := srv.FastInvoke(responseRecorder, &interop.Invoke{}, false)
require.NoError(t, invokeErr)
require.Equal(t, "{ 'errorType': 'A.B' }", responseRecorder.Body.String())
require.Equal(t, phaseInvoking, srv.getRapidPhase())
<-releaseChan // Unblock gorotune to send donefail
_, err = srv.AwaitRelease()
require.EqualError(t, err, ErrInvokeDoneFailed.Error())
require.Equal(t, phaseIdle, srv.getRapidPhase())
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
func TestInvokeWithSuppressedInitErrorDueToInvokeError(t *testing.T) {
// Tests init/error followed by init/error during suppressed init
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
require.NoError(t, srv.SendInitErrorResponse(&interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'A.B' }")}))
sendInitFailureResponse(failureResp, interop.InitFailure{})
}
invokeHandler := func() (interop.InvokeSuccess, *interop.InvokeFailure) {
require.NoError(t, srv.SendInitErrorResponse(&interop.ErrorInvokeResponse{Payload: []byte("{ 'errorType': 'B.C' }")}))
require.NoError(t, srv.SendRuntimeReady())
return interop.InvokeSuccess{}, nil
}
resetHandler := func() (interop.ResetSuccess, *interop.ResetFailure) {
return interop.ResetSuccess{}, nil
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{initHandler, invokeHandler, resetHandler}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
require.Equal(t, phaseInitializing, srv.getRapidPhase())
resp, err := srv.Reserve("", "", "")
require.NoError(t, err)
require.True(t, len(resp.Token.InvokeID) > 0)
awaitInitErr := srv.AwaitInitialized()
require.Error(t, ErrInitDoneFailed, awaitInitErr)
_, err = srv.Reset(autoresetReasonReserveFail, resetDefaultTimeoutMs) // prepare for invoke with suppressed init
require.NoError(t, err)
require.Equal(t, phaseIdle, srv.getRapidPhase())
_, err = srv.Reserve("", "", "")
require.NoError(t, err)
require.Equal(t, phaseIdle, srv.getRapidPhase())
responseRecorder := httptest.NewRecorder()
invokeErr := srv.FastInvoke(responseRecorder, &interop.Invoke{}, false)
require.NoError(t, invokeErr)
require.Equal(t, "{ 'errorType': 'B.C' }", responseRecorder.Body.String())
_, err = srv.AwaitRelease()
require.NoError(t, err) // /invocation/error -> /invocation/next returns no error / donefail
require.Equal(t, phaseIdle, srv.getRapidPhase())
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
func TestMultipleInvokeSuccess(t *testing.T) {
srv := NewServer()
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return statejson.InternalStateDescription{} })
initHandler := func(successResp chan<- interop.InitSuccess, failureResp chan<- interop.InitFailure) {
sendInitSuccessResponse(successResp, interop.InitSuccess{})
}
i := 0
invokeHandler := func() (interop.InvokeSuccess, *interop.InvokeFailure) {
response := &interop.StreamableInvokeResponse{Payload: bytes.NewReader([]byte("response-" + fmt.Sprint(i)))}
require.NoError(t, srv.SendResponse(srv.GetCurrentInvokeID(), response))
require.NoError(t, srv.SendRuntimeReady())
i++
return interop.InvokeSuccess{}, nil
}
resetHandler := func() (interop.ResetSuccess, *interop.ResetFailure) {
return interop.ResetSuccess{}, nil
}
srv.SetSandboxContext(&SandboxContext{&mockRapidCtx{initHandler, invokeHandler, resetHandler}, "handler", "runtimeAPIhost:999"})
srv.Init(&interop.Init{EnvironmentVariables: env.NewEnvironment()}, int64(1*time.Second*time.Millisecond))
require.Equal(t, phaseInitializing, srv.getRapidPhase())
for i := 0; i < 3; i++ {
_, err := srv.Reserve("", "", "")
require.NoError(t, err)
awaitInitErr := srv.AwaitInitialized()
require.NoError(t, awaitInitErr)
responseRecorder := httptest.NewRecorder()
invokeErr := srv.FastInvoke(responseRecorder, &interop.Invoke{}, false)
require.NoError(t, invokeErr)
require.Equal(t, "response-"+fmt.Sprint(i), responseRecorder.Body.String())
require.Equal(t, phaseInvoking, srv.getRapidPhase())
_, err = srv.AwaitRelease()
require.NoError(t, err)
require.Equal(t, phaseIdle, srv.getRapidPhase())
require.Equal(t, runtimeState(runtimeInvokeComplete), srv.getRuntimeState())
}
}
func TestAwaitReleaseOnSuccess(t *testing.T) {
srv := NewServer()
// mocks
internalStateDescription := statejson.InternalStateDescription{}
srv.SetInternalStateGetter(func() statejson.InternalStateDescription { return internalStateDescription })
doneWithState := DoneWithState{
State: internalStateDescription,
Done: &interop.Done{
Meta: interop.DoneMetadata{
RuntimeResponseLatencyMs: 12345,
MetricsDimensions: interop.DoneMetadataMetricsDimensions{
InvokeResponseMode: interop.InvokeResponseModeStreaming,
},
},
},
}
srv.InvokeDoneChan <- doneWithState
srv.reservationContext, srv.reservationCancel = context.WithCancel(context.Background())
// under test
responseAwaitRelease, err := srv.AwaitRelease()
// assertions
require.NoError(t, err)
require.Equal(t, doneWithState.Done.Meta.RuntimeResponseLatencyMs, responseAwaitRelease.ResponseMetrics.RuntimeResponseLatencyMs)
require.Equal(t, string(doneWithState.Done.Meta.MetricsDimensions.InvokeResponseMode), string(responseAwaitRelease.ResponseMetrics.Dimensions.InvokeResponseMode))
require.Equal(t, &doneWithState.State, responseAwaitRelease.InternalStateDescription)
}
/* Unit tests remaining:
- Shutdown behaviour
- Reset behaviour during various phases
- Runtime / extensions process exit sequences
- Invoke() and Init() api tests
- How can we add handleRestore test here?
See PlantUML state diagram for potential other uncovered paths
through the state machine
*/