/
async_assertion.go
469 lines (407 loc) · 12.9 KB
/
async_assertion.go
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package internal
import (
"context"
"fmt"
"reflect"
"runtime"
"sync"
"time"
"errors"
"github.com/onsi/gomega/types"
)
type StopTryingError interface {
error
Now()
wasViaPanic() bool
}
func asStopTryingError(actual interface{}) (StopTryingError, bool) {
if actual == nil {
return nil, false
}
if actualErr, ok := actual.(error); ok {
var target *stopTryingError
if errors.As(actualErr, &target) {
return target, true
} else {
return nil, false
}
}
return nil, false
}
type stopTryingError struct {
message string
viaPanic bool
}
func (s *stopTryingError) Error() string {
return s.message
}
func (s *stopTryingError) Now() {
s.viaPanic = true
panic(s)
}
func (s *stopTryingError) wasViaPanic() bool {
return s.viaPanic
}
var StopTrying = func(message string) StopTryingError {
return &stopTryingError{message: message}
}
type AsyncAssertionType uint
const (
AsyncAssertionTypeEventually AsyncAssertionType = iota
AsyncAssertionTypeConsistently
)
func (at AsyncAssertionType) String() string {
switch at {
case AsyncAssertionTypeEventually:
return "Eventually"
case AsyncAssertionTypeConsistently:
return "Consistently"
}
return "INVALID ASYNC ASSERTION TYPE"
}
type AsyncAssertion struct {
asyncType AsyncAssertionType
actualIsFunc bool
actual interface{}
argsToForward []interface{}
timeoutInterval time.Duration
pollingInterval time.Duration
ctx context.Context
offset int
g *Gomega
}
func NewAsyncAssertion(asyncType AsyncAssertionType, actualInput interface{}, g *Gomega, timeoutInterval time.Duration, pollingInterval time.Duration, ctx context.Context, offset int) *AsyncAssertion {
out := &AsyncAssertion{
asyncType: asyncType,
timeoutInterval: timeoutInterval,
pollingInterval: pollingInterval,
offset: offset,
ctx: ctx,
g: g,
}
out.actual = actualInput
if actualInput != nil && reflect.TypeOf(actualInput).Kind() == reflect.Func {
out.actualIsFunc = true
}
return out
}
func (assertion *AsyncAssertion) WithOffset(offset int) types.AsyncAssertion {
assertion.offset = offset
return assertion
}
func (assertion *AsyncAssertion) WithTimeout(interval time.Duration) types.AsyncAssertion {
assertion.timeoutInterval = interval
return assertion
}
func (assertion *AsyncAssertion) WithPolling(interval time.Duration) types.AsyncAssertion {
assertion.pollingInterval = interval
return assertion
}
func (assertion *AsyncAssertion) Within(timeout time.Duration) types.AsyncAssertion {
assertion.timeoutInterval = timeout
return assertion
}
func (assertion *AsyncAssertion) ProbeEvery(interval time.Duration) types.AsyncAssertion {
assertion.pollingInterval = interval
return assertion
}
func (assertion *AsyncAssertion) WithContext(ctx context.Context) types.AsyncAssertion {
assertion.ctx = ctx
return assertion
}
func (assertion *AsyncAssertion) WithArguments(argsToForward ...interface{}) types.AsyncAssertion {
assertion.argsToForward = argsToForward
return assertion
}
func (assertion *AsyncAssertion) Should(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.g.THelper()
vetOptionalDescription("Asynchronous assertion", optionalDescription...)
return assertion.match(matcher, true, optionalDescription...)
}
func (assertion *AsyncAssertion) ShouldNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.g.THelper()
vetOptionalDescription("Asynchronous assertion", optionalDescription...)
return assertion.match(matcher, false, optionalDescription...)
}
func (assertion *AsyncAssertion) buildDescription(optionalDescription ...interface{}) string {
switch len(optionalDescription) {
case 0:
return ""
case 1:
if describe, ok := optionalDescription[0].(func() string); ok {
return describe() + "\n"
}
}
return fmt.Sprintf(optionalDescription[0].(string), optionalDescription[1:]...) + "\n"
}
func (assertion *AsyncAssertion) processReturnValues(values []reflect.Value) (interface{}, error, StopTryingError) {
var err error
var stopTrying StopTryingError
if len(values) == 0 {
return nil, fmt.Errorf("No values were returned by the function passed to Gomega"), stopTrying
}
actual := values[0].Interface()
if stopTryingErr, ok := asStopTryingError(actual); ok{
stopTrying = stopTryingErr
}
for i, extraValue := range values[1:] {
extra := extraValue.Interface()
if extra == nil {
continue
}
if stopTryingErr, ok := asStopTryingError(extra); ok{
stopTrying = stopTryingErr
continue
}
zero := reflect.Zero(reflect.TypeOf(extra)).Interface()
if reflect.DeepEqual(extra, zero) {
continue
}
if err == nil {
err = fmt.Errorf("Unexpected non-nil/non-zero argument at index %d:\n\t<%T>: %#v", i+1, extra, extra)
}
}
return actual, err, stopTrying
}
var gomegaType = reflect.TypeOf((*types.Gomega)(nil)).Elem()
var contextType = reflect.TypeOf(new(context.Context)).Elem()
func (assertion *AsyncAssertion) invalidFunctionError(t reflect.Type) error {
return fmt.Errorf(`The function passed to %s had an invalid signature of %s. Functions passed to %s must either:
(a) have return values or
(b) take a Gomega interface as their first argument and use that Gomega instance to make assertions.
You can learn more at https://onsi.github.io/gomega/#eventually
`, assertion.asyncType, t, assertion.asyncType)
}
func (assertion *AsyncAssertion) noConfiguredContextForFunctionError() error {
return fmt.Errorf(`The function passed to %s requested a context.Context, but no context has been provided. Please pass one in using %s().WithContext().
You can learn more at https://onsi.github.io/gomega/#eventually
`, assertion.asyncType, assertion.asyncType)
}
func (assertion *AsyncAssertion) argumentMismatchError(t reflect.Type, numProvided int) error {
have := "have"
if numProvided == 1 {
have = "has"
}
return fmt.Errorf(`The function passed to %s has signature %s takes %d arguments but %d %s been provided. Please use %s().WithArguments() to pass the corect set of arguments.
You can learn more at https://onsi.github.io/gomega/#eventually
`, assertion.asyncType, t, t.NumIn(), numProvided, have, assertion.asyncType)
}
func (assertion *AsyncAssertion) buildActualPoller() (func() (interface{}, error, StopTryingError), error) {
if !assertion.actualIsFunc {
return func() (interface{}, error, StopTryingError) { return assertion.actual, nil, nil }, nil
}
actualValue := reflect.ValueOf(assertion.actual)
actualType := reflect.TypeOf(assertion.actual)
numIn, numOut, isVariadic := actualType.NumIn(), actualType.NumOut(), actualType.IsVariadic()
if numIn == 0 && numOut == 0 {
return nil, assertion.invalidFunctionError(actualType)
} else if numIn == 0 {
return func() (actual interface{}, err error, stopTrying StopTryingError) {
defer func() {
if e := recover(); e != nil {
if stopTryingErr, ok := asStopTryingError(e); ok {
stopTrying = stopTryingErr
} else {
panic(e)
}
}
}()
actual, err, stopTrying = assertion.processReturnValues(actualValue.Call([]reflect.Value{}))
return
}, nil
}
takesGomega, takesContext := actualType.In(0).Implements(gomegaType), actualType.In(0).Implements(contextType)
if takesGomega && numIn > 1 && actualType.In(1).Implements(contextType) {
takesContext = true
}
if takesContext && len(assertion.argsToForward) > 0 && reflect.TypeOf(assertion.argsToForward[0]).Implements(contextType) {
takesContext = false
}
if !takesGomega && numOut == 0 {
return nil, assertion.invalidFunctionError(actualType)
}
if takesContext && assertion.ctx == nil {
return nil, assertion.noConfiguredContextForFunctionError()
}
var assertionFailure error
inValues := []reflect.Value{}
if takesGomega {
inValues = append(inValues, reflect.ValueOf(NewGomega(assertion.g.DurationBundle).ConfigureWithFailHandler(func(message string, callerSkip ...int) {
skip := 0
if len(callerSkip) > 0 {
skip = callerSkip[0]
}
_, file, line, _ := runtime.Caller(skip + 1)
assertionFailure = fmt.Errorf("Assertion in callback at %s:%d failed:\n%s", file, line, message)
panic("stop execution")
})))
}
if takesContext {
inValues = append(inValues, reflect.ValueOf(assertion.ctx))
}
for _, arg := range assertion.argsToForward {
inValues = append(inValues, reflect.ValueOf(arg))
}
if !isVariadic && numIn != len(inValues) {
return nil, assertion.argumentMismatchError(actualType, len(inValues))
} else if isVariadic && len(inValues) < numIn-1 {
return nil, assertion.argumentMismatchError(actualType, len(inValues))
}
return func() (actual interface{}, err error, stopTrying StopTryingError) {
var values []reflect.Value
assertionFailure = nil
defer func() {
if numOut == 0 {
actual = assertionFailure
} else {
actual, err, stopTrying = assertion.processReturnValues(values)
if assertionFailure != nil {
err = assertionFailure
}
}
if e := recover(); e != nil {
if stopTryingErr, ok := asStopTryingError(e); ok {
stopTrying = stopTryingErr
} else if assertionFailure == nil {
panic(e)
}
}
}()
values = actualValue.Call(inValues)
return
}, nil
}
func (assertion *AsyncAssertion) matcherSaysStopTrying(matcher types.GomegaMatcher, value interface{}) StopTryingError {
if assertion.actualIsFunc || types.MatchMayChangeInTheFuture(matcher, value) {
return nil
}
return StopTrying("No future change is possible. Bailing out early")
}
type contextWithAttachProgressReporter interface {
AttachProgressReporter(func() string) func()
}
func (assertion *AsyncAssertion) match(matcher types.GomegaMatcher, desiredMatch bool, optionalDescription ...interface{}) bool {
timer := time.Now()
timeout := time.After(assertion.timeoutInterval)
lock := sync.Mutex{}
var matches bool
var err error
assertion.g.THelper()
pollActual, err := assertion.buildActualPoller()
if err != nil {
assertion.g.Fail(err.Error(), 2+assertion.offset)
return false
}
value, err, stopTrying := pollActual()
if err == nil {
if stopTrying == nil {
stopTrying = assertion.matcherSaysStopTrying(matcher, value)
}
matches, err = matcher.Match(value)
}
messageGenerator := func() string {
// can be called out of band by Ginkgo if the user requests a progress report
lock.Lock()
defer lock.Unlock()
errMsg := ""
message := ""
if err != nil {
errMsg = "Error: " + err.Error()
} else {
if desiredMatch {
message = matcher.FailureMessage(value)
} else {
message = matcher.NegatedFailureMessage(value)
}
}
description := assertion.buildDescription(optionalDescription...)
return fmt.Sprintf("%s%s%s", description, message, errMsg)
}
fail := func(preamble string) {
assertion.g.THelper()
assertion.g.Fail(fmt.Sprintf("%s after %.3fs.\n%s", preamble, time.Since(timer).Seconds(), messageGenerator()), 3+assertion.offset)
}
var contextDone <-chan struct{}
if assertion.ctx != nil {
contextDone = assertion.ctx.Done()
if v, ok := assertion.ctx.Value("GINKGO_SPEC_CONTEXT").(contextWithAttachProgressReporter); ok {
detach := v.AttachProgressReporter(messageGenerator)
defer detach()
}
}
if assertion.asyncType == AsyncAssertionTypeEventually {
for {
if err == nil && matches == desiredMatch {
return true
}
if stopTrying != nil {
fail(stopTrying.Error() + " -")
return false
}
select {
case <-time.After(assertion.pollingInterval):
v, e, st := pollActual()
if st != nil && st.wasViaPanic() {
// we were told to stop trying via panic - which means we dont' have reasonable new values
// we should simply use the old values and exit now
fail(st.Error() + " -")
return false
}
lock.Lock()
value, err, stopTrying = v, e, st
lock.Unlock()
if err == nil {
if stopTrying == nil {
stopTrying = assertion.matcherSaysStopTrying(matcher, value)
}
matches, e = matcher.Match(value)
lock.Lock()
err = e
lock.Unlock()
}
case <-contextDone:
fail("Context was cancelled")
return false
case <-timeout:
fail("Timed out")
return false
}
}
} else if assertion.asyncType == AsyncAssertionTypeConsistently {
for {
if !(err == nil && matches == desiredMatch) {
fail("Failed")
return false
}
if stopTrying != nil {
return true
}
select {
case <-time.After(assertion.pollingInterval):
v, e, st := pollActual()
if st != nil && st.wasViaPanic() {
// we were told to stop trying via panic - which means we made it this far and should return successfully
return true
}
lock.Lock()
value, err, stopTrying = v, e, st
lock.Unlock()
if err == nil {
if stopTrying == nil {
stopTrying = assertion.matcherSaysStopTrying(matcher, value)
}
matches, e = matcher.Match(value)
lock.Lock()
err = e
lock.Unlock()
}
case <-contextDone:
fail("Context was cancelled")
return false
case <-timeout:
return true
}
}
}
return false
}