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pipe_test.go
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pipe_test.go
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package workflow
import (
"context"
"errors"
"testing"
)
func TestPipeExecuteBehaviourOnPreservingErrorsType(t *testing.T) {
anyErr := errors.New("any-error")
input := []PipeStepConfig[any]{
{Step: newPipeStepSuccessful[any]("cmd1")},
{Step: newPipeStepFailedNonRetryable[any]("cmd2", anyErr)},
}
c := NewPipe("some-workflow", input, nil)
_, actualOutputErr := c.Execute(context.TODO(), nil)
expectedOutputErr := anyErr
if !errors.Is(actualOutputErr, expectedOutputErr) {
t.Errorf("The workflow error does not wrap the inner errors: \n expected = %#v, \n actual = %#v", expectedOutputErr, actualOutputErr)
}
}
func TestPipeExecuteBehaviourOnReturningErrors(t *testing.T) {
anyErr := errors.New("any-err")
tests := []struct {
name string
input []PipeStepConfig[any]
expectedOutput error
}{
{
name: "an workflow with an empty step collection should return a nil error",
input: nil,
expectedOutput: nil,
},
{
name: "a workflow with steps returning errors, but configured not to stop on them, should return an error",
input: []PipeStepConfig[any]{
{Step: newPipeStepFailedRetryable[any]("step 1", anyErr)},
{Step: newPipeStepSuccessful[any]("step 2")},
},
expectedOutput: anyErr,
},
{
name: "a workflow with steps returning errors, but configured to retry, should not return an error if it succeeds on retry",
input: []PipeStepConfig[any]{
{Step: newPipeStepFailedRetryableRecoverable[any]("step 1", anyErr, 2), RetryConfigProvider: defaultRetryConfigProviderTest},
{Step: newPipeStepFailedRetryableRecoverable[any]("step 2", anyErr, 3), RetryConfigProvider: defaultRetryConfigProviderTest},
{Step: newPipeStepSuccessful[any]("step 3")},
},
expectedOutput: nil,
},
{
name: "a workflow with steps returning errors, but configured to retry, should return an error if it not succeed on retry",
input: []PipeStepConfig[any]{
{Step: newPipeStepFailedRetryable[any]("step 1", anyErr), RetryConfigProvider: defaultRetryConfigProviderTest},
{Step: newPipeStepSuccessful[any]("step 2"), RetryConfigProvider: defaultRetryConfigProviderTest},
},
expectedOutput: anyErr,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
c := NewPipe("some-workflow", tt.input, nil)
_, actualOutput := c.Execute(context.TODO(), nil)
if !errors.Is(actualOutput, tt.expectedOutput) {
t.Errorf("The workflow returned error behaviour not as expected: \n expected = %#v \n actual = %#v",
tt.expectedOutput,
actualOutput,
)
}
})
}
}
func TestPipeExecuteBehaviourOnRetry(t *testing.T) {
anyErr := errors.New("any-err")
tests := []struct {
name string
input []PipeStepConfig[any]
expectedOutput int
}{
{
name: "a workflow with steps returning errors, but configured to retry, should stop retrying if the step returns false on retry",
input: []PipeStepConfig[any]{
{Step: newPipeStepFailedNonRetryableFromInvocationCount[any]("step 1", anyErr, 1), RetryConfigProvider: defaultRetryConfigProviderTest},
},
expectedOutput: 1,
},
{
name: "a workflow with steps returning errors, but configured to retry, should not stop retrying if the step don't change its retry flag",
input: []PipeStepConfig[any]{
{Step: newPipeStepFailedRetryable[any]("step 1", anyErr), RetryConfigProvider: defaultRetryConfigProviderTest},
},
expectedOutput: 3,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
c := NewPipe("some-workflow", tt.input, nil)
c.Execute(context.TODO(), nil)
actualOutput := c.stepsConfig[0].Step.(*pipeStepMock[any]).invocationCount
if tt.expectedOutput != actualOutput {
t.Errorf("The workflow behaviour on retry, not as expected: \n actual = %#v, \n expected = %#v",
actualOutput,
tt.expectedOutput,
)
}
})
}
}
func TestPipeExecuteBehaviourOnStoppingWorkflow(t *testing.T) {
anyErr := errors.New("any-err")
testResultMap := map[bool]string{
false: "stopped",
true: "not stopped",
}
type behaviour struct {
lastCmdWasInvoked bool
}
tests := []struct {
name string
input []PipeStepConfig[any]
expectedOutput behaviour
}{
{
name: "a workflow with steps returning errors, should stop at the first step error",
input: []PipeStepConfig[any]{
{Step: newPipeStepFailedNonRetryable[any]("step 1", anyErr)},
{Step: newPipeStepFailedNonRetryable[any]("step 2", anyErr)},
{Step: newPipeStepSuccessful[any]("step 3")},
},
expectedOutput: behaviour{lastCmdWasInvoked: false},
},
{
name: "a workflow with no failing steps, should run all of them",
input: []PipeStepConfig[any]{
{Step: newPipeStepSuccessful[any]("step 1")},
{Step: newPipeStepSuccessful[any]("step 2")},
{Step: newPipeStepSuccessful[any]("step 3")},
},
expectedOutput: behaviour{lastCmdWasInvoked: true},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
c := NewPipe("some-workflow", tt.input, nil)
c.Execute(context.TODO(), nil)
actualOutput := tt.input[len(tt.input)-1].Step.(*pipeStepMock[any]).invocationCount > 0
expectedOutput := tt.expectedOutput.lastCmdWasInvoked
if actualOutput != expectedOutput {
t.Errorf("The workflow did not behave as expected \n actual result = %#v, \n expected result: %#v \n",
testResultMap[actualOutput],
testResultMap[expectedOutput],
)
}
})
}
}
// BENCHMARKS
// BenchmarkPipeExecuteHappyFlow performs a benchmark for the scenario in which there is no error in the workflow.
// This should produce 0 allocations.
func BenchmarkPipeExecuteHappyFlow(b *testing.B) {
stepsCfgW2 := []PipeStepConfig[any]{
{Step: newPipeStepSuccessful[any]("log-request-data")},
{Step: newPipeStepSuccessful[any]("notify-monitoring-system")},
}
w2 := NewPipe("monitoring-workflow", stepsCfgW2, nil)
stepsCfg := []PipeStepConfig[any]{
{Step: newPipeStepSuccessful[any]("extract-data-from-data-provider")},
{Step: newPipeStepSuccessful[any]("transform-data-extracted-from-data-provider")},
{Step: newPipeStepSuccessful[any]("load-the-data-into-the-data-source")},
{Step: w2},
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
s := NewPipe("just-execute-these-steps-workflow", stepsCfg, nil)
s.Execute(context.TODO(), nil)
}
}
// BenchmarkPipeExecuteErrFlowOneErr performs a benchmark for the scenario in which there are errors in the workflow.
// This should produce 3 allocations, corresponding to the error usage (allocation for the error slice and errors.Join)
func BenchmarkPipeExecuteErrFlowErr(b *testing.B) {
stepsCfgW2 := []PipeStepConfig[any]{
{Step: newPipeStepSuccessful[any]("log-request-data")},
{Step: newPipeStepSuccessful[any]("notify-monitoring-system")},
}
w2 := NewPipe("monitoring-workflow", stepsCfgW2, nil)
stepsCfg := []PipeStepConfig[any]{
{Step: newPipeStepSuccessful[any]("extract-data-from-data-provider")},
{
Step: newPipeStepFailedRetryable[any]("transform-data-extracted-from-data-provider", errors.New("some err")),
RetryConfigProvider: defaultRetryConfigProviderTest,
},
{Step: newPipeStepSuccessful[any]("load-the-data-into-the-data-source")},
{Step: w2},
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
s := NewPipe("just-execute-these-steps-workflow", stepsCfg, nil)
s.Execute(context.TODO(), nil)
}
}
// MOCKS/STUBS
type pipeStepMock[T any] struct {
invocationCount int
succeedAtInvocationCount int
name string
execute executeOutput[T]
canRetry bool
canRetryReturnFalseAtInvocationCount int
}
type executeOutput[T any] struct {
val T
error error
}
func (c *pipeStepMock[T]) Name() string {
return c.name
}
func (c *pipeStepMock[T]) Execute(ctx context.Context, request T) (T, error) {
c.invocationCount++
if c.succeedAtInvocationCount == c.invocationCount {
return c.execute.val, nil
}
return c.execute.val, c.execute.error
}
func (c *pipeStepMock[T]) CanRetry() bool {
if c.canRetryReturnFalseAtInvocationCount == c.invocationCount {
return false
}
return c.canRetry
}
func newPipeStepSuccessful[T any](name string) *pipeStepMock[T] {
return &pipeStepMock[T]{name: name}
}
func newPipeStepFailedRetryable[T any](name string, failWith error) *pipeStepMock[T] {
return &pipeStepMock[T]{name: name, execute: executeOutput[T]{error: failWith}, canRetry: true}
}
func newPipeStepFailedNonRetryableFromInvocationCount[T any](name string, failWith error, nonRetryableFromInvocationCount int) *pipeStepMock[T] {
return &pipeStepMock[T]{name: name, execute: executeOutput[T]{error: failWith}, canRetry: true, canRetryReturnFalseAtInvocationCount: nonRetryableFromInvocationCount}
}
func newPipeStepFailedRetryableRecoverable[T any](name string, failWith error, succeedsAtInvocationCount int) *pipeStepMock[T] {
return &pipeStepMock[T]{name: name, execute: executeOutput[T]{error: failWith}, canRetry: true, succeedAtInvocationCount: succeedsAtInvocationCount}
}
func newPipeStepFailedNonRetryable[T any](name string, failWith error) *pipeStepMock[T] {
return &pipeStepMock[T]{name: name, execute: executeOutput[T]{error: failWith}, canRetry: false}
}