100 lines
2 KiB
Go
100 lines
2 KiB
Go
package common
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import (
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"fmt"
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log "github.com/sirupsen/logrus"
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)
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// Warning that implements `error` but safe to ignore
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type Warning struct {
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Message string
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}
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// Error the contract for error
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func (w Warning) Error() string {
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return w.Message
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}
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// Warningf create a warning
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func Warningf(format string, args ...interface{}) Warning {
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w := Warning{
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Message: fmt.Sprintf(format, args...),
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}
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return w
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}
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// Executor define contract for the steps of a workflow
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type Executor func() error
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// Conditional define contract for the conditional predicate
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type Conditional func() bool
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// NewPipelineExecutor creates a new executor from a series of other executors
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func NewPipelineExecutor(executors ...Executor) Executor {
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return func() error {
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for _, executor := range executors {
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if executor == nil {
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continue
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}
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err := executor()
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if err != nil {
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switch err.(type) {
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case Warning:
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log.Warning(err.Error())
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return nil
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default:
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log.Debugf("%+v", err)
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return err
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}
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}
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}
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return nil
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}
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}
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// NewConditionalExecutor creates a new executor based on conditions
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func NewConditionalExecutor(conditional Conditional, trueExecutor Executor, falseExecutor Executor) Executor {
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return func() error {
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if conditional() {
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if trueExecutor != nil {
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return trueExecutor()
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}
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} else {
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if falseExecutor != nil {
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return falseExecutor()
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}
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}
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return nil
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}
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}
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func executeWithChan(executor Executor, errChan chan error) {
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errChan <- executor()
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}
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// NewErrorExecutor creates a new executor that always errors out
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func NewErrorExecutor(err error) Executor {
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return func() error {
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return err
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}
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}
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// NewParallelExecutor creates a new executor from a parallel of other executors
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func NewParallelExecutor(executors ...Executor) Executor {
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return func() error {
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errChan := make(chan error)
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for _, executor := range executors {
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go executeWithChan(executor, errChan)
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}
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for i := 0; i < len(executors); i++ {
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err := <-errChan
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if err != nil {
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return err
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}
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}
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return nil
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}
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}
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