89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
package state
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import (
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"fmt"
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"github.com/roboll/helmfile/helmexec"
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"sync"
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)
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type result struct {
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release ReleaseSpec
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err error
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}
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func (st *HelmState) scatterGather(concurrency int, items int, produceInputs func(), receiveInputsAndProduceIntermediates func(int), aggregateIntermediates func()) {
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numReleases := len(st.Releases)
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if concurrency < 1 {
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concurrency = numReleases
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} else if concurrency > numReleases {
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concurrency = numReleases
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}
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// WaitGroup is required to wait until goroutine per job in job queue cleanly stops.
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var waitGroup sync.WaitGroup
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waitGroup.Add(concurrency)
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go produceInputs()
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for w := 1; w <= concurrency; w++ {
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go func(id int) {
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st.logger.Debugf("worker %d/%d started", id, concurrency)
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receiveInputsAndProduceIntermediates(id)
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st.logger.Debugf("worker %d/%d finished", id, concurrency)
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waitGroup.Done()
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}(w)
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}
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aggregateIntermediates()
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// Wait until all the goroutines to gracefully finish
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waitGroup.Wait()
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}
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func (st *HelmState) scatterGatherReleases(helm helmexec.Interface, concurrency int, do func(ReleaseSpec) error) []error {
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var errs []error
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inputs := st.Releases
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inputsSize := len(inputs)
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releases := make(chan ReleaseSpec)
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results := make(chan result)
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st.scatterGather(
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concurrency,
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inputsSize,
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func() {
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for _, release := range inputs {
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releases <- release
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}
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close(releases)
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},
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func(id int) {
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for release := range releases {
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err := do(release)
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st.logger.Debugf("sending result for release: %s\n", release.Name)
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results <- result{release: release, err: err}
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st.logger.Debugf("sent result for release: %s\n", release.Name)
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}
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},
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func() {
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for i := range inputs {
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st.logger.Debugf("receiving result %d", i)
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r := <-results
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if r.err != nil {
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errs = append(errs, fmt.Errorf("release \"%s\" failed: %v", r.release.Name, r.err))
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} else {
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st.logger.Debugf("received result for release \"%s\"", r.release.Name)
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}
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st.logger.Debugf("received result for %d", i)
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}
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},
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)
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if len(errs) != 0 {
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return errs
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}
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return nil
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}
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