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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package bucketize
import (
"context"
"fmt"
"strings"
"sync"
"src/tools/ak/res/res"
)
type contextKey int
const (
ctxErr contextKey = 0
)
// errorf returns a formatted error with any context sensitive information prefixed to the error
func errorf(ctx context.Context, fmts string, a ...interface{}) error {
if s, ok := ctx.Value(ctxErr).(string); ok {
return fmt.Errorf(strings.Join([]string{s, fmts}, ""), a...)
}
return fmt.Errorf(fmts, a...)
}
// prefixErr returns a context which adds a prefix to error messages.
func prefixErr(ctx context.Context, add string) context.Context {
if s, ok := ctx.Value(ctxErr).(string); ok {
return context.WithValue(ctx, ctxErr, strings.Join([]string{s, add}, ""))
}
return context.WithValue(ctx, ctxErr, add)
}
func separatePathInfosByValues(ctx context.Context, pis []*res.PathInfo) (<-chan *res.PathInfo, <-chan *res.PathInfo) {
valuesPIC := make(chan *res.PathInfo)
nonValuesPIC := make(chan *res.PathInfo)
go func() {
defer close(valuesPIC)
defer close(nonValuesPIC)
for _, pi := range pis {
if pi.Type.Kind() == res.Value || pi.Type.Kind() == res.Both && strings.HasPrefix(pi.TypeDir, "values") {
select {
case valuesPIC <- pi:
case <-ctx.Done():
return
}
} else {
select {
case nonValuesPIC <- pi:
case <-ctx.Done():
return
}
}
}
}()
return valuesPIC, nonValuesPIC
}
func mergeValuesResourceStreams(ctx context.Context, vrCs []<-chan *res.ValuesResource) <-chan *res.ValuesResource {
vrC := make(chan *res.ValuesResource)
var wg sync.WaitGroup
wg.Add(len(vrCs))
output := func(c <-chan *res.ValuesResource) {
defer wg.Done()
for vr := range c {
select {
case vrC <- vr:
case <-ctx.Done():
return
}
}
}
for _, c := range vrCs {
go output(c)
}
go func() {
wg.Wait()
close(vrC)
}()
return vrC
}
func mergeResourcesAttributeStreams(ctx context.Context, raCs []<-chan *ResourcesAttribute) <-chan *ResourcesAttribute {
raC := make(chan *ResourcesAttribute)
var wg sync.WaitGroup
wg.Add(len(raCs))
output := func(c <-chan *ResourcesAttribute) {
defer wg.Done()
for ra := range c {
select {
case raC <- ra:
case <-ctx.Done():
return
}
}
}
for _, c := range raCs {
go output(c)
}
go func() {
wg.Wait()
close(raC)
}()
return raC
}
// mergeErrStreams fans in multiple error streams into a single stream.
func mergeErrStreams(ctx context.Context, errCs []<-chan error) <-chan error {
errC := make(chan error)
var wg sync.WaitGroup
wg.Add(len(errCs))
output := func(c <-chan error) {
defer wg.Done()
for e := range c {
select {
case errC <- e:
case <-ctx.Done():
return
}
}
}
for _, rc := range errCs {
go output(rc)
}
go func() {
wg.Wait()
close(errC)
}()
return errC
}
// sendErr attempts to send the provided error to the provided chan, however is the context is canceled, it will return false.
func sendErr(ctx context.Context, errC chan<- error, err error) bool {
select {
case <-ctx.Done():
return false
case errC <- err:
return true
}
}
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