func combineProfiles(profiles []*profile.Profile, msrcs []plugin.MappingSources) (*profile.Profile, plugin.MappingSources, error) {
// Merge profiles.
if err := measurement.ScaleProfiles(profiles); err != nil {
return nil, nil, err
}
p, err := profile.Merge(profiles)
if err != nil {
return nil, nil, err
}
// Combine mapping sources.
msrc := make(plugin.MappingSources)
for _, ms := range msrcs {
for m, s := range ms {
msrc[m] = append(msrc[m], s...)
}
}
return p, msrc, nil
}
// concurrentGrab fetches multiple profiles concurrently
func concurrentGrab(s *source, fetch plugin.Fetcher, obj plugin.ObjTool, ui plugin.UI) (*profile.Profile, plugin.MappingSources, bool, error) {
wg := sync.WaitGroup{}
numprofs := len(s.Sources) + len(s.Base)
profs := make([]*profile.Profile, numprofs)
msrcs := make([]plugin.MappingSources, numprofs)
remote := make([]bool, numprofs)
errs := make([]error, numprofs)
for i, source := range s.Sources {
wg.Add(1)
go func(i int, src string) {
defer wg.Done()
profs[i], msrcs[i], remote[i], errs[i] = grabProfile(s, src, 1, fetch, obj, ui)
}(i, source)
}
for i, source := range s.Base {
wg.Add(1)
go func(i int, src string) {
defer wg.Done()
profs[i], msrcs[i], remote[i], errs[i] = grabProfile(s, src, -1, fetch, obj, ui)
}(i+len(s.Sources), source)
}
wg.Wait()
var save bool
var numFailed = 0
for i, src := range s.Sources {
if errs[i] != nil {
ui.PrintErr(src + ": " + errs[i].Error())
numFailed++
}
save = save || remote[i]
}
for i, src := range s.Base {
b := i + len(s.Sources)
if errs[b] != nil {
ui.PrintErr(src + ": " + errs[b].Error())
numFailed++
}
save = save || remote[b]
}
if numFailed == numprofs {
return nil, nil, false, fmt.Errorf("failed to fetch any profiles")
}
if numFailed > 0 {
ui.PrintErr(fmt.Sprintf("fetched %d profiles out of %d", numprofs-numFailed, numprofs))
}
scaled := make([]*profile.Profile, 0, numprofs)
for _, p := range profs {
if p != nil {
scaled = append(scaled, p)
}
}
// Merge profiles.
if err := measurement.ScaleProfiles(scaled); err != nil {
return nil, nil, false, err
}
p, err := profile.Merge(scaled)
if err != nil {
return nil, nil, false, err
}
// Combine mapping sources.
msrc := make(plugin.MappingSources)
for _, ms := range msrcs {
for m, s := range ms {
msrc[m] = append(msrc[m], s...)
}
}
return p, msrc, save, nil
}