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queue: Add a mutex to protect item's results

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The item results get accessed in various places concurrently, so this patch
adds a mutex to protect it.
This commit is contained in:
Alberto Bertogli
2016-07-19 23:02:42 +01:00
parent 21e69aa42f
commit 831ef13132
1 changed files with 12 additions and 2 deletions
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14
internal/queue/queue.go
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@@ -134,6 +134,14 @@ type Item struct {
// Map of recipient -> last result of sending it.
Results map[string]error
mu sync.Mutex
}
func (item *Item) resultsFor(to string) (error, bool) {
item.mu.Lock()
defer item.mu.Unlock()
value, ok := item.Results[to]
return value, ok
}
func (item *Item) SendLoop(q *Queue) {
@@ -149,7 +157,7 @@ func (item *Item) SendLoop(q *Queue) {
// Send to all recipients that are still pending.
var wg sync.WaitGroup
for _, to := range item.To {
if err, ok := item.Results[to]; ok && err == nil {
if err, ok := item.resultsFor(to); ok && err == nil {
// Successful send for this recipient, nothing to do.
continue
}
@@ -160,7 +168,9 @@ func (item *Item) SendLoop(q *Queue) {
tr.LazyPrintf("%s sending", to)
err = q.courier.Deliver(item.From, to, item.Data)
item.mu.Lock()
item.Results[to] = err
item.mu.Unlock()
if err != nil {
tr.LazyPrintf("error: %v", err)
@@ -175,7 +185,7 @@ func (item *Item) SendLoop(q *Queue) {
successful := 0
for _, to := range item.To {
if err, ok := item.Results[to]; ok && err == nil {
if err, ok := item.resultsFor(to); ok && err == nil {
successful++
}
}