X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/d005c38bea17107e7be3c5338ad31ba54085df61..908261de15c98553a4200f01aff1f26ef57c8fb8:/services/datamanager/datamanager.go

diff --git a/services/datamanager/datamanager.go b/services/datamanager/datamanager.go
index ba7446e754..604a6db2f4 100644
--- a/services/datamanager/datamanager.go
+++ b/services/datamanager/datamanager.go
@@ -108,10 +108,9 @@ func singlerun(arv arvadosclient.ArvadosClient) error {
 		dataFetcher = BuildDataFetcher(arv)
 	}
 
-	dataFetcher(arvLogger, &readCollections, &keepServerInfo)
-
-	if readCollections.Err != nil {
-		return readCollections.Err
+	err = dataFetcher(arvLogger, &readCollections, &keepServerInfo)
+	if err != nil {
+		return err
 	}
 
 	err = summary.MaybeWriteData(arvLogger, readCollections, keepServerInfo)
@@ -138,6 +137,11 @@ func singlerun(arv arvadosclient.ArvadosClient) error {
 			rlbss.Count)
 	}
 
+	kc, err := keepclient.MakeKeepClient(&arv)
+	if err != nil {
+		return fmt.Errorf("Error setting up keep client %v", err.Error())
+	}
+
 	// Log that we're finished. We force the recording, since go will
 	// not wait for the write timer before exiting.
 	if arvLogger != nil {
@@ -151,12 +155,6 @@ func singlerun(arv arvadosclient.ArvadosClient) error {
 		})
 	}
 
-	// Not dry-run; issue changes to keepstore
-	kc, err := keepclient.MakeKeepClient(&arv)
-	if err != nil {
-		return fmt.Errorf("Error setting up keep client %v", err.Error())
-	}
-
 	pullServers := summary.ComputePullServers(kc,
 		&keepServerInfo,
 		readCollections.BlockToDesiredReplication,
@@ -183,30 +181,35 @@ func singlerun(arv arvadosclient.ArvadosClient) error {
 
 // BuildDataFetcher returns a data fetcher that fetches data from remote servers.
 func BuildDataFetcher(arv arvadosclient.ArvadosClient) summary.DataFetcher {
-	return func(arvLogger *logger.Logger,
+	return func(
+		arvLogger *logger.Logger,
 		readCollections *collection.ReadCollections,
-		keepServerInfo *keep.ReadServers) {
-		collectionChannel := make(chan collection.ReadCollections)
-
+		keepServerInfo *keep.ReadServers,
+	) error {
+		collDone := make(chan struct{})
+		var collErr error
 		go func() {
-			collectionChannel <- collection.GetCollectionsAndSummarize(
+			*readCollections, collErr = collection.GetCollectionsAndSummarize(
 				collection.GetCollectionsParams{
 					Client:    arv,
 					Logger:    arvLogger,
 					BatchSize: 50})
+			collDone <- struct{}{}
 		}()
 
-		var err error
-		*keepServerInfo, err = keep.GetKeepServersAndSummarize(
+		var keepErr error
+		*keepServerInfo, keepErr = keep.GetKeepServersAndSummarize(
 			keep.GetKeepServersParams{
 				Client: arv,
 				Logger: arvLogger,
 				Limit:  1000})
 
-		if err != nil {
-			return
-		}
+		<- collDone
 
-		*readCollections = <-collectionChannel
+		// Return a nil error only if both parts succeeded.
+		if collErr != nil {
+			return collErr
+		}
+		return keepErr
 	}
 }