X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/53f785c298338645b6880f22f26b0c36a7cfab4d..2255281ed7406e7c10027ed778f53ee28e6869fa:/services/datamanager/summary/file.go

diff --git a/services/datamanager/summary/file.go b/services/datamanager/summary/file.go
index ce7d687412..18b3aec819 100644
--- a/services/datamanager/summary/file.go
+++ b/services/datamanager/summary/file.go
@@ -26,6 +26,11 @@ var (
 	readDataFrom string
 )
 
+// DataFetcher to fetch data from keep servers
+type DataFetcher func(arvLogger *logger.Logger,
+	readCollections *collection.ReadCollections,
+	keepServerInfo *keep.ReadServers)
+
 func init() {
 	flag.StringVar(&writeDataTo,
 		"write-data-to",
@@ -37,7 +42,7 @@ func init() {
 		"Avoid network i/o and read summary data from this file instead. Used for development only.")
 }
 
-// Writes data we've read to a file.
+// MaybeWriteData writes data we've read to a file.
 //
 // This is useful for development, so that we don't need to read all
 // our data from the network every time we tweak something.
@@ -49,40 +54,45 @@ func MaybeWriteData(arvLogger *logger.Logger,
 	keepServerInfo keep.ReadServers) bool {
 	if writeDataTo == "" {
 		return false
-	} else {
-		summaryFile, err := os.Create(writeDataTo)
-		if err != nil {
-			loggerutil.FatalWithMessage(arvLogger,
-				fmt.Sprintf("Failed to open %s: %v", writeDataTo, err))
-		}
-		defer summaryFile.Close()
+	}
+	summaryFile, err := os.Create(writeDataTo)
+	if err != nil {
+		loggerutil.FatalWithMessage(arvLogger,
+			fmt.Sprintf("Failed to open %s: %v", writeDataTo, err))
+	}
+	defer summaryFile.Close()
 
-		enc := gob.NewEncoder(summaryFile)
-		data := serializedData{
-			ReadCollections: readCollections,
-			KeepServerInfo:  keepServerInfo}
-		err = enc.Encode(data)
-		if err != nil {
-			loggerutil.FatalWithMessage(arvLogger,
-				fmt.Sprintf("Failed to write summary data: %v", err))
-		}
-		log.Printf("Wrote summary data to: %s", writeDataTo)
-		return true
+	enc := gob.NewEncoder(summaryFile)
+	data := serializedData{
+		ReadCollections: readCollections,
+		KeepServerInfo:  keepServerInfo}
+	err = enc.Encode(data)
+	if err != nil {
+		loggerutil.FatalWithMessage(arvLogger,
+			fmt.Sprintf("Failed to write summary data: %v", err))
 	}
+	log.Printf("Wrote summary data to: %s", writeDataTo)
+	return true
 }
 
-// Reads data that we've written to a file.
+// ShouldReadData should not be used outside of development
+func ShouldReadData() bool {
+	return readDataFrom != ""
+}
+
+// ReadData reads data that we've written to a file.
 //
 // This is useful for development, so that we don't need to read all
 // our data from the network every time we tweak something.
 //
 // This should not be used outside of development, since you'll be
 // working with stale data.
-func MaybeReadData(arvLogger *logger.Logger,
+func ReadData(arvLogger *logger.Logger,
 	readCollections *collection.ReadCollections,
-	keepServerInfo *keep.ReadServers) bool {
+	keepServerInfo *keep.ReadServers) {
 	if readDataFrom == "" {
-		return false
+		loggerutil.FatalWithMessage(arvLogger,
+			"ReadData() called with empty filename.")
 	} else {
 		summaryFile, err := os.Open(readDataFrom)
 		if err != nil {
@@ -107,6 +117,5 @@ func MaybeReadData(arvLogger *logger.Logger,
 		*readCollections = data.ReadCollections
 		*keepServerInfo = data.KeepServerInfo
 		log.Printf("Read summary data from: %s", readDataFrom)
-		return true
 	}
 }