broker: append message logs

1 files changed, 116 insertions, 0 deletions

diff --git a/weed/messaging/broker_append.go b/weed/messaging/broker_append.go
new file mode 100644
index 000000000..07b3755c0
--- /dev/null
+++ b/weed/messaging/broker_append.go
@@ -0,0 +1,116 @@
+package messaging
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func (broker *MessageBroker) appendToFile(targetFile string, topicConfig *messaging_pb.TopicConfiguration, data []byte) error {
+
+	assignResult, uploadResult, err2 := broker.assignAndUpload(topicConfig, data)
+	if err2 != nil {
+		return err2
+	}
+
+	dir, name := util.FullPath(targetFile).DirAndName()
+
+	chunk := &filer_pb.FileChunk{
+		FileId:    assignResult.Fid,
+		Offset:    0, // needs to be fixed during appending
+		Size:      uint64(uploadResult.Size),
+		Mtime:     time.Now().UnixNano(),
+		ETag:      uploadResult.ETag,
+		IsGzipped: uploadResult.Gzip > 0,
+	}
+
+	// append the chunk
+	if err := broker.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		request := &filer_pb.AppendToEntryRequest{
+			Directory: dir,
+			EntryName: name,
+			Chunks:    []*filer_pb.FileChunk{chunk},
+		}
+
+		_, err := client.AppendToEntry(context.Background(), request)
+		if err != nil {
+			glog.V(0).Infof("append to file %v: %v", request, err)
+			return err
+		}
+
+		return nil
+	}); err != nil {
+		return fmt.Errorf("append to file %v: %v", targetFile, err)
+	}
+
+	return nil
+}
+
+func (broker *MessageBroker) assignAndUpload(topicConfig *messaging_pb.TopicConfiguration, data []byte) (*operation.AssignResult, *operation.UploadResult, error) {
+
+	var assignResult = &operation.AssignResult{}
+	var collection, replication string
+
+	// assign a volume location
+	if err := broker.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		request := &filer_pb.AssignVolumeRequest{
+			Count:       1,
+			Replication: topicConfig.Replication,
+			Collection:  topicConfig.Collection,
+		}
+
+		resp, err := client.AssignVolume(context.Background(), request)
+		if err != nil {
+			glog.V(0).Infof("assign volume failure %v: %v", request, err)
+			return err
+		}
+		if resp.Error != "" {
+			return fmt.Errorf("assign volume failure %v: %v", request, resp.Error)
+		}
+
+		assignResult.Auth = security.EncodedJwt(resp.Auth)
+		assignResult.Fid = resp.FileId
+		assignResult.Url = resp.Url
+		assignResult.PublicUrl = resp.PublicUrl
+		assignResult.Count = uint64(resp.Count)
+
+		collection, replication = resp.Collection, resp.Replication
+
+		return nil
+	}); err != nil {
+		return nil, nil, err
+	}
+
+	// upload data
+	targetUrl := fmt.Sprintf("http://%s/%s", assignResult.Url, assignResult.Fid)
+	uploadResult, err := operation.UploadData(targetUrl, "", broker.option.Cipher, data, false, "", nil, assignResult.Auth)
+	if err != nil {
+		return nil, nil, fmt.Errorf("upload data %s: %v", targetUrl, err)
+	}
+	// println("uploaded to", targetUrl)
+	return assignResult, uploadResult, nil
+}
+
+func (broker *MessageBroker) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) (err error) {
+
+	for _, filer := range broker.option.Filers {
+		if err = pb.WithFilerClient(filer, broker.grpcDialOption, fn); err != nil {
+			glog.V(0).Infof("fail to connect to %s: %v", filer, err)
+		} else {
+			break
+		}
+	}
+
+	return
+
+}