Update Coordinator client, add datagram assembly.

logdog/client/coordinator/list.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package coordinator
 
 import (
+        "fmt"
+
         "github.com/luci/luci-go/common/config"
         "github.com/luci/luci-go/logdog/api/endpoints/coordinator/logs/v1"
         "github.com/luci/luci-go/logdog/common/types"
         "golang.org/x/net/context"
 )
 
 // ListResult is a single returned list entry.
 type ListResult struct {
         // Project is the project that this result is bound to.
         Project config.ProjectName
@@ skipping 61 matching lines @@
                                 PathBase: types.StreamPath(resp.PathBase),
                                 Name:     s.Name,
                         }
                         switch s.Type {
                         case logdog.ListResponse_Component_PATH:
                                 break
 
                         case logdog.ListResponse_Component_STREAM:
                                 lr.Stream = true
                                 if s.State != nil {
-                                        lr.State = loadLogStream(resp.Project, lr.FullPath(), s.State, s.Desc)
+                                        lr.State, err = loadLogStream(resp.Project, lr.FullPath(), s.State, s.Desc)
+                                        if err != nil {
+                                                return fmt.Errorf("failed to load stream state: %v", err)
+                                        }
                                 }
 
                         case logdog.ListResponse_Component_PROJECT:
                                 lr.Project = config.ProjectName(lr.Name)
                         }
 
                         if !cb(&lr) {
                                 return nil
                         }
                 }
 
                 if resp.Next == "" {
                         return nil
                 }
                 req.Next = resp.Next
         }
 }