Separate out remote read responses.

Fixes #2574

documentation/examples/remote_storage/remote_storage_bridge/influxdb/client.go

@@ -124,10 +124,12 @@ func (c *Client) Read(req *remote.ReadRequest) (*remote.ReadResponse, error) {
 	}
 
 	resp := remote.ReadResponse{
-		Timeseries: make([]*remote.TimeSeries, 0, len(labelsToSeries)),
+		Results: []*remote.QueryResult{
+			{Timeseries: make([]*remote.TimeSeries, 0, len(labelsToSeries))},
+		},
 	}
 	for _, ts := range labelsToSeries {
-		resp.Timeseries = append(resp.Timeseries, ts)
+		resp.Results[0].Timeseries = append(resp.Results[0].Timeseries, ts)
 	}
 	return &resp, nil
 }

storage/remote/client.go

@@ -173,7 +173,11 @@ func (c *Client) Read(ctx context.Context, from, through model.Time, matchers me
 		return nil, fmt.Errorf("unable to unmarshal response body: %v", err)
 	}
 
-	return matrixFromProto(resp.Timeseries), nil
+	if len(resp.Results) != len(req.Queries) {
+		return nil, fmt.Errorf("responses: want %d, got %d", len(req.Queries), len(resp.Results))
+	}
+
+	return matrixFromProto(resp.Results[0].Timeseries), nil
 }
 
 func labelMatchersToProto(matchers metric.LabelMatchers) []*LabelMatcher {

storage/remote/remote.pb.go

@@ -17,6 +17,7 @@ It has these top-level messages:
 	ReadResponse
 	Query
 	LabelMatcher
+	QueryResult
 */
 package remote
 
@@ -72,6 +73,20 @@ func (m *Sample) String() string            { return proto.CompactTextString(m)
 func (*Sample) ProtoMessage()               {}
 func (*Sample) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
 
+func (m *Sample) GetValue() float64 {
+	if m != nil {
+		return m.Value
+	}
+	return 0
+}
+
+func (m *Sample) GetTimestampMs() int64 {
+	if m != nil {
+		return m.TimestampMs
+	}
+	return 0
+}
+
 type LabelPair struct {
 	Name  string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
 	Value string `protobuf:"bytes,2,opt,name=value" json:"value,omitempty"`
@@ -82,6 +97,20 @@ func (m *LabelPair) String() string            { return proto.CompactTextString(
 func (*LabelPair) ProtoMessage()               {}
 func (*LabelPair) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
 
+func (m *LabelPair) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *LabelPair) GetValue() string {
+	if m != nil {
+		return m.Value
+	}
+	return ""
+}
+
 type TimeSeries struct {
 	Labels []*LabelPair `protobuf:"bytes,1,rep,name=labels" json:"labels,omitempty"`
 	// Sorted by time, oldest sample first.
@@ -140,7 +169,8 @@ func (m *ReadRequest) GetQueries() []*Query {
 }
 
 type ReadResponse struct {
-	Timeseries []*TimeSeries `protobuf:"bytes,1,rep,name=timeseries" json:"timeseries,omitempty"`
+	// In same order as the request's queries.
+	Results []*QueryResult `protobuf:"bytes,1,rep,name=results" json:"results,omitempty"`
 }
 
 func (m *ReadResponse) Reset()                    { *m = ReadResponse{} }
@@ -148,9 +178,9 @@ func (m *ReadResponse) String() string            { return proto.CompactTextStri
 func (*ReadResponse) ProtoMessage()               {}
 func (*ReadResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
 
-func (m *ReadResponse) GetTimeseries() []*TimeSeries {
+func (m *ReadResponse) GetResults() []*QueryResult {
 	if m != nil {
-		return m.Timeseries
+		return m.Results
 	}
 	return nil
 }
@@ -166,6 +196,20 @@ func (m *Query) String() string            { return proto.CompactTextString(m) }
 func (*Query) ProtoMessage()               {}
 func (*Query) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
 
+func (m *Query) GetStartTimestampMs() int64 {
+	if m != nil {
+		return m.StartTimestampMs
+	}
+	return 0
+}
+
+func (m *Query) GetEndTimestampMs() int64 {
+	if m != nil {
+		return m.EndTimestampMs
+	}
+	return 0
+}
+
 func (m *Query) GetMatchers() []*LabelMatcher {
 	if m != nil {
 		return m.Matchers
@@ -184,6 +228,43 @@ func (m *LabelMatcher) String() string            { return proto.CompactTextStri
 func (*LabelMatcher) ProtoMessage()               {}
 func (*LabelMatcher) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7} }
 
+func (m *LabelMatcher) GetType() MatchType {
+	if m != nil {
+		return m.Type
+	}
+	return MatchType_EQUAL
+}
+
+func (m *LabelMatcher) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+func (m *LabelMatcher) GetValue() string {
+	if m != nil {
+		return m.Value
+	}
+	return ""
+}
+
+type QueryResult struct {
+	Timeseries []*TimeSeries `protobuf:"bytes,1,rep,name=timeseries" json:"timeseries,omitempty"`
+}
+
+func (m *QueryResult) Reset()                    { *m = QueryResult{} }
+func (m *QueryResult) String() string            { return proto.CompactTextString(m) }
+func (*QueryResult) ProtoMessage()               {}
+func (*QueryResult) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{8} }
+
+func (m *QueryResult) GetTimeseries() []*TimeSeries {
+	if m != nil {
+		return m.Timeseries
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*Sample)(nil), "remote.Sample")
 	proto.RegisterType((*LabelPair)(nil), "remote.LabelPair")
@@ -193,36 +274,39 @@ func init() {
 	proto.RegisterType((*ReadResponse)(nil), "remote.ReadResponse")
 	proto.RegisterType((*Query)(nil), "remote.Query")
 	proto.RegisterType((*LabelMatcher)(nil), "remote.LabelMatcher")
+	proto.RegisterType((*QueryResult)(nil), "remote.QueryResult")
 	proto.RegisterEnum("remote.MatchType", MatchType_name, MatchType_value)
 }
 
 func init() { proto.RegisterFile("remote.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	// 424 bytes of a gzipped FileDescriptorProto
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 }

storage/remote/remote.proto

@@ -40,7 +40,8 @@ message ReadRequest {
 }
 
 message ReadResponse {
-  repeated TimeSeries timeseries = 1;
+  // In same order as the request's queries.
+  repeated QueryResult results = 1;
 }
 
 message Query {
@@ -61,3 +62,7 @@ message LabelMatcher {
   string name = 2;
   string value = 3;
 }
+
+message QueryResult {
+  repeated TimeSeries timeseries = 1;
+}