MergeResponse merges multiple Response into one.
(ctx context.Context, sumStats bool, req Request, responses ...Response)
| 39 | |
| 40 | // MergeResponse merges multiple Response into one. |
| 41 | func MergeResponse(ctx context.Context, sumStats bool, req Request, responses ...Response) (Response, error) { |
| 42 | if len(responses) == 1 { |
| 43 | return responses[0], nil |
| 44 | } |
| 45 | promResponses := make([]*PrometheusResponse, 0, len(responses)) |
| 46 | warnings := make([][]string, 0, len(responses)) |
| 47 | infos := make([][]string, 0, len(responses)) |
| 48 | for _, resp := range responses { |
| 49 | promResponses = append(promResponses, resp.(*PrometheusResponse)) |
| 50 | if w := resp.(*PrometheusResponse).Warnings; w != nil { |
| 51 | warnings = append(warnings, w) |
| 52 | } |
| 53 | if i := resp.(*PrometheusResponse).Infos; i != nil { |
| 54 | infos = append(infos, i) |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | // Check if it is a range query. Range query passed req as nil since |
| 59 | // we only use request when result type is a vector. |
| 60 | if req == nil { |
| 61 | sort.Sort(byFirstTime(promResponses)) |
| 62 | } |
| 63 | var data PrometheusData |
| 64 | // For now, we only shard queries that returns a vector. |
| 65 | switch promResponses[0].Data.ResultType { |
| 66 | case model.ValVector.String(): |
| 67 | v, err := vectorMerge(ctx, req, promResponses) |
| 68 | if err != nil { |
| 69 | return nil, err |
| 70 | } |
| 71 | data = PrometheusData{ |
| 72 | ResultType: model.ValVector.String(), |
| 73 | Result: PrometheusQueryResult{ |
| 74 | Result: &PrometheusQueryResult_Vector{ |
| 75 | Vector: v, |
| 76 | }, |
| 77 | }, |
| 78 | Stats: statsMerge(sumStats, promResponses), |
| 79 | } |
| 80 | case model.ValMatrix.String(): |
| 81 | sampleStreams, err := matrixMerge(ctx, promResponses) |
| 82 | if err != nil { |
| 83 | return nil, err |
| 84 | } |
| 85 | |
| 86 | data = PrometheusData{ |
| 87 | ResultType: model.ValMatrix.String(), |
| 88 | Result: PrometheusQueryResult{ |
| 89 | Result: &PrometheusQueryResult_Matrix{ |
| 90 | Matrix: &Matrix{ |
| 91 | SampleStreams: sampleStreams, |
| 92 | }, |
| 93 | }, |
| 94 | }, |
| 95 | Stats: statsMerge(sumStats, promResponses), |
| 96 | } |
| 97 | default: |
| 98 | return nil, fmt.Errorf("unexpected result type: %s", promResponses[0].Data.ResultType) |
no test coverage detected