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| 1 | +/* |
| 2 | +Copyright 2026. |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package metrics |
| 18 | + |
| 19 | +import ( |
| 20 | + "context" |
| 21 | + "net/http" |
| 22 | + "net/http/httptest" |
| 23 | + "testing" |
| 24 | + "time" |
| 25 | +) |
| 26 | + |
| 27 | +func TestParseScalarFromQueryResponse(t *testing.T) { |
| 28 | + t.Parallel() |
| 29 | + |
| 30 | + tests := []struct { |
| 31 | + name string |
| 32 | + body string |
| 33 | + wantVal float64 |
| 34 | + wantErr bool |
| 35 | + }{ |
| 36 | + { |
| 37 | + name: "valid scalar response", |
| 38 | + body: `{"status":"success","data":{"resultType":"scalar","result":[1435781451.781,"42.5"]}}`, |
| 39 | + wantVal: 42.5, |
| 40 | + wantErr: false, |
| 41 | + }, |
| 42 | + { |
| 43 | + name: "scalar with fewer than 2 elements", |
| 44 | + body: `{"status":"success","data":{"resultType":"scalar","result":[1435781451.781]}}`, |
| 45 | + wantErr: true, |
| 46 | + }, |
| 47 | + { |
| 48 | + name: "scalar with more than 2 elements", |
| 49 | + body: `{"status":"success","data":{"resultType":"scalar","result":[1435781451.781,"42.5","extra"]}}`, |
| 50 | + wantErr: true, |
| 51 | + }, |
| 52 | + { |
| 53 | + name: "scalar with non-string value", |
| 54 | + body: `{"status":"success","data":{"resultType":"scalar","result":[1435781451.781,42.5]}}`, |
| 55 | + wantErr: true, |
| 56 | + }, |
| 57 | + { |
| 58 | + name: "scalar with non-float string value", |
| 59 | + body: `{"status":"success","data":{"resultType":"scalar","result":[1435781451.781,"invalid"]}}`, |
| 60 | + wantErr: true, |
| 61 | + }, |
| 62 | + { |
| 63 | + name: "valid vector response", |
| 64 | + body: `{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"http_requests_total"},"value":[1435781451.781,"100.5"]}]}}`, |
| 65 | + wantVal: 100.5, |
| 66 | + wantErr: false, |
| 67 | + }, |
| 68 | + { |
| 69 | + name: "empty vector response", |
| 70 | + body: `{"status":"success","data":{"resultType":"vector","result":[]}}`, |
| 71 | + wantErr: true, |
| 72 | + }, |
| 73 | + { |
| 74 | + name: "unsupported resultType", |
| 75 | + body: `{"status":"success","data":{"resultType":"matrix","result":[]}}`, |
| 76 | + wantErr: true, |
| 77 | + }, |
| 78 | + { |
| 79 | + name: "status error", |
| 80 | + body: `{"status":"error","error":"bad query"}`, |
| 81 | + wantErr: true, |
| 82 | + }, |
| 83 | + { |
| 84 | + name: "malformed JSON", |
| 85 | + body: `{"status":`, |
| 86 | + wantErr: true, |
| 87 | + }, |
| 88 | + } |
| 89 | + |
| 90 | + for _, tc := range tests { |
| 91 | + tc := tc |
| 92 | + t.Run(tc.name, func(t *testing.T) { |
| 93 | + t.Parallel() |
| 94 | + got, err := parseScalarFromQueryResponse([]byte(tc.body)) |
| 95 | + if tc.wantErr { |
| 96 | + if err == nil { |
| 97 | + t.Errorf("expected error for %s, got nil", tc.name) |
| 98 | + } |
| 99 | + return |
| 100 | + } |
| 101 | + if err != nil { |
| 102 | + t.Fatalf("unexpected error for %s: %v", tc.name, err) |
| 103 | + } |
| 104 | + if got != tc.wantVal { |
| 105 | + t.Errorf("got %v, want %v", got, tc.wantVal) |
| 106 | + } |
| 107 | + }) |
| 108 | + } |
| 109 | +} |
| 110 | + |
| 111 | +func TestParseLastValueFromRangeResponse(t *testing.T) { |
| 112 | + t.Parallel() |
| 113 | + |
| 114 | + tests := []struct { |
| 115 | + name string |
| 116 | + body string |
| 117 | + wantVal float64 |
| 118 | + wantErr bool |
| 119 | + }{ |
| 120 | + { |
| 121 | + name: "valid range response", |
| 122 | + body: `{"status":"success","data":{"resultType":"matrix","result":[{"metric":{},"values":[[1435781430.781,"10"],[1435781451.781,"20.5"]]}]}}`, |
| 123 | + wantVal: 20.5, |
| 124 | + wantErr: false, |
| 125 | + }, |
| 126 | + { |
| 127 | + name: "empty result", |
| 128 | + body: `{"status":"success","data":{"resultType":"matrix","result":[]}}`, |
| 129 | + wantErr: true, |
| 130 | + }, |
| 131 | + { |
| 132 | + name: "empty values in series", |
| 133 | + body: `{"status":"success","data":{"resultType":"matrix","result":[{"metric":{},"values":[]}]}}`, |
| 134 | + wantErr: true, |
| 135 | + }, |
| 136 | + { |
| 137 | + name: "status error", |
| 138 | + body: `{"status":"error","error":"bad query"}`, |
| 139 | + wantErr: true, |
| 140 | + }, |
| 141 | + { |
| 142 | + name: "malformed json", |
| 143 | + body: `invalid json`, |
| 144 | + wantErr: true, |
| 145 | + }, |
| 146 | + } |
| 147 | + |
| 148 | + for _, tc := range tests { |
| 149 | + tc := tc |
| 150 | + t.Run(tc.name, func(t *testing.T) { |
| 151 | + t.Parallel() |
| 152 | + got, err := parseLastValueFromRangeResponse([]byte(tc.body)) |
| 153 | + if tc.wantErr { |
| 154 | + if err == nil { |
| 155 | + t.Errorf("expected error for %s, got nil", tc.name) |
| 156 | + } |
| 157 | + return |
| 158 | + } |
| 159 | + if err != nil { |
| 160 | + t.Fatalf("unexpected error for %s: %v", tc.name, err) |
| 161 | + } |
| 162 | + if got != tc.wantVal { |
| 163 | + t.Errorf("got %v, want %v", got, tc.wantVal) |
| 164 | + } |
| 165 | + }) |
| 166 | + } |
| 167 | +} |
| 168 | + |
| 169 | +func TestClient_QueryScalar(t *testing.T) { |
| 170 | + t.Parallel() |
| 171 | + |
| 172 | + ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 173 | + if r.URL.Path != "/api/v1/query" { |
| 174 | + http.NotFound(w, r) |
| 175 | + return |
| 176 | + } |
| 177 | + q := r.URL.Query().Get("query") |
| 178 | + if q == "scalar_metric" { |
| 179 | + w.Header().Set("Content-Type", "application/json") |
| 180 | + w.WriteHeader(http.StatusOK) |
| 181 | + _, _ = w.Write([]byte(`{"status":"success","data":{"resultType":"scalar","result":[1435781451.781,"12.34"]}}`)) |
| 182 | + return |
| 183 | + } |
| 184 | + if q == "error_metric" { |
| 185 | + w.WriteHeader(http.StatusBadRequest) |
| 186 | + _, _ = w.Write([]byte(`bad query`)) |
| 187 | + return |
| 188 | + } |
| 189 | + http.Error(w, "unknown query", http.StatusInternalServerError) |
| 190 | + })) |
| 191 | + defer ts.Close() |
| 192 | + |
| 193 | + c := NewClient(ts.URL, WithTimeout(2*time.Second)) |
| 194 | + val, err := c.QueryScalar(context.Background(), "scalar_metric") |
| 195 | + if err != nil { |
| 196 | + t.Fatalf("unexpected error: %v", err) |
| 197 | + } |
| 198 | + if val != 12.34 { |
| 199 | + t.Errorf("expected 12.34, got %v", val) |
| 200 | + } |
| 201 | + |
| 202 | + _, err = c.QueryScalar(context.Background(), "error_metric") |
| 203 | + if err == nil { |
| 204 | + t.Error("expected error for error_metric, got nil") |
| 205 | + } |
| 206 | +} |
| 207 | + |
| 208 | +func TestClient_QueryRange(t *testing.T) { |
| 209 | + t.Parallel() |
| 210 | + |
| 211 | + ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 212 | + if r.URL.Path != "/api/v1/query_range" { |
| 213 | + http.NotFound(w, r) |
| 214 | + return |
| 215 | + } |
| 216 | + w.Header().Set("Content-Type", "application/json") |
| 217 | + w.WriteHeader(http.StatusOK) |
| 218 | + _, _ = w.Write([]byte(`{"status":"success","data":{"resultType":"matrix","result":[{"metric":{},"values":[[1000,"5.5"],[2000,"8.5"]]}]}}`)) |
| 219 | + })) |
| 220 | + defer ts.Close() |
| 221 | + |
| 222 | + c := NewClient(ts.URL) |
| 223 | + now := time.Now() |
| 224 | + val, err := c.QueryRange(context.Background(), "range_query", now.Add(-10*time.Minute), now, time.Minute) |
| 225 | + if err != nil { |
| 226 | + t.Fatalf("unexpected error: %v", err) |
| 227 | + } |
| 228 | + if val != 8.5 { |
| 229 | + t.Errorf("expected 8.5, got %v", val) |
| 230 | + } |
| 231 | +} |
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