{"record":{"id":"b20bddb8eb0f6566","repo":"JuliusBrussee/caveman","slug":"cachebench-read-trace-w","errorCode":null,"errorMessage":"cachebench: read trace: %w","messagePattern":"cachebench: read trace: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cacheengine/cachebench/trace.go","lineNumber":339,"sourceCode":"\t\tif record.StableSegmentCount < 0 || record.StableSegmentCount > len(record.Prefix) || !validPrefix(record.Prefix) {\n\t\t\treturn nil, fmt.Errorf(\"cachebench: trace line %d: invalid prefix\", line)\n\t\t}\n\t\tif record.Schema == TraceSchema || record.Schema == TraceSchemaV2 {\n\t\t\tif record.ExpectedRPM <= 0 || record.ExpectedCalls <= 0 || !validTimingBasis(record.TimingBasis) {\n\t\t\t\treturn nil, fmt.Errorf(\"cachebench: trace line %d: incomplete replay metadata\", line)\n\t\t\t}\n\t\t}\n\t\tif record.Schema == TraceSchema {\n\t\t\tif record.DeclaredInputTokens <= 0 || record.DeclaredInputTokens < record.PrefixTokens || record.MaxOutputTokens <= 0 || !requestBudgetMatchesBody(record) {\n\t\t\t\treturn nil, fmt.Errorf(\"cachebench: trace line %d: incomplete or mismatched billed-token budget\", line)\n\t\t\t}\n\t\t}\n\t\tseen[record.RequestID] = true\n\t\trecord.Body = append(json.RawMessage(nil), record.Body...)\n\t\trecords = append(records, record)\n\t}\n\tif err := scanner.Err(); err != nil {\n\t\treturn nil, fmt.Errorf(\"cachebench: read trace: %w\", err)\n\t}\n\tif len(records) == 0 {\n\t\treturn nil, errors.New(\"cachebench: no trace records\")\n\t}\n\treturn records, nil\n}\n\n// NativeRequest reconstructs exact optimizer input captured by v2 or v3 trace.\n// Legacy v1 traces remain readable for observation joins, but cannot drive live\n// replay because they omitted routing and economics inputs.\nfunc (record TraceRecord) NativeRequest() (cacheengine.NativeRequest, error) {\n\tif record.Schema != TraceSchema && record.Schema != TraceSchemaV2 {\n\t\treturn cacheengine.NativeRequest{}, fmt.Errorf(\"cachebench: request %q needs %s or %s for reconstruction\", record.RequestID, TraceSchemaV2, TraceSchema)\n\t}\n\tif !validTraceIdentity(record) || !validTimingBasis(record.TimingBasis) || record.ExpectedRPM <= 0 || record.ExpectedCalls <= 0 || record.PrefixTokens < 0 || !validUniqueJSONObject(record.Body) || record.BodySHA256 != bodyDigest(record.Body) || record.StableSegmentCount < 0 || record.StableSegmentCount > len(record.Prefix) || !validPrefix(record.Prefix) {\n\t\treturn cacheengine.NativeRequest{}, fmt.Errorf(\"cachebench: request %q has incomplete or invalid replay identity\", record.RequestID)\n\t}\n\treturn cacheengine.NativeRequest{","sourceCodeStart":321,"sourceCodeEnd":357,"githubUrl":"https://github.com/JuliusBrussee/caveman/blob/27d5a3981a347890211bb1bf2439e5c821a63bc9/cacheengine/cachebench/trace.go#L321-L357","documentation":"Error \"cachebench: read trace: %w\" thrown in JuliusBrussee/caveman.","triggerScenarios":"Thrown at cacheengine/cachebench/trace.go:339 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Fix the trace read error (path/permissions) and retry."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"27d5a3981a347890211bb1bf2439e5c821a63bc9","analyzedAt":"2026-08-15T09:26:11.751Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}