{"record":{"id":"29d9170adb7d2960","repo":"OpenNHP/opennhp","slug":"error-generating-spoid-v","errorCode":null,"errorMessage":"error generating spoId: %v","messagePattern":"error generating spoId: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"endpoints/db/utils.go","lineNumber":152,"sourceCode":"\t\treturn common.SmartPolicy{}, fmt.Errorf(\"could not open file: %v\", err)\n\t}\n\tdefer file.Close()\n\n\tfileContentByte, err := io.ReadAll(file)\n\tif err != nil {\n\t\treturn common.SmartPolicy{}, fmt.Errorf(\"error reading file: %v\", err)\n\t}\n\n\tvar config common.SmartPolicy\n\n\terr = json.Unmarshal(fileContentByte, &config)\n\tif err != nil {\n\t\treturn common.SmartPolicy{}, fmt.Errorf(\"json parsing error: %s\", err)\n\t}\n\n\tspoId, err := utils.GenerateUUIDv4()\n\tif err != nil {\n\t\treturn common.SmartPolicy{}, fmt.Errorf(\"error generating spoId: %v\", err)\n\t}\n\n\tconfig.PolicyId = spoId\n\n\treturn config, nil\n}\n\nfunc (a *AppParams) GetMetadata() (string, error) {\n\tif a.Metadata == \"\" {\n\t\treturn \"\", nil\n\t}\n\n\tcontent, err := os.ReadFile(a.Metadata)\n\tif err != nil {\n\t\treturn \"\", err\n\t}\n\n\treturn string(content), nil","sourceCodeStart":134,"sourceCodeEnd":170,"githubUrl":"https://github.com/OpenNHP/opennhp/blob/6e04ca5ff03222a699c24205cd4bf8fee9af7ffe/endpoints/db/utils.go#L134-L170","documentation":"NewSmartPolicy loads a smart-policy JSON file, unmarshals it into common.SmartPolicy, then assigns a fresh identifier via utils.GenerateUUIDv4(). The error 'error generating spoId: %v' wraps any failure from that UUID generator, meaning the runtime could not produce a new UUIDv4 for the policy. In practice this almost always indicates the underlying source of randomness (crypto/rand) failed on the host, since the ID generation itself takes no user input.","triggerScenarios":"Calling AppParams.NewSmartPolicy (via the nhp-db runApp flow) after the policy JSON parses successfully, when utils.GenerateUUIDv4() returns a non-nil error — i.e. crypto/rand entropy read failure, e.g. exhausted or blocked /dev/urandom in a restricted container.","commonSituations":"Running nhp-db inside a hardened container or sandbox where /dev/urandom is unavailable or open files are capped; hitting the process file-descriptor limit so crypto/rand's internal open fails; misconfigured seccomp profiles blocking getrandom(2).","solutions":["Check the wrapped error in the message to identify the underlying entropy failure (e.g. 'open /dev/urandom: too many open files') and fix that root cause","Verify /dev/urandom is available and getrandom(2) is permitted in the container/seccomp config","Raise the process file-descriptor limit (ulimit -n) if exhaustion is the cause","Retry the run — crypto/rand failures are usually transient host-level issues","Upgrade Go: modern versions use getrandom(2) which rarely fails on Linux"],"exampleFix":"// before\nspoId, err := utils.GenerateUUIDv4()\nif err != nil {\n    return common.SmartPolicy{}, fmt.Errorf(\"error generating spoId: %v\", err)\n}\n// after\nspoId, err := utils.GenerateUUIDv4()\nif err != nil {\n    log.Errorf(\"UUIDv4 generation failed: %v\", err)\n    return common.SmartPolicy{}, fmt.Errorf(\"error generating spoId: %w\", err)\n}","handlingStrategy":"try-catch","validationCode":"// no pre-call validation possible; UUID gen takes no input\n// ensure entropy source works on this host at startup:\nf, err := os.OpenFile(\"/dev/urandom\", os.O_RDONLY, 0)\nif err != nil {\n    log.Fatalf(\"no entropy source available: %v\", err)\n}\nf.Close()","typeGuard":null,"tryCatchPattern":"sp, err := params.NewSmartPolicy()\nif err != nil {\n    if strings.Contains(err.Error(), \"error generating spoId\") {\n        log.Errorf(\"entropy failure, check /dev/urandom and fd limits: %v\", err)\n        // retry after fixing host conditions\n    }\n    return err\n}","preventionTips":["Verify /dev/urandom and getrandom(2) work in your container before deploying","Raise RLIMIT_NOFILE so crypto/rand never hits fd exhaustion","Log the wrapped error with %w so root cause is visible","Treat UUID generation failures as host-level health alerts"],"tags":["go","uuid","randomness","nhp-db"],"backgroundTag":"internal-invariant-violation","analyzedSha":"6e04ca5ff03222a699c24205cd4bf8fee9af7ffe","analyzedAt":"2026-09-07T15:44:59.941Z","contentChangedAt":"2026-09-07T15:44:59.941Z","schemaVersion":2},"datasetVersion":"2026-09-16T04:17:20.429Z"}