{"record":{"id":"f664c523679d72af","repo":"gofr-dev/gofr","slug":"failed-to-read-token-from-s-w","errorCode":null,"errorMessage":"failed to read token from %s: %w","messagePattern":"failed to read token from (.+?): %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"pkg/gofr/service/file_token_auth.go","lineNumber":98,"sourceCode":"// The token file is read eagerly: a missing or empty file returns an error so\n// misconfiguration is caught at startup rather than at the first upstream call.\n// The logger is supplied automatically by NewHTTPService via the\n// Observable hook; until it arrives, background-refresh failures are\n// silent.\nfunc NewFileTokenAuthConfig(opts ...FileTokenAuthOption) (*FileTokenAuthConfig, error) {\n\tf := &FileTokenAuthConfig{\n\t\ttokenFilePath:   DefaultTokenFilePath,\n\t\trefreshInterval: defaultRefreshInterval,\n\t\tdone:            make(chan struct{}),\n\t}\n\n\tfor _, opt := range opts {\n\t\topt(f)\n\t}\n\n\ttoken, err := readToken(f.tokenFilePath)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to read token from %s: %w\", f.tokenFilePath, err)\n\t}\n\n\tf.token = token\n\n\tgo f.refreshLoop()\n\n\treturn f, nil\n}\n\n// AddOption implements Options.\nfunc (f *FileTokenAuthConfig) AddOption(h HTTP) HTTP {\n\treturn &fileTokenDecorator{source: f, HTTP: h}\n}\n\n// SetLogger implements Observable. NewHTTPService calls this with the\n// HTTP service's logger so background-refresh failures can be surfaced at WARN\n// level. If l does not satisfy logging.Logger (the richer interface with\n// Warnf), the logger stays unset and refresh failures remain silent rather","sourceCodeStart":80,"sourceCodeEnd":116,"githubUrl":"https://github.com/gofr-dev/gofr/blob/187eb24962502e91f1fee856230670958b66e89c/pkg/gofr/service/file_token_auth.go#L80-L116","documentation":"NewFileTokenAuthConfig wraps any failure from readToken (missing file, permission error, or empty token file) as \"failed to read token from %s: %w\" (file_token_auth.go:98). The token is read eagerly at construction so a bad token path or unreadable file aborts startup instead of failing lazily on the first upstream HTTP call.","triggerScenarios":"Calling NewFileTokenAuthConfig — directly or via main / NewHTTPService options / tests — when the file at the configured (or default K8s) token path does not exist, is unreadable, or is empty; os.ReadFile returns its error and readToken's errEmptyTokenFile is wrapped here.","commonSituations":"Running outside Kubernetes with the default /var/run/secrets/kubernetes.io/serviceaccount/token path absent; typo in WithTokenFilePath; token volume not mounted (automountServiceAccountToken: false); file permissions after a security hardening change.","solutions":["Read the wrapped cause (os.PathError vs 'token file is empty') to decide between fixing the path and fixing file contents.","Mount the service-account projected volume or set automountServiceAccountToken: true in the pod spec.","Pass the correct file via WithTokenFilePath for non-K8s or custom mounts.","Guard construction at startup so the process fails fast and orchestrators restart it once the volume appears."],"exampleFix":"// before\nauth, err := service.NewFileTokenAuthConfig() // default path missing outside K8s\n// after\nif _, statErr := os.Stat(tokenPath); statErr == nil {\n    auth, err = service.NewFileTokenAuthConfig(service.WithTokenFilePath(tokenPath))\n}","handlingStrategy":"try-catch","validationCode":"if _, err := os.Stat(tokenPath); err != nil {\n\treturn fmt.Errorf(\"token file %s not available: %w\", tokenPath, err)\n}","typeGuard":"var pathErr *os.PathError\nif errors.As(err, &pathErr) { /* missing/unreadable file vs empty content */ }","tryCatchPattern":"cfg, err := service.NewFileTokenAuthConfig(opts...)\nif err != nil {\n\tif errors.Is(err, errEmptyTokenFile) { /* fix file contents */ }\n\telse if errors.As(err, &pathErr) { /* fix path/mount */ }\n\treturn err // fail startup fast\n}","preventionTips":["Set automountServiceAccountToken: true or mount the projected volume explicitly in the pod spec.","Prefer WithTokenFilePath over relying on the K8s default path in non-K8s environments.","Treat constructor failure as fatal — the eager read exists so you fail at startup.","Log the full wrapped error chain (%w) to distinguish missing file from empty file."],"tags":["kubernetes","auth","startup","file-io"],"backgroundTag":"credential-file-unreadable","analyzedSha":"187eb24962502e91f1fee856230670958b66e89c","analyzedAt":"2026-09-01T20:34:54.554Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}