SigNoz/signoz · error · errors.SignozError

ErrCodeInvalidResolver

ErrCodeInvalidResolver

Error message

cannot build resolver, no uris have been provided

What it means

Returned by NewResolver when ResolverConfig.Uris is empty — the config resolver has no configuration sources to read from, so it cannot be constructed. It fails fast to avoid a resolver that would silently resolve nothing.

Source

Thrown at pkg/config/resolver.go:31

type ResolverConfig struct {
	// Each string or `uri` must follow "<scheme>:<value>" format. This format is compatible with the URI definition
	// defined at https://datatracker.ietf.org/doc/html/rfc3986".
	// It is required to have at least one uri.
	Uris []string

	// ProviderFactories is a slice of Provider factories.
	// It is required to have at least one factory.
	ProviderFactories []ProviderFactory
}

type Resolver struct {
	uris      []Uri
	providers map[string]Provider
}

func NewResolver(config ResolverConfig) (*Resolver, error) {
	if len(config.Uris) == 0 {
		return nil, errors.New(errors.TypeInvalidInput, ErrCodeInvalidResolver, "cannot build resolver, no uris have been provided")
	}

	if len(config.ProviderFactories) == 0 {
		return nil, errors.New(errors.TypeInvalidInput, ErrCodeInvalidResolver, "cannot build resolver, no providers have been provided")
	}

	uris := make([]Uri, len(config.Uris))
	for i, inputUri := range config.Uris {
		uri, err := NewUri(inputUri)
		if err != nil {
			return nil, err
		}

		uris[i] = uri
	}

	providers := make(map[string]Provider, len(config.ProviderFactories))
	for _, factory := range config.ProviderFactories {

View on GitHub (pinned to 5069bf80b0)

Solutions

1. Pass at least one config URI: set Uris: []string{"file:///etc/signoz/config.yaml"} or equivalent --config flag
2. If defaults are expected, populate them before calling NewResolver/New
3. Check that code building the Uris slice actually appends (not just declares) entries

Example fix

// before
res, err := config.NewResolver(config.ResolverConfig{}) // error

// after
res, err := config.NewResolver(config.ResolverConfig{Uris: []string{"file:///etc/signoz/config.yaml"}, ProviderFactories: ...})

if len(cfg.Uris) == 0 {
    cfg.Uris = []string{"file:///etc/signoz/config.yaml"} // sensible default
}
res, err := config.NewResolver(cfg)

When it happens

Trigger: Calling config.NewResolver (usually via config.New) with ResolverConfig{Uis: nil} or an empty Uris slice, e.g. when no --config flag and no env/file URIs are supplied.

Common situations: CLI invoked without any --config=/path/file.yaml argument; config loading code that conditionally appends URIs and the condition never fired; default config URI removed in a refactor.

Related errors

• ErrCodeInvalidGatewayConfig
• CodeInvalidInput
• CodeInvalidInput
• ErrCodeIncorrectPassword
• CodeTooManyRequests

AI-assisted analysis of SigNoz/signoz@5069bf80b0 (2026-08-28). Data as JSON: /api/errors/d088579593084a91. Report an issue: GitHub.