Struct Metadata 

pub struct Metadata {
    pub tenant_id: String,
    pub user_id: String,
    pub project_id: String,
    pub purpose: String,
    pub correlation_id: String,
    pub service_identity: String,
    pub client_catalog_version: String,
    pub scopes: Vec<String>,
    pub bearer_token: String,
}

Identity and audit context for a connection.

Split deliberately into two halves, mirroring the other UDB SDKs:

• Identity — tenant, user, project, scopes, service identity — is authoritative for the connection and is never overridden per request. Letting a caller pass a different tenant per call would make the isolation boundary a client-side suggestion.
• Audit — purpose, correlation id, catalog version — is request-scoped and may be varied per call via Metadata::with_audit.

Fields

tenant_id: String

user_id: String

project_id: String

purpose: String

correlation_id: String

service_identity: String

client_catalog_version: String

scopes: Vec<String>

bearer_token: String

Bearer credential. Sent as authorization: Bearer <token> when non-empty.

Implementations

impl Metadata

pub fn new(tenant_id: impl Into<String>) -> Self

Metadata for tenant_id, which is the minimum the broker requires.

pub fn with_project(self, project_id: impl Into<String>) -> Self

pub fn with_user(self, user_id: impl Into<String>) -> Self

pub fn with_bearer_token(self, token: impl Into<String>) -> Self

pub fn with_scopes<I, S>(self, scopes: I) -> Self

where I: IntoIterator<Item = S>, S: Into<String>,

pub fn with_audit( self, purpose: impl Into<String>, correlation_id: impl Into<String>, ) -> Self

Request-scoped audit fields, leaving identity untouched.

pub fn apply<T>(&self, request: &mut Request<T>) -> Result<(), Status>

Apply every non-empty field to an outgoing request.

Empty values are omitted rather than sent blank: the broker treats a present-but-empty header differently from an absent one on some paths, and sending x-scopes: "" is not the same as claiming no scopes.

pub fn apply_to_map(&self, md: &mut MetadataMap) -> Result<(), Status>

Trait Implementations

impl Clone for Metadata

fn clone(&self) -> Metadata

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Metadata

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Metadata

fn default() -> Metadata

Returns the “default value” for a type.

impl Eq for Metadata

impl PartialEq for Metadata

fn eq(&self, other: &Metadata) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Metadata