API Reference

The Function binding enables direct function-to-function invocation — low-latency internal calls that bypass public endpoints.

invoke

Invokes a function with a full HTTP request.

const response = await func.invoke(request)
// response: { status: number, headers: Record<string, string>, body: Uint8Array }

let response = func.invoke(FunctionInvokeRequest {
    target_function: "processor".into(),
    method: "POST".into(),
    path: "/resize".into(),
    headers: BTreeMap::new(),
    body: payload_bytes,
    timeout: Some(Duration::from_secs(30)),
}).await?;

Parameter	Type	Required	Description
`request.targetFunction`	`string`	Yes	Function name or identifier.
`request.method`	`string`	Yes	HTTP method (GET, POST, PUT, DELETE, etc.).
`request.path`	`string`	Yes	Request path (e.g., `/resize`).
`request.headers`	`Record<string, string>`	No	HTTP headers.
`request.body`	`Uint8Array`	No	Request body as bytes.
`request.timeoutMs`	`number`	No	Timeout in milliseconds.

Returns: FunctionInvokeResponse — { status: number, headers: Record<string, string>, body: Uint8Array }

invokeJson

High-level JSON invocation with typed request and response.

const result = await func.invokeJson<TReq, TRes>(
  targetFunction: string,
  body: TReq,
  options?: {
    method?: string       // default: "POST"
    path?: string         // default: "/"
    headers?: Record<string, string>
    timeoutMs?: number
  }
): Promise<TRes>

Automatically serializes the request body as JSON and parses the response body as JSON.

get

Convenience method for GET requests with a typed JSON response.

const result = await func.get<TRes>(
  targetFunction: string,
  path?: string,
  options?: {
    headers?: Record<string, string>
    timeoutMs?: number
  }
): Promise<TRes>

getUrl

Returns the function's public URL, if it has public ingress configured.

const url = await func.getUrl(): Promise<string | undefined>

async fn get_function_url(&self) -> Result<Option<String>>

Returns undefined / None if the function has private ingress only.

Types

FunctionInvokeRequest

interface FunctionInvokeRequest {
  targetFunction: string
  method: string
  path: string
  headers?: Record<string, string>
  body?: Uint8Array
  timeoutMs?: number
}

pub struct FunctionInvokeRequest {
    pub target_function: String,
    pub method: String,
    pub path: String,
    pub headers: BTreeMap<String, String>,
    pub body: Vec<u8>,
    pub timeout: Option<Duration>,
}

FunctionInvokeResponse

interface FunctionInvokeResponse {
  status: number
  headers: Record<string, string>
  body: Uint8Array
}

pub struct FunctionInvokeResponse {
    pub status: u16,
    pub headers: BTreeMap<String, String>,
    pub body: Vec<u8>,
}