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package sttp.client4.ws
import sttp.model.Headers
import sttp.shared.Identity
import sttp.ws.{WebSocket, WebSocketClosed, WebSocketFrame}
/** Allows interacting with a web socket. Interactions can happen:
*
* - on the frame level, by sending and receiving raw [[WebSocketFrame]] s
* - using the provided `receive*` methods to obtain concatenated data frames, or string/byte payloads, and the
* `send*` method to send string/binary frames.
*
* The `send*` and `receive*` methods may result in a failed effect, with either one of [[sttp.ws.WebSocketException]]
* exceptions, or a backend-specific exception. Specifically, they will fail with [[WebSocketClosed]] if the web socket
* is closed.
*
* See the `either` and `eitherClose` method to lift web socket closed events to the value level.
*/
class SyncWebSocket(val delegate: WebSocket[Identity]) {
/** Receive the next frame from the web socket. This can be a data frame, or a control frame including
* [[WebSocketFrame.Close]]. After receiving a close frame, no further interactions with the web socket should
* happen.
*
* However, not all implementations expose the close frame, and web sockets might also get closed without the proper
* close frame exchange. In such cases, as well as when invoking `receive`/`send` after receiving a close frame, a
* [[WebSocketClosed]] exception will be thrown.
*
* *Should be only called sequentially!* (from a single thread/fiber). Because web socket frames might be fragmented,
* calling this method concurrently might result in threads/fibers receiving fragments of the same frame.
*/
def receive(): WebSocketFrame = delegate.receive()
/** Sends a web socket frame. Can be safely called from multiple threads.
*
* May result in an exception, in case of a network error, or if the socket is closed.
*/
def send(f: WebSocketFrame, isContinuation: Boolean = false): Unit = delegate.send(f, isContinuation)
def isOpen(): Boolean = delegate.isOpen()
/** Receive a single data frame, ignoring others. The frame might be a fragment. Will throw [[WebSocketClosed]] if the
* web socket is closed, or if a close frame is received.
*
* *Should be only called sequentially!* (from a single thread/fiber).
*
* @param pongOnPing
* Should a [[WebSocketFrame.Pong]] be sent when a [[WebSocketFrame.Ping]] is received.
*/
def receiveDataFrame(pongOnPing: Boolean = true): WebSocketFrame.Data[_] = delegate.receiveDataFrame(pongOnPing)
/** Receive a single text data frame, ignoring others. The frame might be a fragment. To receive whole messages, use
* [[receiveText]]. Will throw [[WebSocketClosed]] if the web socket is closed, or if a close frame is received.
*
* *Should be only called sequentially!* (from a single thread/fiber).
*
* @param pongOnPing
* Should a [[WebSocketFrame.Pong]] be sent when a [[WebSocketFrame.Ping]] is received.
*/
def receiveTextFrame(pongOnPing: Boolean = true): WebSocketFrame.Text = delegate.receiveTextFrame(pongOnPing)
/** Receive a single binary data frame, ignoring others. The frame might be a fragment. To receive whole messages, use
* [[receiveBinary]]. Will throw [[WebSocketClosed]] if the web socket is closed, or if a close frame is received.
*
* *Should be only called sequentially!* (from a single thread/fiber).
*
* @param pongOnPing
* Should a [[WebSocketFrame.Pong]] be sent when a [[WebSocketFrame.Ping]] is received.
*/
def receiveBinaryFrame(pongOnPing: Boolean = true): WebSocketFrame.Binary = delegate.receiveBinaryFrame(pongOnPing)
/** Receive a single text message (which might come from multiple, fragmented frames). Ignores non-text frames and
* returns combined results. Will throw [[WebSocketClosed]] if the web socket is closed, or if a close frame is
* received.
*
* *Should be only called sequentially!* (from a single thread/fiber).
*
* @param pongOnPing
* Should a [[WebSocketFrame.Pong]] be sent when a [[WebSocketFrame.Ping]] is received.
*/
def receiveText(pongOnPing: Boolean = true): String = delegate.receiveText(pongOnPing)
/** Receive a single binary message (which might come from multiple, fragmented frames). Ignores non-binary frames and
* returns combined results. Will throw [[WebSocketClosed]] if the web socket is closed, or if a close frame is
* received.
*
* *Should be only called sequentially!* (from a single thread/fiber).
*
* @param pongOnPing
* Should a [[WebSocketFrame.Pong]] be sent when a [[WebSocketFrame.Ping]] is received.
*/
def receiveBinary(pongOnPing: Boolean): Array[Byte] = delegate.receiveBinary(pongOnPing)
/** Extracts the received close frame (if available) as the left side of an either, or returns the original result on
* the right.
*
* Will throw [[WebSocketClosed]] if the web socket is closed, but no close frame is available.
*
* @param f
* The effect describing web socket interactions.
*/
def eitherClose[T](f: => T): Either[WebSocketFrame.Close, T] =
try Right(f)
catch {
case WebSocketClosed(Some(close)) => Left(close)
}
/** Returns an effect computing a:
*
* - `Left` if the web socket is closed - optionally with the received close frame (if available).
* - `Right` with the original result otherwise.
*
* Will never throw a [[WebSocketClosed]].
*
* @param f
* The effect describing web socket interactions.
*/
def either[T](f: => T): Either[Option[WebSocketFrame.Close], T] =
try Right(f)
catch {
case WebSocketClosed(close) => Left(close)
}
/** Sends a web socket frame with the given payload. Can be safely called from multiple threads.
*
* May result in an exception, in case of a network error, or if the socket is closed.
*/
def sendText(payload: String): Unit = delegate.sendText(payload)
/** Sends a web socket frame with the given payload. Can be safely called from multiple threads.
*
* May result in an exception, in case of a network error, or if the socket is closed.
*/
def sendBinary(payload: Array[Byte]): Unit = delegate.sendBinary(payload)
/** Idempotent when used sequentially. */
def close(): Unit = delegate.close()
def upgradeHeaders: Headers = delegate.upgradeHeaders
}
