async function startSession()

in components/app.tsx [30:96]
52 lines of code
7 McCabe index (conditional complexity)

  async function startSession() {
    try {
      if (!isSessionStarted) {
        setIsSessionStarted(true);
        // Get an ephemeral session token
        const session = await fetch("/api/session").then((response) =>
          response.json()
        );
        const sessionToken = session.client_secret.value;
        const sessionId = session.id;

        console.log("Session id:", sessionId);

        // Create a peer connection
        const pc = new RTCPeerConnection();

        // Set up to play remote audio from the model
        if (!audioElement.current) {
          audioElement.current = document.createElement("audio");
        }
        audioElement.current.autoplay = true;
        pc.ontrack = (e) => {
          if (audioElement.current) {
            audioElement.current.srcObject = e.streams[0];
          }
        };

        const stream = await navigator.mediaDevices.getUserMedia({
          audio: true,
        });

        stream.getTracks().forEach((track) => {
          const sender = pc.addTrack(track, stream);
          if (sender) {
            tracks.current = [...(tracks.current || []), sender];
          }
        });

        // Set up data channel for sending and receiving events
        const dc = pc.createDataChannel("oai-events");
        setDataChannel(dc);

        // Start the session using the Session Description Protocol (SDP)
        const offer = await pc.createOffer();
        await pc.setLocalDescription(offer);

        const sdpResponse = await fetch(`${BASE_URL}?model=${MODEL}`, {
          method: "POST",
          body: offer.sdp,
          headers: {
            Authorization: `Bearer ${sessionToken}`,
            "Content-Type": "application/sdp",
          },
        });

        const answer: RTCSessionDescriptionInit = {
          type: "answer",
          sdp: await sdpResponse.text(),
        };
        await pc.setRemoteDescription(answer);

        peerConnection.current = pc;
      }
    } catch (error) {
      console.error("Error starting session:", error);
    }
  }