RTCDtlsTransport.state - Web APIs 编辑

The state read-only property of the RTCDtlsTransport interface provides information which describes a Datagram Transport Layer Security (DTLS) transport state.

Syntax

let myState = dtlsTransport.state;

Value

A string whose value is taken from the RTCDtlsTransportState enumerated type. Its value is one of the following:

new

The initial state when DTLS has not started negotiating yet.

connecting

DTLS is in the process of negotiating a secure connection and verifying the remote fingerprint.

connected

DTLS has completed negotiation of a secure connection and verified the remote fingerprint.

closed

The transport has been closed intentionally as the result of receipt of a close_notify alert, or calling RTCPeerConnection.close().

failed

The transport has failed as the result of an error (such as receipt of an error alert or failure to validate the remote fingerprint).

Examples

This example presents a function, tallySenders(), which iterates over an RTCPeerConnection's RTCRtpSenders, tallying up how many of them are in various states. The function returns an object containing properties whose values indicate how many of the senders are in each state.

let pc = new RTCPeerConnection({ bundlePolicy: "max-bundle" });

/* ... */

function tallySenders(pc) {
  let results = {
    transportMissing: 0,
    connectionPending: 0,
    connected: 0,
    closed: 0,
    failed: 0,
    unknown: 0
  };

  let senderList = pc.getSenders();
  senderList.forEach(sender => {
    let transport = sender.transport;

    if (!transport) {
      results.transportMissing++;
    } else {
      switch(transport.state) {
        case "new":
        case "connecting":
          results.connectionPending++;
          break;
       case "connected":
          results.connected++;
          break;
       case "closed":
          results.closed++;
          break;
       case "failed":
          results.failed++;
          break;
       default:
          results.unknown++;
          break;
      }
    }
  });
  return results;
}

Note that in this code, the new and connecting states are being treated as a single connectionPending status in the returned object.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• WebRTC API
• RTCDtlsTransport