grpc session ping when session is destoryed by server

[zhtswang]

Problem description

When a session call ping, if the session is destoryed by the server. it will throw an error.
Error [ERR_HTTP2_INVALID_SESSION]: The session has been destroyed
at new NodeError (internal/errors.js:322:7)
at ClientHttp2Session.ping (internal/http2/core.js:1317:13)
at Subchannel.sendPing (D:\app\node_modules@grpc\grpc-js\src\subchannel.ts:367:19)
at Timeout._onTimeout (D:\app\node_modules@grpc\grpc-js\src\subchannel.ts:376:12)
at listOnTimeout (internal/timers.js:557:17)
at processTimers (internal/timers.js:500:7)

[emmansun]

How about to check session!.destroyed first?

  private sendPing() {
    if (this.session!.destroyed) {
      this.keepaliveTrace('Session was destroyed');
      this.handleDisconnect();
      return;
    }
    if (this.channelzEnabled) {
      this.keepalivesSent += 1;
    }
    this.keepaliveTrace('Sending ping with timeout ' + this.keepaliveTimeoutMs + 'ms');
    this.keepaliveTimeoutId = setTimeout(() => {
      this.keepaliveTrace('Ping timeout passed without response');
      this.handleDisconnect();
    }, this.keepaliveTimeoutMs);
    this.keepaliveTimeoutId.unref?.();
    this.session!.ping(
      (err: Error | null, duration: number, payload: Buffer) => {
        this.keepaliveTrace('Received ping response');
        clearTimeout(this.keepaliveTimeoutId);
      }
    );
  }

[murgatroid99]

This should be fixed in version 1.6.9. Please try it out.

[emmansun]

Thx @murgatroid99 , we'll try it out.

[zhtswang]

@murgatroid99, we have applied the version to our production environment and monitor one more week, no such issue happened again. Please close the issue.