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Emit exactly one close, and read the socket through a PduTransport

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Ending a session while the link was down emitted nothing: the retried
drop had already torn it down, so close() found nothing left to do. The
terminal event is now guarded by its own flag rather than by `closed`.

The socket, the framer and the parse move to PduTransport, which is what
takes session.ts back under its line cap; `session.sock` reads through a
getter. The backoff also refuses an inverted pair and an unknown key.
This commit is contained in:
Lilleman auf Larv
2026-08-31 21:53:11 +02:00
parent 880454b4f4
commit b2d121b4f3
7 changed files with 179 additions and 85 deletions
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src/session.ts
+40 -70
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@@ -11,14 +11,14 @@ import { DlrMerger } from './dlr-merger.ts';
import { EventEmitter } from 'node:events';
import { IncomingRequests } from './incoming-requests.ts';
import { LinkTimers } from './link-timers.ts';
import { PduFramer } from './pdu-framer.ts';
import { PduTransport } from './pdu-transport.ts';
import { PendingRequests } from './pending-requests.ts';
import { ReconnectLoop } from './reconnect-loop.ts';
import { SendWindow } from './send-window.ts';
import { errorFrom } from './error-from.ts';
import { optionalParamsMinVersion } from './defs/constants.ts';
import { bindCarries, bindCommands, defaultSystemId, defaults } from './session-options.ts';
import { isResp, objToPdu, pduReturn, pduToObj } from './pdu.ts';
import { isResp, objToPdu, pduReturn } from './pdu.ts';
import { silentLog } from './log.ts';
import { submitSms } from './send-sms.ts';
@@ -47,8 +47,6 @@ export class Session extends EventEmitter<SessionEvents> {
declare prependOnceListener: <K extends keyof SessionEvents>(event: K, listener: SessionListener<K>) => this;
declare removeListener: <K extends keyof SessionEvents>(event: K, listener: SessionListener<K>) => this;
/** Replaced on reconnect, so hold the session rather than this. */
sock: Socket;
readonly log: SmppLog;
/** The role the ESME bound with, whichever end of the link this is. Undefined before any bind. */
@@ -64,12 +62,13 @@ export class Session extends EventEmitter<SessionEvents> {
private readonly pending: PendingRequests;
private readonly reconnectLoop: ReconnectLoop | undefined;
private readonly timers: LinkTimers;
private readonly transport: PduTransport;
private readonly window: SendWindow;
private closed = false;
private concatReference = 0;
private draining = false;
private framer = new PduFramer();
private ended = false;
/** A listener that throws is the application's bug; it must not become ours. Hard rule 1. */
override emit<K extends keyof SessionEvents>(
@@ -126,7 +125,6 @@ export class Session extends EventEmitter<SessionEvents> {
});
this.pending = new PendingRequests(this.log);
this.reconnectLoop = this.loopFor(options.reconnect);
this.sock = options.sock;
this.timers = new LinkTimers({
enquireLinkInterval: options.enquireLinkInterval,
idleTimeout: options.idleTimeout,
@@ -135,12 +133,18 @@ export class Session extends EventEmitter<SessionEvents> {
// Not close(): a link that went quiet is a drop, and a drop is what reconnect is for.
onIdle: () => { this.teardown(); },
});
this.transport = this.transportFor(options.sock);
this.window = new SendWindow(options.maxOutstanding ?? defaults.maxOutstanding);
this.attach(options.sock);
this.resetTimers();
}
/** Replaced on reconnect, so hold the session rather than this. */
get sock(): Socket {
return this.transport.sock;
}
/** Whether this session's bind direction carries a command. Consulted by the library's senders. */
bindAllows(cmdName: string): boolean {
return bindCarries(this.boundAs, cmdName);
@@ -187,7 +191,7 @@ export class Session extends EventEmitter<SessionEvents> {
tlvs?: Record<string, TlvInput>,
): Promise<VoidResult> {
const built = pduReturn(pdu, status, params, tlvs);
const sent = built.err ? { err: built.err } : this.write(built.buffer);
const sent = built.err ? { err: built.err } : this.transport.write(built.buffer);
// A peer that unbinds and drops the link takes our response with it; that is not a failure.
if (sent.err && !this.closed) {
@@ -249,6 +253,21 @@ export class Session extends EventEmitter<SessionEvents> {
return drained;
}
private transportFor(sock: Socket): PduTransport {
return new PduTransport({
log: this.log,
onClose: () => { this.onClose(); },
onData: chunk => { this.onData(chunk); },
onError: err => { this.emit('sessionError', err); },
onFramed: pdu => { this.emit('incomingPdu', pdu); },
onPdu: pduObj => { this.dispatch(pduObj); },
onUnreadable: err => {
this.emit('sessionError', err);
this.end();
},
}, sock);
}
private loopFor(reconnect: ReconnectOptions | undefined): ReconnectLoop | undefined {
if (!reconnect) return undefined;
@@ -289,22 +308,9 @@ export class Session extends EventEmitter<SessionEvents> {
return {};
}
/** Wires a freshly opened socket into this session, replacing any previous one. */
private attach(sock: Socket): void {
// The socket being replaced is already dead, and its three handlers still point here.
if (this.sock !== sock) this.sock.removeAllListeners();
this.sock = sock;
this.framer = new PduFramer();
this.transport.attach(sock);
this.closed = false;
sock.on('data', chunk => { this.onData(chunk); });
sock.on('close', () => { this.onClose(); });
sock.on('error', err => {
this.log.warn('session - socket error', { message: err.message });
this.emit('sessionError', err);
this.onClose();
});
}
private async request(
@@ -325,7 +331,7 @@ export class Session extends EventEmitter<SessionEvents> {
signal: options.signal,
timeout: this.options.responseTimeout ?? defaults.responseTimeout,
});
const written = this.write(built.buffer);
const written = this.transport.write(built.buffer);
if (written.err) {
this.pending.settle(seqNr, { err: written.err });
@@ -366,6 +372,15 @@ export class Session extends EventEmitter<SessionEvents> {
this.reconnectLoop?.stop();
this.teardown();
this.dlrMerger.clear();
this.emitClose();
}
/** A session torn down by a drop the loop was retrying reaches here with nothing left to tear down. */
private emitClose(): void {
if (this.ended) return;
this.ended = true;
this.emit('close');
}
private teardown(): void {
@@ -376,10 +391,11 @@ export class Session extends EventEmitter<SessionEvents> {
this.pending.settleAll(new Error('Session closed before a response arrived'));
this.incoming.clear();
this.sock.destroy();
this.emit(this.retrying() ? 'disconnected' : 'close');
if (this.retrying()) this.emit('disconnected');
else this.emitClose();
}
/** A drop the loop will bring the session back from is a disconnect, not the end of it. */
private retrying(): boolean {
return this.reconnectLoop !== undefined && !this.reconnectLoop.isStopped();
}
@@ -390,55 +406,9 @@ export class Session extends EventEmitter<SessionEvents> {
return this.concatReference;
}
private write(pdu: Buffer): VoidResult {
if (this.sock.destroyed) {
return { err: new Error('Socket is closed') };
}
this.sock.write(pdu);
return {};
}
private onData(chunk: Buffer): void {
this.emit('data', chunk);
this.resetTimers();
this.framer.push(chunk);
const framed = this.framer.next();
if (framed.err) {
this.log.warn('session - unusable stream, closing', { message: framed.err.message });
this.emit('sessionError', framed.err);
this.end();
return;
}
for (const pdu of framed.pdus) {
if (!this.receive(pdu)) return;
}
}
/** False means the PDU could not be read and the session has been closed. */
private receive(pdu: Buffer): boolean {
this.emit('incomingPdu', pdu);
const parsed = pduToObj(pdu);
if (parsed.err) {
this.log.warn('session - could not parse an incoming PDU, closing', {
message: parsed.err.message,
});
this.emit('sessionError', parsed.err);
this.end();
return false;
}
this.dispatch(parsed.pduObj);
return true;
}
private dispatch(pduObj: PduObject): void {