Name carry()'s retry condition and what ends its loop

src/link-gate.ts

@@ -42,6 +42,11 @@ export class LinkGate {
 		return this.up;
 	}
 
+	/** Shut, with another link on its way to reopen it. */
+	awaitsNextLink(): boolean {
+		return !this.up && this.returning;
+	}
+
 	/** Why the gate will never admit a request, or undefined while one may still get through. */
 	refusal(): Error | undefined {
 		return this.up || this.returning ? undefined : over();

src/outgoing-requests.ts

@@ -93,11 +93,14 @@ export class OutgoingRequests {
 			return Promise.resolve({ err: new Error('Session is shutting down') });
 		}
 
-		return this.pastDrain(input, options);
+		return this.carry(input, options);
 	}
 
-	/** The same path without that refusal, which a receipt for a held message has to take. */
-	async pastDrain(
+	/**
+	 * The same path without the drain's refusal, which a receipt for a held message has to take.
+	 * It ends with the first attempt that reached the socket, or once no next link will carry it.
+	 */
+	async carry(
 		input: PduObjectInput,
 		options: SendOptions,
 	): Promise<Result<{ pduObj: PduObject }>> {
@@ -125,8 +128,7 @@ export class OutgoingRequests {
 
 			const attempt = await this.attempt(input, options).finally(() => { this.window.release(); });
 
-			// Nothing reached the socket, so the next link carries it instead of the caller resending.
-			if (!attempt.retryOnNextLink || this.gate.isUp() || this.gate.refusal()) return attempt.result;
+			if (!this.retriesOnNextLink(attempt)) return attempt.result;
 		}
 	}
 
@@ -151,6 +153,12 @@ export class OutgoingRequests {
 		return { err: new Error(`Shut down with ${String(unfinished)} request(s) unfinished`) };
 	}
 
+	/** Nothing reached the socket, so the next link carries it instead of the caller resending. */
+	private retriesOnNextLink(attempt: Attempt): boolean {
+		// Until the gate is shut it admits the retry straight back onto the dead socket, and the loop spins.
+		return attempt.retryOnNextLink && this.gate.awaitsNextLink();
+	}
+
 	/** Why a request cannot go out at all, as opposed to not yet. */
 	private refuse(input: PduObjectInput, options: SendOptions): Error | undefined {
 		// Before the gate and the window, or an aborted call waits for what it will never use.

src/session.ts

@@ -261,7 +261,7 @@ export class Session extends EventEmitter<SessionEvents> {
 			reportError: err => { this.emit('sessionError', err); },
 			reportMessageDlr: merged => { this.emit('messageDlr', merged); },
 			send: input => this.send(input),
-			sendPastDrain: input => this.outgoing.pastDrain(input, {}),
+			sendPastDrain: input => this.outgoing.carry(input, {}),
 			smsListeners: () => this.listenerCount('sms'),
 		};
 	}