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feat: Propagate rejections up to the functions that caused them #401

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feat: Propagate rejections up to the functions that caused them #401

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42 changes: 31 additions & 11 deletions src/protocol/protocol.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -107,17 +107,37 @@ export class WireProtocol {
if (this.#isPendingResponse) return;
this.#isPendingResponse = true;
while (this.#pendingResponses.size > 0) {
const headerBuffer = await this.#reader.readFull(new Uint8Array(16));
if (!headerBuffer) throw new MongoDriverError("Invalid response header");
const header = parseHeader(headerBuffer);
const bodyBuffer = await this.#reader.readFull(
new Uint8Array(header.messageLength - 16),
);
if (!bodyBuffer) throw new MongoDriverError("Invalid response body");
const reply = deserializeMessage(header, bodyBuffer);
const pendingMessage = this.#pendingResponses.get(header.responseTo);
this.#pendingResponses.delete(header.responseTo);
pendingMessage?.resolve(reply);
try {
const headerBuffer = await this.#reader.readFull(new Uint8Array(16));
if (!headerBuffer) {
throw new MongoDriverError("Invalid response header");
}
const header = parseHeader(headerBuffer);
const pendingMessage = this.#pendingResponses.get(header.responseTo);
try {
const bodyBuffer = await this.#reader.readFull(
new Uint8Array(header.messageLength - 16),
);
if (!bodyBuffer) throw new MongoDriverError("Invalid response body");
const reply = deserializeMessage(header, bodyBuffer);
pendingMessage?.resolve(reply);
} catch (error) {
pendingMessage?.reject(error);
}
this.#pendingResponses.delete(header.responseTo);
} catch (error) {
// If an error occurred in the above block, we won't be able to know for
// sure which specific message triggered the error.
// Though since the state appears to be so broken that we can't even
// read the header anymore, it's likely that the connection has
// simply closed.
// We'll just reject all pending messages so that the user can
// handle these themselves.
for (const pendingMessage of this.#pendingResponses.values()) {
pendingMessage.reject(error);
}
this.#pendingResponses.clear();
}
}
this.#isPendingResponse = false;
}
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