@kurrent/kurrentdb-client
Version:
KurrentDB gRPC NodeJS Client SDK
71 lines • 2.43 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Subscription = void 0;
const stream_1 = require("stream");
const utils_1 = require("../../utils");
class Subscription extends stream_1.Transform {
convertGrpcEvent;
#grpcStream;
#checkpointReached;
id;
constructor(createGRPCStream, convertGrpcEvent, options, checkpointReached) {
super({ ...options, objectMode: true });
this.convertGrpcEvent = convertGrpcEvent;
this.#grpcStream = createGRPCStream();
this.#checkpointReached = checkpointReached;
this.initialize();
}
initialize = async () => {
try {
(await this.#grpcStream)
.on("error", (err) => {
if ((0, utils_1.isClientCancellationError)(err))
return;
const error = (0, utils_1.convertToCommandError)(err);
this.emit("error", error);
})
.pipe(this);
}
catch (error) {
this.emit("error", error);
}
};
async _transform(resp, _encoding, next) {
if (resp.hasConfirmation?.()) {
this.id = resp.getConfirmation()?.getSubscriptionId();
this.emit("confirmation");
}
if (resp.hasCaughtUp?.()) {
this.emit("caughtUp");
}
if (resp.hasFellBehind?.()) {
this.emit("fellBehind");
}
if (resp.hasCheckpoint?.() && this.#checkpointReached) {
const checkpoint = resp.getCheckpoint();
const position = {
commit: BigInt(checkpoint.getCommitPosition()),
prepare: BigInt(checkpoint.getPreparePosition()),
};
await this.#checkpointReached(this, position);
}
if (resp.hasEvent?.()) {
const resolved = this.convertGrpcEvent(resp.getEvent());
return next(null, resolved);
}
next();
}
async unsubscribe() {
const stream = await this.#grpcStream;
return new Promise((resolve) => {
// https://github.com/grpc/grpc-node/issues/1464
// https://github.com/grpc/grpc-node/issues/1652
setImmediate(() => {
stream.cancel();
resolve();
});
});
}
}
exports.Subscription = Subscription;
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