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/*! Copyright (c) 2023 Siemens AG. Licensed under the MIT License. */
Object.defineProperty(exports, "__esModule", { value: true });
exports.RoutingService = exports.RoutingPolicy = void 0;
const grpc_js_1 = require("@grpc/grpc-js");
const tn_base_service_1 = require("./tn-base-service");
var RoutingPolicy;
(function (RoutingPolicy) {
RoutingPolicy[RoutingPolicy["Single"] = 0] = "Single";
RoutingPolicy[RoutingPolicy["First"] = 1] = "First";
RoutingPolicy[RoutingPolicy["Last"] = 2] = "Last";
RoutingPolicy[RoutingPolicy["Next"] = 3] = "Next";
RoutingPolicy[RoutingPolicy["Random"] = 4] = "Random";
})(RoutingPolicy = exports.RoutingPolicy || (exports.RoutingPolicy = {}));
class RoutingService extends tn_base_service_1.TnBaseService {
constructor(debug) {
super(() => undefined, () => undefined, () => undefined, debug, "RoutingService");
this._registrationCallsOneWay = new Map();
this._registrationCallsTwoWay = new Map();
this._requestCalls = new Map();
}
get handlers() {
return {
registerPushRoute: (call) => this._handleRegister(call, false),
registerRequestRoute: (call) => this._handleRegister(call, true),
push: (call, cb) => this._handlePush(call, cb),
request: (call, cb) => this._handleRequest(call, cb),
respond: (call, cb) => this._handleResponse(call, cb),
};
}
_handleRegister(call, isTwoWayRoute) {
try {
this._registerCall(call, isTwoWayRoute);
}
catch (error) {
this.debug("%s", error.message);
call.emit("error", { code: grpc_js_1.status.INVALID_ARGUMENT, details: error.message });
return;
}
const onEndOrCancelledOrError = (...args) => {
const routeType = isTwoWayRoute ? "two-way" : "one-way";
Iif (args[0] instanceof Error) {
this.debug("Error on registration call for %s route %o: %s", routeType, call.request.route, args[0].message);
}
else {
this.debug("Registration call cancelled or ended for %s route %o", routeType, call.request.route);
}
this._deregisterCall(call, isTwoWayRoute);
};
call.once("end", onEndOrCancelledOrError)
.once("cancelled", onEndOrCancelledOrError)
.once("error", onEndOrCancelledOrError);
}
_handlePush(call, callback) {
const pushEvent = call.request;
const items = this._registrationCallsOneWay.get(pushEvent.route);
if (items) {
for (const item of items) {
item.write(pushEvent);
}
}
callback(null, { routingCount: items ? items.length : 0 });
}
_handleRequest(call, callback) {
const requestEvent = call.request;
const items = this._registrationCallsTwoWay.get(requestEvent.route);
if (items) {
const registrationCall = items.selector(items.calls);
const requestId = items.requestId = this._nextRequestId(items.requestId);
this._addRequestCall(requestEvent.route, requestId, [call, callback, registrationCall]);
registrationCall.write({ ...requestEvent, requestId });
}
else {
this.debug("No registration available for request event on route %o", requestEvent.route);
callback({ code: grpc_js_1.status.UNAVAILABLE, details: "No registration available for request event" });
}
}
_handleResponse(call, callback) {
const response = call.request;
const requestCallItem = this._removeRequestCall(response.route, response.requestId);
if (!requestCallItem) {
this.debug("Response event discarded as it is not correlated with a pending request: %o", response);
callback({
code: grpc_js_1.status.INVALID_ARGUMENT,
details: "Response event discarded as no correlated registration exits",
});
return;
}
const [requestCall, requestCb] = requestCallItem;
if (requestCall.cancelled) {
this.debug("Response event discarded as request call already cancelled or deadline exceeded: %o", response);
callback(null, { routingCount: 0 });
return;
}
delete response.requestId;
requestCb(null, response);
callback(null, { routingCount: 1 });
}
_nextRequestId(requestId) {
return (requestId < 0xFFFFFFFF) ? requestId + 1 : 1;
}
_routingPolicySelector(policy) {
let currentCallIndex = 0;
switch (policy) {
case RoutingPolicy.Single:
case RoutingPolicy.First:
return calls => calls[0];
case RoutingPolicy.Last:
return calls => calls[calls.length - 1];
case RoutingPolicy.Random:
return calls => calls[Math.floor(Math.random() * calls.length)];
case RoutingPolicy.Next:
return calls => {
const next = calls[currentCallIndex];
currentCallIndex = currentCallIndex < calls.length - 1 ? currentCallIndex + 1 : 0;
return next;
};
}
}
_registerCall(call, isTwoWayRoute) {
if (isTwoWayRoute) {
const route = call.request;
let items = this._registrationCallsTwoWay.get(route.route);
if (!items) {
items = {
calls: [],
requestId: 0,
policy: route.routingPolicy,
selector: this._routingPolicySelector(route.routingPolicy),
};
this._registrationCallsTwoWay.set(route.route, items);
}
if (items.policy === RoutingPolicy.Single && items.calls.length > 0) {
throw new Error(`Registration error on two-way route ${route.route}: additional registrations not allowed with default policy`);
}
if (items.policy !== RoutingPolicy.Single && items.policy !== route.routingPolicy) {
throw new Error(`Registration error on two-way route ${route.route}: additional registration with different policy not accepted`);
}
items.calls.push(call);
Iif (this.debug.enabled) {
this.debug("Registered two-way route %o", route);
}
}
else {
const route = call.request;
let calls = this._registrationCallsOneWay.get(route.route);
if (!calls) {
calls = [];
this._registrationCallsOneWay.set(route.route, calls);
}
calls.push(call);
Iif (this.debug.enabled) {
this.debug("Registered one-way route %o", route);
}
}
}
_deregisterCall(call, isTwoWayRoute) {
if (isTwoWayRoute) {
const route = call.request;
const items = this._registrationCallsTwoWay.get(route.route);
Iif (!items) {
return;
}
const i = items.calls.findIndex(item => item === call);
Eif (i !== -1) {
items.calls.splice(i, 1);
if (items.calls.length === 0) {
this._registrationCallsTwoWay.delete(route.route);
}
this._cancelRequestCalls(call);
Iif (this.debug.enabled) {
this.debug("Deregistered two-way route %o", route);
}
}
}
else {
const route = call.request;
const items = this._registrationCallsOneWay.get(route.route) || [];
const i = items.findIndex(item => item === call);
Eif (i !== -1) {
items.splice(i, 1);
if (items.length === 0) {
this._registrationCallsOneWay.delete(route.route);
}
Iif (this.debug.enabled) {
this.debug("Deregistered one-way route %o", route);
}
}
}
}
_addRequestCall(route, requestId, item) {
let requestItems = this._requestCalls.get(route);
if (!requestItems) {
requestItems = new Map();
this._requestCalls.set(route, requestItems);
}
requestItems.set(requestId, item);
}
_removeRequestCall(route, requestId) {
const items = this._requestCalls.get(route);
if (!items) {
return undefined;
}
const item = items.get(requestId);
items.delete(requestId);
if (items.size === 0) {
this._requestCalls.delete(route);
}
return item;
}
_cancelRequestCalls(call) {
const route = call.request.route;
const items = this._requestCalls.get(route);
if (!items) {
return;
}
for (const [requestId, [requestCall, requestCb, registrationCall]] of items) {
Eif (registrationCall === call) {
items.delete(requestId);
Eif (items.size === 0) {
this._requestCalls.delete(route);
}
Eif (!requestCall.cancelled) {
this.debug("Registration on two-way route %o deregistered before response, cancelling request call", route);
requestCb({
code: grpc_js_1.status.CANCELLED,
details: "Correlated registration deregistered before response",
});
}
}
}
}
}
exports.RoutingService = RoutingService;
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