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/*
This file is part of TALER
(C) 2016 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* API to access the Taler crypto worker thread.
* @author Florian Dold
*/
import {PreCoin} from "./types";
import {Reserve} from "./types";
import {Denomination} from "./types";
import {Offer} from "./wallet";
import {CoinWithDenom} from "./wallet";
import {PayCoinInfo} from "./types";
interface RegistryEntry {
resolve: any;
reject: any;
workerIndex: number;
}
interface WorkerState {
/**
* The actual worker thread.
*/
w: Worker;
/**
* Are we currently running a task on this worker?
*/
busy: boolean;
}
interface WorkItem {
operation: string;
args: any[];
resolve: any;
reject: any;
}
/**
* Number of different priorities. Each priority p
* must be 0 <= p < NUM_PRIO.
*/
const NUM_PRIO = 5;
export class CryptoApi {
private nextRpcId: number = 1;
private rpcRegistry: {[n: number]: RegistryEntry} = {};
private workers: WorkerState[];
private workQueues: WorkItem[][];
/**
* Number of busy workers.
*/
private numBusy: number = 0;
/**
* Number if pending work items.
*/
private numWaiting: number = 0;
constructor() {
let handler = (msg: MessageEvent) => {
let id = msg.data.id;
if (typeof id !== "number") {
console.error("rpc id must be number");
return;
}
if (!this.rpcRegistry[id]) {
console.error(`RPC with id ${id} has no registry entry`);
return;
}
let {resolve, workerIndex} = this.rpcRegistry[id];
delete this.rpcRegistry[id];
let ws = this.workers[workerIndex];
ws.busy = false;
this.numBusy--;
resolve(msg.data.result);
// try to find more work for this worker
for (let i = 0; i < NUM_PRIO; i++) {
let q = this.workQueues[NUM_PRIO - i - 1];
if (q.length != 0) {
let work: WorkItem = q.shift()!;
let msg: any = {
operation: work.operation,
args: work.args,
id: this.registerRpcId(work.resolve, work.reject, workerIndex),
};
ws.w.postMessage(msg);
ws.busy = true;
this.numBusy++;
}
}
};
this.workers = new Array<WorkerState>((navigator as any)["hardwareConcurrency"] || 2);
for (let i = 0; i < this.workers.length; i++) {
let w = new Worker("/lib/wallet/cryptoWorker.js");
w.onmessage = handler;
this.workers[i] = {
w,
busy: false,
};
}
this.workQueues = [];
for (let i = 0; i < NUM_PRIO; i++) {
this.workQueues.push([]);
}
}
private registerRpcId(resolve: any, reject: any,
workerIndex: number): number {
let id = this.nextRpcId++;
this.rpcRegistry[id] = {resolve, reject, workerIndex};
return id;
}
private doRpc<T>(operation: string, priority: number,
...args: any[]): Promise<T> {
if (this.numBusy == this.workers.length) {
let q = this.workQueues[priority];
if (!q) {
throw Error("assertion failed");
}
return new Promise<T>((resolve, reject) => {
this.workQueues[priority].push({operation, args, resolve, reject});
});
}
for (let i = 0; i < this.workers.length; i++) {
let ws = this.workers[i];
if (ws.busy) {
continue;
}
return new Promise<T>((resolve, reject) => {
let msg: any = {
operation, args,
id: this.registerRpcId(resolve, reject, i),
};
ws.w.postMessage(msg);
ws.busy = true;
this.numBusy++;
});
}
throw Error("assertion failed");
}
createPreCoin(denom: Denomination, reserve: Reserve): Promise<PreCoin> {
return this.doRpc("createPreCoin", 1, denom, reserve);
}
hashRsaPub(rsaPub: string): Promise<string> {
return this.doRpc("hashRsaPub", 2, rsaPub);
}
isValidDenom(denom: Denomination,
masterPub: string): Promise<boolean> {
return this.doRpc("isValidDenom", 2, denom, masterPub);
}
signDeposit(offer: Offer,
cds: CoinWithDenom[]): Promise<PayCoinInfo> {
return this.doRpc("signDeposit", 3, offer, cds);
}
createEddsaKeypair(): Promise<{priv: string, pub: string}> {
return this.doRpc("createEddsaKeypair", 1);
}
rsaUnblind(sig: string, bk: string, pk: string): Promise<string> {
return this.doRpc("rsaUnblind", 4, sig, bk, pk);
}
}
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