@yosefsolutions/feathers-redis-cache
Version:
Redis cache for feathers service
253 lines • 11.9 kB
JavaScript
;
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var moment_1 = __importDefault(require("moment/moment"));
var chalk_1 = __importDefault(require("chalk"));
var qs_1 = __importDefault(require("qs"));
var async_1 = __importDefault(require("async"));
var _a = process.env, DISABLE_REDIS_CACHE = _a.DISABLE_REDIS_CACHE, ENABLE_REDIS_CACHE_LOGGER = _a.ENABLE_REDIS_CACHE_LOGGER;
var HTTP_OK = 200;
var HTTP_SERVER_ERROR = 500;
var defaults = {
defaultExpiration: 3600 * 24,
};
function hashCode(s) {
var h;
for (var i = 0; i < s.length; i++) {
h = Math.imul(31, h) + s.charCodeAt(i) | 0;
}
return String(h);
}
exports.hashCode = hashCode;
function cacheKey(hook) {
var q = hook.params.query || {};
var p = hook.params.paginate === false ? 'disabled' : 'enabled';
var path = "pagination-hook:" + p + "::" + hook.path;
if (hook.id) {
path += "/" + hook.id;
}
if (Object.keys(q).length > 0) {
path += "?" + qs_1.default.stringify(JSON.parse(JSON.stringify(q)), { encode: false });
}
return "" + hashCode(hook.path) + hashCode(path);
}
function purgeGroup(client, group, prefix) {
if (prefix === void 0) { prefix = 'frc_'; }
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
return [2, new Promise(function (resolve, reject) {
var cursor = '0';
function scan() {
client.scan(cursor, 'MATCH', "" + prefix + group + "*", 'COUNT', '1000', function (err, reply) {
if (err)
return reject(err);
if (!Array.isArray(reply[1]) || !reply[1][0])
return resolve();
cursor = reply[0];
var keys = reply[1];
var batchKeys = keys.reduce(function (a, c) {
if (Array.isArray(a[a.length - 1]) && a[a.length - 1].length < 100) {
a[a.length - 1].push(c.replace(prefix, ''));
}
else if (!Array.isArray(a[a.length - 1]) || a[a.length - 1].length >= 100) {
a.push([c.replace(prefix, '')]);
}
return a;
}, []);
async_1.default.eachOfLimit(batchKeys, 10, function (batch, idx, cb) {
if (client.unlink) {
client.unlink(batch, cb);
}
else {
client.del(batch, cb);
}
}, function (err) {
if (err)
return reject(err);
return scan();
});
});
}
return scan();
})];
});
});
}
exports.purgeGroup = purgeGroup;
exports.default = {
before: function (passedOptions) {
if (passedOptions === void 0) { passedOptions = {}; }
if (DISABLE_REDIS_CACHE) {
return function (hook) { return hook; };
}
return function (hook) {
try {
if (hook && hook.params && hook.params.$skipCacheHook) {
return Promise.resolve(hook);
}
return new Promise(function (resolve) {
var client = hook.app.get('redisClient');
var options = __assign({}, defaults, passedOptions);
if (!client) {
return resolve(hook);
}
var group = typeof options.cacheGroupKey === 'function' ?
hashCode("group-" + options.cacheGroupKey(hook)) :
hashCode("group-" + (hook.path || 'general'));
var path = typeof options.cacheKey === 'function' ?
"" + group + options.cacheKey(hook) :
"" + group + cacheKey(hook);
hook.params.cacheKey = path;
client.get(path, function (err, reply) {
if (err) {
return resolve(hook);
}
if (reply) {
var data = JSON.parse(reply);
if (!data || !data.expiresOn || !data.cache) {
return resolve(hook);
}
var duration = moment_1.default(data.expiresOn).format('DD MMMM YYYY - HH:mm:ss');
hook.result = data.cache;
hook.params.$skipCacheHook = true;
if (options.env !== 'test' && ENABLE_REDIS_CACHE_LOGGER === 'true') {
console.log(chalk_1.default.cyan('[redis]') + " returning cached value for " + chalk_1.default.green(path) + ".");
console.log("> Expires on " + duration + ".");
}
return resolve(hook);
}
return resolve(hook);
});
});
}
catch (err) {
console.error(err);
return Promise.resolve(hook);
}
};
},
after: function (passedOptions) {
if (passedOptions === void 0) { passedOptions = {}; }
if (DISABLE_REDIS_CACHE) {
return function (hook) { return hook; };
}
return function (hook) {
try {
if (hook
&& hook.params
&& hook.params.$skipCacheHook) {
return Promise.resolve(hook);
}
if (!hook.result) {
return Promise.resolve(hook);
}
return new Promise(function (resolve) {
var client = hook.app.get('redisClient');
var options = __assign({}, defaults, passedOptions);
var duration = options.expiration || options.defaultExpiration;
var cacheKey = hook.params.cacheKey;
if (!client) {
return resolve(hook);
}
client.set(cacheKey, JSON.stringify({
cache: hook.result,
expiresOn: moment_1.default().add(moment_1.default.duration(duration, 'seconds')),
}));
client.expire(cacheKey, duration);
if (options.env !== 'test' && ENABLE_REDIS_CACHE_LOGGER === 'true') {
console.log(chalk_1.default.cyan('[redis]') + " added " + chalk_1.default.green(cacheKey) + " to the cache.");
console.log("> Expires in " + moment_1.default.duration(duration, 'seconds').humanize() + ".");
}
resolve(hook);
});
}
catch (err) {
console.error(err);
return Promise.resolve(hook);
}
};
},
purge: function (passedOptions) {
if (passedOptions === void 0) { passedOptions = {}; }
if (DISABLE_REDIS_CACHE) {
return function (hook) { return hook; };
}
return function (hook) {
try {
return new Promise(function (resolve) {
var client = hook.app.get('redisClient');
var options = __assign({}, defaults, passedOptions);
var prefix = hook.app.get('redis').prefix;
var group = typeof options.cacheGroupKey === 'function' ?
hashCode("group-" + options.cacheGroupKey(hook)) :
hashCode("group-" + (hook.path || 'general'));
if (!client) {
return {
message: 'Redis unavailable',
status: HTTP_SERVER_ERROR,
};
}
purgeGroup(client, group, prefix)
.catch(function (err) { return console.error({
message: err.message,
status: HTTP_SERVER_ERROR,
}); });
resolve(hook);
});
}
catch (err) {
console.error(err);
return Promise.resolve(hook);
}
};
},
};
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