pubsub-tool
Version:
Producer and Consumer Tool for every streaming component
155 lines (154 loc) • 7.02 kB
JavaScript
;
/**
* 專案名稱： PubSub Tool
* 部門代號： ML8100
* 檔案說明： Confluent Avro解析策略
* @CREATE Fri Nov 27 2020 上午7:58:03
* @author Steve Y Lin
* @contact Steve_Y_Lin@wistron.com #1342
* -----------------------------------------------------------------------------
* @NOTE
*/
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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) : adopt(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 };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ConfluentAvroStrategy = void 0;
var avro = require("avsc");
/**
* Confluent Avro解析策略
*/
var ConfluentAvroStrategy = /** @class */ (function () {
function ConfluentAvroStrategy() {
}
/**
* 進行Avro編碼
*
* @method private
* @param schema Avro Schema
* @param schemaId Schema ID
* @param obj 要進行編碼的資料
* @return 回傳編碼結果
*/
ConfluentAvroStrategy.prototype.encoded = function (schema, schemaId, obj) {
var buf;
var type = avro.Type.forSchema(schema);
if (typeof obj === 'string') {
buf = type.toBuffer(JSON.parse(obj));
}
else {
buf = type.toBuffer(obj);
}
var result = Buffer.alloc(buf.length + 5);
result.writeUInt8(0, 0);
result.writeUInt32BE(schemaId, 1);
buf.copy(result, 5);
return result;
};
/**
* 將JSON物件轉Avro
*
* @method public
* @param schemaRegistry Schema Registry
* @param topic Topic
* @param json JSON物件
* @return 回傳轉換後的Avro
*/
ConfluentAvroStrategy.prototype.toAvro = function (schemaRegistry, topic, json) {
return __awaiter(this, void 0, void 0, function () {
var schemaId, res, schema, results;
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, schemaRegistry.getLatestSchemaId(topic)];
case 1:
schemaId = _a.sent();
return [4 /*yield*/, schemaRegistry.getSchemaById(schemaId)];
case 2:
res = _a.sent();
schema = JSON.parse(res.schema);
results = [];
if (Array.isArray(json)) {
json.forEach(function (obj) {
var result = _this.encoded(schema, schemaId, obj);
results.push(result);
});
return [2 /*return*/, results];
}
else {
return [2 /*return*/, this.encoded(schema, schemaId, json)];
}
return [2 /*return*/];
}
});
});
};
/**
* 從Avro轉JSON物件
*
* @method public
* @param schema Avro Schema
* @param buffer Avro
* @return 回傳轉換後的JSON物件
*/
ConfluentAvroStrategy.prototype.toJson = function (schemaRegistry, buffer) {
return __awaiter(this, void 0, void 0, function () {
var schemaId, res, schema, type, error_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 4, , 5]);
if (!(buffer.readUInt8(0) === 0)) return [3 /*break*/, 2];
schemaId = buffer.readUInt32BE(1);
return [4 /*yield*/, schemaRegistry.getSchemaById(schemaId)];
case 1:
res = _a.sent();
schema = JSON.parse(res.schema);
type = avro.Type.forSchema(schema);
return [2 /*return*/, type.fromBuffer(buffer.slice(5))];
case 2: throw new Error("Not Avro Encoded Message: " + JSON.stringify(buffer));
case 3: return [3 /*break*/, 5];
case 4:
error_1 = _a.sent();
return [2 /*return*/, error_1];
case 5: return [2 /*return*/];
}
});
});
};
return ConfluentAvroStrategy;
}());
exports.ConfluentAvroStrategy = ConfluentAvroStrategy;