pipeproc/lib/node/commitLog.js

Multi-process log processing for nodejs

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const debug_1 = __importDefault(require("debug"));
const transaction_1 = require("./transaction");
const tones_1 = require("./tones");
const d = debug_1.default("pipeproc:node");
function commitLog(db, activeTopics, log, callback) {
    d("new log(s):\n%O", log);
    const tx = transaction_1.transaction(db);
    const creationTime = Date.now();
    if (Array.isArray(log)) {
        log.forEach(l => tx.add(preCommit(db, activeTopics, l, creationTime)));
    }
    else {
        tx.add(preCommit(db, activeTopics, log, creationTime));
    }
    tx.commitUpdate(function (err, commit) {
        if (err) {
            callback(err);
        }
        else if (typeof commit === "string" || (Array.isArray(commit) && commit.length > 0)) {
            callback(null, commit);
        }
        else {
            callback();
        }
    });
}
exports.commitLog = commitLog;
function preCommit(db, activeTopics, log, creationTime) {
    const tx = transaction_1.transaction(db);
    if (!activeTopics[log.topic]) {
        activeTopics[log.topic] = {
            createdAt: creationTime,
            currentTone: tones_1.ZERO_TONE
        };
        tx.add([
            { key: `~~system~~#activeTopics#${log.topic}`, value: `${creationTime}` },
            { key: `~~system~~#currentTone#${log.topic}`, value: tones_1.ZERO_TONE }
        ]);
    }
    const nextTone = tones_1.incrementCurrentTone(activeTopics[log.topic].currentTone);
    const id = `${creationTime}-${nextTone}`;
    const key = `topic#${log.topic}#key#${id}`;
    const idKey = `~~internal~~#topic#${log.topic}#idKey#${nextTone}`;
    tx.add([{
            key: key,
            value: log.body
        }, {
            key: idKey,
            value: key
        }, {
            key: `~~system~~#currentTone#${log.topic}`,
            value: nextTone
        }]);
    activeTopics[log.topic].currentTone = nextTone;
    tx.done(function () {
        return id;
    }, "commits");
    return tx;
}
exports.preCommit = preCommit;