65 lines
1.4 KiB
JavaScript
65 lines
1.4 KiB
JavaScript
//
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// Copyright 2020 DxOS.org
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//
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import { spawnSync } from 'child_process';
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class LogCache {
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constructor (maxLines = 500) {
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// Sets in JS iterate in insertion order.
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this.buffer = new Set();
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this.maxLines = maxLines;
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}
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append (lines) {
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const added = [];
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for (const line of lines) {
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if (!this.buffer.has(line)) {
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this.buffer.add(line);
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added.push(line);
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}
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}
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if (this.buffer.size > this.maxLines) {
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this.buffer = new Set(Array.from(this.buffer).slice(parseInt(this.maxLines / 2)));
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}
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return added;
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}
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}
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const _caches = new Map();
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const getLogCache = (name) => {
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let cache = _caches.get(name);
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if (!cache) {
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cache = new LogCache();
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_caches.set(name, cache);
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}
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return cache;
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};
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const getLogs = async (name, incremental = false, lines = 100) => {
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const command = 'wire';
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const args = ['service', 'logs', '--lines', lines, name];
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const child = spawnSync(command, args, { encoding: 'utf8' });
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const logLines = child.stdout.split(/\n/);
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const cache = getLogCache(name);
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const added = cache.append(logLines);
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return incremental ? added : Array.from(cache.buffer);
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};
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export const logResolvers = {
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Query: {
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logs: async (_, { service, incremental }) => {
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const lines = await getLogs(service, incremental);
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return {
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timestamp: new Date().toUTCString(),
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json: JSON.stringify({ incremental, lines })
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};
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}
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}
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};
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