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const cmn = require("../$common.js");
const fs = require("fs");
const https = require("https");
const child_process = require("child_process");
const generateTemplate = require("./template.js");
let moddir = null;
let repodir = null;
const repoRemote = "https://git.tomsmeding.com/blog";
let templateCache = new Map();
function fetch(url) {
return new Promise((resolve, reject) => {
https.get(url, res => {
if (res.statusCode != 200) {
reject(`HTTP status code ${res.statusCode}`);
return;
}
let buffers = [];
res.on("data", d => buffers.push(d));
res.on("end", () => {
resolve(Buffer.concat(buffers));
});
}).on("error", err => {
reject(err);
});
});
}
function runCommand(cmd, args) {
console.log(`blog: ${cmd} ${JSON.stringify(args)}`);
child_process.execFileSync(
cmd, args,
{ stdio: "inherit", timeout: 20000 }
);
}
function runCommandOutput(cmd, args) {
return child_process.execFileSync(
cmd, args,
{ timeout: 20000 }
);
}
function ensureRepo() {
try {
const stats = fs.statSync(repodir);
if (stats.isDirectory()) return;
} catch (e) {}
runCommand("git", ["clone", "https://git.tomsmeding.com/blog", repodir]);
}
function currentCommit() {
return runCommandOutput("git", ["-C", repodir, "rev-parse", "HEAD"]).toString().trim();
}
async function upstreamCommit() {
const body = await fetch(repoRemote + "/info/refs");
return body.toString().split("\t")[0];
}
function updateRepo() {
try {
runCommand("git", ["-C", repodir, "fetch", "--all"]);
runCommand("git", ["-C", repodir, "reset", "origin/master", "--hard"]);
// Reset cache _after_ the commands succeeded; if anything failed, we
// might at least still have stale cache data
templateCache = new Map();
} catch (e) {
console.error("Cannot update blog git repo!");
console.error(e);
}
}
async function periodicUpdateCheck() {
let shouldUpdate = false;
try {
const local = currentCommit();
const remote = await upstreamCommit();
if (local != remote) shouldUpdate = true;
} catch (e) {
// Also update if our pre-check fails for some reason
shouldUpdate = true;
}
if (shouldUpdate) updateRepo();
}
setInterval(function () {
periodicUpdateCheck().catch(err => console.error(err));
}, 3600 * 1000);
module.exports = (app, io, _moddir) => {
moddir = _moddir;
repodir = moddir + "/repo";
ensureRepo();
updateRepo();
app.get("/blog", (req, res, next) => {
req.url = "/blog/";
next();
});
app.get("/blog/*", (req, res) => {
if (req.path.indexOf("/.") != -1) {
res.sendStatus(404);
return;
}
const path = req.path.slice(6).replace(/\.html$/, "");
if (templateCache.has(path)) {
res.send(templateCache.get(path));
} else {
generateTemplate(repodir, path ? path + ".html" : undefined)
.then(rendered => {
// TODO: fix rendering race condition
templateCache.set(path, rendered);
res.send(rendered);
})
.catch(err => {
if (err.code && err.code == "ENOENT") {
res.sendStatus(404);
} else {
console.error(err);
res.sendStatus(500);
}
});
}
});
};
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