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Cache mirror list #475

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merged 3 commits into from
Nov 18, 2025
Merged

Cache mirror list #475

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7d9b3b5
cache mirror list
Vexu Nov 14, 2025
a7e22b0
fetch mirrors lazily
Vexu Nov 15, 2025
2d3b371
cache result of getVersions
Vexu Nov 15, 2025
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46 changes: 32 additions & 14 deletions src/zigSetup.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -577,6 +577,37 @@ async function updateStatus(context: vscode.ExtensionContext): Promise<void> {
});
}

async function getMirrors(context: vscode.ExtensionContext): Promise<vscode.Uri[]> {
let cached = { timestamp: 0, mirrors: "" };
const key = "mirror-cache";

const cachedStr = context.globalState.get<string>(key);
if (cachedStr !== undefined) {
cached = JSON.parse(cachedStr) as typeof cached;
}

const millisecondsInDay = 24 * 60 * 60 * 1000;
if (new Date().getTime() - cached.timestamp > millisecondsInDay) {
try {
const response = await fetch("https://ziglang.org/download/community-mirrors.txt");
if (response.status !== 200) throw Error("invalid mirrors");
const mirrorList = await response.text();
cached = {
timestamp: new Date().getTime(),
mirrors: mirrorList,
};
context.globalState.update(key, JSON.stringify(cached));
} catch {
// Cannot fetch mirrors, rely on cache.
}
}

return cached.mirrors
.trim()
.split("\n")
.map((u) => vscode.Uri.parse(u));
}

export async function setupZig(context: vscode.ExtensionContext) {
{
// This check can be removed once enough time has passed so that most users switched to the new value
Expand Down Expand Up @@ -674,19 +705,6 @@ export async function setupZig(context: vscode.ExtensionContext) {
break;
}

let mirrors: vscode.Uri[] = [];
try {
const response = await fetch("https://ziglang.org/download/community-mirrors.txt");
if (response.status !== 200) throw Error("invalid mirrors");
const mirrorList = await response.text();
mirrors = mirrorList
.trim()
.split("\n")
.map((u) => vscode.Uri.parse(u));
} catch {
// Cannot fetch mirrors, attempt downloading from canonical source.
}

versionManagerConfig = {
context: context,
title: "Zig",
Expand All @@ -695,7 +713,7 @@ export async function setupZig(context: vscode.ExtensionContext) {
/** https://ziglang.org/download */
minisignKey: minisign.parseKey("RWSGOq2NVecA2UPNdBUZykf1CCb147pkmdtYxgb3Ti+JO/wCYvhbAb/U"),
versionArg: "version",
mirrorUrls: mirrors,
mirrorUrls: await getMirrors(context),
canonicalUrl: {
release: vscode.Uri.parse("https://ziglang.org/download"),
nightly: vscode.Uri.parse("https://ziglang.org/builds"),
Expand Down