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import fetch from "node-fetch";
import * as vscode from "vscode";
import * as stream from "stream";
import * as fs from "fs";
import * as os from "os";
import * as path from "path";
import * as util from "util";
import { log, assert } from "./util";
const pipeline = util.promisify(stream.pipeline);
const GITHUB_API_ENDPOINT_URL = "https://api.github.com";
const OWNER = "rust-analyzer";
const REPO = "rust-analyzer";
export async function fetchRelease(
releaseTag: string
): Promise<GithubRelease> {
const apiEndpointPath = `/repos/${OWNER}/${REPO}/releases/tags/${releaseTag}`;
const requestUrl = GITHUB_API_ENDPOINT_URL + apiEndpointPath;
log.debug("Issuing request for released artifacts metadata to", requestUrl);
const response = await fetch(requestUrl, { headers: { Accept: "application/vnd.github.v3+json" } });
if (!response.ok) {
log.error("Error fetching artifact release info", {
requestUrl,
releaseTag,
response: {
headers: response.headers,
status: response.status,
body: await response.text(),
}
});
throw new Error(
`Got response ${response.status} when trying to fetch ` +
`release info for ${releaseTag} release`
);
}
// We skip runtime type checks for simplicity (here we cast from `any` to `GithubRelease`)
const release: GithubRelease = await response.json();
return release;
}
// We omit declaration of tremendous amount of fields that we are not using here
export interface GithubRelease {
name: string;
id: number;
// eslint-disable-next-line camelcase
published_at: string;
assets: Array<{
name: string;
// eslint-disable-next-line camelcase
browser_download_url: string;
}>;
}
export async function download(
downloadUrl: string,
destinationPath: string,
progressTitle: string,
{ mode }: { mode?: number } = {},
) {
await vscode.window.withProgress(
{
location: vscode.ProgressLocation.Notification,
cancellable: false,
title: progressTitle
},
async (progress, _cancellationToken) => {
let lastPercentage = 0;
await downloadFile(downloadUrl, destinationPath, mode, (readBytes, totalBytes) => {
const newPercentage = (readBytes / totalBytes) * 100;
progress.report({
message: newPercentage.toFixed(0) + "%",
increment: newPercentage - lastPercentage
});
lastPercentage = newPercentage;
});
}
);
}
/**
* Downloads file from `url` and stores it at `destFilePath` with `mode` (unix permissions).
* `onProgress` callback is called on recieveing each chunk of bytes
* to track the progress of downloading, it gets the already read and total
* amount of bytes to read as its parameters.
*/
async function downloadFile(
url: string,
destFilePath: fs.PathLike,
mode: number | undefined,
onProgress: (readBytes: number, totalBytes: number) => void
): Promise<void> {
const res = await fetch(url);
if (!res.ok) {
log.error("Error", res.status, "while downloading file from", url);
log.error({ body: await res.text(), headers: res.headers });
throw new Error(`Got response ${res.status} when trying to download a file.`);
}
const totalBytes = Number(res.headers.get('content-length'));
assert(!Number.isNaN(totalBytes), "Sanity check of content-length protocol");
log.debug("Downloading file of", totalBytes, "bytes size from", url, "to", destFilePath);
let readBytes = 0;
res.body.on("data", (chunk: Buffer) => {
readBytes += chunk.length;
onProgress(readBytes, totalBytes);
});
// Put the artifact into a temporary folder to prevent partially downloaded files when user kills vscode
await withTempFile(async tempFilePath => {
const destFileStream = fs.createWriteStream(tempFilePath, { mode });
await pipeline(res.body, destFileStream);
await new Promise<void>(resolve => {
destFileStream.on("close", resolve);
destFileStream.destroy();
// This workaround is awaiting to be removed when vscode moves to newer nodejs version:
// https://github.com/rust-analyzer/rust-analyzer/issues/3167
});
await moveFile(tempFilePath, destFilePath);
});
}
async function withTempFile(scope: (tempFilePath: string) => Promise<void>) {
// Based on the great article: https://advancedweb.hu/secure-tempfiles-in-nodejs-without-dependencies/
// `.realpath()` should handle the cases where os.tmpdir() contains symlinks
const osTempDir = await fs.promises.realpath(os.tmpdir());
const tempDir = await fs.promises.mkdtemp(path.join(osTempDir, "rust-analyzer"));
try {
return await scope(path.join(tempDir, "file"));
} finally {
// We are good citizens :D
void fs.promises.rmdir(tempDir, { recursive: true }).catch(log.error);
}
};
async function moveFile(src: fs.PathLike, dest: fs.PathLike) {
try {
await fs.promises.rename(src, dest);
} catch (err) {
if (err.code === 'EXDEV') {
// We are probably moving the file across partitions/devices
await fs.promises.copyFile(src, dest);
await fs.promises.unlink(src);
} else {
log.error(`Failed to rename the file ${src} -> ${dest}`, err);
}
}
}
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