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import * as vscode from "vscode";
import * as path from "path";
import { strict as assert } from "assert";
import { promises as dns } from "dns";
import { spawnSync } from "child_process";
import { BinarySource } from "./interfaces";
import { fetchArtifactReleaseInfo } from "./fetch_artifact_release_info";
import { downloadArtifact } from "./download_artifact";
import { log } from "../util";
export async function ensureServerBinary(source: null | BinarySource): Promise<null | string> {
if (!source) {
vscode.window.showErrorMessage(
"Unfortunately we don't ship binaries for your platform yet. " +
"You need to manually clone rust-analyzer repository and " +
"run `cargo xtask install --server` to build the language server from sources. " +
"If you feel that your platform should be supported, please create an issue " +
"about that [here](https://github.com/rust-analyzer/rust-analyzer/issues) and we " +
"will consider it."
);
return null;
}
switch (source.type) {
case BinarySource.Type.ExplicitPath: {
if (isBinaryAvailable(source.path)) {
return source.path;
}
vscode.window.showErrorMessage(
`Unable to run ${source.path} binary. ` +
`To use the pre-built language server, set "rust-analyzer.serverPath" ` +
"value to `null` or remove it from the settings to use it by default."
);
return null;
}
case BinarySource.Type.GithubRelease: {
const prebuiltBinaryPath = path.join(source.dir, source.file);
const installedVersion: null | string = getServerVersion(source.storage);
const requiredVersion: string = source.version;
log.debug("Installed version:", installedVersion, "required:", requiredVersion);
if (isBinaryAvailable(prebuiltBinaryPath) && installedVersion === requiredVersion) {
return prebuiltBinaryPath;
}
const userResponse = await vscode.window.showInformationMessage(
`Language server version ${source.version} for rust-analyzer is not installed. ` +
"Do you want to download it now?",
"Download now", "Cancel"
);
if (userResponse !== "Download now") return null;
if (!await downloadServer(source)) return null;
return prebuiltBinaryPath;
}
}
}
async function downloadServer(source: BinarySource.GithubRelease): Promise<boolean> {
try {
const releaseInfo = (await fetchArtifactReleaseInfo(source.repo, source.file, source.version))!;
await downloadArtifact(releaseInfo, source.file, source.dir, "language server");
await setServerVersion(source.storage, releaseInfo.releaseName);
} catch (err) {
vscode.window.showErrorMessage(
`Failed to download language server from ${source.repo.name} ` +
`GitHub repository: ${err.message}`
);
log.error(err);
dns.resolve('example.com').then(
addrs => log.debug("DNS resolution for example.com was successful", addrs),
err => {
log.error(
"DNS resolution for example.com failed, " +
"there might be an issue with Internet availability"
);
log.error(err);
}
);
return false;
}
if (!isBinaryAvailable(path.join(source.dir, source.file))) assert(false,
`Downloaded language server binary is not functional.` +
`Downloaded from: ${JSON.stringify(source, null, 4)}`
);
vscode.window.showInformationMessage(
"Rust analyzer language server was successfully installed 🦀"
);
return true;
}
function isBinaryAvailable(binaryPath: string): boolean {
const res = spawnSync(binaryPath, ["--version"]);
// ACHTUNG! `res` type declaration is inherently wrong, see
// https://github.com/DefinitelyTyped/DefinitelyTyped/issues/42221
log.debug("Checked binary availablity via --version", res);
log.debug(binaryPath, "--version output:", res.output?.map(String));
return res.status === 0;
}
function getServerVersion(storage: vscode.Memento): null | string {
const version = storage.get<null | string>("server-version", null);
log.debug("Get server-version:", version);
return version;
}
async function setServerVersion(storage: vscode.Memento, version: string): Promise<void> {
log.debug("Set server-version:", version);
await storage.update("server-version", version.toString());
}
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