Add try-catch blocks around web requests

src/goLanguageServer.ts

@@ -79,7 +79,8 @@ export async function registerLanguageFeatures(ctx: vscode.ExtensionContext) {
 
  // The user may not have the most up-to-date version of the language server.
  const tool = getTool(toolName);
- if (await shouldUpdateLanguageServer(tool, path)) {
+ const update = await shouldUpdateLanguageServer(tool, path);
+ if (update) {
  promptForUpdatingTool(toolName);
  }
 
@@ -481,7 +482,18 @@ function parsePseudoversionTimestamp(version: string): moment.Moment {
 
 async function goplsVersionTimestamp(importPath: string, version: semver.SemVer): Promise<moment.Moment> {
  const infoURL = `https://proxy.golang.org/${importPath}/@v/v${version.format()}.info`;
- const data = await WebRequest.json<any>(infoURL);
+ let data: any;
+ try {
+ data = await WebRequest.json<any>(infoURL, {
+ throwResponseError: true,
+ });
+ } catch (e) {
+ console.log(`Unable to determine gopls timestamp: ${e}`);
+ return null;
+ }
+ if (!data) {
+ return null;
+ }
  const time = moment(data['Time']);
  return time;
 }
@@ -491,8 +503,18 @@ async function latestGopls(tool: Tool): Promise<semver.SemVer> {
  // ask the proxy for the latest version, and if the user's version is older,
  // prompt them to update.
  const listURL = `https://proxy.golang.org/${tool.importPath}/@v/list`;
- const data = await WebRequest.json<string>(listURL);
-
+ let data: string;
+ try {
+ data = await WebRequest.json<string>(listURL, {
+ throwResponseError: true,
+ });
+ } catch (e) {
+ console.log(`Unable to determine latest gopls version: ${e}`);
+ return null;
+ }
+ if (!data) {
+ return null;
+ }
  // Coerce the versions into SemVers so that they can be sorted correctly.
  const versions = [];
  for (const version of data.trim().split('\n')) {