bazel-bsp server auto-update based on configured version (#30)

Add a version check during the server initialization process. When the
installed version does not match what is configured in VS Code settings
(`bazelbsp.serverVersion`), the installer will be run to get the
required version. This will ensure that a user's installed bazel-bsp
version stays in sync with the version expected by this extension.

Also update jdk version used by Coursier as newer versions of bazel-bsp
require Java 17+, to get this working. As a follow-up we can add in some
additional logic here to depend on system Java where its version is new
enough.

src/server/install.ts

@@ -166,7 +166,7 @@ export class BazelBSPInstaller {
       .join(' ')
 
     // Full install command including flags.
-    const installCommand = `"${coursierPath}" launch --jvm 11+ ${MAVEN_PACKAGE}:${config.serverVersion} -M ${INSTALL_METHOD} -- ${flagsString}`
+    const installCommand = `"${coursierPath}" launch --jvm openjdk:1.17.0 ${MAVEN_PACKAGE}:${config.serverVersion} -M ${INSTALL_METHOD} -- ${flagsString}`
 
     // Report progress in output channel.
     const installProcess = cp.spawn(installCommand, {cwd: root, shell: true})

src/server/server-manager.ts

@@ -11,6 +11,7 @@ import {ConnectionDetailsParser} from './connection-details'
 import {Utils} from '../utils/utils'
 import {INSTALL_BSP_COMMAND} from './install'
 import {BspConnectionDetails} from '../bsp/bsp'
+import {getExtensionSetting, SettingName} from '../utils/settings'
 
 export const CANCEL_ERROR_CODE = -32603
 const SERVER_NAME = 'bazelbsp'
@@ -96,8 +97,10 @@ export class BuildServerManager implements vscode.Disposable, OnModuleInit {
         SERVER_NAME,
         rootDir
       )
-
-    if (connDetails) {
+    const configuredVersion = getExtensionSetting(
+      SettingName.BSP_SERVER_VERSION
+    )
+    if (connDetails && connDetails?.version === configuredVersion) {
       return connDetails
     }
 

src/test/suite/install.test.ts

@@ -87,7 +87,7 @@ suite('BSP Installer', () => {
 
     // Just confirm that coursier path was part of the spawn call, to leave flexibility for other changes to the command.
     assert.ok(spawnStub.getCalls()[0].args[0].includes(coursierPath))
-    assert.ok(spawnStub.getCalls()[0].args[0].includes('--jvm 11+'))
+    assert.ok(spawnStub.getCalls()[0].args[0].includes('--jvm openjdk:1.17.0'))
     assert.ok(installResult)
   })
 

src/test/suite/server-manager.test.ts

@@ -16,6 +16,7 @@ import {createSampleMessageConnection} from './test-utils'
 import {ConnectionDetailsParser} from '../../server/connection-details'
 import {Utils} from '../../utils/utils'
 import {BspConnectionDetails} from '../../bsp/bsp'
+import * as settings from '../../utils/settings'
 
 suite('Build Server', () => {
   let ctx: vscode.ExtensionContext
@@ -80,6 +81,8 @@ suite('Build Server', () => {
   })
 
   test('OnModuleInit', async () => {
+    sandbox.stub(settings, 'getExtensionSetting').returns('1.0.0')
+
     buildServer.onModuleInit()
     assert.equal(ctx.subscriptions.length, 1)
     const conn = await buildServer.getConnection()
@@ -88,19 +91,42 @@ suite('Build Server', () => {
   })
 
   test('ServerLaunch', async () => {
+    sandbox.stub(settings, 'getExtensionSetting').returns('1.0.0')
+
+    const listenStub = sinon.stub(sampleConn, 'listen')
+
+    buildServer.serverLaunch()
+    const conn = await buildServer.getConnection()
+
+    await appendLinePromise
+    assert.ok(appendLineStub.calledOnce)
+    assert.ok(spawnStub.calledOnce)
+    assert.ok(listenStub.calledOnce)
+    assert.ok(conn)
+  })
+
+  test('ServerLaunch, version upgrade', async () => {
+    sandbox.stub(settings, 'getExtensionSetting').returns('1.0.1')
+    const commandStub = sandbox
+      .stub(vscode.commands, 'executeCommand')
+      .resolves(true)
+
     const listenStub = sinon.stub(sampleConn, 'listen')
 
     buildServer.serverLaunch()
     const conn = await buildServer.getConnection()
 
     await appendLinePromise
+    assert.ok(commandStub.calledOnceWith('bazelbsp.install'))
     assert.ok(appendLineStub.calledOnce)
     assert.ok(spawnStub.calledOnce)
     assert.ok(listenStub.calledOnce)
     assert.ok(conn)
   })
 
   test('Dispose', async () => {
+    sandbox.stub(settings, 'getExtensionSetting').returns('1.0.0')
+
     buildServer.serverLaunch()
     const conn = await buildServer.getConnection()