[lsp] LSP-196: Fix conflicts accessing database

- Use the workspace storage path provided by the client
- Use FS locks to prevent multiple servers connecting to the same database


Merge-request: IJ-MR-171453
Merged-by: Pavel Mikhailovskii <Pavel.Mikhailovskii@jetbrains.com>

GitOrigin-RevId: 18a72d1d5ca4c3f0514d002d0fbbd0bc11cccc9c

Author: strangepleasures

kotlin-lsp/src/com/jetbrains/ls/kotlinLsp/KotlinLspServer.kt

@@ -32,6 +32,7 @@ import org.jetbrains.kotlin.idea.compiler.configuration.KotlinPluginLayoutMode
 import org.jetbrains.kotlin.idea.compiler.configuration.KotlinPluginLayoutModeProvider
 import org.jetbrains.kotlin.idea.compiler.configuration.isRunningFromSources
 import java.awt.Toolkit
+import java.io.RandomAccessFile
 import java.lang.invoke.MethodHandles
 import java.net.URLDecoder
 import java.nio.file.Path
@@ -125,7 +126,23 @@ private fun initIdeaPaths(systemPath: Path?) {
                     "fleet" / "native" / "target" / "download" / "filewatcher")
     }
     else {
-        val path = systemPath?.createDirectories() ?: createTempDirectory("idea-system")
+        val path = systemPath
+            ?.createDirectories()
+            ?.takeIf {
+                val lockFile = (it / ".app.lock").toFile()
+                val channel = RandomAccessFile(lockFile, "rw").channel
+                val isLockAcquired = channel.tryLock() != null
+                if (!isLockAcquired) {
+                    LOG.info("The specified workspace data path is already in use: $it")
+                    channel.close()
+                }
+                isLockAcquired
+            }
+            ?: createTempDirectory("idea-system").also {
+                @Suppress("SSBasedInspection")
+                it.toFile().deleteOnExit()
+            }
+
         systemProperty("idea.home.path", "$path")
         systemProperty("idea.config.path", "$path/config", ifAbsent = true)
         systemProperty("idea.system.path", "$path/system", ifAbsent = true)

kotlin-vscode/src/lspClient.ts

@@ -184,13 +184,14 @@ async function getRunningJavaServerLspOptions(): Promise<ServerOptions | null> {
 
     const extractPath = getContext().asAbsolutePath(path.join('server', 'extracted', 'lib'));
 
+    const context = getContext()
     const args: string[] = []
     args.push(...defaultJvmOptions)
     args.push(...getUserJvmOptions())
     args.push(
         '-classpath', extractPath + path.sep + '*',
         'com.jetbrains.ls.kotlinLsp.KotlinLspServerKt', '--client',
-        '--system-path', getContext().globalStorageUri.fsPath,
+        '--system-path', (context.storageUri ?? context.globalStorageUri).fsPath,
     );
     return <ServerOptions>{
         command: javaCommand,