fix: ssh connection to a workspace is established only once (#76)

- right now ssh automatically connects to the workspace when a user
selects it from the main env. page. However, if the user manually
disconnects from the hamburger menu, the SSH is no longer automatically
established afterward.
- the reason for this behavior was that the connection request flag that
triggered the ssh connection behind the scenes was never reset. In order
to reset we have to know when a user hits the disconnect button.
- fortunately Toolbox provides two callbacks, one before establishing
the ssh connection and another one right after disconnect. Even though
we don't know the reason for disconnect it's still a good opportunity to
reset the request flag.

- resolves #38

Author: fioan89

Diff for: CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Fixed
+
+- SSH connection to a Workspace is no longer established only once 
+
 ### Changed
 
 - action buttons on the token input step were swapped to achieve better keyboard navigation 

Diff for: src/main/kotlin/com/coder/toolbox/CoderRemoteEnvironment.kt

@@ -9,6 +9,8 @@ import com.coder.toolbox.sdk.v2.models.WorkspaceAgent
 import com.coder.toolbox.util.withPath
 import com.coder.toolbox.views.Action
 import com.coder.toolbox.views.EnvironmentView
+import com.jetbrains.toolbox.api.remoteDev.AfterDisconnectHook
+import com.jetbrains.toolbox.api.remoteDev.BeforeConnectionHook
 import com.jetbrains.toolbox.api.remoteDev.DeleteEnvironmentConfirmationParams
 import com.jetbrains.toolbox.api.remoteDev.EnvironmentVisibilityState
 import com.jetbrains.toolbox.api.remoteDev.RemoteProviderEnvironment
@@ -35,7 +37,7 @@ class CoderRemoteEnvironment(
     private val client: CoderRestClient,
     private var workspace: Workspace,
     private var agent: WorkspaceAgent,
-) : RemoteProviderEnvironment("${workspace.name}.${agent.name}") {
+) : RemoteProviderEnvironment("${workspace.name}.${agent.name}"), BeforeConnectionHook, AfterDisconnectHook {
     private var wsRawStatus = WorkspaceAndAgentStatus.from(workspace, agent)
 
     override var name: String = "${workspace.name}.${agent.name}"
@@ -109,6 +111,21 @@ class CoderRemoteEnvironment(
         return actions
     }
 
+    override fun getBeforeConnectionHooks(): List<BeforeConnectionHook> = listOf(this)
+
+    override fun getAfterDisconnectHooks(): List<AfterDisconnectHook> = listOf(this)
+
+    override fun beforeConnection() {
+        context.logger.info("Connecting to $id...")
+        this.isConnected = true
+    }
+
+    override fun afterDisconnect() {
+        this.connectionRequest.update { false }
+        this.isConnected = false
+        context.logger.info("Disconnected from $id")
+    }
+
     /**
      * Update the workspace/agent status to the listeners, if it has changed.
      */
@@ -140,7 +157,8 @@ class CoderRemoteEnvironment(
         agent
     )
 
-    override val connectionRequest: MutableStateFlow<Boolean>? = MutableStateFlow(false)
+    private var isConnected = false
+    override val connectionRequest: MutableStateFlow<Boolean> = MutableStateFlow(false)
 
     /**
      * Does nothing.  In theory, we could do something like start the workspace
@@ -149,10 +167,9 @@ class CoderRemoteEnvironment(
      * to be much value.
      */
     override fun setVisible(visibilityState: EnvironmentVisibilityState) {
-        if (wsRawStatus.ready() && visibilityState.contentsVisible == true && visibilityState.isBackendConnected == false) {
-            context.logger.info("Connecting to $id...")
+        if (wsRawStatus.ready() && visibilityState.contentsVisible == true && isConnected == false) {
             context.cs.launch {
-                connectionRequest?.update {
+                connectionRequest.update {
                     true
                 }
             }