TCP Dump (#281)

---------

Co-authored-by: Tatsinnit <[email protected]>

package.json

@@ -243,6 +243,10 @@
             {
                 "command": "aks.aksRunKubectlCommands",
                 "title": "Run Kubectl Commands"
+            },
+            {
+                "command": "aks.aksTCPDump",
+                "title": "Collect TCP Dumps"
             }
         ],
         "menus": {
@@ -305,6 +309,11 @@
                     "command": "aks.aksInspektorGadgetShow",
                     "when": "view == kubernetes.cloudExplorer && viewItem =~ /aks\\.cluster/i || view == extension.vsKubernetesExplorer && viewItem =~ /vsKubernetes\\.\\w*cluster$/i",
                     "group": "9@4"
+                },
+                {
+                    "command": "aks.aksTCPDump",
+                    "when": "view == kubernetes.cloudExplorer && viewItem =~ /aks\\.cluster/i || view == extension.vsKubernetesExplorer && viewItem =~ /vsKubernetes\\.\\w*cluster$/i",
+                    "group": "9@5"
                 }
             ],
             "aks.createClusterSubMenu": [
@@ -396,6 +405,10 @@
             {
                 "id": "aks.createClusterSubMenu",
                 "label": "Create Cluster"
+            },
+            {
+                "id": "aks.tcpDataCollectionSubMenu",
+                "label": "Collect TCP Dump"
             }
         ]
     },

src/commands/aksTCPCollection/tcpDumpCollection.ts

@@ -0,0 +1,66 @@
+import * as vscode from 'vscode';
+import * as k8s from 'vscode-kubernetes-tools-api';
+import { IActionContext } from "@microsoft/vscode-azext-utils";
+import { getKubernetesClusterInfo } from '../utils/clusters';
+import { getExtension } from '../utils/host';
+import { Errorable, failed, map as errmap } from '../utils/errorable';
+import * as tmpfile from '../utils/tempfile';
+import { TcpDumpDataProvider, TcpDumpPanel } from '../../panels/TcpDumpPanel';
+import { getVersion, invokeKubectlCommand } from '../utils/kubectl';
+
+export async function aksTCPDump(_context: IActionContext, target: any) {
+    const kubectl = await k8s.extension.kubectl.v1;
+    const cloudExplorer = await k8s.extension.cloudExplorer.v1;
+    const clusterExplorer = await k8s.extension.clusterExplorer.v1;
+
+    if (!kubectl.available) {
+        vscode.window.showWarningMessage(`Kubectl is unavailable.`);
+        return;
+    }
+
+    if (!cloudExplorer.available) {
+        vscode.window.showWarningMessage(`Cloud explorer is unavailable.`);
+        return;
+    }
+
+    if (!clusterExplorer.available) {
+        vscode.window.showWarningMessage(`Cluster explorer is unavailable.`);
+        return;
+    }
+
+    const clusterInfo = await getKubernetesClusterInfo(target, cloudExplorer, clusterExplorer);
+    if (failed(clusterInfo)) {
+        vscode.window.showErrorMessage(clusterInfo.error);
+        return;
+    }
+
+    const extension = getExtension();
+    if (failed(extension)) {
+        vscode.window.showErrorMessage(extension.error);
+        return;
+    }
+
+    const kubeConfigFile = await tmpfile.createTempFile(clusterInfo.result.kubeconfigYaml, "yaml");
+    const linuxNodesList = await getLinuxNodes(kubectl, kubeConfigFile.filePath);
+    if (failed(linuxNodesList)) {
+        vscode.window.showErrorMessage(linuxNodesList.error);
+        return;
+    }
+
+    const kubectlVersion = await getVersion(kubectl, kubeConfigFile.filePath);
+    if (failed(kubectlVersion)) {
+        vscode.window.showErrorMessage(kubectlVersion.error);
+        return;
+    }
+
+    const dataProvider = new TcpDumpDataProvider(kubectl, kubeConfigFile.filePath, kubectlVersion.result, clusterInfo.result.name, linuxNodesList.result);
+    const panel = new TcpDumpPanel(extension.result.extensionUri);
+
+    panel.show(dataProvider, kubeConfigFile);
+}
+
+async function getLinuxNodes(kubectl: k8s.APIAvailable<k8s.KubectlV1>, kubeConfigFile: string): Promise<Errorable<string[]>> {
+    const command = `get node -l kubernetes.io/os=linux --no-headers -o custom-columns=":metadata.name"`;
+    const commandResult = await invokeKubectlCommand(kubectl, kubeConfigFile, command);
+    return errmap(commandResult, sr => sr.stdout.trim().split("\n"));
+}

src/commands/utils/kubectl.ts

@@ -8,22 +8,66 @@ export enum NonZeroExitCodeBehaviour {
     Fail
 }
 
-export async function invokeKubectlCommand(kubectl: APIAvailable<KubectlV1>, kubeConfigFile: string, command: string, exitCodeBehaviour?: NonZeroExitCodeBehaviour): Promise<Errorable<KubectlV1.ShellResult>> {
-    try {
+type KubeconfigCommandConfig = {
+    plainCommand: string,
+    commandWithKubeconfig: string,
+    exitCodeBehaviour: NonZeroExitCodeBehaviour
+};
+
+export type K8sVersion = {
+    major: string,
+    minor: string,
+    gitVersion: string,
+    buildDate: string
+};
+
+export type KubectlVersion = {
+    clientVersion: K8sVersion,
+    serverVersion: K8sVersion
+};
+
+export function getVersion(kubectl: APIAvailable<KubectlV1>, kubeConfigFile: string): Promise<Errorable<KubectlVersion>> {
+    return getKubectlJsonResult(kubectl, kubeConfigFile, "version -o json");
+}
+
+export async function getExecOutput(kubectl: APIAvailable<KubectlV1>, kubeConfigFile: string, namespace: string, pod: string, podCommand: string): Promise<Errorable<KubectlV1.ShellResult>> {
+    const plainCommand = `exec -n ${namespace} ${pod} -- ${podCommand}`;
+    const config: KubeconfigCommandConfig = {
+        plainCommand,
+        // Note: kubeconfig is the first argument because it needs to be part of the kubectl args, not the exec command's args.
+        commandWithKubeconfig: `--kubeconfig="${kubeConfigFile}" ${plainCommand}`,
+        // Always fail for non-zero exit code.
+        exitCodeBehaviour: NonZeroExitCodeBehaviour.Fail
+    };
+
+    return invokeKubectlCommandInternal(kubectl, config);
+}
+
+export function invokeKubectlCommand(kubectl: APIAvailable<KubectlV1>, kubeConfigFile: string, command: string, exitCodeBehaviour?: NonZeroExitCodeBehaviour): Promise<Errorable<KubectlV1.ShellResult>> {
+    const config: KubeconfigCommandConfig = {
+        plainCommand: command,
         // Note: kubeconfig is the last argument because kubectl plugins will not work with kubeconfig in start.
-        const shellResult = await kubectl.api.invokeCommand(`${command} --kubeconfig="${kubeConfigFile}"`);
+        commandWithKubeconfig: `${command} --kubeconfig="${kubeConfigFile}"`,
+        exitCodeBehaviour: (exitCodeBehaviour === undefined) ? NonZeroExitCodeBehaviour.Fail : NonZeroExitCodeBehaviour.Succeed
+    };
+
+    return invokeKubectlCommandInternal(kubectl, config);
+}
+
+async function invokeKubectlCommandInternal(kubectl: APIAvailable<KubectlV1>, config: KubeconfigCommandConfig): Promise<Errorable<KubectlV1.ShellResult>> {
+    try {
+        const shellResult = await kubectl.api.invokeCommand(config.commandWithKubeconfig);
         if (shellResult === undefined) {
-            return { succeeded: false, error: `Failed to run kubectl command "${command}"` };
+            return { succeeded: false, error: `Failed to run command "kubectl ${config.plainCommand}"` };
         }
 
-        exitCodeBehaviour = (exitCodeBehaviour === undefined) ? NonZeroExitCodeBehaviour.Fail : NonZeroExitCodeBehaviour.Succeed;
-        if (shellResult.code !== 0 && exitCodeBehaviour === NonZeroExitCodeBehaviour.Fail) {
-            return { succeeded: false, error: `Kubectl returned error ${shellResult.code} for ${command}\nError: ${shellResult.stderr}` };
+        if (shellResult.code !== 0 && config.exitCodeBehaviour === NonZeroExitCodeBehaviour.Fail) {
+            return { succeeded: false, error: `The command "kubectl ${config.plainCommand}" returned status code ${shellResult.code}\nError: ${shellResult.stderr}` };
         }
 
         return { succeeded: true, result: shellResult };
     } catch (e) {
-        return { succeeded: false, error: `Error running kubectl command "${command}": ${getErrorMessage(e)}` };
+        return { succeeded: false, error: `Error running "kubectl ${config.plainCommand}":\n${getErrorMessage(e)}` };
     }
 }
 

src/extension.ts

@@ -32,6 +32,7 @@ import { aksInspektorGadgetShow } from './commands/aksInspektorGadget/aksInspekt
 import aksCreateCluster from './commands/aksCreateCluster/aksCreateCluster';
 import aksAbortLastOperation from './commands/aksAbortLastOperation/aksAbortLastOperation';
 import aksReconcileCluster from './commands/aksReconcileCluster/aksReconcileCluster';
+import { aksTCPDump } from './commands/aksTCPCollection/tcpDumpCollection';
 
 export async function activate(context: vscode.ExtensionContext) {
     const cloudExplorer = await k8s.extension.cloudExplorer.v1;
@@ -77,6 +78,7 @@ export async function activate(context: vscode.ExtensionContext) {
         registerCommandWithTelemetry('aks.aksReconcileCluster', aksReconcileCluster);
         registerCommandWithTelemetry('aks.aksInspektorGadgetShow', aksInspektorGadgetShow);
         registerCommandWithTelemetry('aks.createCluster', aksCreateCluster);
+        registerCommandWithTelemetry('aks.aksTCPDump', aksTCPDump);
 
         await registerAzureServiceNodes(context);