Dapr + .NET 实战（九）本地调试

前几节开发Dapr应用程序时，我们使用 dapr cli 来启动dapr服务，就像这样：

dapr run --dapr-http-port 3501 --app-port 5001  --app-id frontend dotnet  .\FrontEnd\bin\Debug\net5.0\FrontEnd.dll

如果你想要通过dapr调试服务呢？在这里使用 dapr 运行时(daprd) 来帮助实现这一点。具体原理就是先从命令行中运行符合正确参数的 daprd，然后启动您的代码并附加调试器。

1.配置launch.json

vscode打开项目，并创建launch.json

修改launch.json的preLaunchTask，自定义名字，preLaunchTask将引用在 tasks.json 文件中定义的任务。

{// Use IntelliSense to learn about possible attributes.// Hover to view descriptions of existing attributes.// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387"version": "0.2.0","configurations": [{"name": "Frontend-.NET Core Launch (web)","type": "coreclr","request": "launch",//"preLaunchTask": "build","preLaunchTask": "daprd-frontend","program": "${workspaceFolder}/FrontEnd/bin/Debug/net5.0/FrontEnd.dll","args": [],"cwd": "${workspaceFolder}/FrontEnd","stopAtEntry": false,"serverReadyAction": {"action": "openExternally","pattern": "\\bNow listening on:\\s+(https?://\\S+)"},"env": {"ASPNETCORE_ENVIRONMENT": "Development"},"sourceFileMap": {"/Views": "${workspaceFolder}/Views"}},{"name": ".NET Core Attach","type": "coreclr","request": "attach"}]
}

2.配置task.json

需要在task.json文件中定义一个 daprd task和问题匹配器（problem matcher）。这里有两个通过上述 preLaunchTask 成员引用。在 dpred -frontend task下，还有一个dependsOn成员，它引用build任务，以确保最新的代码正在运行/调试。用了 problemMatcher，这样当 daprd 进程启动和运行时，VSCode 就能够知道。

{"version": "2.0.0","tasks": [{"label": "build","command": "dotnet","type": "process","args": ["build","${workspaceFolder}/FrontEnd/FrontEnd.csproj","/property:GenerateFullPaths=true","/consoleloggerparameters:NoSummary"],"problemMatcher": "$msCompile"},{"label": "publish","command": "dotnet","type": "process","args": ["publish","${workspaceFolder}/FrontEnd/FrontEnd.csproj","/property:GenerateFullPaths=true","/consoleloggerparameters:NoSummary"],"problemMatcher": "$msCompile"},{"label": "watch","command": "dotnet","type": "process","args": ["watch","run","${workspaceFolder}/FrontEnd/FrontEnd.csproj","/property:GenerateFullPaths=true","/consoleloggerparameters:NoSummary"],"problemMatcher": "$msCompile"},{"label": "daprd-frontend","command": "daprd","args": ["-app-id","frontend","-app-port","5001","-dapr-http-port","3501","-placement-host-address","localhost:6050","-components-path","C:\\Users\\chesterychen\\.dapr\\components"],"isBackground": true,"problemMatcher": {"pattern": [{"regexp": ".","file": 1,"location": 2,"message": 3}],"background": {"beginsPattern": "^.*starting Dapr Runtime.*","endsPattern": "^.*waiting on port.*"}},"dependsOn": "build"},]
}

因为没有使用 dapr run* cli 命令，所以运行 daprd list 命令将不会显示当前正在运行的应用列表。

3.调试

在StateController.GetAsync中新增断点，运行并调用http://192.168.43.94:3501/v1.0/invoke/frontend/method/State。

4.不用vscode调试

cmd运行以下命令，监听5001端口

daprd run -dapr-http-port 3501 -app-port 5001  -app-id frontend -placement-host-address localhost:6050 -components-path C:\\Users\\chesterychen\\.dapr\\components

然后直接vs运行项目，即可调试