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src/docs/vscode_python.md
Ryan Heise 7e36b15b99 Fix local Python VSCode debugger instructions
Change-Id: I86a9b0e4d74f57cf1e20976084504cacc1883b63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480804
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Ryan Heise <heiserya@google.com>
Auto-Submit: Ryan Heise <heiserya@google.com>
Cr-Commit-Position: refs/heads/master@{#817967}
2020-10-16 16:55:33 +00:00

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# Debugging Chromium Python With The VSCode Debugger
## Before You Begin
1. Patch in [this CL](https://chromium-review.googlesource.com/c/chromium/src/+/2466896).
2. Run gclient sync.
## Via SSH
SSH is useful if youre modifying and debugging code on another device, such as
the desktop sitting at your office desk. To do so:
1. Set up VSCode to work with normal development by following the instructions
in the Remote Visual Studio Code section
[here](https://docs.google.com/document/d/1ZlG8VQxudxvDs-EtpQvaPVcAPfSMdYlXr42s_487wLo/edit#bookmark=id.j10hyv6nlkws).
2. Open the Connection Dialog of Chromes SSH plugin: ![open
dialog](images/vscode_python_connection_dialog.png)
3. Create a new connection and set the username, hostname, port, and SSH relay
server options as you normally would. Then, set SSH arguments to "-2 -L
50371:localhost:50371"
a. You can replace 50371 with a different value, so long as it's consistent
with step 7b.
4. Open a connection, and set this window aside.
5. In VSCode, open the code you want to set a breakpoint in, and add the
following:
```
import debugpy
# Your code here!
debugpy.listen(50371)
print("Wait for attach...")
debugpy.wait_for_attach()
debugpy.brerakpoint()
```
Note: The port passed to debugpy.listen() should match the port configured in (3).
6. Click on the Debug tab
7. Click Run. A dialog will appear asking you to set up a debug configuration.
Do so, and select “Remote Debug”.
a. Leave the hostname as-is
b. Set the port to 50371
8. Run your program on the remote machine. It should stop executing at “Wait for
attach”.
9. Start the debugger in VSCode. It should attach!
## Locally
Follow the same steps as above, but start from step 5.