How does --read-from-tcp-port=PORT work?

[guest271314]

How does --read-from-tcp-port=PORT work? 

Does d8 read from TCP port as stdin with readline()?

Is the read from TCP port executed by d8?

[Leszek Swirski]

--read-from-tcp-port=PORT is a little hack to allow d8 running on a remote device (in particular, on an Android phone) to read files from an external server (in particular, an attached workstation). I added this to help us run tests on an Android device without needing to push all the relevant JS files to the device, by instead doing some port forwarding (see tools/adb-d8.py); it's not for reading stdin.

[guest271314]

Thanks. How does it work though?

The only example I found was a Python script. I didn't see a way to use the capability in d8.

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[Leszek Swirski]

When d8 reads a file, if the flag is set then the file read is hijacked and redirected to the tcp port (here: https://source.chromium.org/chromium/chromium/src/+/main:v8/src/d8/d8.cc;l=4290;drc=d5d65f04079b486bfbe0fa272cdaf242525af74b). There's no other way to use this from d8, or for JS code in d8 to access this port.

To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/CA%2BsyWAOVFTxH5JK7_u44jvRF5v5MspnpSJkEPQk_-Y05gCjQdA%40mail.gmail.com.