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Remote Debugging with go-delve
Delve is a debugger for the Go programming language. The goal of the project is to provide a simple, full featured debugging tool for Go. Delve should be easy to invoke and easy to use. Chances are if you're using a debugger, things aren't going your way. With that in mind, Delve should stay out of your way as much as possible.
Use-case
Cosmos-SDK provides you with a local network to bootstrap a chain in your machine, but how does one debug a node or module?
If we start a single node, we won't be able to debug transactions as the machine will be in bootstrapping phase trying to find peers to connect too, that's why we need to start a local network.
But the current localnet-start does not provide us with debugging tools so that's why there is a different image for debugging a local network, that is to avoid any issues in the future were debugging won't be needed.
Both simd-env and simd-dlv work and run the same, except that simd-dlv uses go-delve to run the binaries.
How to use
The command to start a local network in debug mode is:
# make localnet-debug
The command to stop the local network and destroy its containers is:
# make localnet-stop
note: this works the same for both localnet-start and localnet-debug
Now, by default only simdnode0 is run in debug mode, but you can run any of the other nodes in debug mode by changing the DEBUG environment variable to 1 in docker-compose.yml.
How to connect
Delve will open a port on 2345 for simdnode0 and it will increment for each of the other nodes that have DEBUG set to 1.
You can connect to the debugging server either through GoLand IDE or you can use delve cli command.