adding an ftl.Call to another module causes infinite build/deploy loop

[mistermoe]

module code is exact same as #1199 . here's what happened when i wrote that ftl.Call for the first time:

ftlbug.mov

no compile errors in project.

[wesbillman]

I was able to catch a glipse of this issue happening and it seemed like rates/go.mod file was getting updated during the build triggering another build and it happened over and over many times. In my case, things eventually stopped deploying so I'm not 100% this was the exact issue.

[wesbillman]

Ok got a log with debug:

debug: Extracting dependencies for module "rates"
info:rates: Building module
debug:rates: Generating external modules
debug:rates: Extracting schema
debug: changed module "rates": */Users/wesbillman/dev/deleteme/rates/go.mod
debug:rates: Generating main module
debug:rates: Tidying go.mod files
debug:rates: Compiling
info:rates: Deploying module
debug:rates: Uploading 0/1 files
debug:controller0: Created deployment rates-af886ed5c8
debug:controller0: Replace deployment for: rates-af886ed5c8
debug:controller0: Deployment already exists: rates-af886ed5c8
debug:rates: Waiting for deployment rates-af886ed5c8 to become ready
debug: changed module "rates": */Users/wesbillman/dev/deleteme/rates/go.mod
debug: Extracting dependencies for module "rates"
info:rates: Building module
debug:rates: Generating external modules
debug:rates: Extracting schema
debug:rates: Generating main module
debug:rates: Tidying go.mod files
debug: changed module "rates": */Users/wesbillman/dev/deleteme/rates/go.mod
debug:rates: Compiling
info:rates: Deploying module
debug:rates: Uploading 0/1 files
debug:controller0: Created deployment rates-af886ed5c8
debug:controller0: Replace deployment for: rates-af886ed5c8
debug:controller0: Deployment already exists: rates-af886ed5c8
debug:rates: Waiting for deployment rates-af886ed5c8 to become ready
debug: changed module "rates": */Users/wesbillman/dev/deleteme/rates/go.mod
debug: Extracting dependencies for module "rates"
info:rates: Building module
debug:rates: Generating external modules
debug:rates: Extracting schema
debug:rates: Generating main module
debug:rates: Tidying go.mod files
debug:rates: Compiling
info:rates: Deploying module
debug:rates: Uploading 0/1 files
debug:controller0: Created deployment rates-af886ed5c8
debug:controller0: Replace deployment for: rates-af886ed5c8
debug:controller0: Deployment already exists: rates-af886ed5c8
debug:rates: Waiting for deployment rates-af886ed5c8 to become ready
debug: Extracting dependencies for module "rates"
info:rates: Building module
debug:rates: Generating external modules
debug:rates: Extracting schema
debug: changed module "rates": */Users/wesbillman/dev/deleteme/rates/go.mod
debug:rates: Generating main module
debug:rates: Tidying go.mod files
debug:rates: Compiling
info:rates: Deploying module
debug:rates: Uploading 0/1 files
debug:controller0: Created deployment rates-af886ed5c8
debug:controller0: Replace deployment for: rates-af886ed5c8
debug:controller0: Deployment already exists: rates-af886ed5c8
debug:rates: Waiting for deployment rates-af886ed5c8 to become ready
debug: changed module "rates": */Users/wesbillman/dev/deleteme/rates/go.mod

And it seems like go.mod is just adding and removing this line require github.com/TBD54566975/ftl v0.163.4 (but it was flashing fast so hard to say for sure). And this rates module should not need require github.com/TBD54566975/ftl v0.163.4 since it's not using any ftl thing directly.

The final, good go.mod for this module is:

module ftl/rates

go 1.22.1

toolchain go1.22.2