Hot-Reload for Development

[jeevatkm]

Goal is to provide hot-reload capabilities for development, so that it helps developer to have fun development.

What is Hot-Reload?

To reflect changes made in Static Files (js, css), View template file and Go Source Code without manual intervention (i.e. manually stopping server and starting the aah server). Instead aah CLI will do monitoring/watch on aah project and does automatic stop, compile and start the aah server.

Design and Implementation

Approach and solution will be done in aah cli tool. It is not applicable for prod environment profile. It highly recommended to build and deploy the archive for production use.

Static Files

aah framework delivers static file using standard library func http.ServeContent, which is by default adds the Last-Modified response header and by default modern web browser does cache the static files locally.

Solution is to prevent cache and deliver file always- (only for dev environment profile)

• Set these HTTP headers
  • Cache-Control: no-cache, no-store, max-age=0, must-revalidate
  • Expires: 0

Go Source directory, view directory, config directory

Typically every go program gets compiled before the execution. The view template files compiled and stored in memory on server start.

Solution is to reflect code changes - (only for dev environment profile)

• Monitor files and directories
• If change event occur then stop the server, recompile and then start the server
• There are limitation to this, will document it later on.
  * Standard Library Path is not applicable i.e. GOROOT

Will try to bring this feature as early as possible.

• Static Files
• View Template Files
• Go Source Code
• Config Files

[ghost]

how long will it take?

[jeevatkm]

@elevenbag Currently I'm working to wrap up v0.6 release. Then I will be targeting this feature for v0.7

Thank you for your interest.

[jeevatkm]

Cleaning up few comments that doesn't belongs to this thread. Anyway conversation took place in another thread.

[ghost]

I look forward to your good news.

[jeevatkm]

I have evaluated fsnotify and watcher library for monitoring file and directory changes.

I believe watcher library would be better fit for aah framework, I have created issue at watcher library radovskyb/watcher#20 to get few clarifications before I start integrating into aah framework.

[adelowo]

I have used fsnotify before and i can say it is a good fit too..

[jeevatkm]

@adelowo Yes I agree with you, I'm using it too. fsnotify was my first choice then I come across watcher library without using filesystem events.

I will wait for response then we can take final choice.

[jeevatkm]

It's done, hooray!