This Go App runs on both Win and Mac

The app stays running (ie it should be like our previous one) and it listens the calls to it on a certain port, i.e. it works as a RESTful API server.

The first function to add to it will be to communicate with the iOS app. A tiny iOS test app has a “Connect” button and then connects to this app and says “Success” if it connects .

That app code repo iOS mobile client is at https://github.com/block888dev/iOS-client-for-a-GoWeb-RESTful-service

Step1: this is just a “hello world” type of program to begin with and the test iOS app that connects to this server and handshakes or something. Of course when we achieve step 1 there will be more steps

test:

curl -i -X GET http://192.168.0.108:9090/
HTTP/1.1 200 OK
X-Custom-Header: Goweb
Date: Fri, 31 May 2024 07:23:42 GMT
Content-Length: 17
Content-Type: text/plain; charset=utf-8

Hello from GOLANG

Note: the iOS dev needs to implement authorisation with Bearer token since auth header is now implemented as planned:

curl -i -X GET localhost:9090
HTTP/1.1 401 Unauthorized
Content-Type: text/plain; charset=utf-8
X-Content-Type-Options: nosniff
Date: Thu, 05 Sep 2024 08:53:12 GMT
Content-Length: 13

Unauthorized

but sending auth token to API server gives OK, see example:

curl -i -X GET localhost:9090 -H "Authorization: Bearer mytoken123"
HTTP/1.1 200 OK
X-Custom-Header: Goweb
Date: Thu, 05 Sep 2024 08:58:07 GMT
Content-Length: 17
Content-Type: text/plain; charset=utf-8

Hello from GOLANG

step 2 (after we get “hello world” working), will be iOS sending a input.txt to Server2.exe test:

curl -i -X POST -H "Content-Type: multipart/form-data" -F "[email protected]" http://192.168.0.108:9090/upload
HTTP/1.1 200 OK
X-Custom-Header: Goweb
Date: Fri, 31 May 2024 06:50:44 GMT
Content-Length: 58
Content-Type: text/plain; charset=utf-8

File uploaded successfully{"e":["File processed"],"s":200}

Step3 Server copies input.txt to c:\bb and runs some app to process this text file

Step4

Step5

Step6

Extra features may be considered:

• limit the response from GO app and makie it only JSON
• log all events to mysql db
• add protection agains all calls and any client so that only the filtered ones gets through
• remove goweb framework's test REST API calls and keep just the needed ones

*Here is how the app gets compiled: example: env GOOS=target-OS GOARCH=target-architecture go build package-import-path real cmd:
GOOS=windows GOARCH=386 go build -o Server2.exe main.go or GOOS=windows GOARCH=amd64 go build -o Server2.exe main.go

PS: for clients:

Things to consider when building a RESTful API with PG SQL Database:

• how much data you have and would you need a pagination?
• which libs do you prefer to use for db connection and also for the REST API?
• do you need to setup an encrypted connection to db or just the default is OK?
• do you need docker-compose to be provided or just Golang code?
• do you need any Unit tests done?

Credits to GoWeb framework used: There are others but this one was one of first and is still good. Using the GoWeb framework in this a Go RESTful app just like my demo taken out of the production app, is indeed a great example. The framework provides predefined patterns, utilities, and tools that streamline the development process, much like how boilerplate code serves as a foundation to build upon quickly.