refactor(connector): update add connector script with new connector features

[swetasharma03]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• Removed the unwanted changes (like addition of conector_name in RoutableConnectors enum, etc)
• Amount convertor code is generated in the template
• Connector Specification is also added in the template
• Network error codes added
• validate_mandate_payment, validate_psync_reference_id, toml files doesn't directly implements cards as supported payment method
• The unit test file now generated directly to crates/router/tests/connectors etc
• Derive macro copy added for all unit types like enums which only have 1 type of data (eg payment status, refund status) and structs which only have primitive types like i64, u64 , bool, char or unit structs.
• Connector getting added in all the files in alphabetical order
• In default_implmentation.rs, if connector previous to the new connector doesn't exist in any default_imp list, the new_connector will be added on the top of the list, else it will be in alphabetically sorted.
• Code getting compiled directly after template generation.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

This PR only updates the script to generate template code for a connector, hence no API testing required.

Script used to test the template generation.
sh scripts/add_connector.sh testConnector https://www.google.com/

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/hyperswitch_connectors/src/default_implementations.rs	2% smaller
connector-template/mod.rs	Unsupported file format
connector-template/test.rs	Unsupported file format
connector-template/transformers.rs	Unsupported file format
scripts/add_connector.sh	Unsupported file format

[SanchithHegde]

Could we at least have some comments as to what is happening here?

[swetasharma03]

Previously, in default_implementations.rs,default_implementations_v2.rs, the new connector was always added at the top of the macro list, without maintaining alphabetical order.

Also using a single sed command to insert the new connector depends on the presence of the previous_connector in the macro block. This approach fails when the previous_connector is missing from one or more lists, leading to skipped insertions.

To handle this correctly, the current logic does the following:

• If the previous_connector exists in the macro, the new_connector is added after it, preserving alphabetical order.
• If the previous_connector is not found, the new_connector is inserted at the top of the macro list.

I've also added comments in the code.

[SanchithHegde]

Isn't this going to generate more temporary files, but we' have a step before this which says "Remove temporary files created in above step".

Can we move this line above the rm command?

[swetasharma03]

We’re already running the rm command immediately after the sed edit for crates/hyperswitch_domain_models/src/configs.rs, so the temp file (.rs-e) is cleaned up right away. I’ve tested the script multiple times, and no temporary files are left behind.

sed -i'' -e "/pub ${previous_connector}: ConnectorParams,/a\\
    pub ${payment_gateway}: ConnectorParams,
" crates/hyperswitch_domain_models/src/configs.rs
rm crates/hyperswitch_domain_models/src/configs.rs-e

What are your thoughts? Do we still need to move this code above, or is the current placement okay?

[SanchithHegde]

Can we then group all the sed commands together, followed by one rm command? So move this sed command before the big rm command?