Add properties and env vars resolution

[ngaggi73]

Changes Description

Added the possibility to resolve values from other properties or environment variables using the placeholder ${<variable/property name>?(:)}.

During the unmarshalling of a configuration into a struct each property value is checked to find the presence of placeholders as the one showed above. Each placeholder is then substituted by the corresponding value of the property or environment variable, if defined, or the default value if specified. Otherwise the placeholder is left untouched.

For example the property value mongo://user:password@${mongo.database.host:localhost} will be resolved in

• mongo://user:password@mongodb if the property mongo.database.host is defined and its value is 'mongodb'
• mongo://user:password@localhost if the property isn't defined

If there's no default value and the referenced property isn't defined the expression is left untouched.

Associated Issues

No conversion can be done on default values

Affected Files

configuration.go
configuration_test.go

Unit Tests Changed or Added

Added environment variables and properties resolution test case to TestSource_Unmarshal function in configuration_test.go

[Piszmog]

Thank you for the contribution. Please revert the package name paths. You changed Piszmog to your username

[Piszmog]

Also, please elaborate further in the description of the PR. Provide documentation, examples, etc... The current description of the PR does not tell me what is going on, why this is an issue, and the different scenarios you would expect to see.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[ngaggi73]

Hi, I did what you asked for. Let me know if there's something else I must do Have a nice day Il 03/12/2024 05:06, Randell Callahan ha scritto:

…

Also, please elaborate further in the description of the PR. Provide documentation, examples, etc... — Reply to this email directly, view it on GitHub <https://github.com/Piszmog/cloudconfigclient/ pull/89#issuecomment-2513503223>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ AMOUL3ZTP6NQEUUH2NUQLIT2DUU5TAVCNFSM6AAAAABS3FUADOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDKMJTGUYDGMRSGM>. You are receiving this because you authored the thread. [Disarmed tracker from https://github.com/ notifications/beacon/ AMOUL3636DLLJHWHUHPF2QD2DUU5TA5CNFSM6AAAAABS3FUADOWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTUV2EB7O.gif] Message ID: ***@***.***>

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