feat: Render config.go (first stage) and improvements in rendering entry.go

[sebastianczech]

Description

PR delivers generation of config.go (first stage) for objects, which are not entries (like NTP settings).

Moreover it introduces improvements in rendering entry.go:

• improve rendering of nested structs
• introduce versioning of structs and params (dependent from profiles)

Motivation and Context

• Render entry.go #30
• Render config.go #37
• Rebuild function SpecMatches() in entry.go #38
• Rebuild function CopyMiscFrom in entry.go #39

How Has This Been Tested?

Automated tests are part of PR.

Moreover entry.go generated for address and service was checked directly with the firewall in the cloud.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

[sebastianczech]

During review, please take a look especially on:

• refactored functions to render struct with nested specs:

  pan-os-codegen/pkg/translate/funcs.go

  Line 37 in a361d44

  func SpecifyEntryAssignment(objectType string, param *properties.SpecParam, version string) string {

  what can be viewed on automatically rendered generated-pango in file generated-pango/objects/service/entry.go
• getting supported profile versions:

  pan-os-codegen/pkg/properties/normalized.go

  Line 300 in fa24222

  func (spec *Normalization) SupportedVersions() []string {

• getting support of 1 param for specific version:

  pan-os-codegen/pkg/translate/structs.go

  Line 138 in fa24222

  func ParamSupportedInVersion(param *properties.SpecParam, deviceVersionStr string) bool {

• render SpecMatches with multiple nested functions checking each attribute:

  pan-os-codegen/pkg/translate/funcs.go

  Line 145 in a361d44

  func NestedSpecMatchesFunction(spec *properties.Spec) string {

Note - currently that function is also generating functions to compare int- can I take file https://github.com/PaloAltoNetworks/pango/blob/develop/util/comparison.go , put it as static assets and do not create specific function for that, use new function from util ? Copying static files is working and it was delivered in #29.

[pimielowski]

After internal testing I found some issue which was resolved by @sebastianczech here:
0235c2a
52d26ef

Overall very great approach!
We agreed to push forward with known issues:

• tags color (to be defined based on the separated struct, in tag.yaml it is implemented already)
• function in entry.tmpl MarshalXML currently if we specified version to the ie fqdn_refresh_time parameter in struct/dns.yaml it will generate with attribute related to the versioned struct, which in summary create missing parameter (because MarshalXML is c configXML where this variable don't exists)

Also, there was an topic related to the duplication in generated code, and to handle this case after some testing I found 2 solution we can try:

• use Reflect library to create complex dynamic structure
• use a lot of custom logic with struct merges

either of this approaches could take a long time to figure it out the best approach, so we agreed that we will move forward with that approach that we have right now, and we tackle this issue later.