Firebird services support

[artyom-smirnov]

Low level services wire protocol implementation and wrappers for backup, nbackup, user and trace management

[artyom-smirnov]

This is WIP pull request. Before making it "ready to merge" I want to add maintenance management (repair, sweep, etc) and add some testing. If you have a some time, take a glance. May be you see it somehow different.

[bat22]

In my opinion:

• use int instead of int16 here

type XPBReader struct {
	buf []byte
	pos int16
}

• Bytes() is more idiomatic name for

func (pb *XPBWriter) GetBuffer() []byte

• use append() instead of bytes.Join() in XPBWriter (with method Reset() object can be reused with existing buffer)

ps
what does XPB mean?

[artyom-smirnov]

what does XPB mean?

Just common name for DPB, RPB.

[bat22]

I think most likely case for XPBReader.Reset is reset with new byte slice
for example: https://pkg.go.dev/strings#Reader.Reset, https://pkg.go.dev/bytes#Reader.Reset

[nakagami]

Great work!

I don't know much about the service API, but I think the code is good.
Test code is also good.

It would be even better if you could include an example in the README if possible, but I think I will merge it without the README when this work is completed.

[HelioNeto]

Hello, congratulations on the initiative, it will be great to have the backup/restore directly through the service port. It is now available for use. I tried to "go get" but I can't use it.
Thanks

[artyom-smirnov]

Hello, congratulations on the initiative, it will be great to have the backup/restore directly through the service port. It is now available for use. I tried to "go get" but I can't use it. Thanks

Hi! I was bit busy with work and did not finished this patch so this is still WIP. I will be happy if it will be feature which will be useful to someone. Will try to complete work in near time!

[HelioNeto]

Hi! I was bit busy with work and did not finished this patch so this is still WIP. I will be happy if it will be feature which will be useful to someone. Will try to complete work in near time!

No problem friend, if it's just because of me, don't worry, I'm still testing the Go language and I don't have any real projects yet.
but this feature will add a lot to the community, I already use Firebird in other languages ​​and using the "Service Port" avoids the need to use "gbak".
Thanks again.

[artyom-smirnov]

Shame I have no much time to complete this PR early. I think it mostly complete now. I have added tests and some examples how to work with service manager. @nakagami if it looks OK to you please merge. Will be glad to hear any critics from anyone.

[nakagami]

I have been waiting for your pull request, Thank you !

I'm not sure about the service API, but it doesn't seem to harm the existing code, so I'll merge it and wait for feedback from other developpers.