Add support for namespace mutations

[alexellis]

Description

Add support for namespace mutations

Motivation and Context

Adds support for: Get, Create, Update, Delete

How Has This Been Tested?

List, delete non-existing, delete existing, list, get

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespaces;echo;
HTTP/1.1 200 OK
Content-Length: 29
Content-Type: application/json
Date: Fri, 07 Jul 2023 10:29:08 GMT

["openfaas-fn","dev4","dev6"]
$ 
$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev1 -d '{"name":"dev1", "labels":{"openfaas":"1"}}' -X DELETE; echo
HTTP/1.1 404 Not Found
Content-Length: 25
Content-Type: text/plain; charset=utf-8
Date: Fri, 07 Jul 2023 10:29:18 GMT
X-Content-Type-Options: nosniff

namespace dev1 not found

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev6 -d '{"name":"dev6", "labels":{"openfaas":"1"}}' -X DELETE; echo
HTTP/1.1 202 Accepted
Content-Length: 0
Date: Fri, 07 Jul 2023 10:29:26 GMT

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespaces;echo;
HTTP/1.1 200 OK
Content-Length: 22
Content-Type: application/json
Date: Fri, 07 Jul 2023 10:29:29 GMT

["openfaas-fn","dev4"]
$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev4
HTTP/1.1 200 OK
Content-Length: 42
Content-Type: application/json
Date: Fri, 07 Jul 2023 10:29:43 GMT

{"name":"dev4","labels":{"openfaas":"1"}}
$ 

Update labels:

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev4
HTTP/1.1 200 OK
Content-Length: 42
Content-Type: application/json
Date: Fri, 07 Jul 2023 10:30:19 GMT

{"name":"dev4","labels":{"openfaas":"1"}}
$ 
$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev4 -d '{"name":"dev4", "labels":{"openfaas":"1", "alex":"1"}}' -X PUT
HTTP/1.1 202 Accepted
Content-Length: 0
Date: Fri, 07 Jul 2023 10:30:34 GMT

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev4
HTTP/1.1 200 OK
Content-Length: 53
Content-Type: application/json
Date: Fri, 07 Jul 2023 10:30:36 GMT

{"name":"dev4","labels":{"alex":"1","openfaas":"1"}}
$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev4 -d '{"name":"dev4", "labels":{"openfaas":"1"}}' -X PUT
HTTP/1.1 202 Accepted
Content-Length: 0
Date: Fri, 07 Jul 2023 10:30:41 GMT

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/dev4
HTTP/1.1 200 OK
Content-Length: 42
Content-Type: application/json
Date: Fri, 07 Jul 2023 10:30:43 GMT

{"name":"dev4","labels":{"openfaas":"1"}}
$ 

Note that namespace creation requires a trailing slash:

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespace/ -d '{"name":"dev10", "labels":{"openfaas":"1"}}' -X POST
HTTP/1.1 201 Created
Content-Length: 0
Date: Fri, 07 Jul 2023 10:31:36 GMT

$ curl -i http://admin:$(sudo cat /var/lib/faasd/secrets/basic-auth-password)@127.0.0.1:8080/system/namespaces;echo;
HTTP/1.1 200 OK
Content-Length: 30
Content-Type: application/json
Date: Fri, 07 Jul 2023 10:31:42 GMT

["openfaas-fn","dev10","dev4"]
$ 

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

[alexellis]

@nitishkumar71 if you have any feedback please let me know and I'll follow up