Support Records class

[syucream]

Support Records class, like Apache::Env and Nginx::Var.

[syucream]

I want more user-friendly and type-safe config setter ...

[syucream]

Records class will support below config getter/setter:

• https://trafficserver.readthedocs.io/en/latest/developer-guide/api/functions/TSHttpOverridableConfig.en.html#ts-overridable-config
• https://trafficserver.readthedocs.io/en/latest/developer-guide/api/types/TSOverridableConfigKey.en.html#c.TSOverridableConfigKey

[syucream]

I think this support should have some phase.

• At 0.1, support simply interfaces, like ngx_mruby:

records = ATS::Records.new

# getter
records.get ATS::Records::TS_CONFIG_URL_REMAP_PRISTINE_HOST_HDR #=> 0
# setter
records.set ATS::Records::TS_CONFIG_URL_REMAP_PRISTINE_HOST_HDR, 1

• In future, will support records.config like interfaces:

records = ATS::Records.new

# getter
records.proxy.config.url_remap.pristine_host_hdr #=> 0
records.url_remap.pristine_host_hdr #=> 0
# setter as #= method
records.proxy.config.url_remap.pristine_host_hdr = 1
records.url_remap.pristine_host_hdr = 1

[syucream]

As one of the future plan, block base settings may be usuful?:

records = ATS::Records.new
records.set do |proxy|
  # records.config like accessor!
  proxy.config.url_remap.pristine_host_hdr = 1
end

[syucream]

I registered #52 about future plans.