Class: Gcp::Api::Discovery::Watcher

Inherits:
Object
  • Object
show all
Defined in:
lib/gcp/api/discovery/watcher.rb,
lib/gcp/api/discovery/watcher/diff_hash.rb,
lib/gcp/api/discovery/watcher/api_metadata.rb

Defined Under Namespace

Modules: DiffHash Classes: ApiMetadata, Error

Instance Method Summary collapse

Instance Method Details

#current_filename(dir, api, version) ⇒ Object 



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# File 'lib/gcp/api/discovery/watcher.rb', line 49

def current_filename(dir, api, version)
  basedir = File.join(dir, api, version)
  File.join(basedir, "#{api}_#{version}.yaml")
end

#fetch_discover_api(api_name, version) ⇒ Object 



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# File 'lib/gcp/api/discovery/watcher.rb', line 15

def fetch_discover_api(api_name, version)
  url = "https://www.googleapis.com/discovery/v1/apis/#{api_name}/#{version}/rest"
  json = URI.open(url){|io| io.read }
  ApiMetadata.new(api_name, version, json)
end

#load_file(api_name, version, filepath) ⇒ Object 



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# File 'lib/gcp/api/discovery/watcher.rb', line 21

def load_file(api_name, version, filepath)
  ApiMetadata.new(api_name, version, File.read(filepath))
end

#metadata_filename(dir, metadata) ⇒ Object 



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# File 'lib/gcp/api/discovery/watcher.rb', line 54

def metadata_filename(dir, metadata)
  File.join(dir, metadata.api, metadata.version, "#{metadata.api}_#{metadata.version}_#{metadata.revision}.yaml")
end

#parse_options(argv, conf) ⇒ Object 



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# File 'lib/gcp/api/discovery/watcher.rb', line 30

def parse_options(argv, conf)
  OptionParser.new{|opt|
    opt.on("--api API_NAME", "GCP API Name (ex. ml, bigquery ...)") do |api|
      conf[:api] = api
    end
    opt.on("--api_version API_VERSION", "API version (ex. v1, v1beta1)") do |v|
      conf[:version] = v
    end
    opt.on("--storage DIR") do |dir|
      conf[:dir] = dir
    end
    opt.on("--output FILE") do |file|
      conf[:output_file] = file
    end
    opt.parse!
  }
  conf
end

#run(argv) ⇒ Object 



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# File 'lib/gcp/api/discovery/watcher.rb', line 58

def run(argv)
  conf = {
    dir: "./cache"
  }
  conf = parse_options(argv, conf)

  current_path = current_filename(conf[:dir], conf[:api], conf[:version])
  previous = nil
  if File.readable?(current_path)
    previous = load_file(conf[:api], conf[:version], current_path)
  end

  new_metadata = fetch_discover_api(conf[:api], conf[:version])

  write_current = false
  write_new_metadata = true
  if previous
    if previous.revision == new_metadata.revision
      puts "API #{conf[:api]}_#{conf[:version]}: No Change (revision #{new_metadata.revision})"
      write_new_metadata = false
    else
      if previous.revision < new_metadata.revision
        write_current = true
      end
      puts "API #{conf[:api]}_#{conf[:version]}: revision #{previous.revision} -> #{new_metadata.revision}"
      if conf[:output_file].nil? or conf[:output_file] == "-"
        DiffHash.diff_hash(previous, new_metadata, $stdout)
      else
        open(conf[:output_file], "wb") do |f|
          DiffHash.diff_hash(previous, new_metadata, f)
        end
      end
    end
  else
    puts "New API #{conf[:api]}_#{conf[:version]}"
    write_current = true
  end

  if write_current
    save_file(current_path, new_metadata)
  end
  if write_new_metadata
    save_file(metadata_filename(conf[:dir], new_metadata), new_metadata)
  end
end

#save_file(filepath, api_metadata) ⇒ Object 



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# File 'lib/gcp/api/discovery/watcher.rb', line 25

def save_file(filepath, api_metadata)
  FileUtils.mkdir_p(File.dirname(filepath))
  File.write(filepath, YAML.dump(api_metadata.to_hash))
end