Class: Tml::Api::Client

Inherits:
Base
  • Object
show all
Defined in:
lib/tml/api/client.rb

Constant Summary collapse

API_PATH = 
'/v1'

Instance Attribute Summary

Attributes inherited from Base

#attributes

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

attributes, belongs_to, has_many, #hash_value, hash_value, #initialize, #method_missing, #to_hash, #update_attributes

Constructor Details

This class inherits a constructor from Tml::Base

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Tml::Base

Class Method Details

.error?(data) ⇒ Boolean

checks if there are any API errors



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# File 'lib/tml/api/client.rb', line 68

def self.error?(data)
  not data['error'].nil?
end

Instance Method Details

#access_token ⇒ Object

access token



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# File 'lib/tml/api/client.rb', line 164

def access_token
  application.token
end

#api(path, params = {}, opts = {}) ⇒ Object

checks mode and cache, and fetches data



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# File 'lib/tml/api/client.rb', line 187

def api(path, params = {}, opts = {})
  # inline mode should always use API calls
  if live_api_request?
    return process_response(execute_request(path, params, opts), opts)
  end

  return unless cache_enabled?(opts)

  # ensure the cache version is not outdated
  verify_cache_version

  return if Tml.cache.version.invalid?

  # get request uses local cache, then CDN
  data = Tml.cache.fetch(opts[:cache_key]) do
    Tml.cache.read_only? ? nil : get_from_cdn(opts[:cache_key])
  end

  process_response(data, opts)
end

#cache_enabled?(opts) ⇒ Boolean

checks if cache is enable



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# File 'lib/tml/api/client.rb', line 178

def cache_enabled?(opts)
  # only gets ever get cached
  return false unless opts[:method] == :get
  return false if opts[:cache_key].nil?
  return false unless Tml.cache.enabled?
  true
end

#cdn_connection ⇒ Object

cdn_connection



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# File 'lib/tml/api/client.rb', line 109

def cdn_connection
  @cdn_connection ||= Faraday.new(:url => application.cdn_host) do |faraday|
    faraday.request(:url_encoded)               # form-encode POST params
    faraday.adapter(Faraday.default_adapter)    # make requests with Net::HTTP
  end
end

#connection ⇒ Object

API connection



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# File 'lib/tml/api/client.rb', line 73

def connection
  @connection ||= Faraday.new(:url => application.host) do |faraday|
    faraday.request(:url_encoded)               # form-encode POST params
    # faraday.response :logger                  # log requests to STDOUT
    faraday.adapter(Faraday.default_adapter)    # make requests with Net::HTTP
  end
end

#delete(path, params = {}, opts = {}) ⇒ Object

delete from API



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# File 'lib/tml/api/client.rb', line 63

def delete(path, params = {}, opts = {})
  api(path, params, opts.merge(:method => :delete))
end

#execute_request(path, params = {}, opts = {}) ⇒ Object

execute API request

Raises:



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# File 'lib/tml/api/client.rb', line 246

def execute_request(path, params = {}, opts = {})
  response = nil
  error = nil

  path = prepare_api_path(path)

  params = params.merge(:access_token => access_token, :app_id => application.key)

  @compressed = false
  trace_api_call(path, params, opts.merge(:host => application.host)) do
    begin
      if opts[:method] == :post
        response = connection.post(path, params)
      elsif opts[:method] == :put
        response = connection.put(path, params)
      elsif opts[:method] == :delete
        response = connection.delete(path, params)
      else
        response = connection.get do |request|
          @compressed = true
          prepare_request(request, path, params)
        end
      end
    rescue Exception => ex
      Tml.logger.error("Failed to execute request: #{ex.message[0..255]}")
      error = ex
      nil
    end
  end
  raise Tml::Exception.new("Error: #{error}") if error

  if response.status >= 500 and response.status < 600
    raise Tml::Exception.new("Error: #{response.body}")
  end

  if @compressed and (not opts[:uncompressed])
    compressed_data = response.body
    return if compressed_data.nil? or compressed_data == ''

    data = Zlib::GzipReader.new(StringIO.new(compressed_data.to_s)).read
    Tml.logger.debug("Compressed: #{compressed_data.length} Uncompressed: #{data.length}")
  else
    data = response.body
  end

  return data if opts[:raw]

  begin
    data = JSON.parse(data)
  rescue Exception => ex
    raise Tml::Exception.new("Failed to parse response: #{ex.message[0..255]}")
  end

  if data.is_a?(Hash) and not data['error'].nil?
    raise Tml::Exception.new("Error: #{data['error']}")
  end

  data
end

#get(path, params = {}, opts = {}) ⇒ Object

get from API



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# File 'lib/tml/api/client.rb', line 48

def get(path, params = {}, opts = {})
  api(path, params, opts.merge(:method => :get))
end

#get_cache_version ⇒ Object

get cache version from CDN



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# File 'lib/tml/api/client.rb', line 82

def get_cache_version
  data = get_from_cdn('version', {t: Time.now.to_i}, {public: true, uncompressed: true})

  unless data
    Tml.logger.debug('No releases have been published yet')
    return '0'
  end

  data['version']
end

#get_from_cdn(key, params = {}, opts = {}) ⇒ Object

get from the CDN



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# File 'lib/tml/api/client.rb', line 117

def get_from_cdn(key, params = {}, opts = {})
  if Tml.cache.version.invalid? and key != 'version'
    return nil
  end

  response = nil
  cdn_path = "/#{application.key}"

  if key == 'version'
    cdn_path += "/#{key}.json"
  else
    cdn_path += "/#{Tml.cache.version.to_s}/#{key}.json#{opts[:uncompressed] ? '' : '.gz'}"
  end

  trace_api_call(cdn_path, params, opts.merge(:host => application.cdn_host)) do
    begin
      response = cdn_connection.get do |request|
        prepare_request(request, cdn_path, params)
      end
    rescue Exception => ex
      Tml.logger.error("Failed to execute request: #{ex.message[0..255]}")
      return nil
    end
  end
  return if response.status >= 500 and response.status < 600
  return if response.body.nil? or response.body == '' or response.body.match(/xml/)

  compressed_data = response.body
  return if compressed_data.nil? or compressed_data == ''

  data = compressed_data

  unless opts[:uncompressed]
    data = Zlib::GzipReader.new(StringIO.new(compressed_data.to_s)).read
    Tml.logger.debug("Compressed: #{compressed_data.length} Uncompressed: #{data.length}")
  end

  begin
    data = JSON.parse(data)
  rescue Exception => ex
    return nil
  end

  data
end

#live_api_request? ⇒ Boolean

should the API go to live server



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# File 'lib/tml/api/client.rb', line 169

def live_api_request?
  # if no access token, never use live mode
  return false if access_token.nil?

  # if block is specifically asking for it or inline mode is activated
  Tml.session.inline_mode? or Tml.session.block_option(:live)
end

#object_class(opts) ⇒ Object

get object class from options



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# File 'lib/tml/api/client.rb', line 307

def object_class(opts)
  return unless opts[:class]
  opts[:class].is_a?(String) ? opts[:class].constantize : opts[:class]
end

#paginate(path, params = {}, opts = {}) ⇒ Object

paginates through API results



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# File 'lib/tml/api/client.rb', line 209

def paginate(path, params = {}, opts = {})
  data = get(path, params, opts.merge({'raw' => true}))

  while data
    if data['results'].is_a?(Array)
      data['results'].each do |result|
        yield(result)
      end
    else
      yield(data['results'])
    end

    if data['pagination'] and data['pagination']['links']['next']
      data = get(data['pagination']['links']['next'], {}, opts.merge({'raw' => true}))
    else
      data = nil
    end
  end
end

#post(path, params = {}, opts = {}) ⇒ Object

post to API



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# File 'lib/tml/api/client.rb', line 53

def post(path, params = {}, opts = {})
  api(path, params, opts.merge(:method => :post))
end

#prepare_api_path(path) ⇒ Object

prepares API path



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# File 'lib/tml/api/client.rb', line 230

def prepare_api_path(path)
  return path if path.match(/^https?:\/\//)
  "#{API_PATH}#{path[0] == '/' ? '' : '/'}#{path}"
end

#prepare_request(request, path, params) ⇒ Object

prepares request



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# File 'lib/tml/api/client.rb', line 236

def prepare_request(request, path, params)
  request.options.timeout             = Tml.config.api_client[:timeout]
  request.options.open_timeout        = Tml.config.api_client[:open_timeout]
  request.headers['User-Agent']       = "tml-ruby v#{Tml::VERSION} (Faraday v#{Faraday::VERSION})"
  request.headers['Accept']           = 'application/json'
  request.headers['Accept-Encoding']  = 'gzip, deflate'
  request.url(path, params)
end

#process_response(data, opts) ⇒ Object

process API response



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# File 'lib/tml/api/client.rb', line 313

def process_response(data, opts)
  return nil if data.nil?
  return data if opts[:raw] or opts[:raw_json]

  if data.is_a?(Hash) and data['results']
    #Tml.logger.debug("received #{data['results'].size} result(s)")
    return data['results'] unless object_class(opts)
    objects = []
    data['results'].each do |data|
      objects << object_class(opts).new(data.merge(opts[:attributes] || {}))
    end
    return objects
  end

  return data unless object_class(opts)
  object_class(opts).new(data.merge(opts[:attributes] || {}))
end

#put(path, params = {}, opts = {}) ⇒ Object

put to API



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# File 'lib/tml/api/client.rb', line 58

def put(path, params = {}, opts = {})
  api(path, params, opts.merge(:method => :put))
end

#results(path, params = {}, opts = {}) ⇒ Object

get results from API



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# File 'lib/tml/api/client.rb', line 43

def results(path, params = {}, opts = {})
  get(path, params, opts)['results']
end

#to_query(hash) ⇒ Object

convert params to query



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# File 'lib/tml/api/client.rb', line 332

def to_query(hash)
  query = []
  hash.each do |key, value|
    query << "#{key.to_s}=#{value.to_s}"
  end
  query.join('&')
end

#trace_api_call(path, params, opts = {}) ⇒ Object

trace api call for logging



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# File 'lib/tml/api/client.rb', line 341

def trace_api_call(path, params, opts = {})
  if Tml.config.logger[:secure]
    [:access_token].each do |param|
      params = params.merge(param => "##filtered##") if params[param]
    end
  end

  path = "#{path[0] == '/' ? '' : '/'}#{path}"

  if opts[:method] == :post
    Tml.logger.debug("post: #{opts[:host]}#{path}")
  else
    if params.any?
      Tml.logger.debug("get: #{opts[:host]}#{path}?#{to_query(params)}")
    else
      Tml.logger.debug("get: #{opts[:host]}#{path}")
    end
  end

  t0 = Time.now
  if block_given?
    ret = yield
  end
  t1 = Time.now

  Tml.logger.debug("call took #{t1 - t0} seconds")
  ret
end

#verify_cache_version ⇒ Object

verify cache version



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# File 'lib/tml/api/client.rb', line 94

def verify_cache_version
  return if Tml.cache.version.defined?

  current_version = Tml.cache.version.fetch

  if current_version == 'undefined'
    Tml.cache.version.store(get_cache_version)
  else
    Tml.cache.version.set(current_version)
  end

  Tml.logger.info("Cache Version: #{Tml.cache.version}")
end