add: request api data and topic group

app/services/forum/client_service.rb

@@ -0,0 +1,94 @@
+class Forum::ClientService < ApplicationService
+  attr_reader :url, :params
+
+  PAGINATE_DEFAULT_PAGE  = 1
+  PAGINATE_DEFAULT_LIMIT = 20
+
+  def initialize(options={})
+    @url      = options[:url]
+    @params   = options[:params]
+  end
+
+  def get(url, params={})
+    conn(params).get do |req|
+      req.url full_url(url, 'get')
+      params.except(:token).each_pair do |key, value|
+        req.params["#{key}"] = value
+      end
+    end
+
+    # response.headers.each do |k,v|
+    #   puts "#{k}:#{v}"
+    # end #=> 响应头
+  end
+
+  private
+  def conn(auth={})
+    @client ||= begin
+      Faraday.new(url: domain) do |req|
+        req.request :url_encoded
+        req.headers['Content-Type'] = 'application/json'
+        req.response :logger # 显示日志
+        req.adapter Faraday.default_adapter
+      end
+    end
+    @client
+  end
+
+  def base_url
+    Forum.forum_config[:base_url]
+  end
+
+  def domain
+    Forum.forum_config[:domain]
+  end
+
+  def api_url
+    [domain, base_url].join('')
+  end
+
+  def full_url(api_rest, action='post')
+    url = [api_url, api_rest].join('').freeze
+    url = action === 'get' ? url : URI.escape(url)
+    url = URI.escape(url) unless url.ascii_only?
+    puts "[forum] request url: #{url}"
+    return url
+  end
+
+  def render_response(response)
+    status = response.status
+    body = response&.body
+
+    # log_error(status, body)
+
+    body, message = get_body_by_status(status, body)
+
+    [status, message, body]
+  end
+
+  def get_body_by_status(status, body)
+    body, message =
+      case status
+      when 401 then [nil, "401"]
+      when 404 then [nil, "404"]
+      when 403 then [nil, "403"]
+      when 500 then [nil, "500"]
+      else
+        if body.present?
+          body = JSON.parse(body)
+          fix_body(body)
+        else
+          nil
+        end
+      end
+
+    [body, message]
+  end
+
+  def fix_body(body)
+    return [body, nil] if body.is_a?(Array) || body.is_a?(Hash)
+
+    body['message'].blank? ? [body, nil] : [nil, body['message']]
+  end
+
+end

app/services/forum/memos/get_service.rb

@@ -0,0 +1,21 @@
+class Forum::Memos::GetService < Forum::ClientService
+  attr_reader :memo_id
+
+  def initialize(memo_id)
+    @memo_id = memo_id 
+  end
+
+  def call 
+    response = get(url)
+    code, message, body = render_response(response)
+    if code == 200 && body["status"] == 0
+      return body 
+    else 
+      return nil
+    end
+  end
+
+  def url 
+    "/memos/#{memo_id}.json".freeze
+  end
+end