adding the isbn_search client

backend/Gemfile

@@ -29,6 +29,7 @@ gem 'jbuilder', '~> 2.7'
 gem 'bootsnap', '>= 1.4.4', require: false
 
 gem 'sidekiq'
+gem 'excon'
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console

backend/Gemfile.lock

@@ -70,6 +70,7 @@ GEM
     crass (1.0.6)
     diff-lcs (1.4.4)
     erubi (1.10.0)
+    excon (0.85.0)
     ffi (1.15.4)
     globalid (0.5.2)
       activesupport (>= 5.0)
@@ -203,6 +204,7 @@ PLATFORMS
 DEPENDENCIES
   bootsnap (>= 1.4.4)
   byebug
+  excon
   jbuilder (~> 2.7)
   listen (~> 3.3)
   pg (~> 1.1)

backend/app/controllers/books_controller.rb

@@ -21,11 +21,11 @@ class BooksController < ApplicationController
 
   # POST /books or /books.json
   def create
-    @book = Book.new(book_params)
+    @book = Book.new(book_info)
 
     respond_to do |format|
       if @book.save
-        NotifyWorker.perform_async(book_params[:title], book_params[:author])
+        NotifyWorker.perform_async(book_info[:title], book_info[:author])
         format.html { redirect_to @book, notice: "Book was successfully created." }
         format.json { render :show, status: :created, location: @book }
       else
@@ -38,7 +38,7 @@ class BooksController < ApplicationController
   # PATCH/PUT /books/1 or /books/1.json
   def update
     respond_to do |format|
-      if @book.update(book_params)
+      if @book.update(book_info)
         format.html { redirect_to @book, notice: "Book was successfully updated." }
         format.json { render :show, status: :ok, location: @book }
       else
@@ -58,13 +58,16 @@ class BooksController < ApplicationController
   end
 
   private
-    # Use callbacks to share common setup or constraints between actions.
-    def set_book
-      @book = Book.find(params[:id])
-    end
+  # Use callbacks to share common setup or constraints between actions.
+  def set_book
+    @book = Book.find(params[:id])
+  end
 
-    # Only allow a list of trusted parameters through.
-    def book_params
-      params.require(:book).permit(:title, :author, :description)
-    end
+  def isbn_params
+    params.require(:book).permit(:isbn)
+  end
+
+  def book_info
+    Internal::IsbnSearch::Client.new.get(isbn_params[:isbn])
+  end
 end

backend/app/views/books/_form.html.erb

@@ -12,18 +12,8 @@
   <% end %>
 
   <div class="field">
-    <%= form.label :title %>
-    <%= form.text_field :title %>
-  </div>
-
-  <div class="field">
-    <%= form.label :author %>
-    <%= form.text_field :author %>
-  </div>
-
-  <div class="field">
-    <%= form.label :description %>
-    <%= form.text_field :description %>
+    <%= form.label :isbn %>
+    <%= form.text_field :isbn %>
   </div>
 
   <div class="actions">

backend/config/application.rb

@@ -24,6 +24,8 @@ module Backend
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 6.1
 
+    config.autoload_paths += %W(#{config.root}/lib)
+
     # Configuration for the application, engines, and railties goes here.
     #
     # These settings can be overridden in specific environments using the files

backend/docker-compose.yml

@@ -13,6 +13,12 @@ services:
     image: redis:6.2.5
     ports:
       - "6379:6379"
+  isbn_search:
+    build: ../isbn-search/
+    environment:
+      - PORT=3001
+    ports:
+      - "3001:3001"
 volumes:
   data-postgres:
     driver: local

backend/lib/internal/isbn_search/client.rb

@@ -0,0 +1,26 @@
+module Internal
+  module IsbnSearch
+    class Client
+      def initialize
+        @port = ENV.fetch('ISBN_SEARCH_PORT', 3001)
+        @host = ENV.fetch('ISBN_SEARCH_HOST', '0.0.0.0')
+        @path = 'isbn/'
+      end
+
+      def get(isbn)
+        response = Excon.get(url_for(isbn))
+        if response.status == 200
+          JSON.parse(response.body)
+        else
+          nil
+        end
+      end
+
+      private
+
+      def url_for(isbn)
+        "http://#{@host}:#{@port}/#{@path}/#{isbn}"
+      end
+    end
+  end
+end