Allow swapping the HTTP stack.

.rubocop_todo.yml

@@ -1,28 +1,40 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2017-10-26 10:54:26 -0400 using RuboCop version 0.47.1.
+# on 2017-10-26 13:04:15 -0400 using RuboCop version 0.47.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
+# Offense count: 5
+# Cop supports --auto-correct.
+# Configuration parameters: AllowUnusedKeywordArguments, IgnoreEmptyMethods.
+Lint/UnusedMethodArgument:
+  Exclude:
+    - 'lib/graphlient/adapters/http/adapter.rb'
+    - 'lib/graphlient/adapters/http/http_adapter.rb'
+
 # Offense count: 1
 Lint/UselessAssignment:
   Exclude:
     - 'spec/graphlient/client_query_spec.rb'
 
-# Offense count: 11
+# Offense count: 1
+Metrics/AbcSize:
+  Max: 19
+
+# Offense count: 12
 # Configuration parameters: CountComments, ExcludedMethods.
 Metrics/BlockLength:
   Max: 185
 
-# Offense count: 20
+# Offense count: 25
 # Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https
 Metrics/LineLength:
   Max: 177
 
-# Offense count: 2
+# Offense count: 3
 # Configuration parameters: CountComments.
 Metrics/MethodLength:
   Max: 12
@@ -34,12 +46,14 @@ Style/ClassAndModuleChildren:
   Exclude:
     - 'spec/graphlient/static_client_query_spec.rb'
 
-# Offense count: 6
+# Offense count: 8
 Style/Documentation:
   Exclude:
     - 'spec/**/*'
     - 'test/**/*'
-    - 'lib/graphlient/adapters/faraday_adapter.rb'
+    - 'lib/graphlient/adapters/http/adapter.rb'
+    - 'lib/graphlient/adapters/http/faraday_adapter.rb'
+    - 'lib/graphlient/adapters/http/http_adapter.rb'
     - 'lib/graphlient/client.rb'
     - 'lib/graphlient/errors/error.rb'
     - 'lib/graphlient/errors/graphql.rb'

CHANGELOG.md

@@ -1,6 +1,7 @@
 ### 0.0.9 (Next)
 
 * [#28](https://github.com/ashkan18/graphlient/pull/28): Raise errors in `execute`, not only `query` - [@dblock](https://github.com/dblock).
+* [#29](https://github.com/ashkan18/graphlient/pull/29): Added `Graphlient::Adapters::HTTP::HTTPAdapter` that replaces Faraday with `Net::HTTP` - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 0.0.8 (10/26/2017)

README.md

@@ -265,9 +265,17 @@ query.to_s
 # "\nquery{\n  invoice(id: 10){\n    line_items\n    }\n  }\n"
 ```
 
+### Swapping the HTTP Stack
+
+You can swap the default Faraday adapter for `Net::HTTP`.
+
+```ruby
+client = Graphlient::Client.new('https://test-graphql.biz/graphql', http: Graphlient::Adapters::HTTP::HTTPAdapter)
+```
+
 ### Testing with Graphlient and RSpec
 
-Use Graphlient inside your RSpec tests in a Rails application or with `Rack::Test`, no more messy HTTP POSTs.
+Use Graphlient inside your RSpec tests in a Rails application or with `Rack::Test` against your actual application.
 
 ```ruby
 require 'spec_helper'
@@ -307,6 +315,25 @@ describe App do
 end
 ```
 
+Alternately you can `stub_request` with Webmock.
+
+```ruby
+describe App do
+  let(:client) { Graphlient::Client.new('http://example.com/graphql') }
+
+  before do
+    stub_request(:post, url).to_return(
+      status: 200,
+      body: DummySchema.execute(GraphQL::Introspection::INTROSPECTION_QUERY).to_json
+    )
+  end
+
+  it 'retrieves schema' do
+    expect(client.schema).to be_a GraphQL::Schema
+  end
+end
+```
+
 ## License
 
 MIT License, see [LICENSE](LICENSE)

lib/graphlient.rb

@@ -1,5 +1,7 @@
+require 'graphql/client'
 require 'graphlient/version'
 require 'graphlient/extensions'
 require 'graphlient/errors'
 require 'graphlient/query'
+require 'graphlient/adapters'
 require 'graphlient/client'

lib/graphlient/adapters.rb

@@ -0,0 +1 @@
+require_relative 'adapters/http'

lib/graphlient/adapters/http.rb

@@ -0,0 +1,3 @@
+require_relative 'http/adapter'
+require_relative 'http/faraday_adapter'
+require_relative 'http/http_adapter'

lib/graphlient/adapters/http/adapter.rb

@@ -0,0 +1,23 @@
+module Graphlient
+  module Adapters
+    module HTTP
+      class Adapter
+        attr_accessor :url, :options
+
+        def initialize(url, options = {}, &_block)
+          @url = url
+          @options = options.dup if options
+          yield self if block_given?
+        end
+
+        def headers
+          options[:headers] if options
+        end
+
+        def execute(document:, operation_name:, variables:, context:)
+          raise NotImplementedError
+        end
+      end
+    end
+  end
+end

lib/graphlient/adapters/http/faraday_adapter.rb

@@ -0,0 +1,37 @@
+require 'faraday'
+require 'faraday_middleware'
+
+module Graphlient
+  module Adapters
+    module HTTP
+      class FaradayAdapter < Adapter
+        def execute(document:, operation_name:, variables:, context:)
+          response = connection.post do |req|
+            req.headers.merge!(context[:headers] || {})
+            req.body = {
+              query: document.to_query_string,
+              operationName: operation_name,
+              variables: variables.to_json
+            }.to_json
+          end
+          response.body
+        rescue Faraday::ClientError => e
+          raise Graphlient::Errors::Server.new(e.message, e)
+        end
+
+        def connection
+          @connection ||= Faraday.new(url: url, headers: headers) do |c|
+            c.use Faraday::Response::RaiseError
+            c.request :json
+            c.response :json
+            if block_given?
+              yield c
+            else
+              c.use Faraday::Adapter::NetHttp
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/graphlient/adapters/http/http_adapter.rb

@@ -0,0 +1,39 @@
+require 'graphql/client/http'
+
+module Graphlient
+  module Adapters
+    module HTTP
+      class HTTPAdapter < Adapter
+        attr_reader :uri
+
+        def execute(document:, operation_name: nil, variables: {}, context: {})
+          request = Net::HTTP::Post.new(url)
+
+          request['Accept'] = 'application/json'
+          request['Content-Type'] = 'application/json'
+          headers&.each { |name, value| request[name] = value }
+
+          body = {}
+          body['query'] = document.to_query_string
+          body['variables'] = variables if variables.any?
+          body['operationName'] = operation_name if operation_name
+          request.body = JSON.generate(body)
+
+          response = connection.request(request)
+          raise Graphlient::Errors::Server.new("the server responded with status #{response.code}", response) unless response.is_a?(Net::HTTPOK)
+          JSON.parse(response.body)
+        end
+
+        def uri
+          @uri ||= URI(url)
+        end
+
+        def connection
+          Net::HTTP.new(uri.host, uri.port).tap do |client|
+            client.use_ssl = uri.scheme == 'https'
+          end
+        end
+      end
+    end
+  end
+end

lib/graphlient/client.rb

@@ -1,6 +1,3 @@
-require 'graphql/client'
-require 'graphlient/adapters/faraday_adapter'
-
 module Graphlient
   class Client
     attr_accessor :uri, :options
@@ -40,8 +37,12 @@ def query(query_or_variables = nil, variables = nil, &block)
       end
     end
 
+    def http_adapter_class
+      options[:http] || Adapters::HTTP::FaradayAdapter
+    end
+
     def http(&block)
-      @http ||= Adapters::FaradayAdapter.new(@url, headers: @options[:headers], &block)
+      @http ||= http_adapter_class.new(@url, headers: @options[:headers], &block)
     end
 
     def schema

spec/graphlient/adapters/faraday_adapter_spec.rb → spec/graphlient/adapters/http/faraday_adapter_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Graphlient::Adapters::FaradayAdapter do
+describe Graphlient::Adapters::HTTP::FaradayAdapter do
   let(:app) { Object.new }
 
   context 'with a custom middleware' do
@@ -41,4 +41,20 @@
       expect(client.http.headers).to eq headers
     end
   end
+
+  context 'default' do
+    let(:url) { 'http://example.com/graphql' }
+    let(:client) { Graphlient::Client.new(url) }
+
+    before do
+      stub_request(:post, url).to_return(
+        status: 200,
+        body: DummySchema.execute(GraphQL::Introspection::INTROSPECTION_QUERY).to_json
+      )
+    end
+
+    it 'retrieves schema' do
+      expect(client.schema).to be_a GraphQL::Schema
+    end
+  end
 end

spec/graphlient/adapters/http/http_adapter_spec.rb

@@ -0,0 +1,41 @@
+require 'spec_helper'
+
+describe Graphlient::Adapters::HTTP::HTTPAdapter do
+  let(:app) { Object.new }
+
+  context 'with custom url and headers' do
+    let(:url) { 'http://example.com/graphql' }
+    let(:headers) { { 'Foo' => 'bar' } }
+    let(:client) do
+      Graphlient::Client.new(url, headers: headers, http: Graphlient::Adapters::HTTP::HTTPAdapter)
+    end
+
+    it 'sets adapter' do
+      expect(client.http).to be_a Graphlient::Adapters::HTTP::HTTPAdapter
+    end
+
+    it 'sets url' do
+      expect(client.http.url).to eq url
+    end
+
+    it 'sets headers' do
+      expect(client.http.headers).to eq headers
+    end
+  end
+
+  context 'default' do
+    let(:url) { 'http://example.com/graphql' }
+    let(:client) { Graphlient::Client.new(url, http: Graphlient::Adapters::HTTP::HTTPAdapter) }
+
+    before do
+      stub_request(:post, url).to_return(
+        status: 200,
+        body: DummySchema.execute(GraphQL::Introspection::INTROSPECTION_QUERY).to_json
+      )
+    end
+
+    it 'retrieves schema' do
+      expect(client.schema).to be_a GraphQL::Schema
+    end
+  end
+end