From 25fe70279ea8eb89b360131e95ce65f6a8696992 Mon Sep 17 00:00:00 2001
From: John Keiser <jkeiser@opscode.com>
Date: Tue, 10 Jun 2014 20:43:16 -0700
Subject: Support port range in :port

---
 .travis.yml             |  4 +++-
 Rakefile                |  6 ++++++
 lib/chef_zero/server.rb | 50 +++++++++++++++++++++++++++++++++++++++++++------
 spec/server_spec.rb     | 28 +++++++++++++++++++++++++++
 4 files changed, 81 insertions(+), 7 deletions(-)
 create mode 100644 spec/server_spec.rb

diff --git a/.travis.yml b/.travis.yml
index 0837536..f3fedc3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ rvm: 1.9.3
 
 gemfile: Gemfile
 
-script: bundle exec rake spec
+script: bundle exec rake pedant
 
 matrix:
   include:
@@ -24,6 +24,8 @@ matrix:
       env: CHEF_FS=true
     - rvm: 2.1.1
       script: bundle exec rake chef_spec
+    - rvm: 2.1.1
+      script: bundle exec rake spec
 
   allow_failures:
     - rvm: 1.8.7
diff --git a/Rakefile b/Rakefile
index 099a270..4599e68 100644
--- a/Rakefile
+++ b/Rakefile
@@ -3,7 +3,13 @@ require 'bundler/gem_tasks'
 
 require 'chef_zero/version'
 
+task :default => :pedant
+
 task :spec do
+  system('rspec spec/*_spec.rb')
+end
+
+task :pedant do
   require File.expand_path('spec/run')
 end
 
diff --git a/lib/chef_zero/server.rb b/lib/chef_zero/server.rb
index 4955282..dbbe473 100644
--- a/lib/chef_zero/server.rb
+++ b/lib/chef_zero/server.rb
@@ -80,6 +80,17 @@ module ChefZero
     # @return [Hash]
     attr_reader :options
 
+    # @return [Integer]
+    def port
+      if @port
+        @port
+      elsif !options[:port].respond_to?(:each)
+        options[:port]
+      else
+        raise "port cannot be determined until server is started"
+      end
+    end
+
     # @return [WEBrick::HTTPServer]
     attr_reader :server
 
@@ -95,9 +106,9 @@ module ChefZero
     #
     def url
       @url ||= if @options[:host].include?(':')
-                 URI("http://[#{@options[:host]}]:#{@options[:port]}").to_s
+                 URI("http://[#{@options[:host]}]:#{port}").to_s
                else
-                 URI("http://#{@options[:host]}:#{@options[:port]}").to_s
+                 URI("http://#{@options[:host]}:#{port}").to_s
                end
     end
 
@@ -153,14 +164,20 @@ module ChefZero
         output = publish.respond_to?(:puts) ? publish : STDOUT
         output.puts <<-EOH.gsub(/^ {10}/, '')
           >> Starting Chef Zero (v#{ChefZero::VERSION})...
+        EOH
+      end
+
+      thread = start_background
+
+      if publish
+        output = publish.respond_to?(:puts) ? publish : STDOUT
+        output.puts <<-EOH.gsub(/^ {10}/, '')
           >> WEBrick (v#{WEBrick::VERSION}) on Rack (v#{Rack.release}) is listening at #{url}
           >> Press CTRL+C to stop
 
         EOH
       end
 
-      thread = start_background
-
       %w[INT TERM].each do |signal|
         Signal.trap(signal) do
           puts "\n>> Stopping Chef Zero..."
@@ -185,8 +202,7 @@ module ChefZero
     #
     def start_background(wait = 5)
       @server = WEBrick::HTTPServer.new(
-        :BindAddress => @options[:host],
-        :Port        => @options[:port],
+        :DoNotListen => true,
         :AccessLog   => [],
         :Logger      => WEBrick::Log.new(StringIO.new, 7),
         :StartCallback => proc {
@@ -195,18 +211,40 @@ module ChefZero
       )
       @server.mount('/', Rack::Handler::WEBrick, app)
 
+      # Pick a port
+      if options[:port].respond_to?(:each)
+        options[:port].each do |port|
+          begin
+            @server.listen(options[:host], port)
+            @port = port
+            break
+          rescue Errno::EADDRINUSE
+          end
+        end
+        if !@port
+          raise Errno::EADDRINUSE, "No port in :port range is available"
+        end
+      else
+        @server.listen(options[:host], options[:port])
+        @port = options[:port]
+      end
+
+      # Start the server in the background
       @thread = Thread.new do
         begin
           Thread.current.abort_on_exception = true
           @server.start
         ensure
+          @port = nil
           @running = false
         end
       end
+
       # Do not return until the web server is genuinely started.
       while !@running && @thread.alive?
         sleep(0.01)
       end
+
       @thread
     end
 
diff --git a/spec/server_spec.rb b/spec/server_spec.rb
new file mode 100644
index 0000000..575c2e2
--- /dev/null
+++ b/spec/server_spec.rb
@@ -0,0 +1,28 @@
+require 'chef_zero/server'
+
+describe ChefZero::Server do
+  context 'with a server bound to port 8889' do
+    before :each do
+      @server = ChefZero::Server.new(:port => 8889)
+      @server.start_background
+    end
+    after :each do
+      @server.stop
+    end
+
+    it 'a second server bound to port 8889 throws EADDRINUSE' do
+      expect { ChefZero::Server.new(:port => 8889).start }.to raise_error Errno::EADDRINUSE
+    end
+
+    it 'a server bound to range 8889-9999 binds to a port > 8889' do
+      server = ChefZero::Server.new(:port => 8889.upto(9999))
+      server.start_background
+      expect(server.port).to be > 8889
+      expect(URI(server.url).port).to be > 8889
+    end
+
+    it 'a server bound to range 8889-8889 throws an exception' do
+      expect { ChefZero::Server.new(:port => 8889.upto(8889)).start_background }.to raise_error Errno::EADDRINUSE
+    end
+  end
+end
-- 
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