Setup DigitalOcean plugin to use Metadata API

1 files changed, 73 insertions, 0 deletions

diff --git a/lib/ohai/mixin/do_metadata.rb b/lib/ohai/mixin/do_metadata.rb
new file mode 100644
index 00000000..ec4a08a8
--- /dev/null
+++ b/lib/ohai/mixin/do_metadata.rb
@@ -0,0 +1,73 @@
+
+# Author:: Dylan Page (<dpage@digitalocean.com>)
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require 'net/http'
+require 'socket'
+
+module Ohai
+  module Mixin
+    module DOMetadata
+
+      DO_METADATA_ADDR = "169.254.269.254" unless defined?(DO_METADATA_ADDR)
+      DO_METADATA_URL = "/metadata/v1.json" unless defined?(DO_METADATA_URL)
+
+      def can_metadata_connect?(addr, port, timeout=2)
+        t = Socket.new(Socket::Constants::AF_INET, Socket::Constants::SOCK_STREAM, 0)
+        saddr = Socket.pack_sockaddr_in(port, addr)
+        connected = false
+
+        begin
+          t.connect_nonblock(saddr)
+        rescue Errno::EINPROGRESS
+          r,w,e = IO::select(nil,[t],nil,timeout)
+          if !w.nil?
+            connected = true
+          else
+            begin
+              t.connect_nonblock(saddr)
+            rescue Errno::EISCONN
+              t.close
+              connected = true
+            rescue SystemCallError
+            end
+          end
+        rescue SystemCallError
+        end
+        Ohai::Log.debug("DOMetadata mixin: can_metadata_connect? == #{connected}")
+        connected
+      end
+
+      def http_client
+        Net::HTTP.start(DO_METADATA_ADDR).tap {|h| h.read_timeout = 6}
+      end
+
+      def fetch_metadata()
+        uri = "#{DO_METADATA_URL}"
+        response = http_client.get(uri)
+        case response.code
+        when "200"
+          response.body
+        when "404"
+          Ohai::Log.debug("Encountered 404 response retreiving Digital Ocean metadata: #{uri} ; continuing.")
+          Hash.new
+        else
+          raise "Encountered error retrieving Digital Ocean metadata (#{uri} returned #{response.code} response)"
+        end
+      end
+
+    end
+  end
+end