1 files changed, 69 insertions, 0 deletions
diff --git a/lib/ohai/mixin/oci_metadata.rb b/lib/ohai/mixin/oci_metadata.rb
new file mode 100644
index 00000000..b04243a3
--- /dev/null
+++ b/lib/ohai/mixin/oci_metadata.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+#
+# Author:: Renato Covarrubias (<rnt@rnt.cl>)
+# 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" unless defined?(Net::HTTP)
+
+module Ohai
+  module Mixin
+    module OCIMetadata
+      OCI_METADATA_ADDR = "169.254.169.254"
+      OCI_METADATA_URL = "/opc/v2"
+      CHASSIS_ASSET_TAG_FILE = "/sys/devices/virtual/dmi/id/chassis_asset_tag"
+
+      # fetch the meta content with a timeout and the required header
+      def http_get(uri)
+        conn = Net::HTTP.start(OCI_METADATA_ADDR)
+        conn.read_timeout = 6
+        conn.get(
+          uri,
+          {
+            "Authorization" => "Bearer Oracle",
+            "User-Agent" => "chef-ohai/#{Ohai::VERSION}",
+          }
+        )
+      end
+
+      # parse JSON data from a String to a Hash
+      #
+      # @param [String] response_body json as string to parse
+      #
+      # @return [Hash]
+      def parse_json(response_body)
+        data = String(response_body)
+        parser = FFI_Yajl::Parser.new
+        parser.parse(data)
+      rescue FFI_Yajl::ParseError
+        logger.warn("Mixin OciMetadata: Metadata response is NOT valid JSON")
+        nil
+      end
+
+      # Fetch metadata from api
+      def fetch_metadata(metadata = "instance")
+        response = http_get("#{OCI_METADATA_URL}/#{metadata}")
+        return nil unless response.code == "200"
+
+        if response.code == "200"
+          parse_json(response.body)
+        else
+          logger.warn("Mixin OciMetadata: Received response code #{response.code} requesting metadata")
+          nil
+        end
+      end
+    end
+  end
+end