Add cloud provider oci (#1780)

ohai cloud fail if the vm is in Oracle Cloud Infrastructure (OCI). This PR add support to this cloud provider to cloud plugin. It also adds OCI detection to the cloud plugin.

Signed-off-by: Renato Covarrubias <rnt@rnt.cl>

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