sdk: Implement basic host resource detector

CHANGELOG.md

@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#4154](https://github.com/open-telemetry/opentelemetry-python/pull/4154))
 - sdk: Add support for log formatting
   ([#4137](https://github.com/open-telemetry/opentelemetry-python/pull/4166))
+- sdk: Add Host resource detector
+  ([#4182](https://github.com/open-telemetry/opentelemetry-python/pull/4182))
 - sdk: Implementation of exemplars
   ([#4094](https://github.com/open-telemetry/opentelemetry-python/pull/4094))
 - Implement events sdk

opentelemetry-sdk/pyproject.toml

@@ -68,6 +68,7 @@ console = "opentelemetry.sdk.trace.export:ConsoleSpanExporter"
 otel = "opentelemetry.sdk.resources:OTELResourceDetector"
 process = "opentelemetry.sdk.resources:ProcessResourceDetector"
 os = "opentelemetry.sdk.resources:OsResourceDetector"
+host = "opentelemetry.sdk.resources:_HostResourceDetector"
 
 [project.urls]
 Homepage = "https://github.com/open-telemetry/opentelemetry-python/tree/main/opentelemetry-sdk"

opentelemetry-sdk/src/opentelemetry/sdk/resources/__init__.py

@@ -60,6 +60,7 @@
 import logging
 import os
 import platform
+import socket
 import sys
 import typing
 from json import dumps
@@ -105,6 +106,7 @@
 FAAS_VERSION = ResourceAttributes.FAAS_VERSION
 FAAS_INSTANCE = ResourceAttributes.FAAS_INSTANCE
 HOST_NAME = ResourceAttributes.HOST_NAME
+HOST_ARCH = ResourceAttributes.HOST_ARCH
 HOST_TYPE = ResourceAttributes.HOST_TYPE
 HOST_IMAGE_NAME = ResourceAttributes.HOST_IMAGE_NAME
 HOST_IMAGE_ID = ResourceAttributes.HOST_IMAGE_ID
@@ -471,6 +473,20 @@ def detect(self) -> "Resource":
         )
 
 
+class _HostResourceDetector(ResourceDetector):
+    """
+    The HostResourceDetector detects the hostname and architecture attributes.
+    """
+
+    def detect(self) -> "Resource":
+        return Resource(
+            {
+                HOST_NAME: socket.gethostname(),
+                HOST_ARCH: platform.machine(),
+            }
+        )
+
+
 def get_aggregated_resources(
     detectors: typing.List["ResourceDetector"],
     initial_resource: typing.Optional[Resource] = None,

opentelemetry-sdk/tests/resources/test_resources.py

@@ -28,6 +28,8 @@
     _DEFAULT_RESOURCE,
     _EMPTY_RESOURCE,
     _OPENTELEMETRY_SDK_VERSION,
+    HOST_ARCH,
+    HOST_NAME,
     OS_TYPE,
     OS_VERSION,
     OTEL_RESOURCE_ATTRIBUTES,
@@ -52,6 +54,7 @@
     ProcessResourceDetector,
     Resource,
     ResourceDetector,
+    _HostResourceDetector,
     get_aggregated_resources,
 )
 
@@ -777,3 +780,23 @@ def test_os_detector_solaris(self):
 
         self.assertEqual(resource.attributes[OS_TYPE], "solaris")
         self.assertEqual(resource.attributes[OS_VERSION], "666.4.0.15.0")
+
+
+class TestHostResourceDetector(unittest.TestCase):
+    @patch("socket.gethostname", lambda: "foo")
+    @patch("platform.machine", lambda: "AMD64")
+    def test_host_resource_detector(self):
+        resource = get_aggregated_resources(
+            [_HostResourceDetector()],
+            Resource({}),
+        )
+        self.assertEqual(resource.attributes[HOST_NAME], "foo")
+        self.assertEqual(resource.attributes[HOST_ARCH], "AMD64")
+
+    @patch.dict(
+        environ, {OTEL_EXPERIMENTAL_RESOURCE_DETECTORS: "host"}, clear=True
+    )
+    def test_resource_detector_entry_points_host(self):
+        resource = Resource({}).create()
+        self.assertIn(HOST_NAME, resource.attributes)
+        self.assertIn(HOST_ARCH, resource.attributes)