Add test for metric code generation

semantic-conventions/src/tests/data/jinja/metrics/expected.java

@@ -1,23 +1,29 @@
 package io.opentelemetry.instrumentation.api.metric;
 
-class Units {
+class Metrics {
 
     /**
-    * Use this unit for Metric Instruments recording values
-    * representing fraction of a total.
-    **/
-    public static final String PERCENT = "%";
+     * Measures the duration of inbound HTTP requests
+     *
+     * Instrument: histogram
+     * Unit: s
+     */
+    public static final String HTTP_SERVER_REQUEST_DURATION = "http.server.request.duration";
 
     /**
-    * Use this unit for Metric Instruments recording values
-    * representing time.
-    **/
-    public static final String NANOSECOND = "NS";
+     * Measures the number of concurrent HTTP requests that are currently in-flight
+     *
+     * Instrument: updowncounter
+     * Unit: {request}
+     */
+    public static final String HTTP_SERVER_ACTIVE_REQUESTS = "http.server.active_requests";
 
     /**
-    * Use this unit for Metric Instruments recording values
-    * representing connections.
-    **/
-    public static final String CONNECTIONS = "{connections}";
+     * Measures the size of HTTP request messages
+     *
+     * Instrument: histogram
+     * Unit: By
+     */
+    public static final String HTTP_SERVER_REQUEST_BODY_SIZE = "http.server.request.body.size";
 
 }

semantic-conventions/src/tests/data/jinja/metrics/metrics_template

@@ -0,0 +1,14 @@
+package io.opentelemetry.instrumentation.api.metric;
+
+class Metrics {
+{% for id in semconvs %}{%- if semconvs[id].GROUP_TYPE_NAME == 'metric' %}{% set metric = semconvs[id] %}
+    /**
+     * {{metric.brief | to_doc_brief}}
+     *
+     * Instrument: {{metric.instrument }}
+     * Unit: {{metric.unit }}
+     */
+    public static final String {{metric.metric_name | to_const_name}} = "{{metric.metric_name}}";
+{# Extra line #}
+{%- endif %}{% endfor %}
+}

semantic-conventions/src/tests/data/jinja/units/expected.java

@@ -0,0 +1,23 @@
+package io.opentelemetry.instrumentation.api.metric;
+
+class Units {
+
+    /**
+    * Use this unit for Metric Instruments recording values
+    * representing fraction of a total.
+    **/
+    public static final String PERCENT = "%";
+
+    /**
+    * Use this unit for Metric Instruments recording values
+    * representing time.
+    **/
+    public static final String NANOSECOND = "NS";
+
+    /**
+    * Use this unit for Metric Instruments recording values
+    * representing connections.
+    **/
+    public static final String CONNECTIONS = "{connections}";
+
+}

semantic-conventions/src/tests/data/yaml/metrics/metrics.yaml

@@ -0,0 +1,38 @@
+groups:
+  - id: metric_attributes.http.server
+    type: attribute_group
+    brief: "server attributes."
+    attributes:
+      - id: http.request.method
+        type: string
+        brief: "The HTTP request method."
+        examples: 'GET'
+      - id: http.response.status_code
+        type: string
+        brief: "The HTTP response status code."
+        examples: '200'
+
+  - id: metric.http.server.request.duration
+    type: metric
+    metric_name: http.server.request.duration
+    brief: "Measures the duration of inbound HTTP requests."
+    instrument: histogram
+    unit: "s"
+    extends: metric_attributes.http.server
+
+  - id: metric.http.server.active_requests
+    type: metric
+    metric_name: http.server.active_requests
+    brief: "Measures the number of concurrent HTTP requests that are currently in-flight."
+    instrument: updowncounter
+    unit: "{request}"
+    attributes:
+      - ref: http.request.method
+
+  - id: metric.http.server.request.body.size
+    type: metric
+    metric_name: http.server.request.body.size
+    brief: "Measures the size of HTTP request messages."
+    instrument: histogram
+    unit: "By"
+    extends: metric_attributes.http.server

semantic-conventions/src/tests/semconv/templating/test_code.py

@@ -6,29 +6,45 @@
 
 def test_codegen_units(test_file_path, read_test_file):
     semconv = SemanticConventionSet(debug=False)
-    semconv.parse(test_file_path("yaml", "metrics", "units.yaml"))
+    semconv.parse(test_file_path("yaml", "units", "units.yaml"))
     semconv.finish()
 
-    template_path = test_file_path("jinja", "metrics", "units_template")
+    template_path = test_file_path("jinja", "units", "units_template")
     renderer = CodeRenderer({}, trim_whitespace=False)
 
     output = io.StringIO()
     renderer.render(semconv, template_path, output, None)
     result = output.getvalue()
 
-    expected = read_test_file("jinja", "metrics", "expected.java")
+    expected = read_test_file("jinja", "units", "expected.java")
 
     assert result == expected
 
 
+def test_codegen_metrics(test_file_path, read_test_file):
+    semconv = SemanticConventionSet(debug=False)
+    semconv.parse(test_file_path("yaml", "metrics", "metrics.yaml"))
+    semconv.finish()
+
+    template_path = test_file_path("jinja", "metrics", "metrics_template")
+    renderer = CodeRenderer({}, trim_whitespace=False)
+
+    output = io.StringIO()
+    renderer.render(semconv, template_path, output, None)
+    result = output.getvalue()
+
+    expected = read_test_file("jinja", "metrics", "expected.java")
+
+    assert result == expected
+
 def test_strip_blocks_enabled(test_file_path, read_test_file):
     """Tests that the Jinja whitespace control params are fed to the Jinja environment"""
     semconv = SemanticConventionSet(debug=False)
-    semconv.parse(test_file_path("yaml", "metrics", "units.yaml"))
+    semconv.parse(test_file_path("yaml", "units", "units.yaml"))
     semconv.finish()
 
     template_path = test_file_path(
-        "jinja", "metrics", "units_template_trim_whitespace_enabled"
+        "jinja", "units", "units_template_trim_whitespace_enabled"
     )
     renderer = CodeRenderer({}, trim_whitespace=True)
 
@@ -37,7 +53,7 @@ def test_strip_blocks_enabled(test_file_path, read_test_file):
     result = output.getvalue()
 
     expected = read_test_file(
-        "jinja", "metrics", "expected_trim_whitespace_enabled.java"
+        "jinja", "units", "expected_trim_whitespace_enabled.java"
     )
 
     assert result == expected

semantic-conventions/src/tests/semconv/templating/test_markdown.py

@@ -115,7 +115,7 @@ def test_wrong_duplicate(self):
         self.assertIn("already defined", msg)
 
     def test_units(self):
-        self.check("markdown/metrics_unit/", extra_yaml_dirs=["yaml/metrics/"])
+        self.check("markdown/metrics_unit/", extra_yaml_dirs=["yaml/units/"])
 
     def test_event(self):
         self.check("markdown/event/")