Add fully support to export traces with http

docs/config-www.rst

@@ -44,7 +44,7 @@ from the built-in web server, run the following::
 
 Using the default configuration, the web UI should now be reachable on port
 5000. By default, the NIPAP web UI will look for nipap.conf in /etc/nipap. The
-path can be changed setting the environment variable NIPPA_CONFIG_PATH as
+path can be changed setting the environment variable NIPAP_CONFIG_PATH as
 such::
 
       export NIPAP_CONFIG_PATH=~/.local/etc/nipap/nipap.conf

nipap-www/nipapwww/__init__.py

@@ -12,7 +12,7 @@ def create_app(test_config=None):
     # dependencies installed. Relevant during initial package build.
     import os
     from flask import Flask, redirect, url_for
-    from nipap.nipapconfig import NipapConfig
+    from nipap.nipapconfig import NipapConfig, NipapConfigError
     import pynipap
 
     # create and configure the app
@@ -43,7 +43,14 @@ def create_app(test_config=None):
         try:
             import nipap.tracing
             from opentelemetry.instrumentation.wsgi import OpenTelemetryMiddleware
-            nipap.tracing.init_tracing("nipap-www", nipap_config.get("tracing", "otlp_grpc_endpoint"))
+
+            if nipap_config.has_option("tracing", "otlp_grpc_endpoint"):
+                nipap.tracing.init_tracing("nipap-www", nipap_config.get("tracing", "otlp_grpc_endpoint"))
+            elif nipap_config.has_option("tracing", "otlp_http_endpoint"):
+                nipap.tracing.init_tracing("nipap-www", nipap_config.get("tracing", "otlp_http_endpoint"), False)
+            else:
+                raise NipapConfigError("Tracing enabled but no OTLP endpoint configured")
+
             app.wsgi_app = OpenTelemetryMiddleware(app.wsgi_app)
         except KeyError:
             pass

nipap/nipap.conf.dist

@@ -204,7 +204,7 @@ secret_key = {{WWW_SECRET_KEY}}
 #welcome_message = Welcome to NIPAP at COMPANY. Please login using your XYZ credentials.
 # Enable OpenTelemetry tracing by uncommenting section.
 # [tracing]
-# Specify OTLP GRPC endpoint. Used to send traces to OpenTelemetry Collector
+# Specify OTLP GRPC endpoint. Used to send traces to OpenTelemetry Collector. Has precedence over OTLP HTTP endpoint.
 # otlp_grpc_endpoint=http://opentelemetry-collector:4317
-# Specify OTLP HTTP endpoint. Used when proxying traces to OpenTelemetry-Collector from nipap-cli
+# Specify OTLP HTTP endpoint. Used to send traces to OpenTelemetry Collector but also used when proxying traces to OpenTelemetry-Collector from nipap-cli
 # otlp_http_endpoint=http://opentelemetry-collector:4318/v1/traces

nipap/nipap/tracing.py

@@ -10,17 +10,21 @@
     from opentelemetry.sdk.resources import SERVICE_NAME, Resource
     from opentelemetry.sdk.trace import TracerProvider
     from opentelemetry.sdk.trace.export import BatchSpanProcessor
+    import opentelemetry.exporter.otlp.proto.http.trace_exporter
     from requests import post
 
     tracer = trace.get_tracer("nipap")
 
-    def init_tracing(service_name, endpoint):
+    def init_tracing(service_name, endpoint, use_grpc=True):
         resource = Resource(attributes={
             SERVICE_NAME: service_name
         })
 
         provider = TracerProvider(resource=resource)
-        processor = BatchSpanProcessor(OTLPSpanExporter(endpoint=endpoint))
+        if use_grpc:
+            processor = BatchSpanProcessor(OTLPSpanExporter(endpoint=endpoint))
+        else:
+            processor = BatchSpanProcessor(opentelemetry.exporter.otlp.proto.http.trace_exporter.OTLPSpanExporter(endpoint=endpoint))
         provider.add_span_processor(processor)
         trace.set_tracer_provider(provider)
 

nipap/nipapd

@@ -233,15 +233,20 @@ if __name__ == '__main__':
             from nipap.tracing import init_tracing, setup
             from opentelemetry.instrumentation.psycopg2 import Psycopg2Instrumentor
             from opentelemetry.instrumentation.flask import FlaskInstrumentor
-            otlp_grpc_endpoint = cfg.get("tracing", "otlp_grpc_endpoint")
-            init_tracing("nipapd", otlp_grpc_endpoint)
+
+            if cfg.has_option("tracing", "otlp_grpc_endpoint"):
+                init_tracing("nipapd", cfg.get("tracing", "otlp_grpc_endpoint"))
+            elif cfg.has_option("tracing", "otlp_http_endpoint"):
+                init_tracing("nipapd", cfg.get("tracing", "otlp_http_endpoint"), False)
+            else:
+                raise NipapConfigError("Tracing enabled but no OTLP endpoint configured")
+
             FlaskInstrumentor.instrument_app(app, excluded_urls="/v1/traces")
             Psycopg2Instrumentor().instrument(enable_commenter=True, commenter_options={})
 
             # Configure proxy of traces from nipap-cli to collector
             try:
-                otlp_http_endpoint = cfg.get("tracing", "otlp_http_endpoint")
-                setup(app, otlp_http_endpoint)
+                setup(app, cfg.get("tracing", "otlp_http_endpoint"))
             except configparser.NoOptionError:
                 pass
             logger.debug('Tracing is enabled')