feat: Configure logging (#37)

## Which problem is this PR solving?
Setups logging when using the distro. Log level can be set either using
`OTEL_LOG_LEVEL` environment variable or the `log_level` option.

- Closes #36 

## Short description of the changes
- Setups and registers a logger during HoneycombOptions init
- Use logger to indicate Honeycomb distro is being used during
`configure_opentelemetry`
- Removes left over debug log in a test

## How to verify that this has the expected result
Log entires are printed out at the configured log level.

Note: This is based on the follow PR, and will auto update once it's
merged
- #27

Co-authored-by: Robb Kidd <robbkidd@honeycomb.io>

honeycomb/opentelemetry/distro.py

@@ -5,14 +5,18 @@
 from honeycomb.opentelemetry.options import HoneycombOptions
 from honeycomb.opentelemetry.resource import create_resource
 from honeycomb.opentelemetry.trace import create_tracer_provider
+from logging import getLogger
 from opentelemetry.instrumentation.distro import BaseDistro
 from opentelemetry.metrics import set_meter_provider
 from opentelemetry.trace import set_tracer_provider
 
+_logger = getLogger(__name__)
+
 
 def configure_opentelemetry(
     options: HoneycombOptions = HoneycombOptions(),
 ):
+    _logger.debug("🐝 Configuring OpenTelemetry using Honeycomb distro 🐝")
     resource = create_resource(options)
     set_tracer_provider(
         create_tracer_provider(options, resource)

honeycomb/opentelemetry/options.py

@@ -1,15 +1,28 @@
+import logging
 import os
 from opentelemetry.sdk.environment_variables import (
     OTEL_SERVICE_NAME,
     OTEL_EXPORTER_OTLP_ENDPOINT
 )
 from grpc import ssl_channel_credentials
 
-
 HONEYCOMB_API_KEY = "HONEYCOMB_API_KEY"
 HONEYCOMB_API_ENDPOINT = "HONEYCOMB_API_ENDPOINT"
+OTEL_LOG_LEVEL = "OTEL_LOG_LEVEL"
 DEFAULT_API_ENDPOINT = "api.honeycomb.io:443"
 DEFAULT_SERVICE_NAME = "unknown_service:python"
+DEFAULT_LOG_LEVEL = "ERROR"
+
+log_levels = {
+    "NOTSET": logging.NOTSET,
+    "DEBUG": logging.DEBUG,
+    "INFO": logging.INFO,
+    "WARNING": logging.WARNING,
+    "ERROR": logging.ERROR,
+    "CRITICAL": logging.CRITICAL,
+}
+
+_logger = logging.getLogger(__name__)
 
 
 class HoneycombOptions:
@@ -18,13 +31,21 @@ class HoneycombOptions:
     endpoint = DEFAULT_API_ENDPOINT
     insecure = False
     enable_metrics = False
+    log_level = DEFAULT_LOG_LEVEL
 
     def __init__(
-        self, apikey: str = None,
+        self,
+        apikey: str = None,
         service_name: str = None,
         endpoint: str = None,
-        insecure: bool = False
+        insecure: bool = False,
+        log_level: str = None
     ):
+        log_level = os.environ.get(OTEL_LOG_LEVEL, log_level)
+        if log_level and log_level.upper() in log_levels:
+            self.log_level = log_level.upper()
+        logging.basicConfig(level=log_levels[self.log_level])
+
         self.apikey = os.environ.get(HONEYCOMB_API_KEY, apikey)
 
         self.service_name = os.environ.get(OTEL_SERVICE_NAME, service_name)

tests/test_options.py

@@ -22,7 +22,6 @@ def test_defaults(monkeypatch):
 def test_can_set_service_name_with_param(monkeypatch):
     monkeypatch.delenv(OTEL_SERVICE_NAME, raising=False)
     options = HoneycombOptions(service_name='my-service')
-    print(vars(options))
     assert options.service_name == 'my-service'