Feature/query log control

Dockerfile

@@ -14,6 +14,7 @@ RUN chmod +x /start.sh
 # Template config
 ENV APP_ENTRYPOINT web
 ENV LOG_LEVEL info
+ENV LOG_SPARQL_ALL True
 ENV MU_SPARQL_ENDPOINT 'http://database:8890/sparql'
 ENV MU_SPARQL_UPDATEPOINT 'http://database:8890/sparql'
 ENV MU_APPLICATION_GRAPH 'http://mu.semte.ch/application'

README.md

@@ -300,6 +300,7 @@ my-python:
 ```
 
 ### Environment variables
+#### General
 
 - `LOG_LEVEL` takes the same options as defined in the Python [logging](https://docs.python.org/3/library/logging.html#logging-levels) module.
 
@@ -317,7 +318,16 @@ my-python:
 
 - `MU_SPARQL_TIMEOUT` is used to configure the timeout (in seconds) for SPARQL queries.
 
+#### SPARQL Query Logging
+- `LOG_SPARQL_ALL`: Log *all* executed queries, read as well as update (default `True`)
 
+- `LOG_SPARQL_QUERIES`: Log *read* queries (default: `undefined`). Overrules `LOG_SPARQL_ALL`
+
+- `LOG_SPARQL_UPDATES`: Log *update* queries (default `undefined`). Overrules `LOG_SPARQL_ALL`.
+
+The string "true", ignoring casing, is considered `True`.  All other values are considered `False`.
+
+#### Meinheld Gunicorn Docker Variables
 Since this template is based on the meinheld-gunicorn-docker image, all possible environment config for that image is also available for the template. See [meinheld-gunicorn-docker#environment-variables](https://github.com/tiangolo/meinheld-gunicorn-docker#environment-variables) for more info. The template configures `WEB_CONCURRENCY` in particular to `1` by default.
 
 ### Production

helpers.py

@@ -42,6 +42,16 @@
 consoleHandler = logging.StreamHandler(stream=sys.stdout)# or stderr?
 logger.addHandler(consoleHandler)
 
+LOG_SPARQL_ALL_VAR = os.environ.get('LOG_SPARQL_ALL')
+LOG_SPARQL_QUERIES = os.environ.get(
+    'LOG_SPARQL_QUERIES',
+    default=LOG_SPARQL_ALL_VAR
+).lower() == 'true'
+LOG_SPARQL_UPDATES = os.environ.get(
+    'LOG_SPARQL_UPDATES',
+    default=LOG_SPARQL_ALL_VAR
+).lower() == 'true'
+
 def generate_uuid():
     """Generates a random unique user id (UUID) based on the host ID and current time"""
     return str(uuid.uuid1())
@@ -119,14 +129,15 @@ def validate_resource_type(expected_type, data):
 
 def query(the_query):
     """Execute the given SPARQL query (select/ask/construct) on the triplestore and returns the results in the given return Format (JSON by default)."""
-    log("execute query: \n" + the_query)
     for header in MU_HEADERS:
         if header in request.headers:
             sparqlQuery.customHttpHeaders[header] = request.headers[header]
         else: # Make sure headers used for a previous query are cleared
             if header in sparqlQuery.customHttpHeaders:
                 del sparqlQuery.customHttpHeaders[header]
     sparqlQuery.setQuery(the_query)
+    if LOG_SPARQL_QUERIES:
+        log("Execute query: \n" + the_query)
     return sparqlQuery.query().convert()
 
 
@@ -140,6 +151,8 @@ def update(the_query):
                 del sparqlUpdate.customHttpHeaders[header]
     sparqlUpdate.setQuery(the_query)
     if sparqlUpdate.isSparqlUpdateRequest():
+        if LOG_SPARQL_UPDATES:
+            log("Execute query: \n" + the_query)
         sparqlUpdate.query()