Handle driver initialization errors to avoid service crash

This patch fixes the issue when failed osprofiler driver brings
the whole service down. With this patch the default no-op behaviour
is used in case of initialization failure.

Change-Id: I6ebc393576f4fc3f8b4134164bafc2e09f102ebd

4 files changed, 11 insertions, 11 deletions

diff --git a/osprofiler/drivers/elasticsearch_driver.py b/osprofiler/drivers/elasticsearch_driver.py
index 85bab74..c24eb60 100644
--- a/osprofiler/drivers/elasticsearch_driver.py
+++ b/osprofiler/drivers/elasticsearch_driver.py
@@ -36,9 +36,9 @@ class ElasticsearchDriver(base.Driver):
             from elasticsearch import Elasticsearch
         except ImportError:
             raise exc.CommandError(
-                "To use this command, you should install "
-                "'elasticsearch' manually. Use command:\n "
-                "'pip install elasticsearch'.")
+                "To use OSProfiler with ElasticSearch driver, "
+                "please install `elasticsearch` library. "
+                "To install with pip:\n `pip install elasticsearch`.")
 
         client_url = parser.urlunparse(parser.urlparse(self.connection_str)
                                        ._replace(scheme="http"))
diff --git a/osprofiler/drivers/jaeger.py b/osprofiler/drivers/jaeger.py
index 669aa13..82b7a23 100644
--- a/osprofiler/drivers/jaeger.py
+++ b/osprofiler/drivers/jaeger.py
@@ -40,8 +40,8 @@ class Jaeger(base.Driver):
         except ImportError:
             raise exc.CommandError(
                 "To use OSProfiler with Uber Jaeger tracer, "
-                "you have to install `jaeger-client` manually. "
-                "Install with pip:\n `pip install jaeger-client`."
+                "please install `jaeger-client` library. "
+                "To install with pip:\n `pip install jaeger-client`."
             )
 
         parsed_url = parser.urlparse(connection_str)
diff --git a/osprofiler/drivers/mongodb.py b/osprofiler/drivers/mongodb.py
index 0ca1928..a0372f6 100644
--- a/osprofiler/drivers/mongodb.py
+++ b/osprofiler/drivers/mongodb.py
@@ -28,9 +28,9 @@ class MongoDB(base.Driver):
             from pymongo import MongoClient
         except ImportError:
             raise exc.CommandError(
-                "To use this command, you should install "
-                "'pymongo' manually. Use command:\n "
-                "'pip install pymongo'.")
+                "To use OSProfiler with MongoDB driver, "
+                "please install `pymongo` library. "
+                "To install with pip:\n `pip install pymongo`.")
 
         client = MongoClient(self.connection_str, connect=False)
         self.db = client[db_name]
diff --git a/osprofiler/drivers/redis_driver.py b/osprofiler/drivers/redis_driver.py
index 250a81c..0952702 100644
--- a/osprofiler/drivers/redis_driver.py
+++ b/osprofiler/drivers/redis_driver.py
@@ -40,9 +40,9 @@ class Redis(base.Driver):
             from redis import StrictRedis
         except ImportError:
             raise exc.CommandError(
-                "To use this command, you should install "
-                "'redis' manually. Use command:\n "
-                "'pip install redis'.")
+                "To use OSProfiler with Redis driver, "
+                "please install `redis` library. "
+                "To install with pip:\n `pip install redis`.")
 
         # only connection over network is supported with schema
         # redis://[:password]@host[:port][/db]