[#100] Add new method for logs gathering

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>

src/frostfs_testlib/hosting/docker_host.py

@@ -212,6 +212,30 @@ class DockerHost(Host):
             with open(file_path, "wb") as file:
                 file.write(logs)
 
+    def get_filtered_logs(
+        self,
+        filter_regex: str,
+        since: Optional[datetime] = None,
+        until: Optional[datetime] = None,
+        unit: Optional[str] = None,
+    ) -> str:
+        client = self._get_docker_client()
+        filtered_logs = ""
+        for service_config in self._config.services:
+            container_name = self._get_service_attributes(service_config.name).container_name
+            try:
+                filtered_logs = client.logs(container_name, since=since, until=until)
+            except HTTPError as exc:
+                logger.info(f"Got exception while dumping logs of '{container_name}': {exc}")
+                continue
+
+            matches = re.findall(filter_regex, filtered_logs, re.IGNORECASE + re.MULTILINE)
+            found = list(matches)
+            if found:
+                filtered_logs += f"{container_name}:\n{os.linesep.join(found)}"
+
+        return filtered_logs
+
     def is_message_in_logs(
         self,
         message_regex: str,