Expose log files through global state API. (#641)

* added log_table function and a test

* fixed log_files and added task_profiles

* fixed formatting

* fixed linting errors

* fixes

* removed file

* more fixes

* hopefully fixed

* Small changes.

* Fix linting.

* Fix bug in log monitor.

* Small changes.

* Fix bug in travis.

python/ray/experimental/state.py

@@ -304,3 +304,31 @@ class GlobalState(object):
       node_info[node_ip_address].append(client_info_parsed)
 
     return node_info
+
+  def log_files(self):
+    """Fetch and return a dictionary of log file names to outputs.
+
+    Returns:
+      IP address to log file name to log file contents mappings.
+    """
+    relevant_files = self.redis_client.keys("LOGFILE*")
+
+    ip_filename_file = dict()
+
+    for filename in relevant_files:
+      filename = filename.decode("ascii")
+      filename_components = filename.split(":")
+      ip_addr = filename_components[1]
+
+      file = self.redis_client.lrange(filename, 0, -1)
+      file_str = []
+      for x in file:
+        y = x.decode("ascii")
+        file_str.append(y)
+
+      if ip_addr not in ip_filename_file:
+        ip_filename_file[ip_addr] = dict()
+
+      ip_filename_file[ip_addr][filename] = file_str
+
+    return ip_filename_file