Log profiling information from worker. (#178)

* Log timing events on workers.

* Have workers log to the event log through the local scheduler.

* Fixes and address comments.

* bug fix

* styling

src/common/Makefile

@@ -4,7 +4,7 @@ BUILD = build
 
 all: hiredis redis redismodule $(BUILD)/libcommon.a
 
-$(BUILD)/libcommon.a: event_loop.o common.o task.o io.o net.o state/redis.o state/table.o state/object_table.o state/task_table.o state/db_client_table.o state/local_scheduler_table.o thirdparty/ae/ae.o thirdparty/sha256.o
+$(BUILD)/libcommon.a: event_loop.o common.o task.o io.o net.o logging.o state/redis.o state/table.o state/object_table.o state/task_table.o state/db_client_table.o state/local_scheduler_table.o thirdparty/ae/ae.o thirdparty/sha256.o
 	ar rcs $@ $^
 
 $(BUILD)/common_tests: test/common_tests.c $(BUILD)/libcommon.a

src/common/lib/python/common_extension.c

@@ -74,6 +74,14 @@ static PyObject *PyObjectID_id(PyObject *self) {
                                    sizeof(s->object_id.id));
 }
 
+static PyObject *PyObjectID_hex(PyObject *self) {
+  PyObjectID *s = (PyObjectID *) self;
+  char hex_id[ID_STRING_SIZE];
+  object_id_to_string(s->object_id, hex_id, ID_STRING_SIZE);
+  PyObject *result = PyUnicode_FromString(hex_id);
+  return result;
+}
+
 static PyObject *PyObjectID_richcompare(PyObjectID *self,
                                         PyObject *other,
                                         int op) {
@@ -140,6 +148,8 @@ static PyObject *PyObjectID___reduce__(PyObjectID *self) {
 static PyMethodDef PyObjectID_methods[] = {
     {"id", (PyCFunction) PyObjectID_id, METH_NOARGS,
      "Return the hash associated with this ObjectID"},
+    {"hex", (PyCFunction) PyObjectID_hex, METH_NOARGS,
+     "Return the object ID as a string in hex."},
     {"__reduce__", (PyCFunction) PyObjectID___reduce__, METH_NOARGS,
      "Say how to pickle this ObjectID. This raises an exception to prevent"
      "object IDs from being serialized."},

src/common/logging.c

@@ -82,3 +82,15 @@ void ray_log(ray_logger *logger,
   utstring_free(formatted_message);
   utstring_free(timestamp);
 }
+
+void ray_log_event(db_handle *db,
+                   uint8_t *key,
+                   int64_t key_length,
+                   uint8_t *value,
+                   int64_t value_length) {
+  int status = redisAsyncCommand(db->context, NULL, NULL, "RPUSH %b %b", key,
+                                 key_length, value, value_length);
+  if ((status == REDIS_ERR) || db->context->err) {
+    LOG_REDIS_DEBUG(db->context, "error while logging message to event log");
+  }
+}

src/common/logging.h

@@ -13,6 +13,8 @@
 #define RAY_OBJECT "OBJECT"
 #define RAY_TASK "TASK"
 
+#include "state/db.h"
+
 typedef struct ray_logger_impl ray_logger;
 
 /* Initialize a Ray logger for the given client type and logging level. If the
@@ -36,4 +38,20 @@ void ray_log(ray_logger *logger,
              const char *event_type,
              const char *message);
 
-#endif
+/**
+ * Log an event to the event log.
+ *
+ * @param db The database handle.
+ * @param key The key in Redis to store the event in.
+ * @param key_length The length of the key.
+ * @param value The value to log.
+ * @param value_length The length of the value.
+ * @return Void.
+ */
+void ray_log_event(db_handle *db,
+                   uint8_t *key,
+                   int64_t key_length,
+                   uint8_t *value,
+                   int64_t value_length);
+
+#endif /* LOGGING_H */