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telemetry.py
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telemetry.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2018-2019 Snowflake Computing Inc. All right reserved.
#
import logging
from threading import Lock
logger = logging.getLogger(__name__)
class TelemetryField(object):
"""
Fields which can be logged to telemetry
"""
TIME_CONSUME_FIRST_RESULT = "client_time_consume_first_result"
TIME_CONSUME_LAST_RESULT = "client_time_consume_last_result"
TIME_DOWNLOADING_CHUNKS = "client_time_downloading_chunks"
TIME_PARSING_CHUNKS = "client_time_parsing_chunks"
class TelemetryData(object):
"""
An instance of telemetry data which can be sent to the server
"""
def __init__(self, message, timestamp):
self.message = message
self.timestamp = timestamp
def to_dict(self):
return {
'message': self.message,
'timestamp': str(self.timestamp)
}
def __repr__(self):
return str(self.to_dict())
class TelemetryClient(object):
"""
Client to enqueue and send metrics to the telemetry endpoint in batch
"""
SF_PATH_TELEMETRY = "/telemetry/send"
DEFAULT_FORCE_FLUSH_SIZE = 100
def __init__(self, rest, flush_size=None):
self._rest = rest
self._log_batch = []
self._is_closed = False
self._flush_size = \
flush_size or TelemetryClient.DEFAULT_FORCE_FLUSH_SIZE
self._lock = Lock()
self._enabled = True
def add_log_to_batch(self, telemetry_data):
if self._is_closed:
raise Exception(
"Attempted to add log when TelemetryClient is closed")
elif not self._enabled:
logger.debug("TelemetryClient disabled. Ignoring log.")
return
with self._lock:
self._log_batch.append(telemetry_data)
if len(self._log_batch) >= self._flush_size:
self.send_batch()
def try_add_log_to_batch(self, telemetry_data):
try:
self.add_log_to_batch(telemetry_data)
except Exception:
logger.warning("Failed to add log to telemetry.", exc_info=True)
def send_batch(self):
if self._is_closed:
raise Exception(
"Attempted to send batch when TelemetryClient is closed")
elif not self._enabled:
logger.debug("TelemetryClient disabled. Not sending logs.")
return
with self._lock:
to_send = self._log_batch
self._log_batch = []
if not to_send:
logger.debug("Nothing to send to telemetry.")
return
body = {'logs': [x.to_dict() for x in to_send]}
logger.debug("Sending %d logs to telemetry.", len(body))
try:
ret = self._rest.request(TelemetryClient.SF_PATH_TELEMETRY, body=body,
method='post', client=None, timeout=5)
if not ret[u'success']:
logger.info(
"Non-success response from telemetry server: %s. "
"Disabling telemetry.", str(ret))
self._enabled = False
else:
logger.debug("Successfully uploading metrics to telemetry.")
except Exception:
self._enabled = False
logger.debug("Failed to upload metrics to telemetry.", exc_info=True)
def is_closed(self):
return self._is_closed
def close(self, send_on_close=True):
if not self._is_closed:
logger.debug("Closing telemetry client.")
if send_on_close:
self.send_batch()
self._is_closed = True
def disable(self):
self._enabled = False
def is_enabled(self):
return self._enabled
def buffer_size(self):
return len(self._log_batch)