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# Copyright (c) Microsoft Corporation.
# Licensed under the MIT license.
import os
import sys
import json
import logging
import logging.handlers
import time
import threading
import re
from datetime import datetime
from enum import Enum, unique
from logging import StreamHandler
from queue import Queue
from .rest_utils import rest_post
from .url_utils import gen_send_stdout_url
from .commands import CommandType
@unique
class LogType(Enum):
Trace = 'TRACE'
Debug = 'DEBUG'
Info = 'INFO'
Warning = 'WARNING'
Error = 'ERROR'
Fatal = 'FATAL'
@unique
class StdOutputType(Enum):
Stdout = 'stdout',
Stderr = 'stderr'
def nni_log(log_type, log_message):
'''Log message into stdout'''
dt = datetime.now()
print('[{0}] {1} {2}'.format(dt, log_type.value, log_message), flush=True)
class NNIRestLogHanlder(StreamHandler):
def __init__(self, host, port, tag, trial_id, channel, std_output_type=StdOutputType.Stdout):
StreamHandler.__init__(self)
self.host = host
self.port = port
self.tag = tag
self.std_output_type = std_output_type
self.trial_id = trial_id
self.channel = channel
self.orig_stdout = sys.__stdout__
self.orig_stderr = sys.__stderr__
def emit(self, record):
log_entry = {}
log_entry['tag'] = self.tag
log_entry['stdOutputType'] = self.std_output_type.name
log_entry['msg'] = self.format(record)
try:
if self.channel is None:
rest_post(gen_send_stdout_url(self.host, self.port), json.dumps(log_entry), 10, True)
else:
if self.trial_id is not None:
log_entry["trial"] = self.trial_id
self.channel.send(CommandType.StdOut, log_entry)
except Exception as e:
self.orig_stderr.write(str(e) + '\n')
self.orig_stderr.flush()
class RemoteLogger(object):
"""
NNI remote logger
"""
def __init__(self, syslog_host, syslog_port, tag, std_output_type, log_collection, trial_id=None, channel=None, log_level=logging.INFO):
'''
constructor
'''
logger_name = 'nni_syslog_{}'.format(tag)
# to prevent multiple trial logged in same logger
if trial_id is not None:
logger_name = '{}_{}'.format(logger_name, trial_id)
self.logger = logging.getLogger(logger_name)
self.log_level = log_level
self.logger.setLevel(self.log_level)
self.pipeReader = None
self.handler = NNIRestLogHanlder(syslog_host, syslog_port, tag, trial_id, channel)
self.logger.addHandler(self.handler)
if std_output_type == StdOutputType.Stdout:
self.orig_stdout = sys.__stdout__
else:
self.orig_stdout = sys.__stderr__
self.log_collection = log_collection
def get_pipelog_reader(self):
'''
Get pipe for remote logger
'''
self.pipeReader = PipeLogReader(self.logger, self.log_collection, logging.INFO)
return self.pipeReader
def flush(self):
'''
Add flush in handler
'''
for handler in self.logger.handlers:
handler.flush()
def write(self, buf):
'''
Write buffer data into logger/stdout
'''
for line in buf.rstrip().splitlines():
self.orig_stdout.write(line.rstrip() + '\n')
self.orig_stdout.flush()
try:
self.logger.log(self.log_level, line.rstrip())
except Exception:
pass
def close(self):
'''
Close handlers and resources
'''
if self.pipeReader is not None:
self.pipeReader.set_process_exit()
for handler in self.logger.handlers:
handler.close()
self.logger.removeHandler(handler)
class PipeLogReader(threading.Thread):
"""
The reader thread reads log data from pipe
"""
def __init__(self, logger, log_collection, log_level=logging.INFO):
"""Setup the object with a logger and a loglevel
and start the thread
"""
threading.Thread.__init__(self)
self.queue = Queue()
self.logger = logger
self.daemon = False
self.log_level = log_level
self.fdRead, self.fdWrite = os.pipe()
self.pipeReader = os.fdopen(self.fdRead)
self.orig_stdout = sys.__stdout__
self._is_read_completed = False
self.process_exit = False
self.log_collection = log_collection
self.log_pattern = re.compile(r'NNISDK_MEb\'.*\'$')
def _populateQueue(stream, queue):
'''
Collect lines from 'stream' and put them in 'quque'.
'''
time.sleep(1)
while True:
cur_process_exit = self.process_exit
try:
line = self.queue.get(True, 5)
try:
self.logger.log(self.log_level, line.rstrip())
except Exception:
pass
except Exception:
if cur_process_exit == True:
self._is_read_completed = True
break
self.pip_log_reader_thread = threading.Thread(target=_populateQueue, args=(self.pipeReader, self.queue))
self.pip_log_reader_thread.daemon = True
self.start()
self.pip_log_reader_thread.start()
def fileno(self):
"""Return the write file descriptor of the pipe
"""
return self.fdWrite
def run(self):
"""Run the thread, logging everything.
If the log_collection is 'none', the log content will not be enqueued
"""
for line in iter(self.pipeReader.readline, ''):
self.orig_stdout.write(line.rstrip() + '\n')
self.orig_stdout.flush()
if self.log_collection == 'none':
search_result = self.log_pattern.search(line)
if search_result:
metrics = search_result.group(0)
self.queue.put(metrics+'\n')
else:
self.queue.put(line)
self.pipeReader.close()
def close(self):
"""Close the write end of the pipe.
"""
os.close(self.fdWrite)
@property
def is_read_completed(self):
"""Return if read is completed
"""
return self._is_read_completed
def set_process_exit(self):
self.process_exit = True
return self.process_exit
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