author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
307
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""" |
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basic logging functionality based on a producer/consumer scheme. |
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XXX implement this API: (maybe put it into slogger.py?) |
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log = Logger( |
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info=py.log.STDOUT, |
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debug=py.log.STDOUT, |
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command=None) |
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log.info("hello", "world") |
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log.command("hello", "world") |
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log = Logger(info=Logger(something=...), |
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debug=py.log.STDOUT, |
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command=None) |
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""" |
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import py, sys |
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class Message(object): |
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def __init__(self, keywords, args): |
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self.keywords = keywords |
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self.args = args |
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|
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def content(self): |
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return " ".join(map(str, self.args)) |
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def prefix(self): |
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return "[%s] " % (":".join(self.keywords)) |
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def __str__(self): |
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return self.prefix() + self.content() |
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class Producer(object): |
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""" (deprecated) Log producer API which sends messages to be logged |
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to a 'consumer' object, which then prints them to stdout, |
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stderr, files, etc. Used extensively by PyPy-1.1. |
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""" |
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Message = Message # to allow later customization |
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keywords2consumer = {} |
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def __init__(self, keywords, keywordmapper=None, **kw): |
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if hasattr(keywords, 'split'): |
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keywords = tuple(keywords.split()) |
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self._keywords = keywords |
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if keywordmapper is None: |
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keywordmapper = default_keywordmapper |
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self._keywordmapper = keywordmapper |
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def __repr__(self): |
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return "<py.log.Producer %s>" % ":".join(self._keywords) |
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def __getattr__(self, name): |
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if '_' in name: |
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raise AttributeError(name) |
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producer = self.__class__(self._keywords + (name,)) |
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setattr(self, name, producer) |
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return producer |
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def __call__(self, *args): |
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""" write a message to the appropriate consumer(s) """ |
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func = self._keywordmapper.getconsumer(self._keywords) |
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if func is not None: |
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func(self.Message(self._keywords, args)) |
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class KeywordMapper: |
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def __init__(self): |
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self.keywords2consumer = {} |
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def getstate(self): |
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return self.keywords2consumer.copy() |
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def setstate(self, state): |
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self.keywords2consumer.clear() |
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self.keywords2consumer.update(state) |
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def getconsumer(self, keywords): |
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""" return a consumer matching the given keywords. |
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tries to find the most suitable consumer by walking, starting from |
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the back, the list of keywords, the first consumer matching a |
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keyword is returned (falling back to py.log.default) |
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""" |
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for i in range(len(keywords), 0, -1): |
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try: |
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return self.keywords2consumer[keywords[:i]] |
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except KeyError: |
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continue |
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return self.keywords2consumer.get('default', default_consumer) |
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|
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def setconsumer(self, keywords, consumer): |
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""" set a consumer for a set of keywords. """ |
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# normalize to tuples |
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if isinstance(keywords, str): |
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keywords = tuple(filter(None, keywords.split())) |
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elif hasattr(keywords, '_keywords'): |
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keywords = keywords._keywords |
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elif not isinstance(keywords, tuple): |
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raise TypeError("key %r is not a string or tuple" % (keywords,)) |
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if consumer is not None and not py.builtin.callable(consumer): |
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if not hasattr(consumer, 'write'): |
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raise TypeError( |
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"%r should be None, callable or file-like" % (consumer,)) |
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consumer = File(consumer) |
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self.keywords2consumer[keywords] = consumer |
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|
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def default_consumer(msg): |
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""" the default consumer, prints the message to stdout (using 'print') """ |
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sys.stderr.write(str(msg)+"\n") |
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|
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default_keywordmapper = KeywordMapper() |
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|
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def setconsumer(keywords, consumer): |
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default_keywordmapper.setconsumer(keywords, consumer) |
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|
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def setstate(state): |
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default_keywordmapper.setstate(state) |
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def getstate(): |
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return default_keywordmapper.getstate() |
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120 |
|
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121 |
# |
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122 |
# Consumers |
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123 |
# |
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124 |
|
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class File(object): |
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126 |
""" log consumer wrapping a file(-like) object """ |
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127 |
def __init__(self, f): |
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128 |
assert hasattr(f, 'write') |
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#assert isinstance(f, file) or not hasattr(f, 'open') |
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self._file = f |
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131 |
|
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132 |
def __call__(self, msg): |
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133 |
""" write a message to the log """ |
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134 |
self._file.write(str(msg) + "\n") |
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135 |
if hasattr(self._file, 'flush'): |
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136 |
self._file.flush() |
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137 |
|
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138 |
class Path(object): |
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139 |
""" log consumer that opens and writes to a Path """ |
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140 |
def __init__(self, filename, append=False, |
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141 |
delayed_create=False, buffering=False): |
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142 |
self._append = append |
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143 |
self._filename = str(filename) |
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144 |
self._buffering = buffering |
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145 |
if not delayed_create: |
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146 |
self._openfile() |
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147 |
|
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148 |
def _openfile(self): |
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149 |
mode = self._append and 'a' or 'w' |
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150 |
f = open(self._filename, mode) |
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151 |
self._file = f |
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152 |
|
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153 |
def __call__(self, msg): |
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154 |
""" write a message to the log """ |
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155 |
if not hasattr(self, "_file"): |
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156 |
self._openfile() |
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157 |
self._file.write(str(msg) + "\n") |
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158 |
if not self._buffering: |
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159 |
self._file.flush() |
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160 |
|
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161 |
def STDOUT(msg): |
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162 |
""" consumer that writes to sys.stdout """ |
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163 |
sys.stdout.write(str(msg)+"\n") |
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164 |
|
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165 |
def STDERR(msg): |
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166 |
""" consumer that writes to sys.stderr """ |
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167 |
sys.stderr.write(str(msg)+"\n") |
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168 |
|
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169 |
class Syslog: |
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170 |
""" consumer that writes to the syslog daemon """ |
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171 |
|
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172 |
def __init__(self, priority = None): |
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173 |
if priority is None: |
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174 |
priority = self.LOG_INFO |
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175 |
self.priority = priority |
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176 |
|
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177 |
def __call__(self, msg): |
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178 |
""" write a message to the log """ |
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179 |
py.std.syslog.syslog(self.priority, str(msg)) |
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180 |
|
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181 |
for _prio in "EMERG ALERT CRIT ERR WARNING NOTICE INFO DEBUG".split(): |
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182 |
_prio = "LOG_" + _prio |
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183 |
try: |
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184 |
setattr(Syslog, _prio, getattr(py.std.syslog, _prio)) |
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185 |
except AttributeError: |
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186 |
pass |