mirror of https://github.com/morpheus65535/bazarr
691 lines
22 KiB
Python
691 lines
22 KiB
Python
"""CPStats, a package for collecting and reporting on program statistics.
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Overview
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========
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Statistics about program operation are an invaluable monitoring and debugging
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tool. Unfortunately, the gathering and reporting of these critical values is
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usually ad-hoc. This package aims to add a centralized place for gathering
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statistical performance data, a structure for recording that data which
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provides for extrapolation of that data into more useful information,
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and a method of serving that data to both human investigators and
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monitoring software. Let's examine each of those in more detail.
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Data Gathering
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--------------
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Just as Python's `logging` module provides a common importable for gathering
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and sending messages, performance statistics would benefit from a similar
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common mechanism, and one that does *not* require each package which wishes
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to collect stats to import a third-party module. Therefore, we choose to
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re-use the `logging` module by adding a `statistics` object to it.
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That `logging.statistics` object is a nested dict. It is not a custom class,
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because that would:
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1. require libraries and applications to import a third-party module in
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order to participate
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2. inhibit innovation in extrapolation approaches and in reporting tools, and
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3. be slow.
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There are, however, some specifications regarding the structure of the dict.::
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{
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+----"SQLAlchemy": {
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| "Inserts": 4389745,
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| "Inserts per Second":
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| lambda s: s["Inserts"] / (time() - s["Start"]),
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| C +---"Table Statistics": {
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| o | "widgets": {-----------+
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N | l | "Rows": 1.3M, | Record
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a | l | "Inserts": 400, |
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m | e | },---------------------+
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e | c | "froobles": {
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s | t | "Rows": 7845,
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p | i | "Inserts": 0,
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a | o | },
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c | n +---},
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e | "Slow Queries":
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| [{"Query": "SELECT * FROM widgets;",
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| "Processing Time": 47.840923343,
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| },
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| ],
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+----},
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}
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The `logging.statistics` dict has four levels. The topmost level is nothing
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more than a set of names to introduce modularity, usually along the lines of
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package names. If the SQLAlchemy project wanted to participate, for example,
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it might populate the item `logging.statistics['SQLAlchemy']`, whose value
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would be a second-layer dict we call a "namespace". Namespaces help multiple
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packages to avoid collisions over key names, and make reports easier to read,
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to boot. The maintainers of SQLAlchemy should feel free to use more than one
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namespace if needed (such as 'SQLAlchemy ORM'). Note that there are no case
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or other syntax constraints on the namespace names; they should be chosen
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to be maximally readable by humans (neither too short nor too long).
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Each namespace, then, is a dict of named statistical values, such as
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'Requests/sec' or 'Uptime'. You should choose names which will look
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good on a report: spaces and capitalization are just fine.
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In addition to scalars, values in a namespace MAY be a (third-layer)
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dict, or a list, called a "collection". For example, the CherryPy
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:class:`StatsTool` keeps track of what each request is doing (or has most
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recently done) in a 'Requests' collection, where each key is a thread ID; each
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value in the subdict MUST be a fourth dict (whew!) of statistical data about
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each thread. We call each subdict in the collection a "record". Similarly,
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the :class:`StatsTool` also keeps a list of slow queries, where each record
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contains data about each slow query, in order.
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Values in a namespace or record may also be functions, which brings us to:
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Extrapolation
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-------------
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The collection of statistical data needs to be fast, as close to unnoticeable
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as possible to the host program. That requires us to minimize I/O, for example,
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but in Python it also means we need to minimize function calls. So when you
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are designing your namespace and record values, try to insert the most basic
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scalar values you already have on hand.
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When it comes time to report on the gathered data, however, we usually have
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much more freedom in what we can calculate. Therefore, whenever reporting
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tools (like the provided :class:`StatsPage` CherryPy class) fetch the contents
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of `logging.statistics` for reporting, they first call
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`extrapolate_statistics` (passing the whole `statistics` dict as the only
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argument). This makes a deep copy of the statistics dict so that the
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reporting tool can both iterate over it and even change it without harming
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the original. But it also expands any functions in the dict by calling them.
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For example, you might have a 'Current Time' entry in the namespace with the
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value "lambda scope: time.time()". The "scope" parameter is the current
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namespace dict (or record, if we're currently expanding one of those
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instead), allowing you access to existing static entries. If you're truly
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evil, you can even modify more than one entry at a time.
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However, don't try to calculate an entry and then use its value in further
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extrapolations; the order in which the functions are called is not guaranteed.
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This can lead to a certain amount of duplicated work (or a redesign of your
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schema), but that's better than complicating the spec.
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After the whole thing has been extrapolated, it's time for:
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Reporting
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---------
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The :class:`StatsPage` class grabs the `logging.statistics` dict, extrapolates
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it all, and then transforms it to HTML for easy viewing. Each namespace gets
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its own header and attribute table, plus an extra table for each collection.
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This is NOT part of the statistics specification; other tools can format how
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they like.
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You can control which columns are output and how they are formatted by updating
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StatsPage.formatting, which is a dict that mirrors the keys and nesting of
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`logging.statistics`. The difference is that, instead of data values, it has
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formatting values. Use None for a given key to indicate to the StatsPage that a
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given column should not be output. Use a string with formatting
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(such as '%.3f') to interpolate the value(s), or use a callable (such as
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lambda v: v.isoformat()) for more advanced formatting. Any entry which is not
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mentioned in the formatting dict is output unchanged.
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Monitoring
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----------
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Although the HTML output takes pains to assign unique id's to each <td> with
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statistical data, you're probably better off fetching /cpstats/data, which
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outputs the whole (extrapolated) `logging.statistics` dict in JSON format.
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That is probably easier to parse, and doesn't have any formatting controls,
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so you get the "original" data in a consistently-serialized format.
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Note: there's no treatment yet for datetime objects. Try time.time() instead
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for now if you can. Nagios will probably thank you.
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Turning Collection Off
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----------------------
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It is recommended each namespace have an "Enabled" item which, if False,
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stops collection (but not reporting) of statistical data. Applications
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SHOULD provide controls to pause and resume collection by setting these
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entries to False or True, if present.
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Usage
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=====
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To collect statistics on CherryPy applications::
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from cherrypy.lib import cpstats
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appconfig['/']['tools.cpstats.on'] = True
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To collect statistics on your own code::
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import logging
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# Initialize the repository
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if not hasattr(logging, 'statistics'): logging.statistics = {}
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# Initialize my namespace
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mystats = logging.statistics.setdefault('My Stuff', {})
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# Initialize my namespace's scalars and collections
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mystats.update({
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'Enabled': True,
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'Start Time': time.time(),
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'Important Events': 0,
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'Events/Second': lambda s: (
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(s['Important Events'] / (time.time() - s['Start Time']))),
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})
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...
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for event in events:
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...
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# Collect stats
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if mystats.get('Enabled', False):
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mystats['Important Events'] += 1
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To report statistics::
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root.cpstats = cpstats.StatsPage()
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To format statistics reports::
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See 'Reporting', above.
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"""
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import logging
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import os
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import sys
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import threading
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import time
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import cherrypy
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from cherrypy._cpcompat import json
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# ------------------------------- Statistics -------------------------------- #
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if not hasattr(logging, 'statistics'):
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logging.statistics = {}
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def extrapolate_statistics(scope):
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"""Return an extrapolated copy of the given scope."""
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c = {}
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for k, v in list(scope.items()):
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if isinstance(v, dict):
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v = extrapolate_statistics(v)
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elif isinstance(v, (list, tuple)):
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v = [extrapolate_statistics(record) for record in v]
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elif hasattr(v, '__call__'):
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v = v(scope)
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c[k] = v
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return c
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# -------------------- CherryPy Applications Statistics --------------------- #
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appstats = logging.statistics.setdefault('CherryPy Applications', {})
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appstats.update({
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'Enabled': True,
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'Bytes Read/Request': lambda s: (
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s['Total Requests'] and
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(s['Total Bytes Read'] / float(s['Total Requests'])) or
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0.0
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),
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'Bytes Read/Second': lambda s: s['Total Bytes Read'] / s['Uptime'](s),
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'Bytes Written/Request': lambda s: (
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s['Total Requests'] and
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(s['Total Bytes Written'] / float(s['Total Requests'])) or
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0.0
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),
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'Bytes Written/Second': lambda s: (
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s['Total Bytes Written'] / s['Uptime'](s)
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),
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'Current Time': lambda s: time.time(),
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'Current Requests': 0,
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'Requests/Second': lambda s: float(s['Total Requests']) / s['Uptime'](s),
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'Server Version': cherrypy.__version__,
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'Start Time': time.time(),
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'Total Bytes Read': 0,
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'Total Bytes Written': 0,
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'Total Requests': 0,
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'Total Time': 0,
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'Uptime': lambda s: time.time() - s['Start Time'],
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'Requests': {},
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})
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proc_time = lambda s: time.time() - s['Start Time']
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class ByteCountWrapper(object):
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"""Wraps a file-like object, counting the number of bytes read."""
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def __init__(self, rfile):
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self.rfile = rfile
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self.bytes_read = 0
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def read(self, size=-1):
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data = self.rfile.read(size)
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self.bytes_read += len(data)
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return data
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def readline(self, size=-1):
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data = self.rfile.readline(size)
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self.bytes_read += len(data)
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return data
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def readlines(self, sizehint=0):
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# Shamelessly stolen from StringIO
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total = 0
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lines = []
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line = self.readline()
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while line:
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lines.append(line)
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total += len(line)
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if 0 < sizehint <= total:
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break
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line = self.readline()
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return lines
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def close(self):
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self.rfile.close()
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def __iter__(self):
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return self
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def next(self):
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data = self.rfile.next()
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self.bytes_read += len(data)
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return data
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average_uriset_time = lambda s: s['Count'] and (s['Sum'] / s['Count']) or 0
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def _get_threading_ident():
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if sys.version_info >= (3, 3):
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return threading.get_ident()
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return threading._get_ident()
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class StatsTool(cherrypy.Tool):
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"""Record various information about the current request."""
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def __init__(self):
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cherrypy.Tool.__init__(self, 'on_end_request', self.record_stop)
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def _setup(self):
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"""Hook this tool into cherrypy.request.
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The standard CherryPy request object will automatically call this
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method when the tool is "turned on" in config.
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"""
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if appstats.get('Enabled', False):
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cherrypy.Tool._setup(self)
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self.record_start()
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def record_start(self):
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"""Record the beginning of a request."""
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request = cherrypy.serving.request
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if not hasattr(request.rfile, 'bytes_read'):
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request.rfile = ByteCountWrapper(request.rfile)
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request.body.fp = request.rfile
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r = request.remote
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appstats['Current Requests'] += 1
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appstats['Total Requests'] += 1
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appstats['Requests'][_get_threading_ident()] = {
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'Bytes Read': None,
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'Bytes Written': None,
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# Use a lambda so the ip gets updated by tools.proxy later
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'Client': lambda s: '%s:%s' % (r.ip, r.port),
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'End Time': None,
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'Processing Time': proc_time,
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'Request-Line': request.request_line,
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'Response Status': None,
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'Start Time': time.time(),
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}
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def record_stop(
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self, uriset=None, slow_queries=1.0, slow_queries_count=100,
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debug=False, **kwargs):
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"""Record the end of a request."""
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resp = cherrypy.serving.response
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w = appstats['Requests'][_get_threading_ident()]
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r = cherrypy.request.rfile.bytes_read
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w['Bytes Read'] = r
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appstats['Total Bytes Read'] += r
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if resp.stream:
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w['Bytes Written'] = 'chunked'
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else:
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cl = int(resp.headers.get('Content-Length', 0))
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w['Bytes Written'] = cl
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appstats['Total Bytes Written'] += cl
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w['Response Status'] = getattr(
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resp, 'output_status', None) or resp.status
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w['End Time'] = time.time()
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p = w['End Time'] - w['Start Time']
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w['Processing Time'] = p
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appstats['Total Time'] += p
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appstats['Current Requests'] -= 1
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if debug:
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cherrypy.log('Stats recorded: %s' % repr(w), 'TOOLS.CPSTATS')
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if uriset:
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rs = appstats.setdefault('URI Set Tracking', {})
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r = rs.setdefault(uriset, {
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'Min': None, 'Max': None, 'Count': 0, 'Sum': 0,
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'Avg': average_uriset_time})
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if r['Min'] is None or p < r['Min']:
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r['Min'] = p
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if r['Max'] is None or p > r['Max']:
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r['Max'] = p
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r['Count'] += 1
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r['Sum'] += p
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if slow_queries and p > slow_queries:
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sq = appstats.setdefault('Slow Queries', [])
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sq.append(w.copy())
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if len(sq) > slow_queries_count:
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sq.pop(0)
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cherrypy.tools.cpstats = StatsTool()
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# ---------------------- CherryPy Statistics Reporting ---------------------- #
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thisdir = os.path.abspath(os.path.dirname(__file__))
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missing = object()
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locale_date = lambda v: time.strftime('%c', time.gmtime(v))
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iso_format = lambda v: time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(v))
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def pause_resume(ns):
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def _pause_resume(enabled):
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pause_disabled = ''
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resume_disabled = ''
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if enabled:
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resume_disabled = 'disabled="disabled" '
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else:
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pause_disabled = 'disabled="disabled" '
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return """
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<form action="pause" method="POST" style="display:inline">
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<input type="hidden" name="namespace" value="%s" />
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<input type="submit" value="Pause" %s/>
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</form>
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<form action="resume" method="POST" style="display:inline">
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<input type="hidden" name="namespace" value="%s" />
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<input type="submit" value="Resume" %s/>
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</form>
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""" % (ns, pause_disabled, ns, resume_disabled)
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return _pause_resume
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class StatsPage(object):
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formatting = {
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'CherryPy Applications': {
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'Enabled': pause_resume('CherryPy Applications'),
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'Bytes Read/Request': '%.3f',
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'Bytes Read/Second': '%.3f',
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'Bytes Written/Request': '%.3f',
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'Bytes Written/Second': '%.3f',
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'Current Time': iso_format,
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'Requests/Second': '%.3f',
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'Start Time': iso_format,
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'Total Time': '%.3f',
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'Uptime': '%.3f',
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'Slow Queries': {
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'End Time': None,
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'Processing Time': '%.3f',
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'Start Time': iso_format,
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},
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'URI Set Tracking': {
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'Avg': '%.3f',
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'Max': '%.3f',
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'Min': '%.3f',
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'Sum': '%.3f',
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},
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'Requests': {
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'Bytes Read': '%s',
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'Bytes Written': '%s',
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'End Time': None,
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'Processing Time': '%.3f',
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'Start Time': None,
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},
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},
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'CherryPy WSGIServer': {
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'Enabled': pause_resume('CherryPy WSGIServer'),
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'Connections/second': '%.3f',
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'Start time': iso_format,
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},
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}
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@cherrypy.expose
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def index(self):
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# Transform the raw data into pretty output for HTML
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yield """
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<html>
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<head>
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<title>Statistics</title>
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<style>
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th, td {
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padding: 0.25em 0.5em;
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border: 1px solid #666699;
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}
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table {
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border-collapse: collapse;
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}
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table.stats1 {
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width: 100%;
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}
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table.stats1 th {
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font-weight: bold;
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text-align: right;
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background-color: #CCD5DD;
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}
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table.stats2, h2 {
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margin-left: 50px;
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}
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table.stats2 th {
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font-weight: bold;
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text-align: center;
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background-color: #CCD5DD;
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}
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</style>
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</head>
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<body>
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"""
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for title, scalars, collections in self.get_namespaces():
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yield """
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<h1>%s</h1>
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<table class='stats1'>
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<tbody>
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""" % title
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for i, (key, value) in enumerate(scalars):
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colnum = i % 3
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if colnum == 0:
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yield """
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<tr>"""
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yield (
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"""
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<th>%(key)s</th><td id='%(title)s-%(key)s'>%(value)s</td>""" %
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vars()
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)
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if colnum == 2:
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yield """
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</tr>"""
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if colnum == 0:
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yield """
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<th></th><td></td>
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<th></th><td></td>
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</tr>"""
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|
elif colnum == 1:
|
|
yield """
|
|
<th></th><td></td>
|
|
</tr>"""
|
|
yield """
|
|
</tbody>
|
|
</table>"""
|
|
|
|
for subtitle, headers, subrows in collections:
|
|
yield """
|
|
<h2>%s</h2>
|
|
<table class='stats2'>
|
|
<thead>
|
|
<tr>""" % subtitle
|
|
for key in headers:
|
|
yield """
|
|
<th>%s</th>""" % key
|
|
yield """
|
|
</tr>
|
|
</thead>
|
|
<tbody>"""
|
|
for subrow in subrows:
|
|
yield """
|
|
<tr>"""
|
|
for value in subrow:
|
|
yield """
|
|
<td>%s</td>""" % value
|
|
yield """
|
|
</tr>"""
|
|
yield """
|
|
</tbody>
|
|
</table>"""
|
|
yield """
|
|
</body>
|
|
</html>
|
|
"""
|
|
|
|
def get_namespaces(self):
|
|
"""Yield (title, scalars, collections) for each namespace."""
|
|
s = extrapolate_statistics(logging.statistics)
|
|
for title, ns in sorted(s.items()):
|
|
scalars = []
|
|
collections = []
|
|
ns_fmt = self.formatting.get(title, {})
|
|
for k, v in sorted(ns.items()):
|
|
fmt = ns_fmt.get(k, {})
|
|
if isinstance(v, dict):
|
|
headers, subrows = self.get_dict_collection(v, fmt)
|
|
collections.append((k, ['ID'] + headers, subrows))
|
|
elif isinstance(v, (list, tuple)):
|
|
headers, subrows = self.get_list_collection(v, fmt)
|
|
collections.append((k, headers, subrows))
|
|
else:
|
|
format = ns_fmt.get(k, missing)
|
|
if format is None:
|
|
# Don't output this column.
|
|
continue
|
|
if hasattr(format, '__call__'):
|
|
v = format(v)
|
|
elif format is not missing:
|
|
v = format % v
|
|
scalars.append((k, v))
|
|
yield title, scalars, collections
|
|
|
|
def get_dict_collection(self, v, formatting):
|
|
"""Return ([headers], [rows]) for the given collection."""
|
|
# E.g., the 'Requests' dict.
|
|
headers = []
|
|
try:
|
|
# python2
|
|
vals = v.itervalues()
|
|
except AttributeError:
|
|
# python3
|
|
vals = v.values()
|
|
for record in vals:
|
|
for k3 in record:
|
|
format = formatting.get(k3, missing)
|
|
if format is None:
|
|
# Don't output this column.
|
|
continue
|
|
if k3 not in headers:
|
|
headers.append(k3)
|
|
headers.sort()
|
|
|
|
subrows = []
|
|
for k2, record in sorted(v.items()):
|
|
subrow = [k2]
|
|
for k3 in headers:
|
|
v3 = record.get(k3, '')
|
|
format = formatting.get(k3, missing)
|
|
if format is None:
|
|
# Don't output this column.
|
|
continue
|
|
if hasattr(format, '__call__'):
|
|
v3 = format(v3)
|
|
elif format is not missing:
|
|
v3 = format % v3
|
|
subrow.append(v3)
|
|
subrows.append(subrow)
|
|
|
|
return headers, subrows
|
|
|
|
def get_list_collection(self, v, formatting):
|
|
"""Return ([headers], [subrows]) for the given collection."""
|
|
# E.g., the 'Slow Queries' list.
|
|
headers = []
|
|
for record in v:
|
|
for k3 in record:
|
|
format = formatting.get(k3, missing)
|
|
if format is None:
|
|
# Don't output this column.
|
|
continue
|
|
if k3 not in headers:
|
|
headers.append(k3)
|
|
headers.sort()
|
|
|
|
subrows = []
|
|
for record in v:
|
|
subrow = []
|
|
for k3 in headers:
|
|
v3 = record.get(k3, '')
|
|
format = formatting.get(k3, missing)
|
|
if format is None:
|
|
# Don't output this column.
|
|
continue
|
|
if hasattr(format, '__call__'):
|
|
v3 = format(v3)
|
|
elif format is not missing:
|
|
v3 = format % v3
|
|
subrow.append(v3)
|
|
subrows.append(subrow)
|
|
|
|
return headers, subrows
|
|
|
|
if json is not None:
|
|
@cherrypy.expose
|
|
def data(self):
|
|
s = extrapolate_statistics(logging.statistics)
|
|
cherrypy.response.headers['Content-Type'] = 'application/json'
|
|
return json.dumps(s, sort_keys=True, indent=4)
|
|
|
|
@cherrypy.expose
|
|
def pause(self, namespace):
|
|
logging.statistics.get(namespace, {})['Enabled'] = False
|
|
raise cherrypy.HTTPRedirect('./')
|
|
pause.cp_config = {'tools.allow.on': True,
|
|
'tools.allow.methods': ['POST']}
|
|
|
|
@cherrypy.expose
|
|
def resume(self, namespace):
|
|
logging.statistics.get(namespace, {})['Enabled'] = True
|
|
raise cherrypy.HTTPRedirect('./')
|
|
resume.cp_config = {'tools.allow.on': True,
|
|
'tools.allow.methods': ['POST']}
|