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|
#!/usr/bin/env python3
import re
class WriteRequest(object):
@staticmethod
def parse(lines):
"""
Parse multiple Write objects separeted by new-line character.
>>> lines = []
>>> lines += ['cpu']
>>> lines += ['cpu,host=serverA,region=us-west']
>>> lines += ['cpu,host=serverA,region=us-west field1=1,field2=2']
>>> lines += ['cpu,host=serverA,region=us-west field1=1,field2=2 1234']
>>> print("\\n".join(map(str, WriteRequest.parse("\\n".join(lines)))))
cpu
cpu,host="serverA",region="us-west"
cpu,host="serverA",region="us-west" field1=1,field2=2
cpu,host="serverA",region="us-west" field1=1,field2=2 1234
"""
writes = map(Write.parse, lines.split("\n"))
return list(writes)
@staticmethod
def parseFile(file):
for line in file.readlines():
yield Write.parse(line)
class Write(object):
def __init__(self, key, tags, fields, timestamp=None):
self.key = key
self.tags = tags
self.fields = fields
self.timestamp = timestamp
if isinstance(self.tags, dict):
self.tags = self.tags.items()
if isinstance(self.fields, dict):
self.fields = self.fields.items()
@staticmethod
def parse(line):
"""
Parse a line from the POST request into a Write object.
>>> Write.parse('cpu')
<Write key=cpu tags=None fields=None timestamp=None>
>>> print(Write.parse('cpu'))
cpu
>>> Write.parse('cpu,host=serverA,region=us-west')
<Write key=cpu tags=[('host', 'serverA'), ('region', 'us-west')] fields=None timestamp=None>
>>> print(Write.parse('cpu,host=serverA,region=us-west'))
cpu,host="serverA",region="us-west"
>>> Write.parse('cpu\\,01,host=serverA,region=us-west')
<Write key=cpu,01 tags=[('host', 'serverA'), ('region', 'us-west')] fields=None timestamp=None>
>>> print(Write.parse('cpu\,01,host=serverA,region=us-west'))
cpu\,01,host="serverA",region="us-west"
>>> Write.parse('cpu,host=server\\ A,region=us\\ west')
<Write key=cpu tags=[('host', 'server A'), ('region', 'us west')] fields=None timestamp=None>
>>> print(Write.parse('cpu,host=server\\ A,region=us\\ west'))
cpu,host="server A",region="us west"
>>> Write.parse('cpu,ho\=st=server\ A,region=us\ west')
<Write key=cpu tags=[('ho=st', 'server A'), ('region', 'us west')] fields=None timestamp=None>
>>> print(Write.parse('cpu,ho\=st=server\ A,region=us\ west'))
cpu,ho\=st="server A",region="us west"
>>> print(Write.parse('cpu,ho\=st=server\ A field=123'))
cpu,ho\=st="server A" field=123
>>> print(Write.parse('cpu,foo=bar,foo=bar field=123,field=123')) # error: double name is accepted
cpu,foo="bar",foo="bar" field=123,field=123
>>> print(Write.parse('cpu field12=12'))
cpu field12=12
>>> print(Write.parse('cpu field12=12 123123123'))
cpu field12=12 123123123
>>> print(Write.parse('cpu field12=12 1231abcdef123'))
Traceback (most recent call last):
...
ValueError: invalid literal for int() with base 10: '1231abcdef123'
"""
def unescape(string):
return re.sub(r'(?<!\\)([\\,=])', '', string)
def unescape_value(string):
if string.startswith("\"") and string.endswith("\""):
string = re.sub(r'(?<!\\)(["])', '', string)
else:
string = unescape(string)
if re.match("^[0-9]+$", string):
return int(string)
elif re.match("^[0-9]*\.[0-9]*$", string):
return float(string)
elif string.lower() in ["t", "true", "f", "false"]:
return string.lower in ["t", "true"]
else:
return string
args = re.split(r"(?<!\\) ", line)
key, *tags = re.split(r"(?<!\\),", args[0])
key = unescape(key)
if tags:
tags = map(lambda tag: re.split(r"(?<!\\)=", tag), tags)
tags = map(lambda tag: (unescape(tag[0]), unescape_value(tag[1])), tags)
tags = list(tags)
else:
tags = None
if len(args) > 1:
fields = re.split(r"(?<!\\),", args[1])
fields = map(lambda field: re.split(r"(?<!\\)=", field), fields)
fields = map(lambda field: (unescape(field[0]), unescape_value(field[1])), fields)
fields = list(fields)
else:
fields = None
if len(args) > 2:
timestamp = int(args[2])
else:
timestamp = None
return Write(key, tags, fields, timestamp)
def __repr__(self):
return "<{} key={} tags={} fields={} timestamp={}>".format(
self.__class__.__name__, self.key, self.tags, self.fields, self.timestamp)
def __str__(self):
def escape_key(string):
return re.sub(r'([\\,= ])', '\\\\\\1', string)
def escape_value(obj):
if isinstance(obj, float) or isinstance(obj, int) or isinstance(obj, bool):
return str(obj)
else:
obj = str(obj)
return "\"" + obj.replace("\"","\\\"") + "\""
def escape_kv(kvlist):
return ",".join(
map(lambda kv: escape_key(kv[0]) + "=" + escape_value(kv[1]),
kvlist))
result = escape_key(self.key)
if self.tags:
result += ","
result += escape_kv(self.tags)
if self.fields:
result += " "
result += escape_kv(self.fields)
if self.timestamp:
result += " "
result += str(self.timestamp)
return result
if __name__ == "__main__":
import doctest
doctest.testmod()
|
