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#!/usr/bin/python
from __future__ import unicode_literals
try:
import StringIO
except ImportError:
# Python 3
import io as StringIO
from . import core
def text_string_to_metric_families(text):
"""Parse Prometheus text format from a string.
See text_fd_to_metric_families.
"""
for metric_family in text_fd_to_metric_families(StringIO.StringIO(text)):
yield metric_family
def _unescape_help(text):
result = []
slash = False
for char in text:
if slash:
if char == '\\':
result.append('\\')
elif char == 'n':
result.append('\n')
else:
result.append('\\' + char)
slash = False
else:
if char == '\\':
slash = True
else:
result.append(char)
if slash:
result.append('\\')
return ''.join(result)
def _parse_sample(text):
name = []
labelname = []
labelvalue = []
value = []
labels = {}
state = 'name'
for char in text:
if state == 'name':
if char == '{':
state = 'startoflabelname'
elif char == ' ' or char == '\t':
state = 'endofname'
else:
name.append(char)
elif state == 'endofname':
if char == ' ' or char == '\t':
pass
elif char == '{':
state = 'startoflabelname'
else:
value.append(char)
state = 'value'
elif state == 'startoflabelname':
if char == ' ' or char == '\t':
pass
elif char == '}':
state = 'endoflabels'
else:
state = 'labelname'
labelname.append(char)
elif state == 'labelname':
if char == '=':
state = 'labelvaluequote'
elif char == ' ' or char == '\t':
state = 'labelvalueequals'
else:
labelname.append(char)
elif state == 'labelvalueequals':
if char == '=':
state = 'labelvaluequote'
elif char == ' ' or char == '\t':
pass
else:
raise ValueError("Invalid line: " + text)
elif state == 'labelvaluequote':
if char == '"':
state = 'labelvalue'
elif char == ' ' or char == '\t':
pass
else:
raise ValueError("Invalid line: " + text)
elif state == 'labelvalue':
if char == '\\':
state = 'labelvalueslash'
elif char == '"':
labels[''.join(labelname)] = ''.join(labelvalue)
labelname = []
labelvalue = []
state = 'nextlabel'
else:
labelvalue.append(char)
elif state == 'labelvalueslash':
state = 'labelvalue'
if char == '\\':
labelvalue.append('\\')
elif char == 'n':
labelvalue.append('\n')
elif char == '"':
labelvalue.append('"')
else:
labelvalue.append('\\' + char)
elif state == 'nextlabel':
if char == ',':
state = 'labelname'
elif char == '}':
state = 'endoflabels'
elif char == ' ' or char == '\t':
pass
else:
raise ValueError("Invalid line: " + text)
elif state == 'endoflabels':
if char == ' ' or char == '\t':
pass
else:
value.append(char)
state = 'value'
elif state == 'value':
if char == ' ' or char == '\t':
# Timestamps are not supported, halt
break
else:
value.append(char)
return (''.join(name), labels, float(''.join(value)))
def text_fd_to_metric_families(fd):
"""Parse Prometheus text format from a file descriptor.
This is a laxer parser than the main Go parser,
so successful parsing does not imply that the parsed
text meets the specification.
Yields core.Metric's.
"""
name = ''
documentation = ''
typ = 'untyped'
samples = []
allowed_names = []
def build_metric(name, documentation, typ, samples):
metric = core.Metric(name, documentation, typ)
metric.samples = samples
return metric
for line in fd:
line = line.strip()
if line.startswith('#'):
parts = line.split(None, 3)
if len(parts) < 2:
continue
if parts[1] == 'HELP':
if parts[2] != name:
if name != '':
yield build_metric(name, documentation, typ, samples)
# New metric
name = parts[2]
typ = 'untyped'
samples = []
allowed_names = [parts[2]]
if len(parts) == 4:
documentation = _unescape_help(parts[3])
else:
documentation = ''
elif parts[1] == 'TYPE':
if parts[2] != name:
if name != '':
yield build_metric(name, documentation, typ, samples)
# New metric
name = parts[2]
documentation = ''
samples = []
typ = parts[3]
allowed_names = {
'counter': [''],
'gauge': [''],
'summary': ['_count', '_sum', ''],
'histogram': ['_count', '_sum', '_bucket'],
}.get(typ, [parts[2]])
allowed_names = [name + n for n in allowed_names]
else:
# Ignore other comment tokens
pass
elif line == '':
# Ignore blank lines
pass
else:
sample = _parse_sample(line)
if sample[0] not in allowed_names:
if name != '':
yield build_metric(name, documentation, typ, samples)
# New metric, yield immediately as untyped singleton
name = ''
documentation = ''
typ = 'untyped'
samples = []
allowed_names = []
yield build_metric(sample[0], documentation, typ, [sample])
else:
samples.append(sample)
if name != '':
yield build_metric(name, documentation, typ, samples)
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