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#!/usr/bin/env python
#
# Copyright (c) 2018 Orange
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""
Provides utilities to display oom (sub)modules resources stats
"""
import os
import sys
import getopt
from fnmatch import fnmatch as match
import yaml
try:
from tabulate import tabulate
except ImportError as e:
message = "Warning: cannot import tabulate module (): {}\n".format(str(e))
sys.stderr.write(message)
def tabulate(lines, headers, tablefmt=None):
fmt = ""
nbco = len(headers)
lenco = map(len, headers)
for line in lines:
for i in range(nbco):
lenco[i] = max(lenco[i], len(str(line[i])))
fmt = map(lambda n: "{{:<{}}}".format(n), map(lambda i: i+2, lenco))
fmt = " ".join(fmt)
sep = map(lambda x: '-'*(x+2), lenco)
output = [fmt.format(*headers), fmt.format(*sep)]
for line in lines:
output.append(fmt.format(*line))
return "\n".join(output)
def values(root='.'):
''' Get the list of values.yaml files '''
a = []
for dirname, dirnames, filenames in os.walk(root):
for filename in filenames:
if filename == 'values.yaml':
a.append((dirname, filename))
if '.git' in dirnames:
# don't go into any .git directories.
dirnames.remove('.git')
return a
def keys(dic, prefix=None):
''' recursively traverse the specified dict to collect existing keys '''
result = []
if dic:
for k, v in dic.items():
if prefix:
k = '.'.join((prefix, k))
if isinstance(v, dict):
result += keys(v, k)
else:
result.append(k)
return result
class Project:
'''
class to access to oom (sub)module (aka project) resources
'''
def __init__(self, dirname, filename):
self.dirname = os.path.normpath(dirname)
self.name = self.explicit()
self.filename = os.path.join(dirname, filename)
self.resources = None
self.load()
def load(self):
''' load resources from yaml description '''
with open(self.filename, 'r') as istream:
try:
v = yaml.load(istream)
if v:
self.resources = v.get('resources', None)
except Exception as e:
print(e)
raise
def explicit(self):
''' return an explicit name for the project '''
path = []
head, name = os.path.split(self.dirname)
if not name:
return head
while head:
head, tail = os.path.split(head)
if tail:
path.append(tail)
else:
path.append(head)
head = None
path.reverse()
index = path.index('charts') if 'charts' in path else None
if index:
name = os.path.join(path[index-1], name)
return name
def __contains__(self, key):
params = self.resources
if key:
for k in key.split('.'):
if params and k in params:
params = params[k]
else:
return False
return True
def __getitem__(self, key):
params = self.resources
for k in key.split('.'):
if k in params:
params = params[k]
if params != self.resources:
return params
def get(self, key, default="-"):
""" mimic dict method """
if key in self:
return self[key]
return default
def keys(self):
""" mimic dict method """
return keys(self.resources)
#
#
#
def usage(status=None):
""" usage doc """
arg0 = os.path.basename(os.path.abspath(sys.argv[0]))
print("""Usage: {} [options] <root-directory>""".format(arg0))
print((
"\n"
"Options:\n"
"-h, --help Show this help message and exit\n"
"-t, --table <format> Use the specified format to display the result table.\n"
" Valid formats are those from the python `tabulate'\n"
" module. When not available, a basic builtin tabular\n"
" function is used and this field has no effect\n"
"-f, --fields Comma separated list of resources fields to display.\n"
" You may use wildcard patterns, eg small.*. Implicit\n"
" value is *, ie all available fields will be used\n"
"Examples:\n"
" # oomstat /opt/oom/kubernetes\n"
" # oomstat -f small.\\* /opt/oom/kubernetes\n"
" # oomstat -f '*requests.*' -t fancy_grid /opt/oom/kubernetes\n"
" # oomstat -f small.requests.cpu,small.requests.memory /opt/oom/kubernetes\n"
))
if status is not None:
sys.exit(status)
def getopts():
""" read options from cmdline """
opts, args = getopt.getopt(sys.argv[1:],
"hf:t:",
["help", "fields=", "table="])
if len(args) != 1:
usage(1)
root = args[0]
table = None
fields = ['*']
patterns = []
for opt, arg in opts:
if opt in ("-h", '--help'):
usage(0)
elif opt in ("-f", "--fields"):
fields = arg.split(',')
elif opt in ("-t", "--table"):
table = arg
return root, table, fields, patterns
def main():
""" main """
try:
root, table, fields, patterns = getopts()
except getopt.GetoptError as e:
print("Error: {}".format(e))
usage(1)
# find projects
projects = []
for dirname, filename in values(root):
projects.append(Project(dirname, filename))
# check if we want to use pattern matching (wildcard only)
if fields and reduce(lambda x, y: x or y,
map(lambda string: '*' in string, fields)):
patterns = fields
fields = []
# if fields are not specified or patterns are used, discover available fields
# and use them (sort for readability)
if patterns or not fields:
avail = sorted(set(reduce(lambda x, y: x+y,
map(lambda p: p.keys(), projects))))
if patterns:
for pattern in patterns:
fields += filter(lambda string: match(string, pattern), avail)
else:
fields = avail
# collect values for each project
results = map(lambda project: [project.name] + map(project.get,
fields),
projects)
# and then print
if results:
headers = ['project'] + fields
print(tabulate(sorted(results), headers, tablefmt=table))
main()
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