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angie-conv-image/scripts/jinja.py

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#!/usr/bin/env python3
import importlib
import json
import os
import os.path
import sys
import jinja2
import yaml
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J2_MODULES_DEFAULT = 'os os.path sys netaddr psutil re wcmatch'
J2_SUFFIX_DEFAULT = '.j2'
J2_CFG_PATHS = [
'/angie/jinja',
'/etc/angie/jinja',
]
J2_CFG_EXTS = [
'yml',
'yaml',
'json',
]
J2_SEARCH_PATH = [
'.',
'/etc/angie',
]
J2_EXT_LIST = [
'jinja2.ext.do',
'jinja2.ext.loopcontrols',
]
J2_MODULES = sorted(set(os.getenv('NGX_JINJA_MODULES', J2_MODULES_DEFAULT).split(sep=' ')))
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ME = sys.argv[0]
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J2_SUFFIX = os.getenv('NGX_JINJA_SUFFIX', J2_SUFFIX_DEFAULT)
if J2_SUFFIX == '':
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raise ValueError('NGX_JINJA_SUFFIX is empty')
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if not J2_SUFFIX.startswith('.'):
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raise ValueError('NGX_JINJA_SUFFIX does not start with dot (".")')
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J2_CONFIG = os.getenv('NGX_JINJA_CONFIG', '')
if (J2_CONFIG != '') and (not os.path.exists(J2_CONFIG)):
print(f'{ME}: config does not exist, skipping: {J2_CONFIG}', file=sys.stderr)
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if len(sys.argv) < 2:
raise ValueError('not enough arguments (needed: 2)')
if len(sys.argv) > 3:
raise ValueError('too many arguments (needed: 2)')
if not sys.argv[1]:
raise ValueError('specify input file')
input_file = sys.argv[1]
if not os.path.exists(input_file):
raise ValueError('input file does not exist')
if len(sys.argv) == 3:
if not sys.argv[2]:
raise ValueError('specify output file')
output_file = sys.argv[2]
else:
output_file, ext = os.path.splitext(input_file)
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if ext != J2_SUFFIX:
raise ValueError(f'input file name extension mismatch (not a "{J2_SUFFIX}")')
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if input_file == output_file:
raise ValueError('unable to process template inplace')
kwargs = {}
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for m in J2_MODULES:
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kwargs[m] = importlib.import_module(m)
kwargs['env'] = os.environ
kwargs['cfg'] = {}
def merge_dict_from_file(filename):
if not filename:
return False
if not isinstance(filename, str):
return False
if filename == '':
return False
if not os.path.exists(filename):
return False
if not os.path.isfile(filename):
print(f'{ME}: not a file, skipping: {filename}', file=sys.stderr)
return False
if filename.endswith('.yml') or filename.endswith('.yaml'):
with open(filename, mode='r', encoding='utf-8') as fx:
x = yaml.safe_load(fx)
kwargs['cfg'] = kwargs['cfg'] | x
return True
if filename.endswith('.json'):
with open(filename, mode='r', encoding='utf-8') as fx:
x = json.load(fx)
kwargs['cfg'] = kwargs['cfg'] | x
return True
print(f'{ME}: non-recognized name extension: {filename}', file=sys.stderr)
return False
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if (J2_CONFIG != '') and (os.path.isfile(J2_CONFIG)):
merge_dict_from_file(J2_CONFIG)
else:
for base in J2_CFG_PATHS:
for full in [ base + '.' + ext for ext in J2_CFG_EXTS ]:
if merge_dict_from_file(full):
break
continue
j2_loader = jinja2.FileSystemLoader(J2_SEARCH_PATH, followlinks=True)
j2_environ = jinja2.Environment(loader=j2_loader, extensions=J2_EXT_LIST)
j2_template = j2_environ.get_template(input_file)
j2_stream = j2_template.stream(**kwargs)
j2_stream.disable_buffering()
j2_stream.dump(output_file, encoding='utf-8')