def pre_tree(func_db, module, config=None, cache=None):
"""
Scan the modules ahead of time and make a map of all the documents-its for
future use. Must be called before tree(). This database of functions will
then be called by tree() to query and walk the 'froms'
"""
config = common.always(config)
cache = common.always(cache)
if module.__name__ in cache:
# Been here before, nothing to do
return
cache[module.__name__] = {'processed': True}
for obj_type, obj in inspect.getmembers(module):
if inspect.ismodule(obj):
if obj.__package__.startswith(module.__package__):
pre_tree(func_db, obj, config, cache)
elif inspect.isfunction(obj):
comments = inspect.getcomments(obj)
if comments is not None and len(comments) > 0:
for raw_item in comments.strip().split("\n"):
item = raw_item.strip()
if item.startswith(DOCUMENT_IT):
key = module.__name__ + "." + obj_type
value = json.loads(item[len(DOCUMENT_IT):])
fix_local_from(module, value)
add_to_tree_database(func_db, key, value)
def clear_scroll(scroll_id, config: dict = None):
"""
This action is called to clear a scroll ID from CMR allowing CMR to free up
memory associated with the current search.
This call is the same as calling the following CURL command:
curl -i -XPOST -H "Content-Type: application/json" \
https://cmr.earthdata.nasa.gov/search/clear-scroll \
-d '{ "scroll_id" : "xxxx"}'
This API call must send " and not '
API call returns HTTP status code 204 when successful.
Parameters:
scroll_id(string/number): CMR Scroll ID
config(dictionary) - used to make configurations changes
Returns:
error dictionary if there was a problem, otherwise a JSON object of response headers
"""
config = common.always(config)
# Build headers
headers = _standard_headers_from_config(config)
headers = common.conj(headers, {'Content-Type': 'application/json'})
url = _cmr_basic_url('clear-scroll', None, config)
data = '{"scroll_id": "' + str(scroll_id) + '"}'
logger.info(" - %s: %s", 'POST', url)
obj_json = net.post(url, data, headers=headers)
if 'errors' in obj_json:
errors = obj_json['errors']
for err in errors:
logger.warning(" Error while clearing scroll: %s", err)
return obj_json
def _cmr_basic_url(base: str, query: dict, config: dict = None):
"""
Create a url for calling any CMR search end point, should not make any
assumption, beyond the search directory. Will auto set the envirnment based
on how config is set
Parameters:
base: CMR endpoint
query: dictionary url parameters
config: configurations, responds to:
* env - sit, uat, ops, prod, production, or blank for production
"""
expanded = ""
if query is not None and len(query) > 0:
expanded = "?" + net.expand_query_to_parameters(query)
config = common.always(config)
env = config.get('env', '').lower().strip()
if len(env) > 0 and not env.endswith("."):
env += "."
if env in ['', 'ops', 'prod', 'production']:
env = ""
url = ('https://cmr.{}earthdata.nasa.gov/search/{}{}').format(
env, base, expanded)
return url
def config_to_header(config,
source_key,
headers,
destination_key=None,
default=None):
"""
Copy a value in the config into a header dictionary for use by urllib. Written
to reduce boiler plate code
config[key] -> [or default] -> [rename] -> headers[key]
Parameters:
config(dictionary): where to look for values
source_key(string): name if configuration in config
headers(dictionary): where to copy values to
destination_key(string): name of key to save to in headers
default(string): value to use if value can not be found in config
"""
config = common.always(config)
if destination_key is None:
destination_key = source_key
value = config.get(source_key, default)
if destination_key is not None and value is not None:
if headers is None:
headers = {}
headers[destination_key] = value
return headers
def search_by_page(base, query = None, filters = None, page_state = None, config: dict = None):
"""
Recursive function to download all the pages of data. Note, this function
will only run for 5 minutes and then will refuse to pull more pages
returning what was found in that amount of time.
Parameters:
query (dictionary): CMR parameters and their values
filters (list): A list of lambda functions to reduce the number of columns
page_state (dictionary): the current page to download
config (dictionary): configurations settings responds to:
* accept - the format for the return defaults to UMM-JSON
* max-time - total processing time allowed for all calls
return collected items
"""
config = common.always(config)
if page_state is None:
page_state = create_page_state() # must be the first page
obj_json = _make_search_request(base, query, page_state, config)
if isinstance(obj_json, str):
return _error_object(0, "unknown response: " + obj_json)
if 'errors' in obj_json:
return obj_json
resp_stats = {'hits': obj_json['hits'], 'took': obj_json['took']}
items = obj_json['items']
if 'http-headers' in obj_json:
http_headers = obj_json['http-headers']
if 'CMR-Scroll-Id' in http_headers and page_state['limit']>2000:
page_state['CMR-Scroll-Id'] = http_headers['CMR-Scroll-Id']
items = apply_filters(filters, items)
if _continue_download(page_state):
accumulated_took_time = page_state['took'] + resp_stats['took']
max_allowed_time = config.get('max-time', 300000)
if accumulated_took_time > max_allowed_time:
# Do not allow searches to go on forever, put an end to this and
# return what has been found so far, but leave a log message
logger.warning("max search time exceeded")
return items[:page_state['limit']]
next_page_state = _next_page_state(page_state, resp_stats['took'])
recursive_items = search_by_page(base,
query=query,
filters=filters,
page_state=next_page_state,
config=config)
items = items + recursive_items
else:
if 'CMR-Scroll-Id' in page_state and page_state['limit']>2000:
scroll_ret = clear_scroll(page_state['CMR-Scroll-Id'], config)
if 'errors' in scroll_ret:
for err in scroll_ret['errors']:
logger.warning('Error processing scroll: %s', err)
logger.info("Total records downloaded was %d of %d which took %dms.",
len(items),
resp_stats['hits'],
resp_stats['took'])
return items[:page_state['limit']]
def token_config(config: dict = None):
"""
Pull a token from the configuration dictionary
Parameters:
config: Responds to:
"cmr.token.value": value of token, defaults to 'None'
"""
config = common.always(config)
value = config.get('cmr.token.value', None)
return value
def _token_file_path(config: dict = None):
"""
Return the path to the file which stores a CMR token. This path can be different
for each environment if specified with the env config.
Returns
~/.cmr_token<.env>, no env if production
"""
config = common.always(config)
env_extention = _env_to_extention(config)
path_to_use = config.get('cmr.token.file', '~/.cmr_token' + env_extention)
return path_to_use
def token_file(config: dict = None):
"""
Load a token from a local user file assumed to be ~/.cmr_token
Parameters:
config: Responds to:
"cmr.token.file": location of token file, defaults to ~/.cmr_token
Returns
token from file
"""
config = common.always(config)
path_to_use = config.get('cmr.token.file', '~/.cmr_token')
path = os.path.expanduser(path_to_use)
clear_text = None
raw_clear_text = common.read_file(path)
if raw_clear_text is not None:
for line in raw_clear_text.splitlines():
if not line.startswith("#"):
clear_text = line
break # we only need the first one
return clear_text
def token_manager(config: dict = None):
"""
Use a system like the MacOS X Keychain app. Any os which also has the
security app would also work.
Parameters:
config: Responds to the following:
'token.manager.account': account field in Keychain
'token.manager.app': Keychain command - defaults to /usr/bin/security
'token.manager.service' defaults to 'cmr-lib-token'
Returns:
token from Keychain
"""
try:
config = common.always(config)
account = config.get('token.manager.account', 'user')
service = config.get('token.manager.service', 'cmr-lib-token')
app = config.get('token.manager.app', '/usr/bin/security')
result = common.call_security(account, service, app)
except subprocess.CalledProcessError:
result = None
return result
def _env_to_extention(config: dict = None):
"""
Allow different files to be loaded for each environment, make an env
extension which will be appended to the token file path
Parameters:
config dictionary containing an env value
Return:
empty string or a dot followed by the environment.
"""
config = common.always(config)
env = config.get('env', '')
if env is None:
env = ''
env = env.lower().strip()
if len(env) > 0 and env.endswith("."):
env = env[:-1]
if env in ['', 'ops', 'prod', 'production']:
env = "" # no extension
else:
env = "." + env
return env
def _env_to_edl_url(endpoint, config: dict = None):
"""
Pull out parameters from the config and build an EDL endpoint URL
Parameters:
endpoint: part of the URL after 'api/users' such as token, tokens, revoke_token
config: responds to 'env'
Return: URL
"""
config = common.always(config)
env = config.get('env', '')
if env is None:
env = ''
env = env.lower().strip()
if env in ['', 'ops', 'prod', 'production']:
env = "" # no extension
url = 'https://{}.urs.earthdata.nasa.gov/api/users/{}'.format(
env, endpoint)
url = url.replace("://.urs", "://urs")
return url
def test_always(self):
"""Test the always function"""
self.assertEqual({}, com.always("wrong type"), 'wrong thing')
self.assertEqual({}, com.always([]), 'wrong type')
self.assertEqual({}, com.always({}), 'same type')
self.assertEqual({'a': 'b'}, com.always({'a': 'b'}),
'populated dict, assumed')
self.assertEqual({'a': 'b'}, com.always({'a': 'b'}, otype=dict),
'populated dict')
self.assertEqual(['a', 'b'], com.always(['a', 'b'], otype=list),
'populated list')
self.assertEqual((1, 2, 3), com.always((1, 2, 3), otype=tuple),
'populated tuple')
self.assertEqual((1, 2, 3), com.always((1, 2, 3), tuple),
'populated tuple, positional')
# None use cases
self.assertEqual({}, com.always(None), 'assumed, none, dict')
self.assertEqual({}, com.always(None, otype=dict), 'None, dict')
self.assertEqual([], com.always(None, otype=list), 'None, list')
self.assertEqual((), com.always(None, otype=tuple), 'None, tuple')
self.assertEqual((), com.always(None, tuple),
'None, tuple, positional')
