search.py
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import math
import threading
import time
import typesense
from typesense import exceptions as typesense_exceptions
TYPESENSE_API = open('./docs/typesense').read().strip()
TYPESENSE_API, TYPESENSE_HOST = TYPESENSE_API.split(':')
client = typesense.Client({
'api_key': TYPESENSE_API,
'nodes': [{
'host': TYPESENSE_HOST,
'port': '8108',
'protocol': 'http'
}],
'connection_timeout_seconds': 1.
})
COLLECTION = 'presup_actpro_fts'
schema = {
'name': COLLECTION,
'fields': [
{'name': 'devengado', 'type': 'float'},
{'name': 'is_class', 'type': 'bool'},
{'name': 'class_', 'type': 'string'},
{'name': 'texto', 'type': 'string'},
{'name': 'metadatos', 'type': 'string'},
],
'default_sorting_field': 'devengado',
}
search_parameters = {
"q": "cuba",
"query_by": "texto",
# "facet_by": "gestion",
"sort_by": "devengado:desc",
"per_page": 20,
}
AVAILABLE_CLASSES = [
'programa_proyecto',
'entidad',
'objeto',
'finfun',
'acteco',
'ubigeo',
'rubro',
'organismo',
]
BACKEND_ERRORS = (
typesense_exceptions.Timeout,
typesense_exceptions.ServiceUnavailable,
typesense_exceptions.ServerError,
typesense_exceptions.HTTPStatus0Error,
OSError,
)
FAILURE_THRESHOLD = 2
OPEN_INTERVAL_SECONDS = 15.0
class SearchUnavailable(Exception):
def __init__(self, retry_after: int):
self.retry_after = retry_after
super().__init__('search backend unavailable')
class SearchGuard:
def __init__(self):
self._lock = threading.Lock()
self._failures = 0
self._opened_until = 0.0
def enter(self):
now = time.monotonic()
with self._lock:
if self._opened_until > now:
raise SearchUnavailable(max(1, math.ceil(self._opened_until - now)))
def record_success(self):
with self._lock:
self._failures = 0
self._opened_until = 0.0
def record_failure(self):
now = time.monotonic()
with self._lock:
self._failures += 1
if self._failures >= FAILURE_THRESHOLD:
self._opened_until = now + OPEN_INTERVAL_SECONDS
return int(OPEN_INTERVAL_SECONDS)
return 1
search_guard = SearchGuard()
def do_search(query, page, is_class, class_=None, order=None):
search_guard.enter()
search_parameters_ = search_parameters.copy()
search_parameters_['q'] = query
if is_class is not None:
filter_c = ''
if is_class:
filter_c = 'is_class:true'
else:
filter_c = 'is_class:false'
search_parameters_['filter_by'] = filter_c
if (class_ is not None):
class_ = [_ for _ in class_.split(',') if _ in AVAILABLE_CLASSES]
if len(class_):
search_parameters_['filter_by'] = 'class_:[{}]'.format(', '.join(class_))
if (page is not None) and (page > 0) and (page < 100):
search_parameters_['page'] = page
if order == 'asc':
search_parameters_['sort_by'] = 'devengado:asc'
try:
response = client.collections[COLLECTION].documents.search(
search_parameters_
)
except BACKEND_ERRORS:
raise SearchUnavailable(search_guard.record_failure())
search_guard.record_success()
return response