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api.py
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api.py
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__author__ = "Jeremy Nelson"
import digests
import falcon
import hashlib
import json
import os
import rdflib
import requests
try:
from config import config
except ImportError:
config = {"debug": True,
"cache": "Cache",
"redis": {"host": "localhost",
"port": 6379,
"ttl": 604800},
"rest_api": {"host": "localhost",
"port": 18150},
# Blazegraph SPARQL Endpoint
"triplestore": {"host": "localhost",
"port": 8080,
"path": "bigdata"},
}
if config['cache'].startswith("TwemproxyCache"):
from cache.twemproxy import TwemproxyCache
CACHE = TwemproxyCache(**config)
elif config['cache'].startswith("ClusterCache"):
from cache.cluster import ClusterCache
CACHE = ClusterCache(**config)
else:
from cache import Cache
CACHE = Cache(**config)
print("CACHE is {}".format(CACHE))
rest = falcon.API()
# Hooks
def triple_key(req, resp, params):
if len(params) < 1:
params = req.params
subj = params.get('s', None)
pred = params.get('p', None)
obj = params.get('o', None)
triple_str, resp.body = None, None
print("In triple key {} {} {}".format(subj, pred, obj))
if subj and pred and obj:
triple_str = CACHE.datastore.evalsha(
CACHE.add_get_triple,
3,
subj,
pred,
obj)
if triple_str and CACHE.datastore.exists(triple_str):
triple_key = triple_str.decode()
triple_digests = triple_key.split(":")
resp.body = json.dumps(
{"key": triple_str.decode(),
"subject_sha1": triple_digests[0],
"predicate_sha1": triple_digests[1],
"object_sha1": triple_digests[2]}
)
elif triple_str:
resp.body = json.dumps(
{"missing-triple-key": triple_str.decode()}
)
else:
raise falcon.HTTPNotFound()
output = {"metadata": {"p": "void:triples",
"o": 0 },
"data": []}
# Subject search
if subj and (pred is None or obj is None):
print("Before subject key")
subject_key = "{}:pred-obj".format(hashlib.sha1(str(subj).encode()).hexdigest())
if not pred and not obj:
# Retrieve the entire set
results = CACHE.datastore.smembers(subject_key)
else:
if not pred:
pattern = "*:{}".format(hashlib.sha1(str(obj).encode()).hexdigest())
else:
pattern = "{}:*".format(hashlib.sha1(str(pred).encode()).hexdigest())
cursor, results = CACHE.datastore.sscan(subject_key, 0, match=pattern)
while cursor:
cursor, shard_results = CACHE.datastore.sscan(
subject_key,
cursor,
match=pattern)
results.extend(shard_results)
if len(results) >= 100:
ouput["metadata"]["cursor"] = cursor
break
output["metadata"]["o"] = len(results)
for triple_key in results:
triples = triple_key.decode().split(":")
output["data"].append({"p": CACHE.datastore.get(triples[0]).decode(),
"o": CACHE.datastore.get(triples[-1]).decode(),
"s": subj})
if pred and (subj is None or obj is None) and len(output["data"]) < 1:
predicate_key = "{}:subj-obj".format(
hashlib.sha1(str(pred).encode()).hexdigest())
if not obj and not subj:
results = CACHE.datastore.smembers(predicate_key)
else:
if not obj:
pattern = "{}:*".format(
hashlib.sha1(str(subj).encode()).hexdigest())
else:
pattern = "*:{}".format(
hashlib.sha1(str(obj).encode()).hexdigest())
cursor, results = CACHE.datastore.sscan(
predicate_key,
0,
match=pattern)
while cursor:
cursor, shard_results = CACHE.datastore.sscan(
predicate_key,
cursor,
match=pattern)
results.extend(shard_results)
if len(results) >= 100:
output["metadata"]["cursor"] = cursor
break
for triple_key in results:
triples = triple_key.decode().split(":")
output["data"].append({"p": pred,
"o": CACHE.datastore.get(triples[-1]).decode(),
"s": CACHE.datastore.get(triples[0]).decode()})
if obj and (subj is None or pred is None) and len(output["data"]) < 1:
obj_key = "{}:subj-pred".format(
hashlib.sha1(str(obj).encode()).hexdigest())
if not subj and not pred:
results = CACHE.datastore.smembers(obj_key)
else:
if not subj:
pattern = "*:{}".format(
hashlib.sha1(str(pred).encode()).hexdigest())
else:
pattern = "{}:*".format(
hashlib.sha1(str(obj).encode()).hexdigest())
cursor, results = CACHE.datastore.sscan(
obj_key,
0,
match=pattern)
while cursor:
cursor, shard_results = CACHE.datastore.sscan(
obj_key,
cursor,
match=pattern)
results.extend(shard_results)
if len(results) >= 100:
output["metadata"]["cursor"] = cursor
break
for triple_key in results:
triples = triple_key.decode().split(":")
output["data"].append({"p": CACHE.datastore.get(triples[-1]).decode(),
"o": obj,
"s": CACHE.datastore.get(triples[0]).decode()})
resp.body = json.dumps(output)
def get_triples(pattern):
cursor = -1
output = []
iterations = 0
while 1:
iterations += 1
if cursor == 0:
break
elif cursor < 0:
cursor = 0
cursor, resources = CACHE.datastore.scan(
cursor=cursor,
match=pattern,
count=1000)
cursor = int(cursor)
if len(resources) > 0:
output.extend(resources)
return output
def get_types(type_uri):
"""Function takes a type uri and returns all triple keys that
matches that RDF type for that uri.
Args:
type_uri -- URI to search for
Returns:
A list of all triples that match the RDF type of the
type_uri
"""
pattern = "*:{}:{}".format(digests.RDF.get(str(rdflib.RDF.type)),
digests.get_sha1_digest(type_uri))
return get_triples(pattern)
def get_graph(pattern):
graph = rdflib.Graph()
transaction = CACHE.datastore.pipeline(transaction=True)
for key in get_triples(pattern):
transaction.get(key)
json_triples = transaction.execute()
def get_subject_graph(subject):
"""Function takes a subject URI and scans through cache for all
triples matching the subject
Args:
subject -- subject URI
Returns:
rdflib.Graph made up all triples
"""
pattern = "{}:*:*".format(digests.get_sha1_digest(subject))
transaction = CACHE.datastore.pipeline
for key in get_triples(pattern):
pass
class Triple:
def __init__(self, **kwargs):
self.triplestore_url = kwargs.get("triplestore_url", None)
if not self.triplestore_url:
self.triplestore_url = "{}:{}/{}".format(
config.get('triplestore').get('host'),
config.get('triplestore').get('port'),
config.get('triplestore').get('path'))
@falcon.before(triple_key)
def on_get(self, req, resp):
if not resp.body:
# Should search SPARQL endpoint and add to cache
# if found
result = requests.post(self.triplestore_url,
data={"query": TRIPLE_SPARQL.format(req.args.get('s'),
req.args.get('p'),
req.args.get('o')),
"format": "json"})
if result.status_code < 399:
bindings = result.get('results').get('bindings')
if len(bindings) > 0:
for binding in bindings:
print(binding)
else:
raise falcon.HTTPNotFound()
resp.status = falcon.HTTP_200
# raise falcon.HTTPInternalServerError(
# "Failed to retrieve triple key",
# "Subject={} Predicate={} Object={}".format(req.args.get('s'),
# req.args.get('p'),
# req.args.get('o')))
@falcon.before(triple_key)
def on_post(self, req, resp):
if resp.body:
if 'missing-triple-key' in resp.body:
print(resp.body)
else:
raise falcon.HTTPInternalServerError("Error with server", "Could not set triple")
resp.status = falcon.HTTP_201
triple = Triple()
rest.add_route("/", triple)
if __name__ == '__main__':
if config.get('debug'):
from werkzeug.serving import run_simple
run_simple(
config.get('rest_api').get('host'),
config.get('rest_api').get('port'),
rest,
use_reloader=True)
else:
print("Production mode not support")