""" Data Transport - 1.0 Steve L. Nyemba, The Phi Technology LLC This file is a wrapper around mongodb for reading/writing content against a mongodb server and executing views (mapreduce) """ from pymongo import MongoClient from bson.objectid import ObjectId from bson.binary import Binary # import nujson as json from datetime import datetime import pandas as pd import numpy as np import gridfs # from transport import Reader,Writer import sys if sys.version_info[0] > 2 : from transport.common import Reader, Writer else: from common import Reader, Writer import json import re from multiprocessing import Lock, RLock class Mongo : lock = RLock() """ Basic mongodb functions are captured here """ def __init__(self,**args): """ :dbname database name/identifier :host host and port of the database by default localhost:27017 :username username for authentication :password password for current user """ self.mechanism= 'SCRAM-SHA-256' if 'mechanism' not in args else args['mechanism'] # authSource=(args['authSource'] if 'authSource' in args else self.dbname) self._lock = False if 'lock' not in args else args['lock'] username = password = None if 'auth_file' in args : _info = json.loads((open(args['auth_file'])).read()) else: _info = {} _args = dict(args,**_info) for key in _args : if key in ['username','password'] : username = _args['username'] if key=='username' else username password = _args['password'] if key == 'password' else password continue value = _args[key] self.setattr(key,value) # # Let us perform aliasing in order to remain backwards compatible self.dbname = self.db if hasattr(self,'db')else self.dbname self.uid = _args['table'] if 'table' in _args else (_args['doc'] if 'doc' in _args else (_args['collection'] if 'collection' in _args else None)) if username and password : self.client = MongoClient(self.host, username=username, password=password , authSource=self.authSource, authMechanism=self.mechanism) else: self.client = MongoClient(self.host,maxPoolSize=10000) self.db = self.client[self.dbname] def isready(self): p = self.dbname in self.client.list_database_names() q = self.uid in self.client[self.dbname].list_collection_names() return p and q def setattr(self,key,value): _allowed = ['host','port','db','doc','authSource','mechanism'] if key in _allowed : setattr(self,key,value) pass def close(self): self.client.close() def meta(self,**_args): return [] class MongoReader(Mongo,Reader): """ This class will read from a mongodb data store and return the content of a document (not a collection) """ def __init__(self,**args): Mongo.__init__(self,**args) def read(self,**args): if 'mongo' in args or 'cmd' in args: # # @TODO: cmd = args['mongo'] if 'mongo' in args else args['cmd'] if "aggregate" in cmd : if "allowDiskUse" not in cmd : cmd["allowDiskUse"] = True if "cursor" not in cmd : cmd["cursor"] = {} r = [] out = self.db.command(cmd) #@TODO: consider using a yield (generator) works wonders while True : if 'values' in out : r += out['values'] if 'cursor' in out : key = 'firstBatch' if 'firstBatch' in out['cursor'] else 'nextBatch' else: key = 'n' if 'cursor' in out and out['cursor'][key] : r += list(out['cursor'][key]) elif key in out and out[key]: r.append (out[key]) # yield out['cursor'][key] if key not in ['firstBatch','nextBatch'] or ('cursor' in out and out['cursor']['id'] == 0) : break else: out = self.db.command({"getMore":out['cursor']['id'],"collection":out['cursor']['ns'].split(".")[-1]}) return pd.DataFrame(r) else: collection = self.db[self.uid] _filter = args['filter'] if 'filter' in args else {} _df = pd.DataFrame(collection.find(_filter)) columns = _df.columns.tolist()[1:] return _df[columns] def view(self,**args): """ This function is designed to execute a view (map/reduce) operation """ pass class MongoWriter(Mongo,Writer): """ This class is designed to write to a mongodb collection within a database """ def __init__(self,**args): Mongo.__init__(self,**args) def upload(self,**args) : """ This function will upload a file to the current database (using GridFS) :param data binary stream/text to be stored :param filename filename to be used :param encoding content_encoding (default utf-8) """ if 'encoding' not in args : args['encoding'] = 'utf-8' gfs = GridFS(self.db) gfs.put(**args) def archive(self): """ This function will archive documents to the """ collection = self.db[self.uid] rows = list(collection.find()) for row in rows : if type(row['_id']) == ObjectId : row['_id'] = str(row['_id']) stream = Binary(json.dumps(collection).encode()) collection.delete_many({}) now = "-".join([str(datetime.now().year()),str(datetime.now().month), str(datetime.now().day)]) name = ".".join([self.uid,'archive',now])+".json" description = " ".join([self.uid,'archive',str(len(rows))]) self.upload(filename=name,data=stream,description=description,content_type='application/json') # gfs = GridFS(self.db) # gfs.put(filename=name,description=description,data=stream,encoding='utf-8') # self.write({{"filename":name,"file":stream,"description":descriptions}}) pass def write(self,info,**_args): """ This function will write to a given collection i.e add a record to a collection (no updates) @param info new record in the collection to be added """ # document = self.db[self.uid].find() #collection = self.db[self.uid] # if type(info) == list : # self.db[self.uid].insert_many(info) # else: try: _uid = self.uid if 'doc' not in _args else _args['doc'] if self._lock : Mongo.lock.acquire() if type(info) == list or type(info) == pd.DataFrame : self.db[_uid].insert_many(info if type(info) == list else info.to_dict(orient='records')) else: self.db[_uid].insert_one(info) finally: if self._lock : Mongo.lock.release() def set(self,document): """ if no identifier is provided the function will delete the entire collection and set the new document. Please use this function with great care (archive the content first before using it... for safety) """ collection = self.db[self.uid] if collection.count_document() > 0 and '_id' in document: id = document['_id'] del document['_id'] collection.find_one_and_replace({'_id':id},document) else: collection.delete_many({}) self.write(info) def close(self): Mongo.close(self) # collecton.update_one({"_id":self.uid},document,True)