add oracle connectors

examples/oracle/lta_duplicate_unspecified_localhost.args

+--datasource=oracle
+--oracle_lib_dir=D:\oracle\instantclient_21_10
+--connector=lta.DuplicateUnspecified
+--data_host=awtier0:tier123@db.test.lofar.target.rug.nl:1521
+--adex_backend_host=http://localhost:8000/adex_backend/
+--adex_resource=ancillary_dp/create
+--adex_token=9519e433ba37487f1a18121dfb1957d992fbb790
+--clear_collection
+--batch_size=10000
+--collection=apertif-dr1
+--simulate_post
\ No newline at end of file

scraper/main.py

 import os, sys, argparse
 from scraper.vo import vo_scraper
 from scraper.postgres import postgres_scraper
+from scraper.oracle import oracle_scraper
 import scraper
 
 def main():
@@ -37,6 +38,9 @@ def main():
     parser.add_argument("--data_host",
                         default="https://vo.astron.nl/tap/",
                         help="service/table, either VO or postgres. Examples: https://vo.astron.nl/tap/apertif_dr1.continuum_images, postgres:postgres@localhost:5432/alta")
+    parser.add_argument("--oracle_lib_dir",
+                        default="D:\oracle\instantclient_21_10",
+                        help="Directory where oracle client libraries are installed (only needed when using oracle connectors and the oracle libraries are not available on the path")
 
     parser.add_argument("--connector",
                         default="lotss_dr2_mosaics_connector",
@@ -102,5 +106,8 @@ def main():
     if args.datasource.upper() == 'POSTGRES':
         postgres_scraper.run(args)
 
+    if args.datasource.upper() == 'ORACLE':
+        oracle_scraper.run(args)
+
 if __name__ == '__main__':
     main()

scraper/oracle/connectors/lta.py

+import datetime
+
+
+class DuplicateUnspecified():
+    """
+    This is the (Postgres) connector to translate APERTIF inspectionplots to ancillery dataproducts in ADEX
+    """
+
+    def __init__(self):
+        self.sql_select_statement = """
+        SELECT unspec_dp.filename, COUNT(*) AS Occurrence
+        FROM AWOPER.UnspecifiedDataProduct unspec_dp
+        GROUP BY unspec_dp.filename HAVING COUNT(*)>1
+        """
+
+    def translate(self, row, args):
+        """
+        parse the specific row that comes from the postgres SQL query (sql_select_statement),
+        and translate it into the standard json payload for posting to the ADEX backend REST API
+
+        :param row: the results from the SQL query to a postgres service
+        :param args: the commandline arguments, but only args.collection is currently used
+        :return: payload: the json payload for the post to the ADEX backend
+        """
+        payload = dict(
+            name=row[0],
+            count = row[1]
+        )
+
+        return payload

scraper/oracle/oracle_scraper.py

+
+import cx_Oracle
+import datetime
+
+from scraper.adex_io import ADEX
+from scraper.oracle.connectors import lta
+
+def parse_database_url(url):
+    """"
+    parse a database url like: awtier0:<password>@db.lofar.target.rug.nl:1521
+    and cut it up in convenient parts for the psycopg2.connect
+    :param url: url that describes a database connection
+    :return: user, password, host, database, db_port
+    """
+    # parse database url like: awtier0:<password>>@db.lofar.target.rug.nl:1521
+
+    if "oracle://" in url:
+        url = url.replace('oracle://','')
+
+    userpass = url.split('@')[0]
+    user = userpass.split(':')[0]
+    password = userpass.split(':')[1]
+
+    host_and_port = url.split('@')[1]
+    host     = host_and_port.split(":")[0]
+    db_port  = host_and_port.split(":")[1]
+
+    return user, password, host, db_port
+
+def run(args):
+    """"
+    run the scraper Oracle functionality with the parameters that come in through args
+    :param args: the object with commandline parameters
+    :return
+    """
+
+    print('oracle_scraper.run...')
+
+    try:
+        # init an ADEX instance
+        adex = ADEX(args)
+        adex.check_clear_resources(args)
+
+        # instantiate connector for translation from oracle to ADEX
+        connector_module,connector_name = args.connector.split('.')
+
+        if connector_module.upper() == 'LTA':
+            connector_class = getattr(lta, connector_name)
+            connector = connector_class()
+
+        # get the credentials and connection info from the data_host parameter
+        user, password, host, db_port = parse_database_url(args.data_host)
+
+        # if the oracle client library is given as a parameter, then initialize it
+        if args.oracle_lib_dir:
+            cx_Oracle.init_oracle_client(lib_dir=args.oracle_lib_dir)
+
+        # connect to oracle database
+        LTADSN = cx_Oracle.makedsn(host, db_port, service_name=host)
+        source_connection = cx_Oracle.connect(
+            dsn=LTADSN,
+            user=user,
+            password=password)
+
+        source_cursor = source_connection.cursor()
+
+        # read the data (oracle is fast enough to not use batches)
+        print('fetching records from the oracle database...')
+
+        source_cursor.execute(connector.sql_select_statement)
+        rows = source_cursor.fetchall()
+        count = len(rows)
+        print(f"{count} records fetched from {args.data_host}")
+
+        # iterate the results and store them in the adex_cache database
+        records = []
+        t1 = datetime.datetime.now()
+
+        for row in rows:
+            record = connector.translate(row, args)
+            if not record:
+                continue
+
+            # construct a list of records
+            records.append(record)
+
+        # post to ADEX in batches
+        t2 = datetime.datetime.now()
+        print(f"{count} translated and ready to post {args.adex_backend_host} in {t2 - t1}")
+        batch = []
+        total_count = 0
+
+        for record in records:
+            batch.append(record)
+
+            # when reaching the batch_size, post to ADEX backend
+            if len(batch) == int(args.batch_size):
+                total_count = total_count + len(batch)
+
+                t1 = datetime.datetime.now()
+                if not args.simulate_post:
+                    adex.do_POST_json(args.adex_resource, batch)
+                t2 = datetime.datetime.now()
+
+                print(f"{len(batch)} ({total_count}) posted to {args.adex_backend_host} in {t2-t1}")
+                batch.clear()
+
+        # post the remainder
+        t1 = datetime.datetime.now()
+        if not args.simulate_post:
+            adex.do_POST_json(args.adex_resource, batch)
+        t2 = datetime.datetime.now()
+        total_count = total_count + len(batch)
+        print(f"{len(batch)} ({total_count}) posted to {args.adex_backend_host} in {t2 - t1}")
+
+
+    except Exception as error:
+        print(f"ERROR: {error}")
+        return
+

scraper/vo/connectors/Linc.py

@@ -22,6 +22,9 @@ class LincSkymap():
         duration = float(row['t_end']) - float(row['t_start'])
         #sampling_time = duration / time_samples
 
+        # do we need this is to link activities to dataproducts? or can we use row['activity'], which contains the SAS_ID.
+        pipeline_run_id = row['pipeline_run_id']
+
         payload = dict(
             pid=row['imageTitle'],
             name=row['imageTitle'],
@@ -45,6 +48,8 @@ class LincSkymap():
             PSF_size=None,
             #sky_footprint=str(row['s_region']),
             sky_footprint=None,
+            # is this enough? or should the dataproducts be linked to the pipeline through 'pipeline_run_id' instead?
+
             dataset_id=str(row['activity']),
             collection=args.collection,
 
@@ -52,7 +57,6 @@ class LincSkymap():
             pipeline_version=row['pipeline_version'],
         )
 
-        # are these parameters that we can create the Acitivies with?
         return payload