mirror of
https://github.com/ilri/dspace-statistics-api.git
synced 2024-12-22 20:52:19 +01:00
Refactor database code to use a context manager
Instead of opening one global persistent database connection when the application I am now abstracting it to a class that I can use in combination with Python's "with" context. Both connections and cursors are kept for the context of each "with" block and closed automatically when exiting. See: https://alysivji.github.io/managing-resources-with-context-managers-pythonic.html See: http://initd.org/psycopg/docs/connection.html#connection.close
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@ -1,9 +1,6 @@
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from .database import database_connection
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from .database import DatabaseManager
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import falcon
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db = database_connection()
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db.set_session(readonly=True)
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class RootResource:
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def on_get(self, req, resp):
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@ -21,23 +18,23 @@ class AllItemsResource:
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page = req.get_param_as_int("page", min=0) or 0
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offset = limit * page
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cursor = db.cursor()
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with DatabaseManager() as db:
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db.set_session(readonly=True)
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# get total number of items so we can estimate the pages
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cursor.execute('SELECT COUNT(id) FROM items')
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pages = round(cursor.fetchone()[0] / limit)
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with db.cursor() as cursor:
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# get total number of items so we can estimate the pages
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cursor.execute('SELECT COUNT(id) FROM items')
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pages = round(cursor.fetchone()[0] / limit)
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# get statistics, ordered by id, and use limit and offset to page through results
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cursor.execute('SELECT id, views, downloads FROM items ORDER BY id ASC LIMIT {} OFFSET {}'.format(limit, offset))
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# get statistics, ordered by id, and use limit and offset to page through results
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cursor.execute('SELECT id, views, downloads FROM items ORDER BY id ASC LIMIT {} OFFSET {}'.format(limit, offset))
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# create a list to hold dicts of item stats
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statistics = list()
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# create a list to hold dicts of item stats
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statistics = list()
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# iterate over results and build statistics object
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for item in cursor:
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statistics.append({'id': item['id'], 'views': item['views'], 'downloads': item['downloads']})
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cursor.close()
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# iterate over results and build statistics object
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for item in cursor:
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statistics.append({'id': item['id'], 'views': item['views'], 'downloads': item['downloads']})
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message = {
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'currentPage': page,
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@ -53,25 +50,27 @@ class ItemResource:
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def on_get(self, req, resp, item_id):
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"""Handles GET requests"""
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cursor = db.cursor()
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cursor.execute('SELECT views, downloads FROM items WHERE id={}'.format(item_id))
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if cursor.rowcount == 0:
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raise falcon.HTTPNotFound(
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title='Item not found',
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description='The item with id "{}" was not found.'.format(item_id)
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)
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else:
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results = cursor.fetchone()
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with DatabaseManager() as db:
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db.set_session(readonly=True)
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statistics = {
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'id': item_id,
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'views': results['views'],
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'downloads': results['downloads']
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}
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with db.cursor() as cursor:
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cursor = db.cursor()
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cursor.execute('SELECT views, downloads FROM items WHERE id={}'.format(item_id))
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if cursor.rowcount == 0:
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raise falcon.HTTPNotFound(
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title='Item not found',
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description='The item with id "{}" was not found.'.format(item_id)
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)
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else:
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results = cursor.fetchone()
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resp.media = statistics
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statistics = {
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'id': item_id,
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'views': results['views'],
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'downloads': results['downloads']
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}
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cursor.close()
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resp.media = statistics
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api = application = falcon.API()
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@ -7,9 +7,17 @@ import psycopg2
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import psycopg2.extras
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def database_connection():
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connection = psycopg2.connect("dbname={} user={} password={} host={} port={}".format(DATABASE_NAME, DATABASE_USER, DATABASE_PASS, DATABASE_HOST, DATABASE_PORT), cursor_factory=psycopg2.extras.DictCursor)
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class DatabaseManager():
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'''Manage database connection.'''
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return connection
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def __init__(self):
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self._connection_uri = 'dbname={} user={} password={} host={} port={}'.format(DATABASE_NAME, DATABASE_USER, DATABASE_PASS, DATABASE_HOST, DATABASE_PORT)
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def __enter__(self):
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self._connection = psycopg2.connect(self._connection_uri, cursor_factory=psycopg2.extras.DictCursor)
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return self._connection
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def __exit__(self, exc_type, exc_value, exc_traceback):
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self._connection.close()
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# vim: set sw=4 ts=4 expandtab:
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@ -29,7 +29,7 @@
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# See: https://solrclient.readthedocs.io/en/latest/SolrClient.html
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# See: https://wiki.duraspace.org/display/DSPACE/Solr
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from .database import database_connection
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from .database import DatabaseManager
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import json
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import psycopg2.extras
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from .solr import solr_connection
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@ -63,41 +63,39 @@ def index_views():
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results_num_pages = int(results_totalNumFacets / results_per_page)
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results_current_page = 0
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cursor = db.cursor()
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with DatabaseManager() as db:
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with db.cursor() as cursor:
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# create an empty list to store values for batch insertion
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data = []
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# create an empty list to store values for batch insertion
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data = []
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while results_current_page <= results_num_pages:
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print('Indexing item views (page {} of {})'.format(results_current_page, results_num_pages))
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while results_current_page <= results_num_pages:
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print('Indexing item views (page {} of {})'.format(results_current_page, results_num_pages))
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res = solr.query('statistics', {
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'q': 'type:2',
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'fq': 'isBot:false AND statistics_type:view',
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'facet': True,
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'facet.field': 'id',
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'facet.mincount': 1,
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'facet.limit': results_per_page,
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'facet.offset': results_current_page * results_per_page
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}, rows=0)
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res = solr.query('statistics', {
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'q': 'type:2',
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'fq': 'isBot:false AND statistics_type:view',
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'facet': True,
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'facet.field': 'id',
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'facet.mincount': 1,
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'facet.limit': results_per_page,
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'facet.offset': results_current_page * results_per_page
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}, rows=0)
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# SolrClient's get_facets() returns a dict of dicts
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views = res.get_facets()
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# in this case iterate over the 'id' dict and get the item ids and views
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for item_id, item_views in views['id'].items():
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data.append((item_id, item_views))
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# SolrClient's get_facets() returns a dict of dicts
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views = res.get_facets()
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# in this case iterate over the 'id' dict and get the item ids and views
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for item_id, item_views in views['id'].items():
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data.append((item_id, item_views))
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# do a batch insert of values from the current "page" of results
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sql = 'INSERT INTO items(id, views) VALUES %s ON CONFLICT(id) DO UPDATE SET views=excluded.views'
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psycopg2.extras.execute_values(cursor, sql, data, template='(%s, %s)')
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db.commit()
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# do a batch insert of values from the current "page" of results
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sql = 'INSERT INTO items(id, views) VALUES %s ON CONFLICT(id) DO UPDATE SET views=excluded.views'
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psycopg2.extras.execute_values(cursor, sql, data, template='(%s, %s)')
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db.commit()
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# clear all items from the list so we can populate it with the next batch
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data.clear()
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# clear all items from the list so we can populate it with the next batch
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data.clear()
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results_current_page += 1
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cursor.close()
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results_current_page += 1
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def index_downloads():
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@ -123,53 +121,55 @@ def index_downloads():
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results_num_pages = int(results_totalNumFacets / results_per_page)
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results_current_page = 0
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cursor = db.cursor()
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with DatabaseManager() as db:
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with db.cursor() as cursor:
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# create an empty list to store values for batch insertion
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data = []
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# create an empty list to store values for batch insertion
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data = []
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while results_current_page <= results_num_pages:
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print('Indexing item downloads (page {} of {})'.format(results_current_page, results_num_pages))
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while results_current_page <= results_num_pages:
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print('Indexing item downloads (page {} of {})'.format(results_current_page, results_num_pages))
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res = solr.query('statistics', {
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'q': 'type:0',
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'fq': 'isBot:false AND statistics_type:view AND bundleName:ORIGINAL',
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'facet': True,
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'facet.field': 'owningItem',
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'facet.mincount': 1,
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'facet.limit': results_per_page,
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'facet.offset': results_current_page * results_per_page
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}, rows=0)
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res = solr.query('statistics', {
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'q': 'type:0',
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'fq': 'isBot:false AND statistics_type:view AND bundleName:ORIGINAL',
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'facet': True,
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'facet.field': 'owningItem',
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'facet.mincount': 1,
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'facet.limit': results_per_page,
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'facet.offset': results_current_page * results_per_page
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}, rows=0)
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# SolrClient's get_facets() returns a dict of dicts
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downloads = res.get_facets()
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# in this case iterate over the 'owningItem' dict and get the item ids and downloads
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for item_id, item_downloads in downloads['owningItem'].items():
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data.append((item_id, item_downloads))
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# SolrClient's get_facets() returns a dict of dicts
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downloads = res.get_facets()
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# in this case iterate over the 'owningItem' dict and get the item ids and downloads
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for item_id, item_downloads in downloads['owningItem'].items():
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data.append((item_id, item_downloads))
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# do a batch insert of values from the current "page" of results
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sql = 'INSERT INTO items(id, downloads) VALUES %s ON CONFLICT(id) DO UPDATE SET downloads=excluded.downloads'
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psycopg2.extras.execute_values(cursor, sql, data, template='(%s, %s)')
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db.commit()
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# do a batch insert of values from the current "page" of results
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sql = 'INSERT INTO items(id, downloads) VALUES %s ON CONFLICT(id) DO UPDATE SET downloads=excluded.downloads'
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psycopg2.extras.execute_values(cursor, sql, data, template='(%s, %s)')
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db.commit()
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# clear all items from the list so we can populate it with the next batch
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data.clear()
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# clear all items from the list so we can populate it with the next batch
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data.clear()
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results_current_page += 1
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cursor.close()
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results_current_page += 1
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db = database_connection()
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solr = solr_connection()
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# create table to store item views and downloads
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cursor = db.cursor()
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cursor.execute('''CREATE TABLE IF NOT EXISTS items
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print("gonna create the table")
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with DatabaseManager() as db:
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with db.cursor() as cursor:
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# create table to store item views and downloads
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cursor.execute('''CREATE TABLE IF NOT EXISTS items
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(id INT PRIMARY KEY, views INT DEFAULT 0, downloads INT DEFAULT 0)''')
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# commit the table creation before closing the database connection
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db.commit()
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index_views()
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index_downloads()
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db.close()
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# vim: set sw=4 ts=4 expandtab:
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