bitbake: bitbake: hashserv: Add hash equivalence reference server

Implements a reference implementation of the hash equivalence server.
This server has minimal dependencies (and no dependencies outside of the
standard Python library), and implements the minimum required to be a
conforming hash equivalence server.

[YOCTO #13030]

(Bitbake rev: 1bb2ad0b44b94ee04870bf3f7dac4e663bed6e4d)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 152 insertions, 0 deletions

diff --git a/bitbake/lib/hashserv/__init__.py b/bitbake/lib/hashserv/__init__.py
new file mode 100644
index 0000000000..46bca7cab3
--- /dev/null
+++ b/bitbake/lib/hashserv/__init__.py
@@ -0,0 +1,152 @@
+# Copyright (C) 2018 Garmin Ltd.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+from http.server import BaseHTTPRequestHandler, HTTPServer
+import contextlib
+import urllib.parse
+import sqlite3
+import json
+import traceback
+import logging
+from datetime import datetime
+
+logger = logging.getLogger('hashserv')
+
+class HashEquivalenceServer(BaseHTTPRequestHandler):
+    def log_message(self, f, *args):
+        logger.debug(f, *args)
+
+    def do_GET(self):
+        try:
+            p = urllib.parse.urlparse(self.path)
+
+            if p.path != self.prefix + '/v1/equivalent':
+                self.send_error(404)
+                return
+
+            query = urllib.parse.parse_qs(p.query, strict_parsing=True)
+            method = query['method'][0]
+            taskhash = query['taskhash'][0]
+
+            d = None
+            with contextlib.closing(self.db.cursor()) as cursor:
+                cursor.execute('SELECT taskhash, method, unihash FROM tasks_v1 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1',
+                        {'method': method, 'taskhash': taskhash})
+
+                row = cursor.fetchone()
+
+                if row is not None:
+                    logger.debug('Found equivalent task %s', row['taskhash'])
+                    d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}
+
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/json; charset=utf-8')
+            self.end_headers()
+            self.wfile.write(json.dumps(d).encode('utf-8'))
+        except:
+            logger.exception('Error in GET')
+            self.send_error(400, explain=traceback.format_exc())
+            return
+
+    def do_POST(self):
+        try:
+            p = urllib.parse.urlparse(self.path)
+
+            if p.path != self.prefix + '/v1/equivalent':
+                self.send_error(404)
+                return
+
+            length = int(self.headers['content-length'])
+            data = json.loads(self.rfile.read(length).decode('utf-8'))
+
+            with contextlib.closing(self.db.cursor()) as cursor:
+                cursor.execute('''
+                    SELECT taskhash, method, unihash FROM tasks_v1 WHERE method=:method AND outhash=:outhash
+                    ORDER BY CASE WHEN taskhash=:taskhash THEN 1 ELSE 2 END,
+                        created ASC
+                    LIMIT 1
+                    ''', {k: data[k] for k in ('method', 'outhash', 'taskhash')})
+
+                row = cursor.fetchone()
+
+                if row is None or row['taskhash'] != data['taskhash']:
+                    unihash = data['unihash']
+                    if row is not None:
+                        unihash = row['unihash']
+
+                    insert_data = {
+                            'method': data['method'],
+                            'outhash': data['outhash'],
+                            'taskhash': data['taskhash'],
+                            'unihash': unihash,
+                            'created': datetime.now()
+                            }
+
+                    for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):
+                        if k in data:
+                            insert_data[k] = data[k]
+
+                    cursor.execute('''INSERT INTO tasks_v1 (%s) VALUES (%s)''' % (
+                            ', '.join(sorted(insert_data.keys())),
+                            ', '.join(':' + k for k in sorted(insert_data.keys()))),
+                        insert_data)
+
+                    logger.info('Adding taskhash %s with unihash %s', data['taskhash'], unihash)
+                    cursor.execute('SELECT taskhash, method, unihash FROM tasks_v1 WHERE id=:id', {'id': cursor.lastrowid})
+                    row = cursor.fetchone()
+
+                    self.db.commit()
+
+                d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}
+
+                self.send_response(200)
+                self.send_header('Content-Type', 'application/json; charset=utf-8')
+                self.end_headers()
+                self.wfile.write(json.dumps(d).encode('utf-8'))
+        except:
+            logger.exception('Error in POST')
+            self.send_error(400, explain=traceback.format_exc())
+            return
+
+def create_server(addr, db, prefix=''):
+    class Handler(HashEquivalenceServer):
+        pass
+
+    Handler.prefix = prefix
+    Handler.db = db
+    db.row_factory = sqlite3.Row
+
+    with contextlib.closing(db.cursor()) as cursor:
+        cursor.execute('''
+            CREATE TABLE IF NOT EXISTS tasks_v1 (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                method TEXT NOT NULL,
+                outhash TEXT NOT NULL,
+                taskhash TEXT NOT NULL,
+                unihash TEXT NOT NULL,
+                created DATETIME,
+
+                -- Optional fields
+                owner TEXT,
+                PN TEXT,
+                PV TEXT,
+                PR TEXT,
+                task TEXT,
+                outhash_siginfo TEXT
+                )
+            ''')
+
+    logger.info('Starting server on %s', addr)
+    return HTTPServer(addr, Handler)