From b1388e4f6660c11e78498a530620b06e70ed7371 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ale=C5=A1=20Smodi=C5=A1?= <aless@guru.si>
Date: Thu, 13 Aug 2015 16:55:10 +0200
Subject: The conversion script SQLite -> PostgreSQL:  - auth_user ->
 codeq_user,  - tutor_attempt -> solution.

---
 sqlite_to_pg.py | 145 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 sqlite_to_pg.py

diff --git a/sqlite_to_pg.py b/sqlite_to_pg.py
new file mode 100644
index 0000000..25059b2
--- /dev/null
+++ b/sqlite_to_pg.py
@@ -0,0 +1,145 @@
+#!/usr/bin/python3
+# coding=utf-8
+
+import sys, json, sqlite3, psycopg2
+
+sqc = None # sqlite3 connection handle
+pgc = None # postgresql connection handle
+
+def log(line):
+    sys.stdout.write('{0}\n'.format(line))
+
+def _no_cleanup(row, data):
+    pass
+
+def copy_table(src_qry, dst_qry, conversion_fn, cleanup_fn, sequence):
+    cleanup_fn = cleanup_fn or _no_cleanup
+    src_cur = sqc.cursor()
+    try:
+        dst_cur = pgc.cursor()
+        try:
+            row = None
+            for row in src_cur.execute(src_qry):
+                new_row, cleanup_data = conversion_fn(row)
+                dst_cur.execute(dst_qry, new_row)
+                cleanup_fn(new_row, cleanup_data)
+            if sequence and row:
+                dst_cur.execute("select setval('{0}', {1})".format(sequence, row[0]))
+            pgc.commit()
+        except:
+            pgc.rollback()
+            raise
+        finally:
+            dst_cur.close()
+    finally:
+        src_cur.close()
+
+def convert_auth_user(row):
+    log('Converting auth_user id={0}'.format(row[0]))
+    return (row[0], row[1], row[2], row[3], row[4], row[5], row[6] != 0, row[7] != 0, row[8] != 0, row[9], row[10]), None
+
+
+def _handle_trace_insert(trace, i):
+    length = (trace[i+2] << 8) + trace[i+3]
+    js = {
+        'typ': 'ins',
+        'off': (trace[i] << 8) + trace[i+1],
+        'txt': trace[i+4:i+4+length].decode()
+    }
+    return js, i + 4 + length
+
+def _handle_trace_remove(trace, i):
+    js = {
+        'typ': 'rm',
+        'off': (trace[i] << 8) + trace[i+1],
+        'len': (trace[i+2] << 8) + trace[i+3]
+    }
+    return js, i + 4
+
+def _handle_trace_solve(trace, i):
+    length = (trace[i] << 8) + trace[i+1]
+    js = {
+        'typ': 'slv',
+        'qry': trace[i+2:i+2+length].decode()
+    }
+    return js, i + 2 + length
+
+def _handle_trace_solve_all(trace, i):
+    length = (trace[i] << 8) + trace[i+1]
+    js = {
+        'typ': 'slva',
+        'qry': trace[i+2:i+2+length].decode()
+    }
+    return js, i + 2 + length
+
+def _handle_trace_test(trace, i):
+    js = {
+        'typ': 'tst',
+        'tot': trace[i],
+        'pas': trace[i+1]
+    }
+    return js, i + 2
+
+def _handle_trace_next(trace, i):
+    return {'typ': 'nxt'}, i
+
+def _handle_trace_stop(trace, i):
+    return {'typ': 'stp'}, i
+
+def _handle_trace_hint(trace, i):
+    return {'typ': 'hnt'}, i
+
+_trace_handler = {
+    1: _handle_trace_insert,    # insert
+    2: _handle_trace_remove,    # remove
+    3: _handle_trace_solve,     # solve
+    4: _handle_trace_solve_all, # solve all
+    5: _handle_trace_next,      # next solution
+    7: _handle_trace_stop,      # stop/end
+    8: _handle_trace_test,      # test
+    9: _handle_trace_hint       # hint
+}
+
+def convert_trace(trace, i):
+    type = trace[i]
+    i += 1
+    dt = int(((trace[i] << 8) + (trace[i+1])) * 100.0)
+    i += 2
+    handler = _trace_handler.get(type)
+    if handler:
+        js, i = handler(trace, i)
+        js['dt'] = dt
+        return json.dumps(js), i
+    return None, i
+
+def convert_attempt(row):
+    log('Converting tutor_attempt id={0}'.format(row[0]))
+    old_trace = bytes(row[5])
+    new_trace = []
+    n = len(old_trace)
+    i = 0
+    while i < n:
+        trace, i = convert_trace(old_trace, i)
+        if trace:
+            new_trace.append(trace)
+    return (row[0], row[1] != 0, row[2], row[3], row[4], '[' + ','.join(new_trace) + ']'), None
+
+if __name__ == '__main__':
+    sqc = sqlite3.connect('db.sqlite3')
+    pgc = psycopg2.connect(host='localhost', port=5432, database='codeq', user='codeq', password='c0d3q')
+    pgc.autocommit = False
+    try:
+        log('Copying auth_user -> codeq_user')
+        copy_table(
+            'select id, username, password, first_name, last_name, email, is_superuser, is_staff, is_active, date_joined, last_login from auth_user order by id',
+            'insert into codeq_user (id, username, password, first_name, last_name, email, is_superuser, is_staff, is_active, date_joined, last_login) values (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)',
+            convert_auth_user, None, 'codeq_user_id_seq')
+
+        log('Copying tutor_attempt -> solution')
+        copy_table(
+            'select id, done, content, problem_id, user_id, trace from tutor_attempt order by id',
+            'insert into solution (id, done, content, problem_id, codeq_user_id, trace) values (%s, %s, %s, %s, %s, %s)',
+            convert_attempt, None, 'solution_id_seq')
+    finally:
+        sqc.close()
+        pgc.close()
-- 
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