1 files changed, 224 insertions, 203 deletions

diff --git a/bitbake/lib/prserv/db.py b/bitbake/lib/prserv/db.py
index cb2a2461e0..2da493ddf5 100644
--- a/bitbake/lib/prserv/db.py
+++ b/bitbake/lib/prserv/db.py
@@ -1,4 +1,6 @@
 #
+# Copyright BitBake Contributors
+#
 # SPDX-License-Identifier: GPL-2.0-only
 #
 
@@ -6,19 +8,13 @@ import logging
 import os.path
 import errno
 import prserv
-import time
+import sqlite3
 
-try:
-    import sqlite3
-except ImportError:
-    from pysqlite2 import dbapi2 as sqlite3
+from contextlib import closing
+from . import increase_revision, revision_greater, revision_smaller
 
 logger = logging.getLogger("BitBake.PRserv")
 
-sqlversion = sqlite3.sqlite_version_info
-if sqlversion[0] < 3 or (sqlversion[0] == 3 and sqlversion[1] < 3):
-    raise Exception("sqlite3 version 3.3.0 or later is required.")
-
 #
 # "No History" mode - for a given query tuple (version, pkgarch, checksum),
 # the returned value will be the largest among all the values of the same
@@ -27,212 +23,232 @@ if sqlversion[0] < 3 or (sqlversion[0] == 3 and sqlversion[1] < 3):
 # "History" mode - Return a new higher value for previously unseen query
 # tuple (version, pkgarch, checksum), otherwise return historical value.
 # Value can decrement if returning to a previous build.
-#
 
 class PRTable(object):
-    def __init__(self, conn, table, nohist):
+    def __init__(self, conn, table, read_only):
         self.conn = conn
-        self.nohist = nohist
-        self.dirty = False
-        if nohist:
-            self.table = "%s_nohist" % table 
-        else:
-            self.table = "%s_hist" % table 
-
-        self._execute("CREATE TABLE IF NOT EXISTS %s \
-                    (version TEXT NOT NULL, \
-                    pkgarch TEXT NOT NULL,  \
-                    checksum TEXT NOT NULL, \
-                    value INTEGER, \
-                    PRIMARY KEY (version, pkgarch, checksum));" % self.table)
-
-    def _execute(self, *query):
-        """Execute a query, waiting to acquire a lock if necessary"""
-        start = time.time()
-        end = start + 20
-        while True:
-            try:
-                return self.conn.execute(*query)
-            except sqlite3.OperationalError as exc:
-                if 'is locked' in str(exc) and end > time.time():
-                    continue
-                raise exc
-
-    def sync(self):
-        self.conn.commit()
-        self._execute("BEGIN EXCLUSIVE TRANSACTION")
-
-    def sync_if_dirty(self):
-        if self.dirty:
-            self.sync()
-            self.dirty = False
-
-    def _getValueHist(self, version, pkgarch, checksum):
-        data=self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? AND checksum=?;" % self.table,
-                           (version, pkgarch, checksum))
-        row=data.fetchone()
-        if row is not None:
-            return row[0]
-        else:
-            #no value found, try to insert
-            try:
-                self._execute("INSERT INTO %s VALUES (?, ?, ?, (select ifnull(max(value)+1,0) from %s where version=? AND pkgarch=?));"
-                           % (self.table,self.table),
-                           (version,pkgarch, checksum,version, pkgarch))
-            except sqlite3.IntegrityError as exc:
-                logger.error(str(exc))
-
-            self.dirty = True
-
-            data=self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? AND checksum=?;" % self.table,
-                               (version, pkgarch, checksum))
+        self.read_only = read_only
+        self.table = table
+
+        # Creating the table even if the server is read-only.
+        # This avoids a race condition if a shared database
+        # is accessed by a read-only server first.
+
+        with closing(self.conn.cursor()) as cursor:
+            cursor.execute("CREATE TABLE IF NOT EXISTS %s \
+                        (version TEXT NOT NULL, \
+                        pkgarch TEXT NOT NULL,  \
+                        checksum TEXT NOT NULL, \
+                        value TEXT, \
+                        PRIMARY KEY (version, pkgarch, checksum, value));" % self.table)
+            self.conn.commit()
+
+    def _extremum_value(self, rows, is_max):
+        value = None
+
+        for row in rows:
+            current_value = row[0]
+            if value is None:
+                value = current_value
+            else:
+                if is_max:
+                    is_new_extremum = revision_greater(current_value, value)
+                else:
+                    is_new_extremum = revision_smaller(current_value, value)
+                if  is_new_extremum:
+                    value = current_value
+        return value
+
+    def _max_value(self, rows):
+        return self._extremum_value(rows, True)
+
+    def _min_value(self, rows):
+        return self._extremum_value(rows, False)
+
+    def test_package(self, version, pkgarch):
+        """Returns whether the specified package version is found in the database for the specified architecture"""
+
+        # Just returns the value if found or None otherwise
+        with closing(self.conn.cursor()) as cursor:
+            data=cursor.execute("SELECT value FROM %s WHERE version=? AND pkgarch=?;" % self.table,
+                               (version, pkgarch))
             row=data.fetchone()
             if row is not None:
-                return row[0]
+                return True
             else:
-                raise prserv.NotFoundError
-
-    def _getValueNohist(self, version, pkgarch, checksum):
-        data=self._execute("SELECT value FROM %s \
-                            WHERE version=? AND pkgarch=? AND checksum=? AND \
-                            value >= (select max(value) from %s where version=? AND pkgarch=?);" 
-                            % (self.table, self.table),
-                            (version, pkgarch, checksum, version, pkgarch))
-        row=data.fetchone()
-        if row is not None:
-            return row[0]
-        else:
-            #no value found, try to insert
-            try:
-                self._execute("INSERT OR REPLACE INTO %s VALUES (?, ?, ?, (select ifnull(max(value)+1,0) from %s where version=? AND pkgarch=?));"
-                               % (self.table,self.table),
-                               (version, pkgarch, checksum, version, pkgarch))
-            except sqlite3.IntegrityError as exc:
-                logger.error(str(exc))
-                self.conn.rollback()
-
-            self.dirty = True
-
-            data=self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? AND checksum=?;" % self.table,
-                               (version, pkgarch, checksum))
+                return False
+
+    def test_checksum_value(self, version, pkgarch, checksum, value):
+        """Returns whether the specified value is found in the database for the specified package, architecture and checksum"""
+
+        with closing(self.conn.cursor()) as cursor:
+            data=cursor.execute("SELECT value FROM %s WHERE version=? AND pkgarch=? and checksum=? and value=?;" % self.table,
+                               (version, pkgarch, checksum, value))
             row=data.fetchone()
             if row is not None:
-                return row[0]
+                return True
             else:
-                raise prserv.NotFoundError
+                return False
 
-    def getValue(self, version, pkgarch, checksum):
-        if self.nohist:
-            return self._getValueNohist(version, pkgarch, checksum)
-        else:
-            return self._getValueHist(version, pkgarch, checksum)
-
-    def _importHist(self, version, pkgarch, checksum, value):
-        val = None 
-        data = self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? AND checksum=?;" % self.table,
-                           (version, pkgarch, checksum))
-        row = data.fetchone()
-        if row is not None:
-            val=row[0]
+    def test_value(self, version, pkgarch, value):
+        """Returns whether the specified value is found in the database for the specified package and architecture"""
+
+        # Just returns the value if found or None otherwise
+        with closing(self.conn.cursor()) as cursor:
+            data=cursor.execute("SELECT value FROM %s WHERE version=? AND pkgarch=? and value=?;" % self.table,
+                               (version, pkgarch, value))
+            row=data.fetchone()
+            if row is not None:
+                return True
+            else:
+                return False
+
+
+    def find_package_max_value(self, version, pkgarch):
+        """Returns the greatest value for (version, pkgarch), or None if not found. Doesn't create a new value"""
+
+        with closing(self.conn.cursor()) as cursor:
+            data = cursor.execute("SELECT value FROM %s where version=? AND pkgarch=?;" % (self.table),
+                                 (version, pkgarch))
+            rows = data.fetchall()
+            value = self._max_value(rows)
+            return value
+
+    def find_value(self, version, pkgarch, checksum, history=False):
+        """Returns the value for the specified checksum if found or None otherwise."""
+
+        if history:
+            return self.find_min_value(version, pkgarch, checksum)
         else:
-            #no value found, try to insert
-            try:
-                self._execute("INSERT INTO %s VALUES (?, ?, ?, ?);"  % (self.table),
+            return self.find_max_value(version, pkgarch, checksum)
+
+
+    def _find_extremum_value(self, version, pkgarch, checksum, is_max):
+        """Returns the maximum (if is_max is True) or minimum (if is_max is False) value
+           for (version, pkgarch, checksum), or None if not found. Doesn't create a new value"""
+
+        with closing(self.conn.cursor()) as cursor:
+            data = cursor.execute("SELECT value FROM %s where version=? AND pkgarch=? AND checksum=?;" % (self.table),
+                                 (version, pkgarch, checksum))
+            rows = data.fetchall()
+            return self._extremum_value(rows, is_max)
+
+    def find_max_value(self, version, pkgarch, checksum):
+        return self._find_extremum_value(version, pkgarch, checksum, True)
+
+    def find_min_value(self, version, pkgarch, checksum):
+        return self._find_extremum_value(version, pkgarch, checksum, False)
+
+    def find_new_subvalue(self, version, pkgarch, base):
+        """Take and increase the greatest "<base>.y" value for (version, pkgarch), or return "<base>.0" if not found.
+        This doesn't store a new value."""
+
+        with closing(self.conn.cursor()) as cursor:
+            data = cursor.execute("SELECT value FROM %s where version=? AND pkgarch=? AND value LIKE '%s.%%';" % (self.table, base),
+                                 (version, pkgarch))
+            rows = data.fetchall()
+            value = self._max_value(rows)
+
+            if value is not None:
+                return increase_revision(value)
+            else:
+                return base + ".0"
+
+    def store_value(self, version, pkgarch, checksum, value):
+        """Store value in the database"""
+
+        if not self.read_only and not self.test_checksum_value(version, pkgarch, checksum, value):
+            with closing(self.conn.cursor()) as cursor:
+                cursor.execute("INSERT INTO %s VALUES (?, ?, ?, ?);"  % (self.table),
                            (version, pkgarch, checksum, value))
-            except sqlite3.IntegrityError as exc:
-                logger.error(str(exc))
+                self.conn.commit()
 
-            self.dirty = True
+    def _get_value(self, version, pkgarch, checksum, history):
 
-            data = self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? AND checksum=?;" % self.table,
-                           (version, pkgarch, checksum))
-            row = data.fetchone()
-            if row is not None:
-                val = row[0]
-        return val
+        max_value = self.find_package_max_value(version, pkgarch)
 
-    def _importNohist(self, version, pkgarch, checksum, value):
-        try:
-            #try to insert
-            self._execute("INSERT INTO %s VALUES (?, ?, ?, ?);"  % (self.table),
-                           (version, pkgarch, checksum,value))
-        except sqlite3.IntegrityError as exc:
-            #already have the record, try to update
-            try:
-                self._execute("UPDATE %s SET value=? WHERE version=? AND pkgarch=? AND checksum=? AND value<?"  
-                              % (self.table),
-                               (value,version,pkgarch,checksum,value))
-            except sqlite3.IntegrityError as exc:
-                logger.error(str(exc))
-
-        self.dirty = True
-
-        data = self._execute("SELECT value FROM %s WHERE version=? AND pkgarch=? AND checksum=? AND value>=?;" % self.table,
-                            (version,pkgarch,checksum,value))
-        row=data.fetchone()
-        if row is not None:
-            return row[0]
+        if max_value is None:
+            # version, pkgarch completely unknown. Return initial value.
+            return "0"
+
+        value = self.find_value(version, pkgarch, checksum, history)
+
+        if value is None:
+            # version, pkgarch found but not checksum. Create a new value from the maximum one
+            return increase_revision(max_value)
+
+        if history:
+            return value
+
+        # "no history" mode - If the value is not the maximum value for the package, need to increase it.
+        if max_value > value:
+            return increase_revision(max_value)
         else:
-            return None
+            return value
+
+    def get_value(self, version, pkgarch, checksum, history):
+        value = self._get_value(version, pkgarch, checksum, history)
+        if not self.read_only:
+            self.store_value(version, pkgarch, checksum, value)
+        return value
 
     def importone(self, version, pkgarch, checksum, value):
-        if self.nohist:
-            return self._importNohist(version, pkgarch, checksum, value)
-        else:
-            return self._importHist(version, pkgarch, checksum, value)
+        self.store_value(version, pkgarch, checksum, value)
+        return value
 
-    def export(self, version, pkgarch, checksum, colinfo):
+    def export(self, version, pkgarch, checksum, colinfo, history=False):
         metainfo = {}
-        #column info 
-        if colinfo:
-            metainfo['tbl_name'] = self.table
-            metainfo['core_ver'] = prserv.__version__
-            metainfo['col_info'] = []
-            data = self._execute("PRAGMA table_info(%s);" % self.table)
+        with closing(self.conn.cursor()) as cursor:
+            #column info
+            if colinfo:
+                metainfo["tbl_name"] = self.table
+                metainfo["core_ver"] = prserv.__version__
+                metainfo["col_info"] = []
+                data = cursor.execute("PRAGMA table_info(%s);" % self.table)
+                for row in data:
+                    col = {}
+                    col["name"] = row["name"]
+                    col["type"] = row["type"]
+                    col["notnull"] = row["notnull"]
+                    col["dflt_value"] = row["dflt_value"]
+                    col["pk"] = row["pk"]
+                    metainfo["col_info"].append(col)
+
+            #data info
+            datainfo = []
+
+            if history:
+                sqlstmt = "SELECT * FROM %s as T1 WHERE 1=1 " % self.table
+            else:
+                sqlstmt = "SELECT T1.version, T1.pkgarch, T1.checksum, T1.value FROM %s as T1, \
+                        (SELECT version, pkgarch, max(value) as maxvalue FROM %s GROUP BY version, pkgarch) as T2 \
+                        WHERE T1.version=T2.version AND T1.pkgarch=T2.pkgarch AND T1.value=T2.maxvalue " % (self.table, self.table)
+            sqlarg = []
+            where = ""
+            if version:
+                where += "AND T1.version=? "
+                sqlarg.append(str(version))
+            if pkgarch:
+                where += "AND T1.pkgarch=? "
+                sqlarg.append(str(pkgarch))
+            if checksum:
+                where += "AND T1.checksum=? "
+                sqlarg.append(str(checksum))
+
+            sqlstmt += where + ";"
+
+            if len(sqlarg):
+                data = cursor.execute(sqlstmt, tuple(sqlarg))
+            else:
+                data = cursor.execute(sqlstmt)
             for row in data:
-                col = {}
-                col['name'] = row['name']
-                col['type'] = row['type']
-                col['notnull'] = row['notnull']
-                col['dflt_value'] = row['dflt_value']
-                col['pk'] = row['pk']
-                metainfo['col_info'].append(col)
-
-        #data info
-        datainfo = []
-
-        if self.nohist:
-            sqlstmt = "SELECT T1.version, T1.pkgarch, T1.checksum, T1.value FROM %s as T1, \
-                    (SELECT version,pkgarch,max(value) as maxvalue FROM %s GROUP BY version,pkgarch) as T2 \
-                    WHERE T1.version=T2.version AND T1.pkgarch=T2.pkgarch AND T1.value=T2.maxvalue " % (self.table, self.table)
-        else:
-            sqlstmt = "SELECT * FROM %s as T1 WHERE 1=1 " % self.table
-        sqlarg = []
-        where = ""
-        if version:
-            where += "AND T1.version=? "
-            sqlarg.append(str(version))
-        if pkgarch:
-            where += "AND T1.pkgarch=? "
-            sqlarg.append(str(pkgarch))
-        if checksum:
-            where += "AND T1.checksum=? "
-            sqlarg.append(str(checksum))
-
-        sqlstmt += where + ";"
-
-        if len(sqlarg):
-            data = self._execute(sqlstmt, tuple(sqlarg))
-        else:
-            data = self._execute(sqlstmt)
-        for row in data:
-            if row['version']:
-                col = {}
-                col['version'] = row['version']
-                col['pkgarch'] = row['pkgarch']
-                col['checksum'] = row['checksum']
-                col['value'] = row['value']
-                datainfo.append(col)
+                if row["version"]:
+                    col = {}
+                    col["version"] = row["version"]
+                    col["pkgarch"] = row["pkgarch"]
+                    col["checksum"] = row["checksum"]
+                    col["value"] = row["value"]
+                    datainfo.append(col)
         return (metainfo, datainfo)
 
     def dump_db(self, fd):
@@ -240,41 +256,46 @@ class PRTable(object):
         for line in self.conn.iterdump():
             writeCount = writeCount + len(line) + 1
             fd.write(line)
-            fd.write('\n')
+            fd.write("\n")
         return writeCount
 
 class PRData(object):
     """Object representing the PR database"""
-    def __init__(self, filename, nohist=True):
+    def __init__(self, filename, read_only=False):
         self.filename=os.path.abspath(filename)
-        self.nohist=nohist
+        self.read_only = read_only
         #build directory hierarchy
         try:
             os.makedirs(os.path.dirname(self.filename))
         except OSError as e:
             if e.errno != errno.EEXIST:
                 raise e
-        self.connection=sqlite3.connect(self.filename, isolation_level="EXCLUSIVE", check_same_thread = False)
+        uri = "file:%s%s" % (self.filename, "?mode=ro" if self.read_only else "")
+        logger.debug("Opening PRServ database '%s'" % (uri))
+        self.connection=sqlite3.connect(uri, uri=True)
         self.connection.row_factory=sqlite3.Row
-        self.connection.execute("pragma synchronous = off;")
-        self.connection.execute("PRAGMA journal_mode = MEMORY;")
+        self.connection.execute("PRAGMA synchronous = OFF;")
+        self.connection.execute("PRAGMA journal_mode = WAL;")
+        self.connection.commit()
         self._tables={}
 
     def disconnect(self):
+        self.connection.commit()
         self.connection.close()
 
-    def __getitem__(self,tblname):
+    def __getitem__(self, tblname):
         if not isinstance(tblname, str):
             raise TypeError("tblname argument must be a string, not '%s'" %
                             type(tblname))
         if tblname in self._tables:
             return self._tables[tblname]
         else:
-            tableobj = self._tables[tblname] = PRTable(self.connection, tblname, self.nohist)
+            tableobj = self._tables[tblname] = PRTable(self.connection, tblname, self.read_only)
             return tableobj
 
     def __delitem__(self, tblname):
         if tblname in self._tables:
             del self._tables[tblname]
         logger.info("drop table %s" % (tblname))
-        self.connection.execute("DROP TABLE IF EXISTS %s;" % tblname) 
+        self.connection.execute("DROP TABLE IF EXISTS %s;" % tblname)
+        self.connection.commit()