some rearangements

1 files changed, 231 insertions, 0 deletions

diff --git a/pgsql.c b/pgsql.c
new file mode 100644
index 0000000..9b7e53b
--- /dev/null
+++ b/pgsql.c
@@ -0,0 +1,231 @@
+/*
+    Copyright (C) 2012 Andreas Baumann <abaumann@yahoo.com>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "pgsql.h"
+
+#include <string.h>		/* for strlen, memcpy, strcmp */
+
+#include <syslog.h>		/* for ERR_XXX */
+#include <errno.h>		/* for ENOENT and friends */
+#include <arpa/inet.h>		/* for htonl, ntohl */
+
+int psql_get_meta( PGconn *conn, const char *path, PgMeta *meta )
+{
+	PGresult *res;
+	int i_id;
+	int i_size;
+	int i_isdir;
+	char *iptr;
+	char *s;
+	int id;
+	
+	const char *values[1] = { path };
+	int lengths[1] = { strlen( path ) };
+	int binary[1] = { 1 };
+	
+	res = PQexecParams( conn, "SELECT id, size, isdir FROM dir WHERE path = $1::varchar",
+		1, NULL, values, lengths, binary, 1 );
+	
+	if( PQresultStatus( res ) != PGRES_TUPLES_OK ) {
+		syslog( LOG_ERR, "Error in psql_get_meta for path '%s'", path );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	if( PQntuples( res ) == 0 ) {
+		PQclear( res );
+		return -ENOENT;
+	}
+	
+	if( PQntuples( res ) > 1 ) {
+		syslog( LOG_ERR, "Expecting exactly one inode for path '%s' in psql_get_meta, data inconsistent!", path );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	i_id = PQfnumber( res, "id" );
+	i_size = PQfnumber( res, "size" );
+	i_isdir = PQfnumber( res, "isdir" );
+	iptr = PQgetvalue( res, 0, i_id );
+	id = ntohl( *( (uint32_t *)iptr ) );
+	iptr = PQgetvalue( res, 0, i_size );
+	meta->size = ntohl( *( (uint32_t *)iptr ) );
+	s = PQgetvalue( res, 0, i_isdir );
+	meta->isdir = 0;
+	if( s[0] == '\001' ) meta->isdir = 1;
+
+	PQclear( res );
+	
+	return id;
+}
+
+int psql_create_file( PGconn *conn, const int parent_id, const char *path, const char *new_file, mode_t mode )
+{
+	int param1 = htonl( parent_id );
+	const char *values[3] = { (char *)&param1, new_file, path };
+	int lengths[3] = { sizeof( parent_id), strlen( new_file ), strlen( path ) };
+	int binary[3] = { 1, 0, 0 };
+	PGresult *res;
+	
+	res = PQexecParams( conn, "INSERT INTO dir( parent_id, name, path, isdir ) VALUES ($1::int4, $2::varchar, $3::varchar, false )",
+		3, NULL, values, lengths, binary, 1 );
+
+	if( PQresultStatus( res ) != PGRES_COMMAND_OK ) {
+		syslog( LOG_ERR, "Error in psql_create_file for path '%s': %s",
+			path, PQerrorMessage( conn ) );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	PQclear( res );
+		
+	return 0;
+}
+
+int psql_read_buf( PGconn *conn, const int id, const char *path, char **buf, const size_t len )
+{
+	int param1 = htonl( id );
+	const char *values[1] = { (char *)&param1 };
+	int lengths[2] = { sizeof( param1 ) };
+	int binary[2] = { 1, 1 };
+	PGresult *res;
+	int i_data;
+	int read;
+	
+	res = PQexecParams( conn, "SELECT data FROM DATA WHERE id=$1::int4",
+		1, NULL, values, lengths, binary, 1 );
+	
+	if( PQresultStatus( res ) != PGRES_TUPLES_OK ) {
+		syslog( LOG_ERR, "Error in psql_read_buf for path '%s'", path );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	if( PQntuples( res ) != 1 ) {
+		syslog( LOG_ERR, "Expecting exactly one data entry for path '%s' in psql_read_buf, data inconsistent!", path );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	i_data = PQfnumber( res, "data" );
+	read = PQgetlength( res, 0, i_data );
+	memcpy( *buf, PQgetvalue( res, 0, i_data ), read );
+
+	PQclear( res );
+	
+	return read;
+}
+
+int psql_readdir( PGconn *conn, const int parent_id, void *buf, fuse_fill_dir_t filler )
+{
+	int param1 = htonl( parent_id );
+	const char *values[1] = { (char *)&param1 };
+	int lengths[1] = { sizeof( param1 ) };
+	int binary[1] = { 1 };
+	PGresult *res;
+	int i_name;
+	int i;
+	char *name;
+	
+	res = PQexecParams( conn, "SELECT name FROM dir WHERE parent_id = $1::int4",
+		1, NULL, values, lengths, binary, 1 );
+	
+	if( PQresultStatus( res ) != PGRES_TUPLES_OK ) {
+		syslog( LOG_ERR, "Error in psql_readdir for dir with id '%d': %s",
+			parent_id, PQerrorMessage( conn ) );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	i_name = PQfnumber( res, "name" );
+	for( i = 0; i < PQntuples( res ); i++ ) {
+		name = PQgetvalue( res, i, i_name );
+		if( strcmp( name, "/" ) == 0 ) continue;
+		filler( buf, name, NULL, 0 );
+        }
+        
+	PQclear( res );
+        	
+	return 0;
+}
+
+int psql_create_dir( PGconn *conn, const int parent_id, const char *path, const char *new_dir, mode_t mode )
+{
+	int param1 = htonl( parent_id );
+	const char *values[3] = { (char *)&param1, new_dir, path };
+	int lengths[3] = { sizeof( parent_id), strlen( new_dir ), strlen( path ) };
+	int binary[3] = { 1, 0, 0 };
+	PGresult *res;
+	
+	res = PQexecParams( conn, "INSERT INTO dir( parent_id, name, path, isdir ) VALUES ($1::int4, $2::varchar, $3::varchar, true )",
+		3, NULL, values, lengths, binary, 1 );
+
+	if( PQresultStatus( res ) != PGRES_COMMAND_OK ) {
+		syslog( LOG_ERR, "Error in psql_create_dir for path '%s': %s", path, PQerrorMessage( conn ) );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	PQclear( res );
+	
+	return 0;
+}
+
+int psql_write_buf( PGconn *conn, const int id, const char *path, const char *buf, const size_t len )
+{
+	int param1 = htonl( id );
+	const char *values[2] = { (char *)&param1, buf };
+	int lengths[2] = { sizeof( param1 ), len };
+	int binary[2] = { 1, 1 };
+	PGresult *res;
+	
+	res = PQexecParams( conn, "UPDATE data SET data=$2::bytea WHERE id=$1::int4",
+		2, NULL, values, lengths, binary, 1 );
+
+	if( PQresultStatus( res ) != PGRES_COMMAND_OK ) {
+		syslog( LOG_ERR, "Error in psql_write_buf for file '%s': %s", path, PQerrorMessage( conn ) );
+		PQclear( res );
+		return -EIO;
+	}
+	
+	PQclear( res );
+	
+	return len;
+}
+
+int psql_write_meta( PGconn *conn, const int id, const char *path, PgMeta meta )
+{
+	int param1 = htonl( id );
+	int param2 = htonl( meta.size );
+	const char *values[2] = { (char *)&param1, (char *)&param2 };
+	int lengths[2] = { sizeof( param1 ), sizeof( param2 ) };
+	int binary[2] = { 1, 1 };
+	PGresult *res;
+	
+	res = PQexecParams( conn, "UPDATE dir SET size=$2::int4 WHERE id=$1::int4",
+		2, NULL, values, lengths, binary, 1 );
+
+	if( PQresultStatus( res ) != PGRES_COMMAND_OK ) {
+		syslog( LOG_ERR, "Error in psql_write_meta for file '%s': %s", path, PQerrorMessage( conn ) );
+		PQclear( res );
+		return -EIO;
+	}
+
+	PQclear( res );
+	
+	return 0;
+}