Mercurial > dovecot > core-2.2
view src/stats/fifo-input-connection.c @ 22715:20415dd0b85a
dsync: Add per-mailbox sync lock that is always used.
Both importing and exporting gets the lock before they even sync the
mailbox. The lock is kept until the import/export finishes. This guarantees
that no matter how dsync is run, two dsyncs can't be working on the same
mailbox at the same time.
This lock is in addition to the optional per-user lock enabled by the -l
parameter. If the -l parameter is used, the same lock timeout is used for
the per-mailbox lock. Otherwise 30s timeout is used.
This should help to avoid email duplication when replication is enabled for
public namespaces, and maybe in some other rare situations as well.
author | Timo Sirainen <timo.sirainen@dovecot.fi> |
---|---|
date | Thu, 28 Dec 2017 14:10:23 +0200 |
parents | cb108f786fb4 |
children |
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/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */ #include "lib.h" #include "llist.h" #include "strescape.h" #include "istream.h" #include "ostream.h" #include "master-service.h" #include "mail-session.h" #include "mail-user.h" #include "mail-command.h" #include "fifo-input-connection.h" #include <unistd.h> #define MAX_INBUF_SIZE (PIPE_BUF*2) struct fifo_input_connection { struct fifo_input_connection *prev, *next; int fd; struct istream *input; struct io *io; }; static struct fifo_input_connection *fifo_conns = NULL; static int fifo_input_connection_request(const char *const *args, const char **error_r) { const char *cmd = args[0]; if (cmd == NULL) { *error_r = "Missing command"; return -1; } args++; if (strcmp(cmd, "CONNECT") == 0) return mail_session_connect_parse(args, error_r); if (strcmp(cmd, "DISCONNECT") == 0) return mail_session_disconnect_parse(args, error_r); if (strcmp(cmd, "UPDATE-SESSION") == 0) return mail_session_update_parse(args, error_r); if (strcmp(cmd, "ADD-USER") == 0) return mail_user_add_parse(args, error_r); if (strcmp(cmd, "UPDATE-CMD") == 0) return mail_command_update_parse(args, error_r); *error_r = "Unknown command"; return -1; } static void fifo_input_connection_input(struct fifo_input_connection *conn) { const char *line, *const *args, *error; switch (i_stream_read(conn->input)) { case -2: i_error("BUG: Mail server sent too much data"); fifo_input_connection_destroy(&conn); return; case -1: fifo_input_connection_destroy(&conn); return; } while ((line = i_stream_next_line(conn->input)) != NULL) T_BEGIN { args = t_strsplit_tabescaped(line); if (fifo_input_connection_request(args, &error) < 0) i_error("FIFO input error: %s", error); } T_END; } struct fifo_input_connection *fifo_input_connection_create(int fd) { struct fifo_input_connection *conn; conn = i_new(struct fifo_input_connection, 1); conn->fd = fd; conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE, FALSE); conn->io = io_add(fd, IO_READ, fifo_input_connection_input, conn); DLLIST_PREPEND(&fifo_conns, conn); return conn; } void fifo_input_connection_destroy(struct fifo_input_connection **_conn) { struct fifo_input_connection *conn = *_conn; *_conn = NULL; DLLIST_REMOVE(&fifo_conns, conn); io_remove(&conn->io); i_stream_destroy(&conn->input); if (close(conn->fd) < 0) i_error("close(conn) failed: %m"); i_free(conn); } void fifo_input_connections_destroy_all(void) { while (fifo_conns != NULL) { struct fifo_input_connection *conn = fifo_conns; fifo_input_connection_destroy(&conn); } }