diff options
Diffstat (limited to '')
| -rw-r--r-- | src/plugins/replication/Makefile.am | 25 | ||||
| -rw-r--r-- | src/plugins/replication/Makefile.in | 827 | ||||
| -rw-r--r-- | src/plugins/replication/replication-plugin.c | 404 | ||||
| -rw-r--r-- | src/plugins/replication/replication-plugin.h | 9 |
4 files changed, 1265 insertions, 0 deletions
diff --git a/src/plugins/replication/Makefile.am b/src/plugins/replication/Makefile.am new file mode 100644 index 0000000..461935c --- /dev/null +++ b/src/plugins/replication/Makefile.am @@ -0,0 +1,25 @@ +AM_CPPFLAGS = \ + -I$(top_srcdir)/src/lib \ + -I$(top_srcdir)/src/lib-mail \ + -I$(top_srcdir)/src/lib-imap \ + -I$(top_srcdir)/src/lib-index \ + -I$(top_srcdir)/src/lib-storage \ + -I$(top_srcdir)/src/replication \ + -I$(top_srcdir)/src/plugins/notify + +NOPLUGIN_LDFLAGS = +lib20_replication_plugin_la_LDFLAGS = -module -avoid-version + +module_LTLIBRARIES = \ + lib20_replication_plugin.la + +if DOVECOT_PLUGIN_DEPS +lib20_replication_plugin_la_LIBADD = \ + ../notify/lib15_notify_plugin.la +endif + +lib20_replication_plugin_la_SOURCES = \ + replication-plugin.c + +noinst_HEADERS = \ + replication-plugin.h diff --git a/src/plugins/replication/Makefile.in b/src/plugins/replication/Makefile.in new file mode 100644 index 0000000..34a0ce3 --- /dev/null +++ b/src/plugins/replication/Makefile.in @@ -0,0 +1,827 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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100644 index 0000000..9b4bb08 --- /dev/null +++ b/src/plugins/replication/replication-plugin.c @@ -0,0 +1,404 @@ +/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */ + +#include "lib.h" +#include "array.h" +#include "str.h" +#include "strescape.h" +#include "ioloop.h" +#include "net.h" +#include "write-full.h" +#include "mail-user.h" +#include "mail-namespace.h" +#include "mail-storage-private.h" +#include "notify-plugin.h" +#include "replication-common.h" +#include "replication-plugin.h" + + +#define REPLICATION_SOCKET_NAME "replication-notify" +#define REPLICATION_FIFO_NAME "replication-notify-fifo" +#define REPLICATION_NOTIFY_DELAY_MSECS 500 +#define REPLICATION_SYNC_TIMEOUT_SECS 10 + +#define REPLICATION_USER_CONTEXT(obj) \ + MODULE_CONTEXT(obj, replication_user_module) + +struct replication_user { + union mail_user_module_context module_ctx; + + const char *socket_path; + + struct timeout *to; + enum replication_priority priority; + unsigned int sync_secs; +}; + +struct replication_mail_txn_context { + struct mail_namespace *ns; + bool new_messages; + bool sync_trans; + char *reason; +}; + +static MODULE_CONTEXT_DEFINE_INIT(replication_user_module, + &mail_user_module_register); +static int fifo_fd; +static bool fifo_failed; +static char *fifo_path; + +static int +replication_fifo_notify(struct mail_user *user, + enum replication_priority priority) +{ + string_t *str; + ssize_t ret; + + if (fifo_failed) + return -1; + if (fifo_fd == -1) { + fifo_fd = open(fifo_path, O_WRONLY | O_NONBLOCK); + if (fifo_fd == -1) { + i_error("open(%s) failed: %m", fifo_path); + fifo_failed = TRUE; + return -1; + } + } + /* <username> \t <priority> */ + str = t_str_new(256); + str_append_tabescaped(str, user->username); + str_append_c(str, '\t'); + switch (priority) { + case REPLICATION_PRIORITY_NONE: + case REPLICATION_PRIORITY_SYNC: + i_unreached(); + case REPLICATION_PRIORITY_LOW: + str_append(str, "low"); + break; + case REPLICATION_PRIORITY_HIGH: + str_append(str, "high"); + break; + } + str_append_c(str, '\n'); + ret = write(fifo_fd, str_data(str), str_len(str)); + i_assert(ret != 0); + if (ret != (ssize_t)str_len(str)) { + if (ret > 0) + i_error("write(%s) wrote partial data", fifo_path); + else if (errno == EAGAIN) { + /* busy, try again later */ + return 0; + } else if (errno != EPIPE) { + i_error("write(%s) failed: %m", fifo_path); + } else { + /* server was probably restarted, don't bother logging + this. */ + } + if (close(fifo_fd) < 0) + i_error("close(%s) failed: %m", fifo_path); + fifo_fd = -1; + return -1; + } + return 1; +} + +static void replication_notify_now(struct mail_user *user) +{ + struct replication_user *ruser = REPLICATION_USER_CONTEXT(user); + int ret; + + i_assert(ruser != NULL); + i_assert(ruser->priority != REPLICATION_PRIORITY_NONE); + i_assert(ruser->priority != REPLICATION_PRIORITY_SYNC); + + if ((ret = replication_fifo_notify(user, ruser->priority)) < 0 && + !fifo_failed) { + /* retry once, in case replication server was restarted */ + ret = replication_fifo_notify(user, ruser->priority); + } + if (ret != 0) { + timeout_remove(&ruser->to); + ruser->priority = REPLICATION_PRIORITY_NONE; + } +} + +static int replication_notify_sync(struct mail_user *user) +{ + struct replication_user *ruser = REPLICATION_USER_CONTEXT(user); + string_t *str; + char buf[1024]; + int fd; + ssize_t ret; + bool success = FALSE; + + i_assert(ruser != NULL); + + fd = net_connect_unix(ruser->socket_path); + if (fd == -1) { + i_error("net_connect_unix(%s) failed: %m", ruser->socket_path); + return -1; + } + net_set_nonblock(fd, FALSE); + + /* <username> \t "sync" */ + str = t_str_new(256); + str_append_tabescaped(str, user->username); + str_append(str, "\tsync\n"); + alarm(ruser->sync_secs); + if (write_full(fd, str_data(str), str_len(str)) < 0) { + i_error("write(%s) failed: %m", ruser->socket_path); + } else { + /* + | - */ + ret = read(fd, buf, sizeof(buf)); + if (ret < 0) { + if (errno != EINTR) { + i_error("read(%s) failed: %m", + ruser->socket_path); + } else { + i_warning("replication(%s): Sync failure: " + "Timeout in %u secs", + user->username, ruser->sync_secs); + } + } else if (ret == 0) { + i_error("read(%s) failed: EOF", ruser->socket_path); + } else if (buf[0] == '+') { + /* success */ + success = TRUE; + } else if (buf[0] == '-') { + /* failure */ + if (buf[ret-1] == '\n') ret--; + i_warning("replication(%s): Sync failure: %s", + user->username, t_strndup(buf+1, ret-1)); + i_warning("replication(%s): " + "Remote sent invalid input: %s", + user->username, t_strndup(buf, ret)); + } + } + alarm(0); + if (close(fd) < 0) + i_error("close(%s) failed: %m", ruser->socket_path); + return success ? 0 : -1; +} + +static void replication_notify(struct mail_namespace *ns, + enum replication_priority priority, + const char *event) +{ + struct replication_user *ruser; + + ruser = REPLICATION_USER_CONTEXT(ns->user); + if (ruser == NULL) + return; + + e_debug(ns->user->event, + "replication: Replication requested by '%s', priority=%d", + event, priority); + + if (priority == REPLICATION_PRIORITY_SYNC) { + if (replication_notify_sync(ns->user) == 0) { + timeout_remove(&ruser->to); + ruser->priority = REPLICATION_PRIORITY_NONE; + return; + } + /* sync replication failed, try as "high" via fifo */ + priority = REPLICATION_PRIORITY_HIGH; + } + + if (ruser->priority < priority) + ruser->priority = priority; + if (ruser->to == NULL) { + ruser->to = timeout_add_short(REPLICATION_NOTIFY_DELAY_MSECS, + replication_notify_now, ns->user); + } +} + +static void * +replication_mail_transaction_begin(struct mailbox_transaction_context *t) +{ + struct replication_mail_txn_context *ctx; + + ctx = i_new(struct replication_mail_txn_context, 1); + ctx->ns = mailbox_get_namespace(t->box); + ctx->reason = i_strdup(t->reason); + if ((t->flags & MAILBOX_TRANSACTION_FLAG_SYNC) != 0) { + /* Transaction is from dsync. Don't trigger replication back. */ + ctx->sync_trans = TRUE; + } + return ctx; +} + +static void replication_mail_save(void *txn, struct mail *mail ATTR_UNUSED) +{ + struct replication_mail_txn_context *ctx = + (struct replication_mail_txn_context *)txn; + + ctx->new_messages = TRUE; +} + +static void replication_mail_copy(void *txn, struct mail *src, + struct mail *dst) +{ + struct replication_mail_txn_context *ctx = + (struct replication_mail_txn_context *)txn; + + if (src->box->storage != dst->box->storage) { + /* copy between storages, e.g. new mail delivery */ + ctx->new_messages = TRUE; + } else { + /* copy within storage, which isn't as high priority since the + mail already exists. and especially copies to Trash or to + lazy-expunge namespace is pretty low priority. */ + } +} + +static bool +replication_want_sync_changes(const struct mail_transaction_commit_changes *changes) +{ + /* Replication needs to be triggered on all the user-visible changes, + but not e.g. due to writes to cache file. */ + return (changes->changes_mask & + ENUM_NEGATE(MAIL_INDEX_TRANSACTION_CHANGE_OTHERS)) != 0; +} + +static void +replication_mail_transaction_commit(void *txn, + struct mail_transaction_commit_changes *changes) +{ + struct replication_mail_txn_context *ctx = + (struct replication_mail_txn_context *)txn; + struct replication_user *ruser = + REPLICATION_USER_CONTEXT(ctx->ns->user); + enum replication_priority priority; + + if (ruser != NULL && !ctx->sync_trans && + (ctx->new_messages || replication_want_sync_changes(changes))) { + priority = !ctx->new_messages ? REPLICATION_PRIORITY_LOW : + ruser->sync_secs == 0 ? REPLICATION_PRIORITY_HIGH : + REPLICATION_PRIORITY_SYNC; + replication_notify(ctx->ns, priority, ctx->reason); + } + i_free(ctx->reason); + i_free(ctx); +} + +static void replication_mailbox_create(struct mailbox *box) +{ + replication_notify(mailbox_get_namespace(box), + REPLICATION_PRIORITY_LOW, "mailbox create"); +} + +static void +replication_mailbox_delete_commit(void *txn ATTR_UNUSED, + struct mailbox *box) +{ + replication_notify(mailbox_get_namespace(box), + REPLICATION_PRIORITY_LOW, "mailbox delete"); +} + +static void +replication_mailbox_rename(struct mailbox *src ATTR_UNUSED, + struct mailbox *dest) +{ + replication_notify(mailbox_get_namespace(dest), + REPLICATION_PRIORITY_LOW, "mailbox rename"); +} + +static void replication_mailbox_set_subscribed(struct mailbox *box, + bool subscribed ATTR_UNUSED) +{ + replication_notify(mailbox_get_namespace(box), + REPLICATION_PRIORITY_LOW, "mailbox subscribe"); +} + +static void replication_user_deinit(struct mail_user *user) +{ + struct replication_user *ruser = REPLICATION_USER_CONTEXT(user); + + i_assert(ruser != NULL); + + if (ruser->to != NULL) { + replication_notify_now(user); + if (ruser->to != NULL) { + i_warning("%s: Couldn't send final notification " + "due to fifo being busy", fifo_path); + timeout_remove(&ruser->to); + } + } + + ruser->module_ctx.super.deinit(user); +} + +static void replication_user_created(struct mail_user *user) +{ + struct mail_user_vfuncs *v = user->vlast; + struct replication_user *ruser; + const char *value; + + value = mail_user_plugin_getenv(user, "mail_replica"); + if (value == NULL || value[0] == '\0') { + e_debug(user->event, "replication: No mail_replica setting - replication disabled"); + return; + } + + if (user->dsyncing) { + /* we're running dsync, which means that the remote is telling + us about a change. don't trigger a replication back to it */ + e_debug(user->event, "replication: We're running dsync - replication disabled"); + return; + } + + ruser = p_new(user->pool, struct replication_user, 1); + ruser->module_ctx.super = *v; + user->vlast = &ruser->module_ctx.super; + v->deinit = replication_user_deinit; + MODULE_CONTEXT_SET(user, replication_user_module, ruser); + + if (fifo_path == NULL) { + /* we'll assume that all users have the same base_dir. + they really should. */ + fifo_path = i_strconcat(user->set->base_dir, + "/"REPLICATION_FIFO_NAME, NULL); + } + ruser->socket_path = p_strconcat(user->pool, user->set->base_dir, + "/"REPLICATION_SOCKET_NAME, NULL); + value = mail_user_plugin_getenv(user, "replication_sync_timeout"); + if (value != NULL && str_to_uint(value, &ruser->sync_secs) < 0) { + i_error("replication(%s): " + "Invalid replication_sync_timeout value: %s", + user->username, value); + } +} + +static const struct notify_vfuncs replication_vfuncs = { + .mail_transaction_begin = replication_mail_transaction_begin, + .mail_save = replication_mail_save, + .mail_copy = replication_mail_copy, + .mail_transaction_commit = replication_mail_transaction_commit, + .mailbox_create = replication_mailbox_create, + .mailbox_delete_commit = replication_mailbox_delete_commit, + .mailbox_rename = replication_mailbox_rename, + .mailbox_set_subscribed = replication_mailbox_set_subscribed +}; + +static struct notify_context *replication_ctx; + +static struct mail_storage_hooks replication_mail_storage_hooks = { + .mail_user_created = replication_user_created +}; + +void replication_plugin_init(struct module *module) +{ + fifo_fd = -1; + replication_ctx = notify_register(&replication_vfuncs); + mail_storage_hooks_add(module, &replication_mail_storage_hooks); +} + +void replication_plugin_deinit(void) +{ + i_close_fd_path(&fifo_fd, fifo_path); + i_free_and_null(fifo_path); + + mail_storage_hooks_remove(&replication_mail_storage_hooks); + notify_unregister(replication_ctx); +} + +const char *replication_plugin_dependencies[] = { "notify", NULL }; diff --git a/src/plugins/replication/replication-plugin.h b/src/plugins/replication/replication-plugin.h new file mode 100644 index 0000000..7fa344f --- /dev/null +++ b/src/plugins/replication/replication-plugin.h @@ -0,0 +1,9 @@ +#ifndef REPLICATION_PLUGIN_H +#define REPLICATION_PLUGIN_H + +extern const char *replication_plugin_dependencies[]; + +void replication_plugin_init(struct module *module); +void replication_plugin_deinit(void); + +#endif |