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Implement server part of libmanda

master
Stefan Bühler 9 years ago
parent
commit
3ab3fc6e62
3 changed files with 451 additions and 62 deletions
  1. +8
    -0
      libmanda-protocol.h
  2. +422
    -45
      libmanda.c
  3. +21
    -17
      libmanda.h

+ 8
- 0
libmanda-protocol.h View File

@@ -97,4 +97,12 @@
*
*/

typedef enum {
MANDA_CMD_BIND_BACKEND = 0x0001,
MANDA_CMD_RELEASE_BACKEND = 0x0002,
MANDA_CMD_UPDATE_BACKEND = 0x0003,

MANDA_CMD_UNKNOWN_COMMAND = 0xffff
} manda_commands;

#endif

+ 422
- 45
libmanda.c View File

@@ -1,5 +1,6 @@

#include "libmanda.h"
#include "libmanda-protocol.h"
#include "idlist.h"

#include <arpa/inet.h>
@@ -16,6 +17,11 @@
#define ENTER(x) do { ++((x)->refcount); } while(0)
#define LEAVE(x, destroy) do { if (0 == --((x)->refcount)) destroy(x); } while(0)

#define UNUSED(x) ((void)(x))

#define CONST_STR_LEN(x) (x), (sizeof(x) - 1)
#define GSTR_LEN(x) ((x) ? (x)->str : ""), ((x) ? (x)->len : 0)

#if __GNUC__
# define INLINE static inline
#else
@@ -24,7 +30,6 @@

typedef struct messageheader messageheader;
typedef struct request request;
typedef struct manda_connection manda_connection;

typedef void (*con_message_cb)(manda_connection *con, guint16 orig_command, gpointer orig_data, guint16 mesg_command, guint16 mesg_req_id, GByteArray *mesg_payload);
typedef void (*con_close_cb)(manda_connection *con);
@@ -51,6 +56,7 @@ struct manda_connection {
con_close_cb close_cb;

int fd;
gboolean closed;

manda_fd_watcher fd_watcher;
manda_timeout req_timeout;
@@ -71,6 +77,28 @@ struct manda_connection {
gint refcount;
};

static void fd_no_block(int fd) {
#ifdef O_NONBLOCK
fcntl(fd, F_SETFL, O_NONBLOCK | O_RDWR);
#elif defined _WIN32
int i = 1;
ioctlsocket(fd, FIONBIO, &i);
#else
#error No way found to set non-blocking mode for fds.
#endif
}

static void fd_init(int fd) {
#ifdef FD_CLOEXEC
/* close fd on exec (cgi) */
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
fd_no_block(fd);
}

/* -------------------------- */
/* Message building / parsing */
/* -------------------------- */

INLINE guint8 _read_net_uint8(const guint8* buf) {
return *buf;
@@ -133,6 +161,7 @@ INLINE gboolean read_net_uint32(GByteArray *buf, guint *pos, guint32 *dest) {
}
INLINE gboolean read_net_string(GByteArray *buf, guint *pos, GString *dest) {
guint16 slen;

g_string_truncate(dest, 0);
if (!read_net_uint16(buf, pos, &slen)) return FALSE;
if (buf->len < slen || *pos >= buf->len - slen) {
@@ -160,14 +189,19 @@ INLINE void write_net_uint32(GByteArray *buf, guint32 val) {
g_byte_array_set_size(buf, curlen + sizeof(val));
_write_net_uint32(buf->data + curlen, val);
}
INLINE void write_net_string(GByteArray *buf, GString *val) {
INLINE void write_net_string(GByteArray *buf, const gchar *str, guint len) {
guint curlen = buf->len;
g_byte_array_set_size(buf, curlen + sizeof(guint16) + val->len);
_write_net_uint16(buf->data + curlen, val->len);
memcpy(buf->data + curlen + sizeof(guint16), val->str, val->len);
g_byte_array_set_size(buf, curlen + sizeof(guint16) + len);
_write_net_uint16(buf->data + curlen, len);
memcpy(buf->data + curlen + sizeof(guint16), str, len);
}


/* ---------------- */
/* Basic Connection */
/* ---------------- */

static void _con_free(manda_connection *con);

static void con_req_unlink(manda_connection *con, request *req) {
request *prev = NULL, *next = NULL;
@@ -205,6 +239,12 @@ static void con_req_push(manda_connection *con, request *req, guint16 reqid) {
static void con_close(manda_connection *con) {
GByteArray *buf;

if (con->closed) return;

con->closed = TRUE;

ENTER(con);

if (NULL != con->fd_watcher.priv) {
con->ctrl->destroy_fd_watcher(con->data, &con->fd_watcher);
con->fd_watcher.priv = NULL;
@@ -264,9 +304,13 @@ static void con_close(manda_connection *con) {
g_byte_array_free(con->cur_payload, TRUE);
con->cur_payload = NULL;
}

LEAVE(con, _con_free);
}

static void _con_free(manda_connection *con) {
ENTER(con); /* don't want to enter _con_free again */

con_close(con);

g_slice_free(manda_connection, con);
@@ -336,7 +380,7 @@ static void con_fd_watcher_cb(manda_fd_watcher *watcher) {
ENTER(con);

/* handle read */
for ( i = 0 ; (con->fd != -1) && (i < 100) ; i++ ) {
for ( i = 0 ; (!con->closed) && (i < 100) ; i++ ) {
if (con->cur_header_pos < 8) {
ssize_t r = read(con->fd, &con->cur_header_buf[con->cur_header_pos], 8 - con->cur_header_pos);

@@ -419,7 +463,7 @@ static void con_fd_watcher_cb(manda_fd_watcher *watcher) {
}
}

for ( i = 0 ; (con->fd != -1) && (i < 100) && (con->send_queue.length > 0) ; i++ ) {
for ( i = 0 ; (!con->closed) && (i < 100) && (con->send_queue.length > 0) ; i++ ) {
GByteArray *buf = g_queue_peek_head(&con->send_queue);
ssize_t written;

@@ -531,7 +575,7 @@ static manda_connection* con_new(gpointer srv, const manda_async_ctrl *ctrl, gpo
con->req_timeout.callback = con_timeout_cb;
con->req_timeout.timeout = 0;

con->request_ids = manda_idlist_new(65535);
con->request_ids = manda_idlist_new(65536);
/* id 0 is reserved so request it here */
first_id = manda_idlist_get(con->request_ids);
assert(0 == first_id);
@@ -560,7 +604,7 @@ static void con_send_request(manda_connection *con, GByteArray *payload, guint16

ENTER(con);

if (-1 == con->fd) {
if (con->closed) {
/* connection closed */
goto error;
}
@@ -611,10 +655,12 @@ out:
}

/* payload needs to be prefixed with 8 dummy bytes for the header */
static void con_send_notify(manda_connection *con, GByteArray *payload, guint16 command, guint16 resp_id) {
static gboolean con_send_notify(manda_connection *con, GByteArray *payload, guint16 command, guint16 resp_id) {
gboolean res = TRUE;

ENTER(con);

if (-1 == con->fd) {
if (con->closed) {
/* connection closed */
goto error;
}
@@ -633,21 +679,176 @@ static void con_send_notify(manda_connection *con, GByteArray *payload, guint16

error:
g_byte_array_free(payload, TRUE);
res = FALSE;

out:
LEAVE(con, _con_free);

return res;
}

/* message construction helper */

static GByteArray* new_payload() {
GByteArray* buf = g_byte_array_new();
g_byte_array_set_size(buf, 8);
return buf;
}

static gboolean send_unkown_command(manda_connection *con, guint16 cmd, guint16 resp_id) {
GByteArray *payload;
if (NULL == con) return FALSE;

payload = new_payload();
write_net_uint16(payload, cmd);
return con_send_notify(con, payload, MANDA_CMD_UNKNOWN_COMMAND, resp_id);
}

static gboolean send_server_bind_backend(manda_connection *con, guint16 resp_id, guint32 backend_id, const gchar *str, guint len) {
GByteArray *payload;
if (NULL == con) return FALSE;

payload = new_payload();
write_net_uint32(payload, backend_id);
write_net_string(payload, str, len);
return con_send_notify(con, payload, MANDA_CMD_BIND_BACKEND, resp_id);
}

static gboolean send_server_bind_backend_failed(manda_connection *con, guint16 resp_id, const gchar *str, guint len) {
return send_server_bind_backend(con, resp_id, 0, str, len);
}

static gboolean send_server_release_backend(manda_connection *con, guint32 backend_id, const gchar *str, guint len) {
GByteArray *payload;
if (NULL == con) return FALSE;

payload = new_payload();
write_net_uint32(payload, backend_id);
write_net_string(payload, str, len);
return con_send_notify(con, payload, MANDA_CMD_RELEASE_BACKEND, 0);
}

/* server connection */

typedef struct server_socket server_socket;
struct server_socket {
manda_server *srv;

int fd;
gpointer data;

manda_fd_watcher fd_watcher;
};

static void manda_server_connection_free(manda_server_connection *con);
static void manda_server_backend_release(manda_server_connection *con, guint32 id);
static void scon_con_closed_cb(manda_connection *con);
static void scon_con_message_cb(manda_connection *con, guint16 orig_command, gpointer orig_data, guint16 mesg_command, guint16 mesg_req_id, GByteArray *mesg_payload);
static void scon_release(manda_server_connection *con);

static void sbackend_free(manda_server_backend *backend);

static void manda_server_release_backend(manda_server_connection *con, guint32 id);

static void server_listening_cb(manda_fd_watcher *fd_watcher) {
server_socket *sock = fd_watcher->priv;
manda_server *s = sock->srv;
int fd;
int i;
manda_server_connection *con;

fd = accept(sock->fd, NULL, NULL);

if (-1 == fd) return;

fd_init(fd);

con = g_slice_new0(manda_server_connection);
con->srv = s;
con->refcount = 1;
con->backends = g_ptr_array_new();
con->idlist = manda_idlist_new(65536);
i = manda_idlist_get(con->idlist); /* 0 is an invalid backend id, reserve it */
assert(i == 0);
con->con = con_new(s->data, s->ctrl, con, scon_con_message_cb, scon_con_closed_cb, fd);
}

static void scon_free(manda_server_connection *con) {
ENTER(con); /* don't want to enter scon_free again */

manda_server_con_close(con);

g_slice_free(manda_server_connection, con);
}
static void scon_release(manda_server_connection *con) {
LEAVE(con, scon_free);
}

void manda_server_con_close(manda_server_connection *con) {
guint i;
manda_connection *bcon = con->con;

if (NULL == bcon) return;

ENTER(con);

g_ptr_array_remove_fast(con->srv->connections, con);
scon_release(con);

con->con = NULL;
bcon->close_cb = NULL;
con_close(bcon);
con_free(bcon);

if (NULL != con->srv->callbacks->closed_connection) {
con->srv->callbacks->closed_connection(con->srv->data, con);
}

for (i = 0; i < con->backends->len; i++) {
manda_server_backend_use *use = g_ptr_array_index(con->backends, i);
if (NULL == use) continue;
manda_server_release_backend(con, i);
}

g_ptr_array_free(con->backends, TRUE);
con->backends = NULL;
manda_idlist_free(con->idlist);
con->idlist = NULL;

LEAVE(con, scon_free);
}

static void scon_con_closed_cb(manda_connection *con) {
manda_server_connection *scon = con->priv_data;

manda_server_con_close(scon);
}

void manda_server_add_socket(manda_server *s, int fd, gpointer data) {
server_socket *sock = g_slice_new0(server_socket);

sock->srv = s;
sock->fd = fd;
sock->data = data;
sock->fd_watcher.callback = server_listening_cb;
sock->fd_watcher.events = MANDA_FD_READ;
sock->fd_watcher.fd = fd;
sock->fd_watcher.priv = sock;

s->ctrl->new_fd_watcher(s->data, &sock->fd_watcher);
s->ctrl->update_fd_watcher(s->data, &sock->fd_watcher);

g_ptr_array_add(s->sockets, sock);
}

static void manda_server_free_socket(server_socket *sock) {
manda_server *s = sock->srv;

s->ctrl->destroy_fd_watcher(s->data, &sock->fd_watcher);

while (-1 == close(sock->fd) && errno == EINTR) ;
sock->fd = -1;

g_slice_free(server_socket, sock);
}

manda_server* manda_server_new(gpointer srv, const manda_async_ctrl *ctrl, const manda_server_callbacks *callbacks) {
manda_server *s = g_slice_new(manda_server);
@@ -656,62 +857,61 @@ manda_server* manda_server_new(gpointer srv, const manda_async_ctrl *ctrl, const
s->connections = g_ptr_array_new();
s->ctrl = ctrl;
s->callbacks = callbacks;
s->sockets = g_array_new(FALSE, TRUE, sizeof(server_socket));
s->sockets = g_ptr_array_new();

return s;
}

void manda_server_acquire(manda_server *s) {
++s->refcount;
}

void manda_server_close(manda_server *s) {
guint i;

for (i = 0; i < s->sockets->len; i++) {
server_socket *sock = &g_array_index(s->sockets, server_socket, i);
close(sock->fd);
server_socket *sock = g_ptr_array_index(s->sockets, i);
manda_server_free_socket(sock);
}
g_array_set_size(s->sockets, 0);
g_ptr_array_set_size(s->sockets, 0);

for (i = s->connections->len; i-- > 0; ) {
manda_server_connection *con = g_ptr_array_index(s->connections, i);
con->delete_later = TRUE;
s->callbacks->closed_connection(s->data, con);
if (con->refcount == 0) manda_server_connection_free(con);
while (s->connections->len > 0) {
manda_server_connection *con = g_ptr_array_index(s->connections, 0);
manda_server_con_close(con);
}
g_ptr_array_set_size(s->connections, 0);
}

void manda_server_release(manda_server *s) {
if (NULL == s) return;
if (0 < --s->refcount) return;

static void manda_server_free(manda_server *s) {
manda_server_close(s);

g_array_free(s->sockets, TRUE);
g_ptr_array_free(s->sockets, TRUE);
g_ptr_array_free(s->connections, TRUE);

g_slice_free(manda_server, s);
}

void manda_server_add_socket(manda_server *s, int fd, gpointer data);

static void manda_server_connection_free(manda_server_connection *con) {
/* TODO */
g_slice_free(manda_server_connection, con);
void manda_server_acquire(manda_server *s) {
ENTER(s);
}

void manda_server_con_close(manda_server_connection *con);
void manda_server_release(manda_server *s) {
if (NULL == s) return;

LEAVE(s, manda_server_free);
}

static void manda_server_backend_release(manda_server_connection *con, guint32 id) {
static void manda_server_release_backend(manda_server_connection *con, guint32 id) {
manda_server_backend_use *use;
manda_server_backend *b;

if (NULL == con->backends) return;

if (id >= con->backends->len) return;

if (manda_idlist_is_used(con->idlist, id)) {
/* notify client */
send_server_release_backend(con->con, id, CONST_STR_LEN("lost backend"));
}

use = g_ptr_array_index(con->backends, id);
if (NULL == use) return;
g_ptr_array_index(con->backends, id) = NULL;

b = use->backend;
if (use->ndx != b->usage->len - 1) {
@@ -722,14 +922,191 @@ static void manda_server_backend_release(manda_server_connection *con, guint32 i
b->sum_last_load -= use->last_load;
g_ptr_array_set_size(b->usage, b->usage->len-1);

con->refcount++;
LEAVE(b, sbackend_free);

con->srv->callbacks->release_backend(con->srv->data, b, use->ndx, use);
if (NULL != con->srv && NULL != con->srv->callbacks->release_backend) {
con->srv->callbacks->release_backend(con->srv->data, b, use->ndx, use);
}
g_slice_free(manda_server_backend_use, use);
}

manda_server_backend *manda_server_backend_new(gpointer data, GString *addr);
void manda_server_backend_free(manda_server_backend *backend);
manda_server_backend* manda_server_backend_new(gpointer data, GString *addr) {
manda_server_backend *backend = g_slice_new0(manda_server_backend);

backend->data = data;
backend->usage = g_ptr_array_new();
backend->sum_last_load = 0;
backend->addr = addr;
backend->refcount = 1;

return backend;
}

static void sbackend_free(manda_server_backend *backend) {
ENTER(backend); /* don't want to enter sbackend_free again */

manda_server_drop_backend(backend);

g_ptr_array_free(backend->usage, TRUE);
backend->usage = NULL;
g_string_free(backend->addr, TRUE);
backend->addr = NULL;

g_slice_free(manda_server_backend, backend);
}

void manda_server_backend_release(manda_server_backend *backend) {
if (NULL == backend) return;

LEAVE(backend, sbackend_free);
}
void manda_server_backend_acquire(manda_server_backend *backend) {
ENTER(backend);
}

gboolean manda_server_return_backend(manda_server_connection *con, gint16 reqid, manda_server_backend *backend) {
manda_server_backend_use *use;
gint i;

if (NULL == con->con || con->con->closed) return FALSE;

i = manda_idlist_get(con->idlist);
if (-1 == i) {
send_server_bind_backend_failed(con->con, reqid, CONST_STR_LEN("no free backend id available"));
return FALSE;
}
assert(i > 0);

use = g_slice_new0(manda_server_backend_use);
use->con = con;
use->backend_id = i;
use->last_load = use->last_workers = 0;
use->backend = backend;
use->ndx = backend->usage->len;
g_ptr_array_add(backend->usage, use);
if (use->backend_id >= con->backends->len) g_ptr_array_set_size(con->backends, use->backend_id + 1);
g_ptr_array_index(con->backends, use->backend_id) = use;

ENTER(backend);

return send_server_bind_backend(con->con, reqid, use->backend_id, GSTR_LEN(backend->addr));
}

void manda_server_return_backend_fail(manda_server_connection *con, gint16 reqid, GString *errmsg) {
send_server_bind_backend_failed(con->con, reqid, GSTR_LEN(errmsg));
}

void manda_server_drop_backend(manda_server_backend *backend) {
ENTER(backend);

while (backend->usage->len > 0) {
manda_server_backend_use *u = g_ptr_array_index(backend->usage, 0);
manda_server_release_backend(u->con, u->backend_id);
}

LEAVE(backend, sbackend_free);
}

static void sbackend_update(manda_server_connection *con, guint32 backend_id, guint32 load, guint32 workers) {
manda_server_backend_use *use;
manda_server_backend *b;

if (NULL == con->backends) return;

void manda_server_return_backend(manda_server_connection *con, gint16 reqid, manda_server_backend *backend);
void manda_server_drop_backend(manda_server_backend *backend);
if (backend_id >= con->backends->len) return;

use = g_ptr_array_index(con->backends, backend_id);
if (NULL == use) return;

b = use->backend;

b->sum_last_load += load - use->last_load;
use->last_load = load;
use->last_workers = workers;

if (NULL != con->srv->callbacks->update_backend) {
con->srv->callbacks->update_backend(con->srv->data, b, use->ndx);
}
}


static void scon_con_message_cb(manda_connection *con, guint16 orig_command, gpointer orig_data, guint16 mesg_command, guint16 mesg_req_id, GByteArray *payload) {
manda_server_connection *scon = con->priv_data;
manda_server *srv;
guint pos = 0;

UNUSED(orig_command); UNUSED(orig_data);

if (con->closed || NULL == scon || NULL == scon->srv) return;

srv = scon->srv;

ENTER(con);
ENTER(scon);
ENTER(srv);

switch (mesg_command) {
case MANDA_CMD_BIND_BACKEND: {
GString *name = NULL;

if (NULL == payload) goto error;
name = g_string_sized_new(payload->len - 2);
if (!read_net_string(payload, &pos, name)) { g_string_free(name, TRUE); goto error; }
if (pos != payload->len) { g_string_free(name, TRUE); goto error; }

srv->callbacks->bind_backend(srv->data, scon, name, mesg_req_id);

g_string_free(name, TRUE);
}
break;
case MANDA_CMD_RELEASE_BACKEND: {
guint32 backend_id;

if (NULL == payload) goto error;
if (!read_net_uint32(payload, &pos, &backend_id)) goto error;
if (pos != payload->len) goto error;

if (backend_id == 0) goto error; /* invalid id */

if (!manda_idlist_is_used(scon->idlist, backend_id)) goto error;
manda_idlist_put(scon->idlist, backend_id);

manda_server_release_backend(scon, backend_id);
}
break;
case MANDA_CMD_UPDATE_BACKEND: {
guint32 backend_id, load, workers;

if (NULL == payload) goto error;
if (!read_net_uint32(payload, &pos, &backend_id)) goto error;
if (!read_net_uint32(payload, &pos, &load)) goto error;
if (!read_net_uint32(payload, &pos, &workers)) goto error;
if (pos != payload->len) goto error;

if (backend_id == 0) goto error; /* invalid id */

if (!manda_idlist_is_used(scon->idlist, backend_id)) goto error;

sbackend_update(scon, backend_id, load, workers);
}
break;

case MANDA_CMD_UNKNOWN_COMMAND:
/* we require all our commands to be handled: */
goto error;

default:
send_unkown_command(con, mesg_command, mesg_req_id);
break;
}

goto out;

error:
manda_server_con_close(scon);

out:
LEAVE(srv, manda_server_free);
LEAVE(scon, scon_free);
LEAVE(con, _con_free);
}

+ 21
- 17
libmanda.h View File

@@ -29,6 +29,8 @@ typedef struct manda_client_backend_callbacks manda_client_backend_callbacks;
typedef struct manda_client_backend manda_client_backend;
typedef struct manda_client manda_client;

typedef struct manda_connection manda_connection;

typedef void (*manda_fd_watcher_cb)(manda_fd_watcher *watcher);

typedef void (*manda_new_fd_watcher)(gpointer srv, manda_fd_watcher *watcher);
@@ -78,20 +80,20 @@ struct manda_timeout {

/* Server API */

typedef void (*manda_server_new_connection)(gpointer srv, manda_server_connection *con);
typedef void (*manda_server_closed_connection)(gpointer srv, manda_server_connection *con);
typedef void (*manda_server_new_connection_cb)(gpointer srv, manda_server_connection *con);
typedef void (*manda_server_closed_connection_cb)(gpointer srv, manda_server_connection *con);

typedef void (*manda_server_bind_backend)(gpointer srv, manda_server_connection *con, GString *name, guint16 reqid);
typedef void (*manda_server_update_backend)(gpointer srv, manda_server_backend *backend, guint ndx);
typedef void (*manda_server_release_backend)(gpointer srv, manda_server_backend *backend, guint old_ndx, manda_server_backend_use *old_use);
typedef void (*manda_server_bind_backend_cb)(gpointer srv, manda_server_connection *con, GString *name, guint16 reqid);
typedef void (*manda_server_update_backend_cb)(gpointer srv, manda_server_backend *backend, guint ndx);
typedef void (*manda_server_release_backend_cb)(gpointer srv, manda_server_backend *backend, guint old_ndx, manda_server_backend_use *old_use);

struct manda_server_callbacks {
manda_server_new_connection new_connection;
manda_server_closed_connection closed_connection;
manda_server_new_connection_cb new_connection;
manda_server_closed_connection_cb closed_connection;

manda_server_bind_backend bind_backend;
manda_server_update_backend update_backend;
manda_server_release_backend release_backend;
manda_server_bind_backend_cb bind_backend;
manda_server_update_backend_cb update_backend;
manda_server_release_backend_cb release_backend;
};

struct manda_server_connection {
@@ -100,7 +102,8 @@ struct manda_server_connection {

/* private from here */
gint refcount;
gboolean delete_later;

manda_connection *con;

GPtrArray *backends; /* manda_server_backend_use */
manda_IDList *idlist;
@@ -110,7 +113,7 @@ struct manda_server_backend_use {
manda_server_connection *con;
guint32 backend_id;

guint32 last_load, last_backends;
guint32 last_load, last_workers;

/* private from here */
manda_server_backend *backend;
@@ -126,7 +129,6 @@ struct manda_server_backend {

/* private from here */
gint refcount;
gboolean delete_later;
};

struct manda_server {
@@ -138,7 +140,7 @@ struct manda_server {
const manda_async_ctrl *ctrl;
const manda_server_callbacks *callbacks;

GArray *sockets;
GPtrArray *sockets;
};

manda_server* manda_server_new(gpointer srv, const manda_async_ctrl *ctrl, const manda_server_callbacks *callbacks);
@@ -153,10 +155,12 @@ void manda_server_add_socket(manda_server *s, int fd, gpointer data);
void manda_server_con_close(manda_server_connection *con);

manda_server_backend *manda_server_backend_new(gpointer data, GString *addr);
void manda_server_backend_free(manda_server_backend *backend);
void manda_server_backend_acquire(manda_server_backend *backend);
void manda_server_backend_release(manda_server_backend *backend);

void manda_server_return_backend(manda_server_connection *con, gint16 reqid, manda_server_backend *backend);
void manda_server_drop_backend(manda_server_backend *backend);
gboolean manda_server_return_backend(manda_server_connection *con, gint16 reqid, manda_server_backend *backend);
void manda_server_return_backend_fail(manda_server_connection *con, gint16 reqid, GString *errmsg);
void manda_server_drop_backend(manda_server_backend *backend); /* tell all users that the backend is gone */

/* Client API */



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