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mlm_server_engine.inc
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mlm_server_engine.inc
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/* =========================================================================
mlm_server_engine - mlm_server engine
** WARNING *************************************************************
THIS SOURCE FILE IS 100% GENERATED. If you edit this file, you will lose
your changes at the next build cycle. This is great for temporary printf
statements. DO NOT MAKE ANY CHANGES YOU WISH TO KEEP. The correct places
for commits are:
* The XML model used for this code generation: mlm_server.xml, or
* The code generation script that built this file: zproto_server_c
************************************************************************
Copyright (c) the Contributors as noted in the AUTHORS file.
This file is part of the Malamute Project.
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
=========================================================================
*/
// ---------------------------------------------------------------------------
// State machine constants
typedef enum {
start_state = 1,
connected_state = 2,
defaults_state = 3,
settling_state = 4
} state_t;
typedef enum {
NULL_event = 0,
terminate_event = 1,
connection_open_event = 2,
stream_write_event = 3,
stream_read_event = 4,
stream_send_event = 5,
mailbox_send_event = 6,
service_send_event = 7,
service_offer_event = 8,
confirm_event = 9,
credit_event = 10,
connection_ping_event = 11,
connection_close_event = 12,
stream_message_event = 13,
mailbox_message_event = 14,
service_message_event = 15,
expired_event = 16,
exception_event = 17,
settled_event = 18
} event_t;
// Names for state machine logging and error reporting
static char *
s_state_name [] = {
"(NONE)",
"start",
"connected",
"defaults",
"settling"
};
static char *
s_event_name [] = {
"(NONE)",
"terminate",
"CONNECTION_OPEN",
"STREAM_WRITE",
"STREAM_READ",
"STREAM_SEND",
"MAILBOX_SEND",
"SERVICE_SEND",
"SERVICE_OFFER",
"CONFIRM",
"CREDIT",
"CONNECTION_PING",
"CONNECTION_CLOSE",
"stream_message",
"mailbox_message",
"service_message",
"expired",
"exception",
"settled"
};
// ---------------------------------------------------------------------------
// Context for the whole server task. This embeds the application-level
// server context at its start (the entire structure, not a reference),
// so we can cast a pointer between server_t and s_server_t arbitrarily.
typedef struct {
server_t server; // Application-level server context
zsock_t *pipe; // Socket to back to caller API
zsock_t *router; // Socket to talk to clients
int port; // Server port bound to
zloop_t *loop; // Reactor for server sockets
mlm_proto_t *message; // Message received or sent
zhash_t *clients; // Clients we're connected to
zconfig_t *config; // Configuration tree
uint client_id; // Client identifier counter
size_t timeout; // Default client expiry timeout
bool verbose; // Verbose logging enabled?
char *log_prefix; // Default log prefix
} s_server_t;
// ---------------------------------------------------------------------------
// Context for each connected client. This embeds the application-level
// client context at its start (the entire structure, not a reference),
// so we can cast a pointer between client_t and s_client_t arbitrarily.
typedef struct {
client_t client; // Application-level client context
s_server_t *server; // Parent server context
char *hashkey; // Key into server->clients hash
zframe_t *routing_id; // Routing_id back to client
uint unique_id; // Client identifier in server
state_t state; // Current state
event_t event; // Current event
event_t next_event; // The next event
event_t exception; // Exception event, if any
int wakeup; // zloop timer for client alarms
void *ticket; // zloop ticket for client timeouts
event_t wakeup_event; // Wake up with this event
char log_prefix [41]; // Log prefix string
} s_client_t;
static int
server_initialize (server_t *self);
static void
server_terminate (server_t *self);
static zmsg_t *
server_method (server_t *self, const char *method, zmsg_t *msg);
static int
client_initialize (client_t *self);
static void
client_terminate (client_t *self);
static void
s_client_execute (s_client_t *client, event_t event);
static int
s_client_handle_wakeup (zloop_t *loop, int timer_id, void *argument);
static int
s_client_handle_ticket (zloop_t *loop, int timer_id, void *argument);
static void
register_new_client (client_t *self);
static void
check_for_mailbox_messages (client_t *self);
static void
signal_command_invalid (client_t *self);
static void
store_stream_writer (client_t *self);
static void
store_stream_reader (client_t *self);
static void
write_message_to_stream (client_t *self);
static void
write_message_to_mailbox (client_t *self);
static void
write_message_to_service (client_t *self);
static void
store_service_offer (client_t *self);
static void
dispatch_the_service (client_t *self);
static void
have_message_confirmation (client_t *self);
static void
credit_the_client (client_t *self);
static void
client_closed_connection (client_t *self);
static void
deregister_the_client (client_t *self);
static void
allow_time_to_settle (client_t *self);
static void
get_message_to_deliver (client_t *self);
static void
client_expired (client_t *self);
static void
client_had_exception (client_t *self);
// ---------------------------------------------------------------------------
// These methods are an internal API for actions
// Set the next event, needed in at least one action in an internal
// state; otherwise the state machine will wait for a message on the
// router socket and treat that as the event.
static void
engine_set_next_event (client_t *client, event_t event)
{
if (client) {
s_client_t *self = (s_client_t *) client;
self->next_event = event;
}
}
// Raise an exception with 'event', halting any actions in progress.
// Continues execution of actions defined for the exception event.
static void
engine_set_exception (client_t *client, event_t event)
{
if (client) {
s_client_t *self = (s_client_t *) client;
self->exception = event;
}
}
// Set wakeup alarm after 'delay' msecs. The next state should
// handle the wakeup event. The alarm is cancelled on any other
// event.
static void
engine_set_wakeup_event (client_t *client, size_t delay, event_t event)
{
if (client) {
s_client_t *self = (s_client_t *) client;
if (self->wakeup) {
zloop_timer_end (self->server->loop, self->wakeup);
self->wakeup = 0;
}
self->wakeup = zloop_timer (
self->server->loop, delay, 1, s_client_handle_wakeup, self);
self->wakeup_event = event;
}
}
// Execute 'event' on specified client. Use this to send events to
// other clients. Cancels any wakeup alarm on that client.
static void
engine_send_event (client_t *client, event_t event)
{
if (client) {
s_client_t *self = (s_client_t *) client;
s_client_execute (self, event);
}
}
// Execute 'event' on all clients known to the server. If you pass a
// client argument, that client will not receive the broadcast. If you
// want to pass any arguments, store them in the server context.
static void
engine_broadcast_event (server_t *server, client_t *client, event_t event)
{
if (server) {
s_server_t *self = (s_server_t *) server;
zlist_t *keys = zhash_keys (self->clients);
char *key = (char *) zlist_first (keys);
while (key) {
s_client_t *target = (s_client_t *) zhash_lookup (self->clients, key);
if (target != (s_client_t *) client)
s_client_execute (target, event);
key = (char *) zlist_next (keys);
}
zlist_destroy (&keys);
}
}
// Poll actor or zsock for activity, invoke handler on any received
// message. Handler must be a CZMQ zloop_fn function; receives server
// as arg.
static void
engine_handle_socket (server_t *server, void *sock, zloop_reader_fn handler)
{
if (server) {
s_server_t *self = (s_server_t *) server;
// Resolve zactor_t -> zsock_t
if (zactor_is (sock))
sock = zactor_sock ((zactor_t *) sock);
else
assert (zsock_is (sock));
if (handler != NULL) {
int rc = zloop_reader (self->loop, (zsock_t *) sock, handler, self);
assert (rc == 0);
zloop_reader_set_tolerant (self->loop, (zsock_t *) sock);
}
else
zloop_reader_end (self->loop, (zsock_t *) sock);
}
}
// Register monitor function that will be called at regular intervals
// by the server engine
static void
engine_set_monitor (server_t *server, size_t interval, zloop_timer_fn monitor)
{
if (server) {
s_server_t *self = (s_server_t *) server;
int rc = zloop_timer (self->loop, interval, 0, monitor, self);
assert (rc >= 0);
}
}
// Set log file prefix; this string will be added to log data, to make
// log data more searchable. The string is truncated to ~20 chars.
static void
engine_set_log_prefix (client_t *client, const char *string)
{
if (client) {
s_client_t *self = (s_client_t *) client;
snprintf (self->log_prefix, sizeof (self->log_prefix) - 1,
"%6d:%-33s", self->unique_id, string);
}
}
// Set a configuration value in the server's configuration tree. The
// properties this engine uses are: server/verbose, server/timeout, and
// server/background. You can also configure other abitrary properties.
static void
engine_configure (server_t *server, const char *path, const char *value)
{
if (server) {
s_server_t *self = (s_server_t *) server;
zconfig_put (self->config, path, value);
}
}
// Return true if server is running in verbose mode, else return false.
static bool
engine_verbose (server_t *server)
{
if (server) {
s_server_t *self = (s_server_t *) server;
return self->verbose;
}
return false;
}
// Pedantic compilers don't like unused functions, so we call the whole
// API, passing null references. It's nasty and horrid and sufficient.
static void
s_satisfy_pedantic_compilers (void)
{
engine_set_next_event (NULL, NULL_event);
engine_set_exception (NULL, NULL_event);
engine_set_wakeup_event (NULL, 0, NULL_event);
engine_send_event (NULL, NULL_event);
engine_broadcast_event (NULL, NULL, NULL_event);
engine_handle_socket (NULL, 0, NULL);
engine_set_monitor (NULL, 0, NULL);
engine_set_log_prefix (NULL, NULL);
engine_configure (NULL, NULL, NULL);
engine_verbose (NULL);
}
// ---------------------------------------------------------------------------
// Generic methods on protocol messages
// TODO: replace with lookup table, since ID is one byte
static event_t
s_protocol_event (mlm_proto_t *message)
{
assert (message);
switch (mlm_proto_id (message)) {
case MLM_PROTO_CONNECTION_OPEN:
return connection_open_event;
break;
case MLM_PROTO_CONNECTION_PING:
return connection_ping_event;
break;
case MLM_PROTO_CONNECTION_CLOSE:
return connection_close_event;
break;
case MLM_PROTO_STREAM_WRITE:
return stream_write_event;
break;
case MLM_PROTO_STREAM_READ:
return stream_read_event;
break;
case MLM_PROTO_STREAM_SEND:
return stream_send_event;
break;
case MLM_PROTO_MAILBOX_SEND:
return mailbox_send_event;
break;
case MLM_PROTO_SERVICE_SEND:
return service_send_event;
break;
case MLM_PROTO_SERVICE_OFFER:
return service_offer_event;
break;
case MLM_PROTO_CREDIT:
return credit_event;
break;
case MLM_PROTO_CONFIRM:
return confirm_event;
break;
default:
// Invalid mlm_proto_t
return terminate_event;
}
}
// ---------------------------------------------------------------------------
// Client methods
static s_client_t *
s_client_new (s_server_t *server, zframe_t *routing_id)
{
s_client_t *self = (s_client_t *) zmalloc (sizeof (s_client_t));
assert (self);
assert ((s_client_t *) &self->client == self);
self->server = server;
self->hashkey = zframe_strhex (routing_id);
self->routing_id = zframe_dup (routing_id);
self->unique_id = server->client_id++;
engine_set_log_prefix (&self->client, server->log_prefix);
self->client.server = (server_t *) server;
self->client.message = server->message;
// If expiry timers are being used, create client ticket
if (server->timeout)
self->ticket = zloop_ticket (server->loop, s_client_handle_ticket, self);
// Give application chance to initialize and set next event
self->state = start_state;
self->event = NULL_event;
client_initialize (&self->client);
return self;
}
static void
s_client_destroy (s_client_t **self_p)
{
assert (self_p);
if (*self_p) {
s_client_t *self = *self_p;
if (self->wakeup)
zloop_timer_end (self->server->loop, self->wakeup);
if (self->ticket)
zloop_ticket_delete (self->server->loop, self->ticket);
zframe_destroy (&self->routing_id);
// Provide visual clue if application misuses client reference
engine_set_log_prefix (&self->client, "*** TERMINATED ***");
client_terminate (&self->client);
free (self->hashkey);
free (self);
*self_p = NULL;
}
}
// Callback when we remove client from 'clients' hash table
static void
s_client_free (void *argument)
{
s_client_t *client = (s_client_t *) argument;
s_client_destroy (&client);
}
// Execute state machine as long as we have events
static void
s_client_execute (s_client_t *self, event_t event)
{
self->next_event = event;
// Cancel wakeup timer, if any was pending
if (self->wakeup) {
zloop_timer_end (self->server->loop, self->wakeup);
self->wakeup = 0;
}
while (self->next_event > 0) {
self->event = self->next_event;
self->next_event = NULL_event;
self->exception = NULL_event;
if (self->server->verbose) {
zsys_debug ("%s: %s:",
self->log_prefix, s_state_name [self->state]);
zsys_debug ("%s: %s",
self->log_prefix, s_event_name [self->event]);
}
switch (self->state) {
case start_state:
if (self->event == connection_open_event) {
if (!self->exception) {
// register new client
if (self->server->verbose)
zsys_debug ("%s: $ register new client", self->log_prefix);
register_new_client (&self->client);
}
if (!self->exception) {
// send OK
if (self->server->verbose)
zsys_debug ("%s: $ send OK",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_OK);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// check for mailbox messages
if (self->server->verbose)
zsys_debug ("%s: $ check for mailbox messages", self->log_prefix);
check_for_mailbox_messages (&self->client);
}
if (!self->exception)
self->state = connected_state;
}
else
if (self->event == connection_close_event) {
if (!self->exception) {
// send OK
if (self->server->verbose)
zsys_debug ("%s: $ send OK",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_OK);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// client closed connection
if (self->server->verbose)
zsys_debug ("%s: $ client closed connection", self->log_prefix);
client_closed_connection (&self->client);
}
if (!self->exception) {
// deregister the client
if (self->server->verbose)
zsys_debug ("%s: $ deregister the client", self->log_prefix);
deregister_the_client (&self->client);
}
if (!self->exception) {
// allow time to settle
if (self->server->verbose)
zsys_debug ("%s: $ allow time to settle", self->log_prefix);
allow_time_to_settle (&self->client);
}
if (!self->exception)
self->state = settling_state;
}
else
if (self->event == stream_message_event) {
if (!self->exception) {
// get message to deliver
if (self->server->verbose)
zsys_debug ("%s: $ get message to deliver", self->log_prefix);
get_message_to_deliver (&self->client);
}
if (!self->exception) {
// send STREAM_DELIVER
if (self->server->verbose)
zsys_debug ("%s: $ send STREAM_DELIVER",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_STREAM_DELIVER);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception)
self->state = connected_state;
}
else
if (self->event == mailbox_message_event) {
if (!self->exception) {
// get message to deliver
if (self->server->verbose)
zsys_debug ("%s: $ get message to deliver", self->log_prefix);
get_message_to_deliver (&self->client);
}
if (!self->exception) {
// send MAILBOX_DELIVER
if (self->server->verbose)
zsys_debug ("%s: $ send MAILBOX_DELIVER",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_MAILBOX_DELIVER);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// check for mailbox messages
if (self->server->verbose)
zsys_debug ("%s: $ check for mailbox messages", self->log_prefix);
check_for_mailbox_messages (&self->client);
}
if (!self->exception)
self->state = connected_state;
}
else
if (self->event == service_message_event) {
if (!self->exception) {
// get message to deliver
if (self->server->verbose)
zsys_debug ("%s: $ get message to deliver", self->log_prefix);
get_message_to_deliver (&self->client);
}
if (!self->exception) {
// send SERVICE_DELIVER
if (self->server->verbose)
zsys_debug ("%s: $ send SERVICE_DELIVER",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_SERVICE_DELIVER);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception)
self->state = connected_state;
}
else
if (self->event == expired_event) {
if (!self->exception) {
// client expired
if (self->server->verbose)
zsys_debug ("%s: $ client expired", self->log_prefix);
client_expired (&self->client);
}
if (!self->exception) {
// deregister the client
if (self->server->verbose)
zsys_debug ("%s: $ deregister the client", self->log_prefix);
deregister_the_client (&self->client);
}
if (!self->exception) {
// allow time to settle
if (self->server->verbose)
zsys_debug ("%s: $ allow time to settle", self->log_prefix);
allow_time_to_settle (&self->client);
}
if (!self->exception)
self->state = settling_state;
}
else
if (self->event == exception_event) {
if (!self->exception) {
// send ERROR
if (self->server->verbose)
zsys_debug ("%s: $ send ERROR",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_ERROR);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// client had exception
if (self->server->verbose)
zsys_debug ("%s: $ client had exception", self->log_prefix);
client_had_exception (&self->client);
}
if (!self->exception) {
// deregister the client
if (self->server->verbose)
zsys_debug ("%s: $ deregister the client", self->log_prefix);
deregister_the_client (&self->client);
}
if (!self->exception) {
// allow time to settle
if (self->server->verbose)
zsys_debug ("%s: $ allow time to settle", self->log_prefix);
allow_time_to_settle (&self->client);
}
if (!self->exception)
self->state = settling_state;
}
else {
// Handle unexpected protocol events
if (!self->exception) {
// signal command invalid
if (self->server->verbose)
zsys_debug ("%s: $ signal command invalid", self->log_prefix);
signal_command_invalid (&self->client);
}
if (!self->exception) {
// send ERROR
if (self->server->verbose)
zsys_debug ("%s: $ send ERROR",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_ERROR);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
}
break;
case connected_state:
if (self->event == stream_write_event) {
if (!self->exception) {
// store stream writer
if (self->server->verbose)
zsys_debug ("%s: $ store stream writer", self->log_prefix);
store_stream_writer (&self->client);
}
if (!self->exception) {
// send OK
if (self->server->verbose)
zsys_debug ("%s: $ send OK",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_OK);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
}
else
if (self->event == stream_read_event) {
if (!self->exception) {
// store stream reader
if (self->server->verbose)
zsys_debug ("%s: $ store stream reader", self->log_prefix);
store_stream_reader (&self->client);
}
if (!self->exception) {
// send OK
if (self->server->verbose)
zsys_debug ("%s: $ send OK",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_OK);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
}
else
if (self->event == stream_send_event) {
if (!self->exception) {
// write message to stream
if (self->server->verbose)
zsys_debug ("%s: $ write message to stream", self->log_prefix);
write_message_to_stream (&self->client);
}
}
else
if (self->event == mailbox_send_event) {
if (!self->exception) {
// write message to mailbox
if (self->server->verbose)
zsys_debug ("%s: $ write message to mailbox", self->log_prefix);
write_message_to_mailbox (&self->client);
}
}
else
if (self->event == service_send_event) {
if (!self->exception) {
// write message to service
if (self->server->verbose)
zsys_debug ("%s: $ write message to service", self->log_prefix);
write_message_to_service (&self->client);
}
}
else
if (self->event == service_offer_event) {
if (!self->exception) {
// store service offer
if (self->server->verbose)
zsys_debug ("%s: $ store service offer", self->log_prefix);
store_service_offer (&self->client);
}
if (!self->exception) {
// send OK
if (self->server->verbose)
zsys_debug ("%s: $ send OK",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_OK);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// dispatch the service
if (self->server->verbose)
zsys_debug ("%s: $ dispatch the service", self->log_prefix);
dispatch_the_service (&self->client);
}
}
else
if (self->event == confirm_event) {
if (!self->exception) {
// have message confirmation
if (self->server->verbose)
zsys_debug ("%s: $ have message confirmation", self->log_prefix);
have_message_confirmation (&self->client);
}
}
else
if (self->event == credit_event) {
if (!self->exception) {
// credit the client
if (self->server->verbose)
zsys_debug ("%s: $ credit the client", self->log_prefix);
credit_the_client (&self->client);
}
}
else
if (self->event == connection_ping_event) {
if (!self->exception) {
// send CONNECTION_PONG
if (self->server->verbose)
zsys_debug ("%s: $ send CONNECTION_PONG",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_CONNECTION_PONG);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
}
else
if (self->event == connection_close_event) {
if (!self->exception) {
// send OK
if (self->server->verbose)
zsys_debug ("%s: $ send OK",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_OK);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// client closed connection
if (self->server->verbose)
zsys_debug ("%s: $ client closed connection", self->log_prefix);
client_closed_connection (&self->client);
}
if (!self->exception) {
// deregister the client
if (self->server->verbose)
zsys_debug ("%s: $ deregister the client", self->log_prefix);
deregister_the_client (&self->client);
}
if (!self->exception) {
// allow time to settle
if (self->server->verbose)
zsys_debug ("%s: $ allow time to settle", self->log_prefix);
allow_time_to_settle (&self->client);
}
if (!self->exception)
self->state = settling_state;
}
else
if (self->event == stream_message_event) {
if (!self->exception) {
// get message to deliver
if (self->server->verbose)
zsys_debug ("%s: $ get message to deliver", self->log_prefix);
get_message_to_deliver (&self->client);
}
if (!self->exception) {
// send STREAM_DELIVER
if (self->server->verbose)
zsys_debug ("%s: $ send STREAM_DELIVER",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_STREAM_DELIVER);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception)
self->state = connected_state;
}
else
if (self->event == mailbox_message_event) {
if (!self->exception) {
// get message to deliver
if (self->server->verbose)
zsys_debug ("%s: $ get message to deliver", self->log_prefix);
get_message_to_deliver (&self->client);
}
if (!self->exception) {
// send MAILBOX_DELIVER
if (self->server->verbose)
zsys_debug ("%s: $ send MAILBOX_DELIVER",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_MAILBOX_DELIVER);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// check for mailbox messages
if (self->server->verbose)
zsys_debug ("%s: $ check for mailbox messages", self->log_prefix);
check_for_mailbox_messages (&self->client);
}
if (!self->exception)
self->state = connected_state;
}
else
if (self->event == service_message_event) {
if (!self->exception) {
// get message to deliver
if (self->server->verbose)
zsys_debug ("%s: $ get message to deliver", self->log_prefix);
get_message_to_deliver (&self->client);
}
if (!self->exception) {
// send SERVICE_DELIVER
if (self->server->verbose)
zsys_debug ("%s: $ send SERVICE_DELIVER",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_SERVICE_DELIVER);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception)
self->state = connected_state;
}
else
if (self->event == expired_event) {
if (!self->exception) {
// client expired
if (self->server->verbose)
zsys_debug ("%s: $ client expired", self->log_prefix);
client_expired (&self->client);
}
if (!self->exception) {
// deregister the client
if (self->server->verbose)
zsys_debug ("%s: $ deregister the client", self->log_prefix);
deregister_the_client (&self->client);
}
if (!self->exception) {
// allow time to settle
if (self->server->verbose)
zsys_debug ("%s: $ allow time to settle", self->log_prefix);
allow_time_to_settle (&self->client);
}
if (!self->exception)
self->state = settling_state;
}
else
if (self->event == exception_event) {
if (!self->exception) {
// send ERROR
if (self->server->verbose)
zsys_debug ("%s: $ send ERROR",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_ERROR);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// client had exception
if (self->server->verbose)
zsys_debug ("%s: $ client had exception", self->log_prefix);
client_had_exception (&self->client);
}
if (!self->exception) {
// deregister the client
if (self->server->verbose)
zsys_debug ("%s: $ deregister the client", self->log_prefix);
deregister_the_client (&self->client);
}
if (!self->exception) {
// allow time to settle
if (self->server->verbose)
zsys_debug ("%s: $ allow time to settle", self->log_prefix);
allow_time_to_settle (&self->client);
}
if (!self->exception)
self->state = settling_state;
}
else {
// Handle unexpected protocol events
if (!self->exception) {
// signal command invalid
if (self->server->verbose)
zsys_debug ("%s: $ signal command invalid", self->log_prefix);
signal_command_invalid (&self->client);
}
if (!self->exception) {
// send ERROR
if (self->server->verbose)
zsys_debug ("%s: $ send ERROR",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_ERROR);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// deregister the client
if (self->server->verbose)
zsys_debug ("%s: $ deregister the client", self->log_prefix);
deregister_the_client (&self->client);
}
if (!self->exception) {
// allow time to settle
if (self->server->verbose)
zsys_debug ("%s: $ allow time to settle", self->log_prefix);
allow_time_to_settle (&self->client);
}
if (!self->exception)
self->state = settling_state;
}
break;
case defaults_state:
if (self->event == connection_close_event) {
if (!self->exception) {
// send OK
if (self->server->verbose)
zsys_debug ("%s: $ send OK",
self->log_prefix);
mlm_proto_set_id (self->server->message, MLM_PROTO_OK);
mlm_proto_set_routing_id (self->server->message, self->routing_id);
mlm_proto_send (self->server->message, self->server->router);
}
if (!self->exception) {
// client closed connection