// Get the field's location in the buffer. Return 0 if the field does not exist.
// Note that even if the field location is returned, it may contain a
// QD_AMQP_NULL value (qd_field_location->tag == QD_AMQP_NULL).
//
static qd_field_location_t *qd_message_field_location(qd_message_t *msg, qd_message_field_t field)
{
qd_message_content_t *content = MSG_CONTENT(msg);
qd_message_field_t section = qd_field_section(field);
switch (section) {
case QD_FIELD_HEADER:
return qd_message_header_field(msg, field);
case QD_FIELD_PROPERTIES:
return qd_message_properties_field(msg, field);
case QD_FIELD_DELIVERY_ANNOTATION:
if (content->section_delivery_annotation.parsed ||
(qd_message_check(msg, QD_DEPTH_DELIVERY_ANNOTATIONS) && content->section_delivery_annotation.parsed))
return &content->section_delivery_annotation;
break;
case QD_FIELD_MESSAGE_ANNOTATION:
if (content->section_message_annotation.parsed ||
(qd_message_check(msg, QD_DEPTH_MESSAGE_ANNOTATIONS) && content->section_message_annotation.parsed))
return &content->section_message_annotation;
break;
case QD_FIELD_APPLICATION_PROPERTIES:
if (content->section_application_properties.parsed ||
(qd_message_check(msg, QD_DEPTH_APPLICATION_PROPERTIES) && content->section_application_properties.parsed))
return &content->section_application_properties;
break;
case QD_FIELD_BODY:
if (content->section_body.parsed ||
(qd_message_check(msg, QD_DEPTH_BODY) && content->section_body.parsed))
return &content->section_body;
break;
case QD_FIELD_FOOTER:
if (content->section_footer.parsed ||
(qd_message_check(msg, QD_DEPTH_ALL) && content->section_footer.parsed))
return &content->section_footer;
break;
default:
assert(false); // TBD: add support as needed
return 0;
}
return 0;
}
static void qd_io_rx_handler(void *context, qd_message_t *msg, int link_id)
{
IoAdapter *self = (IoAdapter*) context;
//
// Parse the message through the body and exit if the message is not well formed.
//
if (!qd_message_check(msg, QD_DEPTH_BODY))
return;
// This is called from non-python threads so we need to acquire the GIL to use python APIS.
qd_python_lock_state_t lock_state = qd_python_lock();
PyObject *py_msg = PyObject_CallFunction(message_type, NULL);
if (!py_msg) {
qd_error_py();
qd_python_unlock(lock_state);
return;
}
iter_to_py_attr(qd_message_field_iterator(msg, QD_FIELD_TO), py_iter_copy, py_msg, "address");
iter_to_py_attr(qd_message_field_iterator(msg, QD_FIELD_REPLY_TO), py_iter_copy, py_msg, "reply_to");
// Note: correlation ID requires _typed()
iter_to_py_attr(qd_message_field_iterator_typed(msg, QD_FIELD_CORRELATION_ID), py_iter_parse, py_msg, "correlation_id");
iter_to_py_attr(qd_message_field_iterator(msg, QD_FIELD_APPLICATION_PROPERTIES), py_iter_parse, py_msg, "properties");
iter_to_py_attr(qd_message_field_iterator(msg, QD_FIELD_BODY), py_iter_parse, py_msg, "body");
PyObject *value = PyObject_CallFunction(self->handler, "Ol", py_msg, link_id);
Py_DECREF(py_msg);
Py_XDECREF(value);
qd_error_py();
qd_python_unlock(lock_state);
}
/* TODO aconway 2014-05-13: more detailed message representation. */
char* qd_message_repr(qd_message_t *msg, char* buffer, size_t len) {
qd_message_check(msg, QD_DEPTH_BODY);
char *begin = buffer;
char *end = buffer + len - sizeof(REPR_END); /* Save space for ending */
aprintf(&begin, end, "Message{", msg);
copy_field(msg, QD_FIELD_TO, INT_MAX, "to='", "'", &begin, end);
copy_field(msg, QD_FIELD_REPLY_TO, INT_MAX, " reply-to='", "'", &begin, end);
copy_field(msg, QD_FIELD_BODY, 16, " body='", "'", &begin, end);
aprintf(&begin, end, "%s", REPR_END); /* We saved space at the beginning. */
return buffer;
}
// get the field location of a field in the message properties (if it exists,
// else 0).
static qd_field_location_t *qd_message_properties_field(qd_message_t *msg, qd_message_field_t field)
{
static const intptr_t offsets[] = {
// position of the field's qd_field_location_t in the message content
// object
(intptr_t) &((qd_message_content_t *)0)->field_message_id,
(intptr_t) &((qd_message_content_t *)0)->field_user_id,
(intptr_t) &((qd_message_content_t *)0)->field_to,
(intptr_t) &((qd_message_content_t *)0)->field_subject,
(intptr_t) &((qd_message_content_t *)0)->field_reply_to,
(intptr_t) &((qd_message_content_t *)0)->field_correlation_id
};
// update table above if new fields need to be accessed:
assert(QD_FIELD_MESSAGE_ID <= field && field <= QD_FIELD_CORRELATION_ID);
qd_message_content_t *content = MSG_CONTENT(msg);
if (!content->section_message_properties.parsed) {
if (!qd_message_check(msg, QD_DEPTH_PROPERTIES) || !content->section_message_properties.parsed)
return 0;
}
if (field == QD_FIELD_PROPERTIES) return &content->section_message_properties;
const int index = field - QD_FIELD_MESSAGE_ID;
qd_field_location_t *const location = (qd_field_location_t *)((char *)content + offsets[index]);
if (location->parsed)
return location;
// requested field not parsed out. Need to parse out up to the requested field:
qd_buffer_t *buffer = content->section_message_properties.buffer;
unsigned char *cursor = qd_buffer_base(buffer) + content->section_message_properties.offset;
advance(&cursor, &buffer, content->section_message_properties.hdr_length, 0, 0);
if (index >= start_list(&cursor, &buffer)) return 0; // properties list too short
int position = 0;
while (position < index) {
qd_field_location_t *f = (qd_field_location_t *)((char *)content + offsets[position]);
if (f->parsed)
advance(&cursor, &buffer, f->hdr_length + f->length, 0, 0);
else // parse it out
if (!traverse_field(&cursor, &buffer, f)) return 0;
position++;
}
// all fields previous to the target have now been parsed and cursor/buffer
// are in the correct position, parse out the field:
if (traverse_field(&cursor, &buffer, location))
return location;
return 0;
}
// get the field location of a field in the message header (if it exists,
// else 0)
static qd_field_location_t *qd_message_header_field(qd_message_t *msg, qd_message_field_t field)
{
qd_message_content_t *content = MSG_CONTENT(msg);
if (!content->section_message_header.parsed) {
if (!qd_message_check(msg, QD_DEPTH_HEADER) || !content->section_message_header.parsed)
return 0;
}
switch (field) {
case QD_FIELD_HEADER:
return &content->section_message_properties;
default:
// TBD: add header fields as needed (see qd_message_properties_field()
// as an example)
assert(false);
return 0;
}
}
void qd_message_send(qd_message_t *in_msg,
qd_link_t *link,
bool strip_annotations)
{
qd_message_pvt_t *msg = (qd_message_pvt_t*) in_msg;
qd_message_content_t *content = msg->content;
qd_buffer_t *buf = DEQ_HEAD(content->buffers);
unsigned char *cursor;
pn_link_t *pnl = qd_link_pn(link);
char repr[qd_message_repr_len()];
qd_log(log_source, QD_LOG_TRACE, "Sending %s on link %s",
qd_message_repr(in_msg, repr, sizeof(repr)),
pn_link_name(pnl));
qd_buffer_list_t new_ma;
DEQ_INIT(new_ma);
if (strip_annotations || compose_message_annotations(msg, &new_ma)) {
//
// This is the case where the message annotations have been modified.
// The message send must be divided into sections: The existing header;
// the new message annotations; the rest of the existing message.
// Note that the original message annotations that are still in the
// buffer chain must not be sent.
//
// Start by making sure that we've parsed the message sections through
// the message annotations
//
// ??? NO LONGER NECESSARY???
if (!qd_message_check(in_msg, QD_DEPTH_MESSAGE_ANNOTATIONS)) {
qd_log(log_source, QD_LOG_ERROR, "Cannot send: %s", qd_error_message);
return;
}
//
// Send header if present
//
cursor = qd_buffer_base(buf);
if (content->section_message_header.length > 0) {
buf = content->section_message_header.buffer;
cursor = content->section_message_header.offset + qd_buffer_base(buf);
advance(&cursor, &buf,
content->section_message_header.length + content->section_message_header.hdr_length,
send_handler, (void*) pnl);
}
//
// Send new message annotations
//
qd_buffer_t *da_buf = DEQ_HEAD(new_ma);
while (da_buf) {
pn_link_send(pnl, (char*) qd_buffer_base(da_buf), qd_buffer_size(da_buf));
da_buf = DEQ_NEXT(da_buf);
}
qd_buffer_list_free_buffers(&new_ma);
//
// Skip over replaced message annotations
//
if (content->section_message_annotation.length > 0)
advance(&cursor, &buf,
content->section_message_annotation.hdr_length + content->section_message_annotation.length,
0, 0);
//
// Send remaining partial buffer
//
if (buf) {
size_t len = qd_buffer_size(buf) - (cursor - qd_buffer_base(buf));
advance(&cursor, &buf, len, send_handler, (void*) pnl);
}
// Fall through to process the remaining buffers normally
// Note that 'advance' will have moved us to the next buffer in the chain.
}
while (buf) {
pn_link_send(pnl, (char*) qd_buffer_base(buf), qd_buffer_size(buf));
buf = DEQ_NEXT(buf);
}
}
/**
* Inbound Delivery Handler
*/
static void AMQP_rx_handler(void* context, qd_link_t *link, pn_delivery_t *pnd)
{
qd_router_t *router = (qd_router_t*) context;
pn_link_t *pn_link = qd_link_pn(link);
qdr_link_t *rlink = (qdr_link_t*) qd_link_get_context(link);
qdr_delivery_t *delivery = 0;
qd_message_t *msg;
//
// Receive the message into a local representation. If the returned message
// pointer is NULL, we have not yet received a complete message.
//
// Note: In the link-routing case, consider cutting the message through. There's
// no reason to wait for the whole message to be received before starting to
// send it.
//
msg = qd_message_receive(pnd);
if (!msg)
return;
//
// Consume the delivery.
//
pn_link_advance(pn_link);
//
// If there's no router link, free the message and finish. It's likely that the link
// is closing.
//
if (!rlink) {
qd_message_free(msg);
return;
}
//
// Handle the link-routed case
//
if (qdr_link_is_routed(rlink)) {
pn_delivery_tag_t dtag = pn_delivery_tag(pnd);
delivery = qdr_link_deliver_to_routed_link(rlink, msg, pn_delivery_settled(pnd), (uint8_t*) dtag.start, dtag.size);
if (delivery) {
if (pn_delivery_settled(pnd))
pn_delivery_settle(pnd);
else {
pn_delivery_set_context(pnd, delivery);
qdr_delivery_set_context(delivery, pnd);
qdr_delivery_incref(delivery);
}
}
return;
}
//
// Determine if the incoming link is anonymous. If the link is addressed,
// there are some optimizations we can take advantage of.
//
bool anonymous_link = qdr_link_is_anonymous(rlink);
//
// Determine if the user of this connection is allowed to proxy the
// user_id of messages. A message user_id is proxied when the
// property value differs from the authenticated user name of the connection.
// If the user is not allowed to proxy the user_id then the message user_id
// must be blank or it must be equal to the connection user name.
//
bool check_user = false;
qd_connection_t *conn = qd_link_connection(link);
if (conn->policy_settings)
check_user = !conn->policy_settings->allowUserIdProxy;
//
// Validate the content of the delivery as an AMQP message. This is done partially, only
// to validate that we can find the fields we need to route the message.
//
// If the link is anonymous, we must validate through the message properties to find the
// 'to' field. If the link is not anonymous, we don't need the 'to' field as we will be
// using the address from the link target.
//
qd_message_depth_t validation_depth = (anonymous_link || check_user) ? QD_DEPTH_PROPERTIES : QD_DEPTH_MESSAGE_ANNOTATIONS;
bool valid_message = qd_message_check(msg, validation_depth);
if (valid_message) {
if (check_user) {
// This connection must not allow proxied user_id
qd_iterator_t *userid_iter = qd_message_field_iterator(msg, QD_FIELD_USER_ID);
if (userid_iter) {
// The user_id property has been specified
if (qd_iterator_remaining(userid_iter) > 0) {
// user_id property in message is not blank
if (!qd_iterator_equal(userid_iter, (const unsigned char *)conn->user_id)) {
// This message is rejected: attempted user proxy is disallowed
qd_log(router->log_source, QD_LOG_DEBUG, "Message rejected due to user_id proxy violation. User:%s", conn->user_id);
pn_link_flow(pn_link, 1);
pn_delivery_update(pnd, PN_REJECTED);
pn_delivery_settle(pnd);
qd_message_free(msg);
qd_iterator_free(userid_iter);
return;
}
}
qd_iterator_free(userid_iter);
}
}
qd_parsed_field_t *in_ma = qd_message_message_annotations(msg);
qd_bitmask_t *link_exclusions;
bool strip = qdr_link_strip_annotations_in(rlink);
qd_iterator_t *ingress_iter = router_annotate_message(router, in_ma, msg, &link_exclusions, strip);
if (anonymous_link) {
qd_iterator_t *addr_iter = 0;
int phase = 0;
//
// If the message has delivery annotations, get the to-override field from the annotations.
//
if (in_ma) {
qd_parsed_field_t *ma_to = qd_parse_value_by_key(in_ma, QD_MA_TO);
if (ma_to) {
addr_iter = qd_iterator_dup(qd_parse_raw(ma_to));
phase = qd_message_get_phase_annotation(msg);
}
}
//
// Still no destination address? Use the TO field from the message properties.
//
if (!addr_iter)
addr_iter = qd_message_field_iterator(msg, QD_FIELD_TO);
if (addr_iter) {
qd_iterator_reset_view(addr_iter, ITER_VIEW_ADDRESS_HASH);
if (phase > 0)
qd_iterator_annotate_phase(addr_iter, '0' + (char) phase);
delivery = qdr_link_deliver_to(rlink, msg, ingress_iter, addr_iter, pn_delivery_settled(pnd),
link_exclusions);
}
} else {
const char *term_addr = pn_terminus_get_address(qd_link_remote_target(link));
if (!term_addr)
term_addr = pn_terminus_get_address(qd_link_source(link));
if (term_addr) {
qd_composed_field_t *to_override = qd_compose_subfield(0);
qd_compose_insert_string(to_override, term_addr);
qd_message_set_to_override_annotation(msg, to_override);
int phase = qdr_link_phase(rlink);
if (phase != 0)
qd_message_set_phase_annotation(msg, phase);
}
delivery = qdr_link_deliver(rlink, msg, ingress_iter, pn_delivery_settled(pnd), link_exclusions);
}
if (delivery) {
if (pn_delivery_settled(pnd))
pn_delivery_settle(pnd);
else {
pn_delivery_set_context(pnd, delivery);
qdr_delivery_set_context(delivery, pnd);
qdr_delivery_incref(delivery);
}
} else {
//
// The message is now and will always be unroutable because there is no address.
//
pn_link_flow(pn_link, 1);
pn_delivery_update(pnd, PN_REJECTED);
pn_delivery_settle(pnd);
qd_message_free(msg);
}
//
// Rules for delivering messages:
//
// For addressed (non-anonymous) links:
// to-override must be set (done in the core?)
// uses qdr_link_deliver to hand over to the core
//
// For anonymous links:
// If there's a to-override in the annotations, use that address
// Or, use the 'to' field in the message properties
//
} else {
//
// Message is invalid. Reject the message and don't involve the router core.
//
pn_link_flow(pn_link, 1);
pn_delivery_update(pnd, PN_REJECTED);
pn_delivery_settle(pnd);
qd_message_free(msg);
}
}
