ngx_int_t nchan_request_set_content_type_multipart_boundary_header(ngx_http_request_t *r, nchan_request_ctx_t *ctx) {
u_char *cur;
u_char *cbuf;
ngx_str_t val;
if((cbuf = ngx_palloc(r->pool, sizeof(u_char)*100)) == NULL) {
return NGX_ERROR;
}
val.data = cbuf;
cur = ngx_snprintf(cbuf, 100, "multipart/mixed; boundary=%V", nchan_request_multipart_boundary(r, ctx));
val.len = cur - cbuf;
r->headers_out.content_type = val;
return NGX_OK;
}
static ngx_int_t longpoll_multimsg_respond(full_subscriber_t *fsub) {
ngx_http_request_t *r = fsub->sub.request;
nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(r, nchan_module);
nchan_loc_conf_t *cf = fsub->sub.cf;
char *err;
ngx_int_t rc;
u_char char_boundary[50];
u_char *char_boundary_last;
ngx_int_t i;
ngx_buf_t boundary[3]; //first, mid, and last boundary
ngx_chain_t *chains, *first_chain = NULL, *last_chain = NULL;
ngx_buf_t *buf;
ngx_buf_t double_newline_buf;
ngx_str_t *content_type;
size_t size = 0;
nchan_longpoll_multimsg_t *first, *cur;
fsub->sub.dequeue_after_response = 1;
if(ctx->request_origin_header.len > 0) {
nchan_add_response_header(r, &NCHAN_HEADER_ALLOW_ORIGIN, &cf->allow_origin);
}
if(fsub->data.multimsg_first == fsub->data.multimsg_last) {
//just one message.
if((rc = nchan_respond_msg(r, fsub->data.multimsg_first->msg, &fsub->sub.last_msgid, 0, &err)) != NGX_OK) {
return abort_response(&fsub->sub, err);
}
return NGX_OK;
}
//multi messages
nchan_request_set_content_type_multipart_boundary_header(r, ctx);
char_boundary_last = ngx_snprintf(char_boundary, 50, ("\r\n--%V--\r\n"), nchan_request_multipart_boundary(r, ctx));
ngx_memzero(&double_newline_buf, sizeof(double_newline_buf));
double_newline_buf.start = (u_char *)"\r\n\r\n";
double_newline_buf.end = double_newline_buf.start + 4;
double_newline_buf.pos = double_newline_buf.start;
double_newline_buf.last = double_newline_buf.end;
double_newline_buf.memory = 1;
//set up the boundaries
for(i=0; i<3; i++) {
ngx_memzero(&boundary[i], sizeof(ngx_buf_t));
boundary[i].memory = 1;
if(i==0) {
boundary[i].start = &char_boundary[2];
boundary[i].end = &char_boundary_last[-4];
}
else if(i==1) {
boundary[i].start = &char_boundary[0];
boundary[i].end = &char_boundary_last[-4];
}
else if(i==2) {
boundary[i].start = &char_boundary[0];
boundary[i].end = char_boundary_last;
boundary[i].last_buf = 1;
boundary[i].last_in_chain = 1;
boundary[i].flush = 1;
}
boundary[i].pos = boundary[i].start;
boundary[i].last = boundary[i].end;
}
first = fsub->data.multimsg_first;
for(cur = first; cur != NULL; cur = cur->next) {
chains = ngx_palloc(r->pool, sizeof(*chains)*4);
if(last_chain) {
last_chain->next = &chains[0];
}
if(!first_chain) {
first_chain = &chains[0];
}
chains[0].buf = cur == first ? &boundary[0] : &boundary[1];
chains[0].next = &chains[1];
size += ngx_buf_size(chains[0].buf);
content_type = &cur->msg->content_type;
if (content_type->data != NULL) {
buf = ngx_pcalloc(r->pool, sizeof(*buf) + content_type->len + 25);
buf->memory = 1;
buf->start = (u_char *)&buf[1];
buf->end = ngx_snprintf(buf->start, content_type->len + 25, "\r\nContent-Type: %V\r\n\r\n", content_type);
buf->pos = buf->start;
buf->last = buf->end;
chains[1].buf = buf;
}
else {
chains[1].buf = &double_newline_buf;
}
size += ngx_buf_size(chains[1].buf);
if(ngx_buf_size(cur->msg->buf) > 0) {
chains[1].next = &chains[2];
buf = ngx_palloc(r->pool, sizeof(*buf));
ngx_memcpy(buf, cur->msg->buf, sizeof(*buf));
nchan_msg_buf_open_fd_if_needed(buf, NULL, r);
chains[2].buf = buf;
size += ngx_buf_size(chains[2].buf);
last_chain = &chains[2];
}
else {
last_chain = &chains[1];
}
if(cur->next == NULL) {
last_chain->next = &chains[3];
chains[3].buf = &boundary[2];
chains[3].next = NULL;
last_chain = &chains[3];
size += ngx_buf_size(chains[3].buf);
}
}
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = size;
nchan_set_msgid_http_response_headers(r, &fsub->data.multimsg_last->msg->id);
ngx_http_send_header(r);
nchan_output_filter(r, first_chain);
return NGX_OK;
}
static ngx_int_t longpoll_multipart_respond(full_subscriber_t *fsub) {
ngx_http_request_t *r = fsub->sub.request;
nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(r, ngx_nchan_module);
char *err;
ngx_int_t rc;
u_char *char_boundary = NULL;
u_char *char_boundary_last;
ngx_buf_t boundary[3]; //first, mid, and last boundary
ngx_buf_t newline_buf;
ngx_chain_t *chain, *first_chain = NULL, *last_chain = NULL;
ngx_buf_t *buf;
ngx_buf_t double_newline_buf;
ngx_str_t *content_type;
size_t size = 0;
nchan_loc_conf_t *cf = fsub->sub.cf;
int use_raw_stream_separator = cf->longpoll_multimsg_use_raw_stream_separator;
nchan_buf_and_chain_t *bc;
nchan_longpoll_multimsg_t *first, *cur;
//disable abort handler
fsub->data.cln->handler = empty_handler;
first = fsub->data.multimsg_first;
fsub->sub.dequeue_after_response = 1;
//cleanup to release msgs
fsub->data.cln = ngx_http_cleanup_add(fsub->sub.request, 0);
fsub->data.cln->data = first;
fsub->data.cln->handler = (ngx_http_cleanup_pt )multipart_request_cleanup_handler;
if(fsub->data.multimsg_first == fsub->data.multimsg_last) {
//just one message.
if((rc = nchan_respond_msg(r, fsub->data.multimsg_first->msg, &fsub->sub.last_msgid, 0, &err)) != NGX_OK) {
return abort_response(&fsub->sub, err);
}
return NGX_OK;
}
//multi messages
if(!use_raw_stream_separator) {
nchan_request_set_content_type_multipart_boundary_header(r, ctx);
char_boundary = ngx_palloc(r->pool, 50);
char_boundary_last = ngx_snprintf(char_boundary, 50, ("\r\n--%V--\r\n"), nchan_request_multipart_boundary(r, ctx));
ngx_init_set_membuf_char(&double_newline_buf, "\r\n\r\n");
//set up the boundaries
ngx_init_set_membuf(&boundary[0], &char_boundary[2], &char_boundary_last[-4]);
ngx_init_set_membuf(&boundary[1], &char_boundary[0], &char_boundary_last[-4]);
ngx_init_set_membuf(&boundary[2], &char_boundary[0], char_boundary_last);
ngx_init_set_membuf_char(&newline_buf, "\n");
}
int n=0;
for(cur = first; cur != NULL; cur = cur->next) {
bc = nchan_bufchain_pool_reserve(ctx->bcp, 4);
chain = &bc->chain;
n++;
if(last_chain) {
last_chain->next = chain;
}
if(!first_chain) {
first_chain = chain;
}
if(!use_raw_stream_separator) {
// each buffer needs to be unique for the purpose of dealing with nginx output guts
// (something about max. 64 iovecs per write call and counting the number of bytes already sent)
*chain->buf = cur == first ? boundary[0] : boundary[1];
size += ngx_buf_size((chain->buf));
chain = chain->next;
content_type = &cur->msg->content_type;
buf = chain->buf;
if (content_type->data != NULL) {
u_char *char_cur = ngx_pcalloc(r->pool, content_type->len + 25);
ngx_init_set_membuf(buf, char_cur, ngx_snprintf(char_cur, content_type->len + 25, "\r\nContent-Type: %V\r\n\r\n", content_type));
}
else {
*buf = double_newline_buf;
}
size += ngx_buf_size(buf);
chain = chain->next;
}
if(ngx_buf_size(cur->msg->buf) > 0) {
buf = chain->buf;
*buf = *cur->msg->buf;
if(buf->file) {
ngx_file_t *file_copy = nchan_bufchain_pool_reserve_file(ctx->bcp);
nchan_msg_buf_open_fd_if_needed(buf, file_copy, NULL);
}
buf->last_buf = 0;
size += ngx_buf_size(buf);
}
if(use_raw_stream_separator) {
chain = chain->next;
ngx_init_set_membuf_str(chain->buf, &cf->subscriber_http_raw_stream_separator);
size += ngx_buf_size((chain->buf));
}
else {
if(cur->next == NULL) {
chain = chain->next;
chain->buf = &boundary[2];
size += ngx_buf_size((chain->buf));
}
}
last_chain = chain;
}
buf = last_chain->buf;
buf->last_buf = 1;
buf->last_in_chain = 1;
buf->flush = 1;
last_chain->next = NULL;
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = size;
nchan_set_msgid_http_response_headers(r, ctx, &fsub->data.multimsg_last->msg->id);
nchan_include_access_control_if_needed(r, ctx);
ngx_http_send_header(r);
nchan_output_filter(r, first_chain);
return NGX_OK;
}
subscriber_t *http_multipart_subscriber_create(ngx_http_request_t *r, nchan_msg_id_t *msg_id) {
subscriber_t *sub = longpoll_subscriber_create(r, msg_id);
full_subscriber_t *fsub = (full_subscriber_t *)sub;
multipart_privdata_t *multipart_data;
nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(fsub->sub.request, nchan_module);
if(multipart_fn == NULL) {
multipart_fn = &multipart_fn_data;
*multipart_fn = *sub->fn;
multipart_fn->enqueue = multipart_enqueue;
multipart_fn->respond_message = multipart_respond_message;
multipart_fn->respond_status = multipart_respond_status;
}
fsub->data.shook_hands = 0;
fsub->privdata = ngx_palloc(sub->request->pool, sizeof(multipart_privdata_t));
multipart_data = (multipart_privdata_t *)fsub->privdata;
multipart_data->boundary_end = ngx_snprintf(multipart_data->boundary, 50, "\r\n--%V", nchan_request_multipart_boundary(fsub->sub.request, ctx));
//header bufs -- unique per response
ctx->output_str_queue = ngx_palloc(r->pool, sizeof(*ctx->output_str_queue));
nchan_reuse_queue_init(ctx->output_str_queue, offsetof(headerbuf_t, prev), offsetof(headerbuf_t, next), headerbuf_alloc, NULL, sub->request->pool);
ctx->bcp = ngx_palloc(r->pool, sizeof(nchan_bufchain_pool_t));
nchan_bufchain_pool_init(ctx->bcp, r->pool);
nchan_subscriber_common_setup(sub, HTTP_MULTIPART, &sub_name, multipart_fn, 0);
return sub;
}
static ngx_int_t longpoll_multipart_respond(full_subscriber_t *fsub) {
ngx_http_request_t *r = fsub->sub.request;
nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(r, nchan_module);
char *err;
ngx_int_t rc;
u_char char_boundary[50];
u_char *char_boundary_last;
ngx_int_t i;
ngx_buf_t boundary[3]; //first, mid, and last boundary
ngx_chain_t *chains, *first_chain = NULL, *last_chain = NULL;
ngx_buf_t *buf;
ngx_buf_t double_newline_buf;
ngx_str_t *content_type;
size_t size = 0;
nchan_longpoll_multimsg_t *first, *cur;
//disable abort handler
fsub->data.cln->handler = empty_handler;
first = fsub->data.multimsg_first;
fsub->sub.dequeue_after_response = 1;
//cleanup to release msgs
fsub->data.cln = ngx_http_cleanup_add(fsub->sub.request, 0);
fsub->data.cln->data = first;
fsub->data.cln->handler = (ngx_http_cleanup_pt )multipart_request_cleanup_handler;
if(fsub->data.multimsg_first == fsub->data.multimsg_last) {
//just one message.
if((rc = nchan_respond_msg(r, fsub->data.multimsg_first->msg, &fsub->sub.last_msgid, 0, &err)) != NGX_OK) {
return abort_response(&fsub->sub, err);
}
return NGX_OK;
}
//multi messages
nchan_request_set_content_type_multipart_boundary_header(r, ctx);
char_boundary_last = ngx_snprintf(char_boundary, 50, ("\r\n--%V--\r\n"), nchan_request_multipart_boundary(r, ctx));
ngx_memzero(&double_newline_buf, sizeof(double_newline_buf));
double_newline_buf.start = (u_char *)"\r\n\r\n";
double_newline_buf.end = double_newline_buf.start + 4;
double_newline_buf.pos = double_newline_buf.start;
double_newline_buf.last = double_newline_buf.end;
double_newline_buf.memory = 1;
//set up the boundaries
for(i=0; i<3; i++) {
ngx_memzero(&boundary[i], sizeof(ngx_buf_t));
boundary[i].memory = 1;
if(i==0) {
boundary[i].start = &char_boundary[2];
boundary[i].end = &char_boundary_last[-4];
}
else if(i==1) {
boundary[i].start = &char_boundary[0];
boundary[i].end = &char_boundary_last[-4];
}
else if(i==2) {
boundary[i].start = &char_boundary[0];
boundary[i].end = char_boundary_last;
boundary[i].last_buf = 1;
boundary[i].last_in_chain = 1;
boundary[i].flush = 1;
}
boundary[i].pos = boundary[i].start;
boundary[i].last = boundary[i].end;
}
int n=0;
for(cur = first; cur != NULL; cur = cur->next) {
chains = ngx_palloc(r->pool, sizeof(*chains)*4);
n++;
if(last_chain) {
last_chain->next = &chains[0];
}
if(!first_chain) {
first_chain = &chains[0];
}
// each buffer needs to be unique for the purpose of dealing with nginx output guts
// (something about max. 64 iovecs per write call and counting the number of bytes already sent)
buf = ngx_pcalloc(r->pool, sizeof(*buf));
*buf = cur == first ? boundary[0] : boundary[1];
chains[0].buf = buf;
chains[0].next = &chains[1];
size += ngx_buf_size(chains[0].buf);
content_type = &cur->msg->content_type;
if (content_type->data != NULL) {
buf = ngx_pcalloc(r->pool, sizeof(*buf) + content_type->len + 25);
buf->memory = 1;
buf->start = (u_char *)&buf[1];
buf->end = ngx_snprintf(buf->start, content_type->len + 25, "\r\nContent-Type: %V\r\n\r\n", content_type);
buf->pos = buf->start;
buf->last = buf->end;
chains[1].buf = buf;
}
else {
buf = ngx_palloc(r->pool, sizeof(*buf));
chains[1].buf = buf;
*buf = double_newline_buf;
}
size += ngx_buf_size(chains[1].buf);
if(ngx_buf_size(cur->msg->buf) > 0) {
chains[1].next = &chains[2];
buf = ngx_palloc(r->pool, sizeof(*buf));
*buf = *cur->msg->buf;
nchan_msg_buf_open_fd_if_needed(buf, NULL, r);
buf->last_buf = 0;
chains[2].buf = buf;
size += ngx_buf_size(chains[2].buf);
last_chain = &chains[2];
}
else {
last_chain = &chains[1];
}
if(cur->next == NULL) {
last_chain->next = &chains[3];
chains[3].buf = &boundary[2];
chains[3].next = NULL;
last_chain = &chains[3];
size += ngx_buf_size(chains[3].buf);
}
}
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = size;
nchan_set_msgid_http_response_headers(r, ctx, &fsub->data.multimsg_last->msg->id);
nchan_include_access_control_if_needed(r, ctx);
ngx_http_send_header(r);
nchan_output_filter(r, first_chain);
return NGX_OK;
}
