3 /* buf trp (transport) - buffered transport using the TCP one */
5 /* Copyright (c) 2004 Martin Quinson. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #include <string.h> /* memset */
15 #include "xbt/sysdep.h"
17 #include "transport_private.h"
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(trp_buf,transport,
20 "Generic buffered transport (works on top of TCP or SG)");
23 static gras_trp_plugin_t _buf_super;
28 void hexa_print(const char*name, unsigned char *data, int size); /* in gras.c */
30 void gras_trp_buf_socket_client(gras_trp_plugin_t self,
32 void gras_trp_buf_socket_server(gras_trp_plugin_t self,
34 gras_socket_t gras_trp_buf_socket_accept(gras_socket_t sock);
36 void gras_trp_buf_socket_close(gras_socket_t sd);
38 void gras_trp_buf_chunk_send(gras_socket_t sd,
40 unsigned long int size);
42 void gras_trp_buf_chunk_recv(gras_socket_t sd,
44 unsigned long int size);
45 void gras_trp_buf_flush(gras_socket_t sock);
49 *** Specific plugin part
54 } gras_trp_buf_plug_data_t;
57 *** Specific socket part
63 int pos; /* for receive; not exchanged over the net */
66 struct gras_trp_bufdata_{
72 void gras_trp_buf_init_sock(gras_socket_t sock) {
73 gras_trp_bufdata_t *data=xbt_new(gras_trp_bufdata_t,1);
76 data->buffsize = 100 * 1024 ; /* 100k */
79 data->in.data = xbt_malloc(data->buffsize);
80 data->in.pos = 0; /* useless, indeed, since size==pos */
82 /* In SG, the 4 first bytes are for the chunk size as htonl'ed, so that we can send it in one shoot.
83 * This is mandatory in SG because all emissions go to the same channel, so if we split them,
84 * they can get mixed. */
85 data->out.size = gras_if_RL()?0:4;
86 data->out.data = xbt_malloc(data->buffsize);
87 data->out.pos = data->out.size;
96 gras_trp_buf_setup(gras_trp_plugin_t plug) {
97 gras_trp_buf_plug_data_t *data =xbt_new(gras_trp_buf_plug_data_t,1);
100 _buf_super = gras_trp_plugin_get_by_name(gras_if_RL() ? "tcp" : "sg");
102 DEBUG1("Derivate a buffer plugin from %s",gras_if_RL() ? "tcp" : "sg");
104 plug->socket_client = gras_trp_buf_socket_client;
105 plug->socket_server = gras_trp_buf_socket_server;
106 plug->socket_accept = gras_trp_buf_socket_accept;
107 plug->socket_close = gras_trp_buf_socket_close;
109 plug->chunk_send = gras_trp_buf_chunk_send;
110 plug->chunk_recv = gras_trp_buf_chunk_recv;
112 plug->flush = gras_trp_buf_flush;
114 plug->data = (void*)data;
118 void gras_trp_buf_socket_client(gras_trp_plugin_t self,
119 /* OUT */ gras_socket_t sock){
122 _buf_super->socket_client(_buf_super,sock);
124 gras_trp_buf_init_sock(sock);
128 * gras_trp_buf_socket_server:
130 * Open a socket used to receive messages.
132 void gras_trp_buf_socket_server(gras_trp_plugin_t self,
133 /* OUT */ gras_socket_t sock){
136 _buf_super->socket_server(_buf_super,sock);
138 gras_trp_buf_init_sock(sock);
142 gras_trp_buf_socket_accept(gras_socket_t sock) {
147 res = _buf_super->socket_accept(sock);
148 res->plugin = sock->plugin;
149 gras_trp_buf_init_sock(res);
154 void gras_trp_buf_socket_close(gras_socket_t sock){
155 gras_trp_bufdata_t *data=sock->bufdata;
158 if (data->in.size!=data->in.pos) {
159 WARN3("Socket closed, but %d bytes were unread (size=%d,pos=%d)",
160 data->in.size - data->in.pos,data->in.size, data->in.pos);
163 if (data->out.size!=data->out.pos) {
164 DEBUG2("Flush the socket before closing (in=%d,out=%d)",data->in.size, data->out.size);
165 gras_trp_buf_flush(sock);
171 free(data->out.data);
174 _buf_super->socket_close(sock);
178 * gras_trp_buf_chunk_send:
180 * Send data on a buffered socket
183 gras_trp_buf_chunk_send(gras_socket_t sock,
185 unsigned long int size) {
187 gras_trp_bufdata_t *data=(gras_trp_bufdata_t*)sock->bufdata;
191 /* Let underneath plugin check for direction, we work even in duplex */
192 xbt_assert0(size >= 0, "Cannot send a negative amount of data");
194 while (chunk_pos < size) {
195 /* size of the chunck to receive in that shot */
196 long int thissize = min(size-chunk_pos,data->buffsize - data->out.size);
197 DEBUG5("Set the chars %d..%ld into the buffer (size=%ld, ctn='%.*s')",
199 ((int)data->out.size) + thissize -1,
200 size, chunk_pos, chunk);
202 memcpy(data->out.data + data->out.size, chunk + chunk_pos, thissize);
204 data->out.size += thissize;
205 chunk_pos += thissize;
206 DEBUG5("New pos = %d; Still to send = %ld of %ld; ctn sofar='%.*s'",
207 data->out.size,size-chunk_pos,size,(int)chunk_pos,chunk);
209 if (data->out.size == data->buffsize) /* out of space. Flush it */
210 gras_trp_buf_flush(sock);
217 * gras_trp_buf_chunk_recv:
219 * Receive data on a buffered socket.
222 gras_trp_buf_chunk_recv(gras_socket_t sock,
224 unsigned long int size) {
227 gras_trp_bufdata_t *data=sock->bufdata;
228 long int chunck_pos = 0;
230 /* Let underneath plugin check for direction, we work even in duplex */
231 xbt_assert0(sock, "Cannot recv on an NULL socket");
232 xbt_assert0(size >= 0, "Cannot receive a negative amount of data");
236 while (chunck_pos < size) {
237 /* size of the chunck to receive in that shot */
240 if (data->in.size == data->in.pos) { /* out of data. Get more */
243 DEBUG0("Recv the size");
245 _buf_super->chunk_recv(sock,(char*)&nextsize, 4);
247 RETHROW3("Unable to get the chunk size on %p (peer = %s:%d): %s",
248 sock,gras_socket_peer_name(sock),gras_socket_peer_port(sock));
250 data->in.size = (int)ntohl(nextsize);
251 VERB1("Recv the chunk (size=%d)",data->in.size);
256 _buf_super->chunk_recv(sock, data->in.data, data->in.size);
261 memcpy((char*)&nextsize,data->in.data,4);
262 data->in.size = nextsize+4;
264 VERB3("Got the chunk (size=%d+4 for the size ifself)='%.*s'",
265 data->in.size-4, data->in.size,data->in.data);
266 if (XBT_LOG_ISENABLED(trp_buf,xbt_log_priority_debug))
267 hexa_print("chunck received",data->in.data,data->in.size);
272 thissize = min(size-chunck_pos , data->in.size - data->in.pos);
273 DEBUG2("Get the chars %d..%ld out of the buffer",
275 data->in.pos + thissize - 1);
276 memcpy(chunk+chunck_pos, data->in.data + data->in.pos, thissize);
278 data->in.pos += thissize;
279 chunck_pos += thissize;
280 DEBUG5("New pos = %d; Still to receive = %ld of %ld. Ctn so far='%.*s'",
281 data->in.pos,size - chunck_pos,size,(int)chunck_pos,chunk);
288 * gras_trp_buf_flush:
290 * Make sure the data is sent
293 gras_trp_buf_flush(gras_socket_t sock) {
295 gras_trp_bufdata_t *data=sock->bufdata;
299 if (XBT_LOG_ISENABLED(trp_buf,xbt_log_priority_debug))
300 hexa_print("chunck to send ",data->out.data,data->out.size);
301 if ((data->out.size - data->out.pos) == (gras_if_RL()?0:4) ) { /* 4 first bytes=size in SG mode*/
302 DEBUG2("Nothing to flush (size=%d; pos=%d)",data->out.size,data->out.pos);
306 size = (int)data->out.size - data->out.pos;
307 DEBUG4("%s the size (=%d) to %s:%d",(gras_if_RL()?"Send":"Embeed"),data->out.size-data->out.pos,
308 gras_socket_peer_name(sock),gras_socket_peer_port(sock));
310 size = (int)htonl(size);
311 _buf_super->chunk_send(sock,(char*) &size, 4);
313 memcpy(data->out.data, &size, 4);
317 DEBUG3("Send the chunk (size=%d) to %s:%d",data->out.size,
318 gras_socket_peer_name(sock),gras_socket_peer_port(sock));
319 _buf_super->chunk_send(sock, data->out.data, data->out.size);
320 VERB1("Chunk sent (size=%d)",data->out.size);
321 if (XBT_LOG_ISENABLED(trp_buf,xbt_log_priority_debug))
322 hexa_print("chunck sent ",data->out.data,data->out.size);
323 data->out.size = gras_if_RL()?0:4;