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Commit3824b90

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committed
Add SocketHUB library
1 parent0f1b88d commit3824b90

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3 files changed

+441
-0
lines changed

3 files changed

+441
-0
lines changed

‎contrib/pg_xtm/sockhub.c‎

Lines changed: 333 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,333 @@
1+
#include<sys/ioctl.h>
2+
#include<fcntl.h>
3+
#include<sys/time.h>
4+
#include<sys/types.h>
5+
#include<sys/socket.h>
6+
#include<sys/utsname.h>
7+
#include<sys/select.h>
8+
#include<netinet/in.h>
9+
#include<netinet/tcp.h>
10+
#include<arpa/inet.h>
11+
#include<stdio.h>
12+
#include<netdb.h>
13+
#include<stdlib.h>
14+
#include<unistd.h>
15+
#include<string.h>
16+
#include<errno.h>
17+
18+
staticvoiddefault_error_handler(charconst*msg,ShubErrorSeverityseverity)
19+
{
20+
perror(msg);
21+
if (severity==SHUB_FATAL_ERROR) {
22+
exit(1);
23+
}
24+
}
25+
26+
27+
voidShubInitPrams(ShubParams*params)
28+
{
29+
memset(params,0,sizeofparams);
30+
params->buffer_size=64*1025;
31+
params->port=54321;
32+
params->queue_size=100;
33+
params->max_attempts=10;
34+
params->error_handler=default_error_handler;
35+
}
36+
37+
38+
staticintresolve_host_by_name(constchar*hostname,unsigned*addrs,unsigned*n_addrs)
39+
{
40+
structsockaddr_insin;
41+
structhostent*hp;
42+
unsignedi;
43+
44+
sin.sin_addr.s_addr=inet_addr(hostname);
45+
if (sin.sin_addr.s_addr!=INADDR_NONE) {
46+
memcpy(&addrs[0],&sin.sin_addr.s_addr,sizeof(sin.sin_addr.s_addr));
47+
*n_addrs=1;
48+
return1;
49+
}
50+
51+
hp=gethostbyname(hostname);
52+
if (hp==NULL||hp->h_addrtype!=AF_INET) {
53+
return0;
54+
}
55+
for (i=0;hp->h_addr_list[i]!=NULL&&i<*n_addrs;i++) {
56+
memcpy(&addrs[i],hp->h_addr_list[i],sizeof(addrs[i]));
57+
}
58+
*n_addrs=i;
59+
return1;
60+
}
61+
62+
63+
64+
staticvoidclose_socket(Shub*shub,intfd)
65+
{
66+
inti,max_fd;
67+
fd_setcopy;
68+
FD_ZERO(&copy);
69+
close(fd);
70+
for (i=0,max_fd=shub->max_fd;i <=max_fd;i++) {
71+
if (i!=fd&&FD_ISSET(i,&shub->inset)) {
72+
FD_SET(i,&copy);
73+
}
74+
}
75+
FD_COPY(&copy,&shub->inset);
76+
}
77+
78+
staticintread_socket(intsd,char*buf,intsize)
79+
{
80+
while (size!=0) {
81+
intn=recv(sd,buf,size ,0);
82+
if (n <=0) {
83+
return0;
84+
}
85+
size-=n;
86+
buf+=n;
87+
}
88+
return1;
89+
}
90+
91+
staticintwrite_socket(intsd,charconst*buf,intsize)
92+
{
93+
while (size!=0) {
94+
intn=send(sd,buf,size,0);
95+
if (n <=0) {
96+
return0;
97+
}
98+
size-=n;
99+
buf+=n;
100+
}
101+
return1;
102+
}
103+
104+
105+
staticvoidreconnect(Shub*shub)
106+
{
107+
structsockaddr_insock_inet;
108+
unsignedaddrs[128];
109+
unsignedi,n_addrs=sizeof(addrs) /sizeof(addrs[0]);
110+
intmax_attemtps=shub->params->max_attempts;
111+
112+
if (shub->output >=0) {
113+
close_socket(shub,shub->output);
114+
}
115+
116+
sock_inet.sin_family=AF_INET;
117+
sock_inet.sin_port=htons(port);
118+
if (!resolve_host_by_name(host,addrs,&n_addrs)) {
119+
shub->error_handler("Failed to resolve host by name",SHUB_FATAL_ERROR);
120+
}
121+
shub->output=socket(AF_INET,SOCK_STREAM,0);
122+
if (shub->output<0) {
123+
shub->error_handler("Failed to create inet socket",SHUB_FATAL_ERROR);
124+
}
125+
while (1) {
126+
intrc=-1;
127+
for (i=0;i<n_addrs;++i) {
128+
memcpy(&sock_inet.sin_addr,&addrs[i],sizeofsock_inet.sin_addr);
129+
do {
130+
rc=connect(output, (structsockaddr*)&sock_inet,sizeof(sock_inet));
131+
}while (rc<0&&errno==EINTR);
132+
133+
if (rc >=0||errno==EINPROGRESS) {
134+
if (rc >=0) {
135+
}
136+
break;
137+
}
138+
}
139+
if (rc<0) {
140+
if (errno!=ENOENT&&errno!=ECONNREFUSED) {
141+
shub->error_handler("Connection can not be establish",SHUB_FATAL_ERROR);
142+
}
143+
if (max_attempts--!=0) {
144+
sleep(1);
145+
}else {
146+
shub->error_handler("Failed to connect to host",SHUB_FATAL_ERROR);
147+
}
148+
}else {
149+
intoptval=1;
150+
setsockopt(shub->output,IPPROTO_TCP,TCP_NODELAY, (charconst*)&optval,sizeof(int));
151+
FD_SET(shub->output,&inset);
152+
break;
153+
}
154+
}
155+
}
156+
157+
staticvoidrecovery(Shub*shub)
158+
{
159+
inti,max_fd;
160+
fd_setokset;
161+
fd_settryset;
162+
163+
for (i=0,max_fd=shub->max_fd;i <=max_fd;i++) {
164+
if (FD_ISSET(i,&inset)) {
165+
structtimevaltm= {0,0};
166+
FD_ZERO(&tryset);
167+
FD_SET(i,&tryset);
168+
if (select(i+1,&tryset,NULL,NULL,&tm) >=0) {
169+
FD_SET(i,&okset);
170+
}
171+
}
172+
}
173+
FD_COPY(&okset,&shub->inset);
174+
}
175+
176+
voidShubIntialize(Shub*shub,ShubParams*params)
177+
{
178+
structsockaddrsock;
179+
180+
shub->params=params;
181+
sock.sa_family=AF_UNIX;
182+
strcpy(sock.sa_data,params->file);
183+
unlink(params->file);
184+
shub->input=socket(AF_UNIX,SOCK_STREAM,0);
185+
if (shub->input<0) {
186+
shub->error_handler("Failed to create local socket",SHUB_FATAL_ERROR);
187+
}
188+
if (bind(shub->input,&sock, ((char*)sock.sa_data- (char*)&sock)+strlen(params->file))<0) {
189+
shub->error_handler("Failed to bind local socket",SHUB_FATAL_ERROR);
190+
}
191+
if (listen(shub->input,params->queue_size)<0) {
192+
shub->error_handler("Failed to listen local socket");
193+
}
194+
FD_ZERO(&shub->inset);
195+
FD_SET(shub->input,&shub->inset);
196+
197+
reconnect(shub);
198+
199+
shub->in_buffer=malloc(params->buffer_size);
200+
shub->out_buffer=malloc(params->buffer_size);
201+
if (shub->in_buffer==NULL||shub->out_buffer==NULL) {
202+
shub->error_handler("Failed to allocate buffer",SHUB_FATAL_ERROR);
203+
}
204+
}
205+
206+
207+
voidShubLoop(Shub*shub)
208+
{
209+
intbuffer_size=shub->params->buffer_size;
210+
211+
while (1) {
212+
fd_setevents;
213+
structtimevaltm;
214+
inti,max_fd,rc;
215+
unsignedintn,size;
216+
217+
tm.tv_sec=delay/1000;
218+
tm.tv_usec=delay %1000*1000;
219+
220+
221+
FD_COPY(&shub->inset,&events);
222+
rc=select(shub->max_fd+1,&events,NULL,NULL,shub->in_buffer_used==0 ?NULL :&tm);
223+
if (rc<0) {
224+
if (errno!=EINTR) {
225+
shub->error_handler("Select failed",SHUB_RECOVERABLE_ERROR);
226+
recovery(shub);
227+
}
228+
}else {
229+
if (rc>0) {
230+
for (i=0,max_fd=shub->max_fd;i <=max_fd;i++) {
231+
if (FD_ISSET(i,&events)) {
232+
if (i==shub->input) {
233+
ints=accept(i,NULL,NULL);
234+
if (s<0) {
235+
shub->error_handler("Failed to accept socket",SHUB_RECOVERABLE_ERROR);
236+
}else {
237+
if (s>max_fd) {
238+
shub->max_fd=s;
239+
}
240+
FD_SET(s,&shub->inset);
241+
}
242+
}elseif (i==shub->output) {
243+
intavailable=recv(shub->output,shub->out_buffer+shub->out_buffer_used,buffer_size-shub->out_buffer_used,0);
244+
intpos=0;
245+
if (available <=0) {
246+
pshub->error_handler("Failed to read inet socket",SHUB_RECOVERABLE_ERROR);
247+
reconnect(shub);
248+
}
249+
shub->out_buffer_used+=available;
250+
while (pos+sizeof(ShubMessageHdr) <=shub->out_buffer_used) {
251+
ShubMessageHdr*hdr= (ShubMessageHdr*)shub->out_buffer;
252+
intchan=hdr->chan;
253+
pos+=sizeof(ShubMessageHdr);
254+
n=pos+hdr->size <=shub->out_buffer_used ?hdr->size+sizeof(ShubMessageHdr) :shub->out_buffer_used-pos;
255+
if (!write_socket(chan,hdr,n)) {
256+
shub->error_handler("Failed to write to local socket",SHUB_RECOVERABLE_ERROR);
257+
close_socket(shub,chan);
258+
chan=-1;
259+
}
260+
if (n!=hdr->size+sizeof(ShubMessageHdr)) {
261+
inttail=hdr->size+sizeof(ShubMessageHdr)-n;
262+
do {
263+
n=tail<shub->out_buffer_size ?tail :shub->out_buffer_size;
264+
if (!read_socket(output,out_buffer,n)) {
265+
shub->error_handler("Failed to read inet socket",SHUB_RECOVERABLE_ERROR);
266+
reconnect(shub);
267+
continue;
268+
}
269+
if (chan >=0&& !write_socket(chan,out_buffer,n)) {
270+
shub->error_handler("Failed to write to local socket",SHUB_RECOVERABLE_ERROR);
271+
close_socket(shub,chan);
272+
chan=-1;
273+
}
274+
tail-=n;
275+
}while (tail!=0);
276+
}
277+
}
278+
memcpy(shub->out_buffer,shub->out_buffer+pos,shub->out_buffer_used-pos);
279+
shub->out_buffer_used-=pos;
280+
}else {
281+
ShubMessageHdr*hdr= (MessgeHdr*)&shub->in_buffer[shub->in_buffer_used];
282+
if (!read_socket(i,hdr,sizeof(ShubMessageHdr))) {
283+
shub->error_handler("Failed to read local socket",SHUB_RECOVERABLE_ERROR);
284+
close_socket(shub,i);
285+
}else {
286+
unsignedintsize=hdr->size;
287+
hdr->chan=i;
288+
if (size+shub->in_buffer_used+sizeof(ShubMessageHdr)>buffer_size) {
289+
if (shub->in_buffer_used!=0) {
290+
while (!write_socket(shub->output,shub->in_buffer,shub->in_buffer_used)) {
291+
shub->error_handler("Failed to write to inet socket",SHUB_RECOVERABLE_ERROR);
292+
reconnect(shub);
293+
}
294+
memcpy(shub->in_buffer,shub->in_buffer+shub->in_buffer_used,sizeof(ShubMessageHdr));
295+
shub->in_buffer_used=0;
296+
}
297+
}
298+
shub->in_buffer_used+=sizeof(ShubMessageHdr);
299+
300+
while (1) {
301+
unsignedintn=size+shub->in_buffer_used>buffer_size ?buffer_size-shub->in_buffer_used :size;
302+
if (!read_socket(i,shub->in_buffer+shub->in_buffer_used,n)) {
303+
shub->error_handler("Failed to read local socket",SHUB_RECOVERABLE_ERROR);
304+
close_socket(shub,i);
305+
break;
306+
}else {
307+
if (n!=size) {
308+
while (!write_socket(output,in_buffer,n)) {
309+
shub->error_handler("Failed to write to inet socket",SHUB_RECOVERABLE_ERROR);
310+
reconnect(shub);
311+
}
312+
size-=n;
313+
shub->in_buffer_used=0;
314+
}else {
315+
shub->in_buffer_used+=n;
316+
break;
317+
}
318+
}
319+
}
320+
}
321+
}
322+
}
323+
}
324+
}elseif (shub->in_buffer_used!=0) {
325+
while (!write_socket(shub->output,shub->in_buffer,shub->in_buffer_used)) {
326+
shub->error_handler("Failed to write to inet socket",SHUB_RECOVERABLE_ERROR);
327+
reconnect(shub);
328+
}
329+
}
330+
}
331+
}
332+
}
333+

‎contrib/pg_xtm/sockhub.h‎

Lines changed: 50 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,50 @@
1+
#ifndef__SOCKHUB_H__
2+
#define__SOCKHUB_H__
3+
4+
#include<sys/select.h>
5+
6+
typedefstruct {
7+
unsignedintsize :24;/* size of message without header */
8+
unsignedintcode :8;/* any user defined code */
9+
unsignedintchan;/* local socket: set by SockHUB */
10+
}ShubMessageHdr;
11+
12+
typedefenum
13+
{
14+
SHUB_FATAL_ERROR,
15+
SHUB_RECOVERABLE_ERROR,
16+
SHUB_MINOR_ERROR,
17+
}ShubErrorSeverity;
18+
19+
typedefvoid(*ShubErrorHandler)(charconst*msg,ShubErrorSeverityseverity);
20+
21+
typedefstruct
22+
{
23+
intbuffer_size;
24+
intdelay;
25+
intport;
26+
intqueue_size;
27+
intmax_attempts;
28+
charconst*file;
29+
charconst*host;
30+
ShubErrorHandlererror_handler;
31+
}ShubParms;
32+
33+
typedefstruct
34+
{
35+
intoutput;
36+
intinput;
37+
intmax_fd;
38+
fd_setinset;
39+
char*in_buffer;
40+
intin_buffer_used;
41+
char*out_buffer;
42+
intout_buffer_used;
43+
ShubParams*params;
44+
}Shub;
45+
46+
voidShubInitParams(ShubParams*params);
47+
voidShubIntialize(Shub*shub,ShubParams*params);
48+
voidShubLoop(Shub*shub);
49+
50+
#endif

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