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CCD_Capture/client.c

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/*
* This file is part of the CCD_Capture project.
* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// client-side functions
#include <stdatomic.h>
#include <math.h> // isnan
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <usefull_macros.h>
#include "client.h"
#include "cmdlnopts.h"
#include "server.h" // for common commands names
#include "socket.h"
static char sendbuf[BUFSIZ];
#define SENDMSG(...) do{snprintf(sendbuf, BUFSIZ-1, __VA_ARGS__); verbose(2, "\t> %s", sendbuf); sendstrmessage(sock, sendbuf); getans(sock);}while(0)
static volatile atomic_int expstate = CAMERA_CAPTURE;
static int xm0,ym0,xm1,ym1; // max format
#ifdef IMAGEVIEW
static IMG ima = {0};
static volatile atomic_int grabends = 0;
static int imdatalen = 0, imbufsz = 0;
#endif
/**
* check data from fd (polling function for client)
* @param fd - file descriptor
* @return 0 in case of timeout, 1 in case of fd have data, -1 if error
*/
static int canberead(int fd){
fd_set fds;
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 100;
FD_ZERO(&fds);
FD_SET(fd, &fds);
do{
int rc = select(fd+1, &fds, NULL, NULL, &timeout);
if(rc < 0){
if(errno != EINTR){
LOGWARN("select()");
WARN("select()");
return -1;
}
continue;
}
break;
}while(1);
if(FD_ISSET(fd, &fds)){
return 1;
}
return 0;
}
static char *readmsg(int fd){
static char buf[BUFSIZ] = {0}, line[BUFSIZ];
int curlen = strlen(buf);
if(curlen == BUFSIZ-1) curlen = 0; // buffer overflow - clear old content
ssize_t rd = 0;
if(1 == canberead(fd)){
rd = read(fd, buf + curlen, BUFSIZ-1 - curlen);
if(rd <= 0){
WARNX("Server disconnected");
signals(1);
}
}
curlen += rd;
buf[curlen] = 0;
if(curlen == 0) return NULL;
//DBG("cur buffer: ----%s----", buf);
char *nl = strchr(buf, '\n');
if(!nl) return NULL;
*nl++ = 0;
strcpy(line, buf);
int rest = curlen - (int)(nl-buf);
if(rest > 0) memmove(buf, nl, rest+1);
else *buf = 0;
return line;
}
// parser of CCD server messages; return TRUE to exit from polling cycle of `getans` (if receive 'FAIL', 'OK' or 'BUSY')
static int parseans(char *ans){
if(!ans) return FALSE;
//DBG("Parsing of '%s'", ans);
if(0 == strcmp(hresult2str(RESULT_BUSY), ans)) ERRX("Server busy");
if(0 == strcmp(hresult2str(RESULT_FAIL), ans)) return TRUE;
if(0 == strcmp(hresult2str(RESULT_OK), ans)) return TRUE;
char *val = get_keyval(ans); // now `ans` is a key and `val` its value
if(0 == strcmp(CMD_EXPSTATE, ans)){
expstate = atoi(val);
DBG("Exposition state: %d", expstate);
}else if(0 == strcmp(CMD_FRAMEMAX, ans)){
sscanf(val, "%d,%d,%d,%d", &xm0, &ym0, &xm1, &ym1);
DBG("Got maxformat: %d,%d,%d,%d", xm0, ym0, xm1, ym1);
}
#ifdef IMAGEVIEW
else if(0 == strcmp(CMD_IMWIDTH, ans)){
ima.w = atoi(val);
DBG("Get width: %d", ima.w);
imdatalen = ima.w * ima.h * 2;
}else if(0 == strcmp(CMD_IMHEIGHT, ans)){
ima.h = atoi(val);
DBG("Get height: %d", ima.h);
imdatalen = ima.w * ima.h * 2;
}
#endif
return FALSE;
}
// read until timeout all messages from server; return FALSE if there was no messages from server
static int getans(int sock){
double t0 = dtime();
char *ans = NULL;
while(dtime() - t0 < ANSWER_TIMEOUT){
char *s = readmsg(sock);
if(!s){ // buffer is empty, return last message or wait for it
if(ans) return TRUE;
else continue;
}
t0 = dtime();
ans = s;
DBG("Got from server: %s", ans);
verbose(1, "\t%s", ans);
if(parseans(ans)) break;
}
DBG("GETANS: timeout, ans: %s", ans);
return ((ans) ? TRUE : FALSE);
}
/**
* @brief processData - process here some actions and make messages for server
*/
static void send_headers(int sock){
// common information
SENDMSG(CMD_INFO);
// focuser
if(GP->listdevices) SENDMSG(CMD_FOCLIST);
if(GP->focdevno > -1) SENDMSG(CMD_FDEVNO "=%d", GP->focdevno);
if(!isnan(GP->gotopos)){
SENDMSG(CMD_FGOTO "=%g", GP->gotopos);
}
// wheel
if(GP->listdevices) SENDMSG(CMD_WLIST);
if(GP->whldevno > -1) SENDMSG(CMD_WDEVNO "=%d", GP->whldevno);
if(GP->setwheel > -1) SENDMSG(CMD_WPOS "=%d", GP->setwheel);
DBG("nxt");
// CCD/CMOS
if(GP->X0 > -1 || GP->Y0 > -1 || GP->X1 > -1 || GP->Y1 > -1){ // set format
SENDMSG(CMD_FRAMEMAX);
DBG("max format: (%d,%d)x(%d,%d)", xm0,ym0,xm1,ym1);
if(GP->X0 < 0) GP->X0 = xm0; // default values
else if(GP->X0 > xm1-1) GP->X0 = xm1-1;
if(GP->Y0 < 0) GP->Y0 = ym0;
else if(GP->Y0 > ym1-1) GP->Y0 = ym1-1;
if(GP->X1 < GP->X0+1 || GP->X1 > xm1) GP->X1 = xm1;
if(GP->Y1 < GP->Y0+1 || GP->Y1 > ym1) GP->Y1 = ym1;
DBG("set format: (%d,%d)x(%d,%d)", GP->X0,GP->X1,GP->Y0,GP->Y1);
SENDMSG(CMD_FRAMEFORMAT "=%d,%d,%d,%d", GP->X0, GP->Y0, GP->X1, GP->Y1);
}
if(GP->cancelexpose) SENDMSG(CMD_EXPSTATE "=%d", CAMERA_IDLE);
if(GP->listdevices) SENDMSG(CMD_CAMLIST);
if(GP->camdevno > -1) SENDMSG(CMD_CAMDEVNO "=%d", GP->camdevno);
if(GP->hbin) SENDMSG(CMD_HBIN "=%d", GP->hbin);
if(GP->vbin) SENDMSG(CMD_VBIN "=%d", GP->vbin);
if(!isnan(GP->temperature)) SENDMSG(CMD_CAMTEMPER "=%g", GP->temperature);
if(GP->shtr_cmd > -1) SENDMSG(CMD_SHUTTER "=%d", GP->shtr_cmd);
if(GP->confio > -1) SENDMSG(CMD_CONFIO "=%d", GP->confio);
if(GP->setio > -1) SENDMSG(CMD_IO "=%d", GP->setio);\
if(!isnan(GP->gain)) SENDMSG(CMD_GAIN "=%g", GP->gain);
if(!isnan(GP->brightness)) SENDMSG(CMD_BRIGHTNESS "=%g", GP->brightness);
if(GP->nflushes > 0) SENDMSG(CMD_NFLUSHES "=%d", GP->nflushes);
if(GP->outfile || GP->outfileprefix){ // exposition and reading control: only if start of exposition
if(GP->_8bit) SENDMSG(CMD_8BIT "=1");
else SENDMSG(CMD_8BIT "=0");
if(GP->fast) SENDMSG(CMD_FASTSPD "=1");
else SENDMSG(CMD_FASTSPD "=0");
if(GP->dark) SENDMSG(CMD_DARK "=1");
else SENDMSG(CMD_DARK "=0");
}
if(GP->outfile){
if(!*GP->outfile) SENDMSG(CMD_FILENAME "=");
else SENDMSG(CMD_FILENAME "=%s", makeabspath(GP->outfile, FALSE));
if(GP->rewrite) SENDMSG(CMD_REWRITE "=1");
else SENDMSG(CMD_REWRITE "=0");
}
if(GP->outfileprefix){
if(!*GP->outfileprefix) SENDMSG(CMD_FILENAMEPREFIX "=");
else SENDMSG(CMD_FILENAMEPREFIX "=%s", makeabspath(GP->outfileprefix, FALSE));
}
if(GP->exptime > -DBL_EPSILON) SENDMSG(CMD_EXPOSITION "=%g", GP->exptime);
// FITS header keywords:
#define CHKHDR(x, cmd) do{if(x) SENDMSG(cmd "=%s", x);}while(0)
CHKHDR(GP->author, CMD_AUTHOR);
CHKHDR(GP->instrument, CMD_INSTRUMENT);
CHKHDR(GP->observers, CMD_OBSERVER);
CHKHDR(GP->objname, CMD_OBJECT);
CHKHDR(GP->prog_id, CMD_PROGRAM);
CHKHDR(GP->objtype, CMD_OBJTYPE);
#undef CHKHDR
if(GP->addhdr){
char buf[1024], *ptr = buf, **sptr = GP->addhdr;
*buf = 0;
int L = 1024;
while(*sptr){
if(!**sptr){
++sptr; continue;
}
int N = snprintf(ptr, L-1, "%s,", *sptr++);
L -= N; ptr += N;
}
SENDMSG(CMD_HEADERFILES "=%s", buf);
}
}
void client(int sock){
if(GP->restart){
SENDMSG(CMD_RESTART);
return;
}
send_headers(sock);
double t0 = dtime(), tw = t0;
int Nremain = 0, nframe = 1;
// if client gives filename/prefix or Nframes, make exposition
if((GP->outfile && *GP->outfile) || (GP->outfileprefix && *GP->outfileprefix) || GP->nframes > 0){
Nremain = GP->nframes - 1;
if(Nremain < 1) Nremain = 0;
else GP->waitexpend = TRUE; // N>1 - wait for exp ends
SENDMSG(CMD_EXPSTATE "=%d", CAMERA_CAPTURE);
}else{
while(getans(sock));
DBG("RETURN: no more data");
return;
}
double timeout = GP->waitexpend ? CLIENT_TIMEOUT : WAIT_TIMEOUT;
verbose(1, "Exposing frame 1...");
if(GP->waitexpend){
expstate = CAMERA_CAPTURE; // could be changed earlier
verbose(2, "Wait for exposition end");
}
while(dtime() - t0 < timeout){
if(GP->waitexpend && dtime() - tw > WAIT_TIMEOUT){
SENDMSG(CMD_TREMAIN); // get remained time
tw = dtime();
sprintf(sendbuf, "%s", CMD_EXPSTATE);
sendstrmessage(sock, sendbuf);
}
if(getans(sock)){ // got next portion of data
DBG("server message");
t0 = dtime();
if(expstate == CAMERA_ERROR){
WARNX(_("Can't make exposition"));
return;
}
if(expstate != CAMERA_CAPTURE){
verbose(2, "Frame ready!");
if(Nremain){
verbose(1, "\n");
if(GP->pause_len > 0){
double delta, time1 = dtime() + GP->pause_len;
while(1){
SENDMSG(CMD_CAMTEMPER);
if((delta = time1 - dtime()) < __FLT_EPSILON__) break;
// %d <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>\n
if(delta > 1.) verbose(1, _("%d seconds till pause ends\n"), (int)delta);
if(delta > 6.) sleep(5);
else if(delta > 1.) sleep((int)delta);
else usleep((int)(delta*1e6 + 1));
}
}
verbose(1, "Exposing frame %d...", ++nframe);
--Nremain;
SENDMSG(CMD_EXPSTATE "=%d", CAMERA_CAPTURE);
}else{
GP->waitexpend = 0;
timeout = WAIT_TIMEOUT; // wait for last file name
}
}
}
}
if(GP->waitexpend) WARNX(_("Server timeout"));
DBG("Timeout");
}
#ifdef IMAGEVIEW
static int grabsockfd = -1;
void init_grab_sock(int sock){
grabsockfd = sock;
send_headers(sock);
}
static void *grabnext(void _U_ *arg){ // daemon grabbing images through the net
FNAME();
if(grabsockfd < 0) return NULL;
int sock = grabsockfd;
while(1){
while(grabends); // wait until image processed
SENDMSG(CMD_IMWIDTH);
SENDMSG(CMD_IMHEIGHT);
expstate = CAMERA_CAPTURE;
SENDMSG(CMD_EXPSTATE "=%d", CAMERA_CAPTURE); // start capture
double timeout = GP->exptime + CLIENT_TIMEOUT, t0 = dtime();
while(dtime() - t0 < timeout){
SENDMSG(CMD_EXPSTATE);
if(expstate != CAMERA_CAPTURE) break;
}
if(dtime() - t0 >= timeout || expstate != CAMERA_FRAMERDY){
WARNX("Image wasn't received");
continue;
}
DBG("Frame ready");
sendstrmessage(sock, CMD_GETIMAGE);
if(imbufsz < imdatalen){
DBG("Reallocate memory from %d to %d", imbufsz, imdatalen);
ima.data = realloc(ima.data, imdatalen);
imbufsz = imdatalen;
}
t0 = dtime();
int got = 0;
while(dtime() - t0 < CLIENT_TIMEOUT){
if(!canberead(sock)) continue;
int rd = read(sock, ((uint8_t*)ima.data)+got, imdatalen - got);
if(rd <= 0){
WARNX("Server disconnected");
signals(1);
}
got += rd;
DBG("Read %d bytes; total read %d from %d", rd, got, imdatalen);
if(got == imdatalen){
DBG("Got image");
grabends = 1;
break;
}
}
if(dtime() - t0 > CLIENT_TIMEOUT) WARNX("Timeout, image didn't received");
}
return NULL;
}
// try to capture images through socket
int sockcaptured(IMG **imgptr){
if(!imgptr) return FALSE;
static pthread_t grabthread = 0;
if(grabsockfd < 0) return FALSE;
if(imgptr == (void*)-1){ // kill `grabnext`
DBG("Kill grabbing thread");
if(grabthread){
pthread_cancel(grabthread);
pthread_join(grabthread, NULL);
grabthread = 0;
}
DBG("Killed");
return FALSE;
}
if(!grabthread){ // start new grab
DBG("\n\n\nStart new grab");
if(pthread_create(&grabthread, NULL, &grabnext, NULL)){
WARN("Can't create grabbing thread");
grabthread = 0;
}
}else{ // grab in process
if(grabends){ // image is ready
DBG("Image ready");
if(*imgptr && (*imgptr != &ima)) free(*imgptr);
*imgptr = &ima;
grabends = 0;
return TRUE;
}
}
return FALSE;
}
// IMAGEVIEW
#endif
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