mirror of
https://github.com/xcat2/confluent.git
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72e26caf36
The semaphore arbitrated single channel sharing was proving to be too slow. Make the communication lockless by having dedicated sockets per request.
299 lines
9.4 KiB
C
299 lines
9.4 KiB
C
#include <asm-generic/socket.h>
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <locale.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/epoll.h>
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#include <sys/un.h>
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#include <fcntl.h>
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#include "tmt.h"
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#define HASHSIZE 2053
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#define MAXNAMELEN 256
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#define MAXDATALEN 8192
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struct terment {
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struct terment *next;
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char *name;
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int fd;
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TMT *vt;
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};
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#define SETNODE 1
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#define WRITE 2
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#define READBUFF 0
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#define CLOSECONN 3
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#define MAXEVTS 16
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static struct terment *buffers[HASHSIZE];
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static char* nodenames[HASHSIZE];
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unsigned long hash(char *str)
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/* djb2a */
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{
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unsigned long idx = 5381;
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int c;
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while ((c = *str++))
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idx = ((idx << 5) + idx) + c;
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return idx % HASHSIZE;
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}
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TMT *get_termentbyname(char *name) {
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struct terment *ret;
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for (ret = buffers[hash(name)]; ret != NULL; ret = ret->next)
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if (strcmp(name, ret->name) == 0)
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return ret->vt;
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return NULL;
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}
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TMT *set_termentbyname(char *name, int fd) {
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struct terment *ret;
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int idx;
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if (nodenames[fd] == NULL) {
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nodenames[fd] = strdup(name);
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}
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idx = hash(name);
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for (ret = buffers[idx]; ret != NULL; ret = ret->next)
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if (strcmp(name, ret->name) == 0)
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return ret->vt;
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ret = (struct terment *)malloc(sizeof(*ret));
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ret->next = buffers[idx];
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ret->name = strdup(name);
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ret->fd = fd;
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ret->vt = tmt_open(31, 100, NULL, NULL, L"→←↑↓■◆▒°±▒┘┐┌└┼⎺───⎽├┤┴┬│≤≥π≠£•");
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buffers[idx] = ret;
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return ret->vt;
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}
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void dump_vt(TMT* outvt, int outfd) {
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const TMTSCREEN *out = tmt_screen(outvt);
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const TMTPOINT *curs = tmt_cursor(outvt);
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int line, idx, maxcol, maxrow;
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bool bold = false;
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bool dim = false;
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bool underline = false;
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bool blink = false;
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bool reverse = false;
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bool invisible = false;
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bool intensitychg = false;
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tmt_color_t fg = TMT_COLOR_DEFAULT;
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tmt_color_t bg = TMT_COLOR_DEFAULT;
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wchar_t sgrline[30];
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char strbuffer[128];
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size_t srgidx = 0;
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char colorcode = 0;
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write(outfd, "\033c", 2);
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maxcol = 0;
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maxrow = 0;
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for (line = out->nline - 1; line >= 0; --line) {
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for (idx = out->ncol - 1; idx > maxcol; --idx) {
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if (out->lines[line]->chars[idx].c != L' ') {
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if (maxrow < line)
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maxrow = line;
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maxcol = idx;
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break;
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}
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}
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}
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for (line = 0; line <= maxrow; line++) {
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for (idx = 0; idx <= maxcol; idx++) {
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sgrline[0] = L'\x00';
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intensitychg = false;
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if (out->lines[line]->chars[idx].a.bold != bold) {
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bold = out->lines[line]->chars[idx].a.bold;
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intensitychg = true; // Can't unbold without changing dim
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}
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if (out->lines[line]->chars[idx].a.dim != dim) {
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dim = out->lines[line]->chars[idx].a.dim;
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intensitychg = true; // Can't undim without changing bold
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}
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if (intensitychg) {
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intensitychg = false;
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wcscat(sgrline, L"22;");
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if (bold)
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wcscat(sgrline, L"1;");
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if (dim)
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wcscat(sgrline, L"2;");
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}
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if (out->lines[line]->chars[idx].a.underline != underline) {
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underline = out->lines[line]->chars[idx].a.underline;
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if (underline)
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wcscat(sgrline, L"4;");
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else
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wcscat(sgrline, L"24;");
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}
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if (out->lines[line]->chars[idx].a.blink != blink) {
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blink = out->lines[line]->chars[idx].a.blink;
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if (blink)
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wcscat(sgrline, L"5;");
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else
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wcscat(sgrline, L"25;");
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}
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if (out->lines[line]->chars[idx].a.reverse != reverse) {
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reverse = out->lines[line]->chars[idx].a.reverse;
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if (reverse)
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wcscat(sgrline, L"7;");
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else
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wcscat(sgrline, L"27;");
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}
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if (out->lines[line]->chars[idx].a.invisible != invisible) {
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invisible = out->lines[line]->chars[idx].a.invisible;
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if (invisible)
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wcscat(sgrline, L"8;");
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else
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wcscat(sgrline, L"28;");
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}
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if (out->lines[line]->chars[idx].a.fg != fg) {
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fg = out->lines[line]->chars[idx].a.fg;
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if (fg == TMT_COLOR_DEFAULT)
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colorcode = 39;
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else
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colorcode = 29 + fg;
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swprintf(sgrline + wcslen(sgrline), 4, L"%d;", colorcode);
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}
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if (out->lines[line]->chars[idx].a.bg != bg) {
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bg = out->lines[line]->chars[idx].a.bg;
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if (bg == TMT_COLOR_DEFAULT)
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colorcode = 49;
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else
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colorcode = 39 + bg;
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swprintf(sgrline + wcslen(sgrline), 4, L"%d;", colorcode);
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}
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if (sgrline[0] != 0) {
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sgrline[wcslen(sgrline) - 1] = 0; // Trim last ;
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snprintf(strbuffer, sizeof(strbuffer), "\033[%lsm", sgrline);
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write(outfd, strbuffer, strlen(strbuffer));
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write(outfd, "\033[]", 3);
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}
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snprintf(strbuffer, sizeof(strbuffer), "%lc", out->lines[line]->chars[idx].c);
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write(outfd, strbuffer, strlen(strbuffer));
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}
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if (line < maxrow)
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write(outfd, "\r\n", 2);
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}
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//fflush(stdout);
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snprintf(strbuffer, sizeof(strbuffer), "\x1b[%ld;%ldH", curs->r + 1, curs->c + 1);
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write(outfd, strbuffer, strlen(strbuffer));
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//fflush(stdout);
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}
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int handle_traffic(int fd) {
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int cmd, length;
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char currnode[MAXNAMELEN];
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char cmdbuf[MAXDATALEN];
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char *nodename;
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TMT *currvt = NULL;
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TMT *outvt = NULL;
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length = read(fd, &cmd, 4);
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if (length <= 0) {
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return 0;
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}
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length = cmd & 536870911;
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cmd = cmd >> 29;
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if (cmd == SETNODE) {
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cmd = read(fd, currnode, length);
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currnode[length] = 0;
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if (cmd < 0)
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return 0;
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currvt = set_termentbyname(currnode, fd);
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} else if (cmd == WRITE) {
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if (currvt == NULL) {
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nodename = nodenames[fd];
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currvt = set_termentbyname(nodename, fd);
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}
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cmd = read(fd, cmdbuf, length);
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cmdbuf[length] = 0;
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if (cmd < 0)
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return 0;
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tmt_write(currvt, cmdbuf, length);
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} else if (cmd == READBUFF) {
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cmd = read(fd, cmdbuf, length);
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cmdbuf[length] = 0;
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if (cmd < 0)
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return 0;
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outvt = get_termentbyname(cmdbuf);
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if (outvt != NULL)
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dump_vt(outvt, fd);
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length = write(fd, "\x00", 1);
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if (length < 0)
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return 0;
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} else if (cmd == CLOSECONN) {
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return 0;
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}
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return 1;
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}
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int main(int argc, char* argv[]) {
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setlocale(LC_ALL, "");
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struct sockaddr_un addr;
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int numevts;
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int status;
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int poller;
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int n;
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socklen_t len;
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int ctlsock, currsock;
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socklen_t addrlen;
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struct ucred ucr;
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struct epoll_event epvt, evts[MAXEVTS];
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stdin = freopen(NULL, "rb", stdin);
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if (stdin == NULL) {
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exit(1);
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}
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memset(&addr, 0, sizeof(struct sockaddr_un));
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addr.sun_family = AF_UNIX;
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strncpy(addr.sun_path + 1, argv[1], sizeof(addr.sun_path) - 2); // abstract namespace socket
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ctlsock = socket(AF_UNIX, SOCK_STREAM, 0);
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status = bind(ctlsock, (const struct sockaddr*)&addr, sizeof(sa_family_t) + strlen(argv[1]) + 1); //sizeof(struct sockaddr_un));
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if (status < 0) {
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perror("Unable to open unix socket - ");
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exit(1);
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}
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listen(ctlsock, 128);
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poller = epoll_create(1);
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memset(&epvt, 0, sizeof(struct epoll_event));
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epvt.events = EPOLLIN;
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epvt.data.fd = ctlsock;
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if (epoll_ctl(poller, EPOLL_CTL_ADD, ctlsock, &epvt) < 0) {
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perror("Unable to poll the socket");
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exit(1);
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}
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// create a unix domain socket for accepting, each connection is only allowed to either read or write, not both
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while (1) {
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numevts = epoll_wait(poller, evts, MAXEVTS, -1);
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if (numevts < 0) {
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perror("Failed wait");
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exit(1);
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}
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for (n = 0; n < numevts; ++n) {
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if (evts[n].data.fd == ctlsock) {
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currsock = accept(ctlsock, (struct sockaddr *) &addr, &addrlen);
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len = sizeof(ucr);
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getsockopt(currsock, SOL_SOCKET, SO_PEERCRED, &ucr, &len);
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if (ucr.uid != getuid()) { // block access for other users
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close(currsock);
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continue;
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}
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memset(&epvt, 0, sizeof(struct epoll_event));
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epvt.events = EPOLLIN;
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epvt.data.fd = currsock;
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epoll_ctl(poller, EPOLL_CTL_ADD, currsock, &epvt);
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} else {
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if (!handle_traffic(evts[n].data.fd)) {
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epoll_ctl(poller, EPOLL_CTL_DEL, evts[n].data.fd, NULL);
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close(evts[n].data.fd);
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if (nodenames[evts[n].data.fd] != NULL) {
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free(nodenames[evts[n].data.fd]);
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nodenames[evts[n].data.fd] = NULL;
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}
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}
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}
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}
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}
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}
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