source: benchmark/io/http/protocol.cfa@ 0797198

#include "protocol.hfa"

#define _GNU_SOURCE
extern "C" {
        #include <fcntl.h>
}
#include <iofwd.hfa>

#include <assert.h>
// #include <stdio.h> // Don't use stdio.h, too slow to compile
extern "C" {
      int snprintf ( char * s, size_t n, const char * format, ... );
        #include <linux/io_uring.h>
}
#include <string.h>
#include <errno.h>

#include "options.hfa"

const char * http_msgs[] = {
        "HTTP/1.1 200 OK\nContent-Type: text/plain\nContent-Length: %zu\n\n",
        "HTTP/1.1 400 Bad Request\nContent-Type: text/plain\nContent-Length: 0\n\n",
        "HTTP/1.1 404 Not Found\nContent-Type: text/plain\nContent-Length: 0\n\n",
        "HTTP/1.1 413 Payload Too Large\nContent-Type: text/plain\nContent-Length: 0\n\n",
        "HTTP/1.1 414 URI Too Long\nContent-Type: text/plain\nContent-Length: 0\n\n",
};

_Static_assert( KNOWN_CODES == (sizeof(http_msgs ) / sizeof(http_msgs [0])));

const int http_codes[] = {
        200,
        400,
        404,
        413,
        414,
};

_Static_assert( KNOWN_CODES == (sizeof(http_codes) / sizeof(http_codes[0])));

int code_val(HttpCode code) {
        return http_codes[code];
}

static inline int answer( int fd, const char * it, int len) {
        while(len > 0) {
                // Call write
                int ret = write(fd, it, len);
                if( ret < 0 ) { if( errno != EAGAIN && errno != EWOULDBLOCK) abort( "'answer error' error: (%d) %s\n", (int)errno, strerror(errno) ); }

                // update it/len
                it  += ret;
                len -= ret;
        }
        return 0;
}

int answer_error( int fd, HttpCode code ) {
        /* paranoid */ assert( code < KNOWN_CODES && code != OK200 );
        int idx = (int)code;
        return answer( fd, http_msgs[idx], strlen( http_msgs[idx] ) );
}

int answer_header( int fd, size_t size ) {
        const char * fmt = http_msgs[OK200];
        int len = 100;
        char buffer[len];
        len = snprintf(buffer, len, fmt, size);
        return answer( fd, buffer, len );
}

[HttpCode code, bool closed, * const char file, size_t len] http_read(int fd, []char buffer, size_t len) {
        char * it = buffer;
        size_t count = len - 1;
        int rlen = 0;
        READ:
        for() {
                int ret = cfa_read(fd, (void*)it, count, 0, -1`s, 0p, 0p);
                if(ret == 0 ) return [OK200, true, 0, 0];
                if(ret < 0 ) {
                        if( errno == EAGAIN || errno == EWOULDBLOCK) continue READ;
                        abort( "read error: (%d) %s\n", (int)errno, strerror(errno) );
                }
                it[ret + 1] = '\0';
                rlen += ret;

                if( strstr( it, "\r\n\r\n" ) ) break;

                it += ret;
                count -= ret;

                if( count < 1 ) return [E414, false, 0, 0];
        }

        printf("%.*s\n", rlen, buffer);

        it = buffer;
        int ret = memcmp(it, "GET /", 5);
        if( ret != 0 ) return [E400, false, 0, 0];
        it += 5;

        char * end = strstr( it, " " );
        return [OK200, false, it, end - it];
}

void sendfile( int pipe[2], int fd, int ans_fd, size_t count ) {
        off_t offset = 0;
        ssize_t ret;
        SPLICE1: while(count > 0) {
                ret = cfa_splice(ans_fd, &offset, pipe[1], 0p, count, SPLICE_F_MOVE | SPLICE_F_MORE, 0, -1`s, 0p, 0p);
                if( ret < 0 ) {
                        if( errno != EAGAIN && errno != EWOULDBLOCK) continue SPLICE1;
                        abort( "splice [0] error: (%d) %s\n", (int)errno, strerror(errno) );
                }

                count -= ret;
                offset += ret;
                size_t in_pipe = ret;
                SPLICE2: while(in_pipe > 0) {
                        ret = cfa_splice(pipe[0], 0p, fd, 0p, in_pipe, SPLICE_F_MOVE | SPLICE_F_MORE, 0, -1`s, 0p, 0p);
                        if( ret < 0 ) {
                                if( errno != EAGAIN && errno != EWOULDBLOCK) continue SPLICE2;
                                abort( "splice [1] error: (%d) %s\n", (int)errno, strerror(errno) );
                        }
                        in_pipe -= ret;
                }

        }
}