view src/http/v2/ngx_http_v2_encode.c @ 9202:e88cdaa0f1ff

AIO operations now add timers (ticket #2162). Each AIO (thread IO) operation being run is now accompanied with 1-minute timer. This timer prevents unexpected shutdown of the worker process while an AIO operation is running, and logs an alert if the operation is running for too long. This fixes "open socket left" alerts during worker processes shutdown due to pending AIO (or thread IO) operations while corresponding requests have no timers. In particular, such errors were observed while reading cache headers (ticket #2162), and with worker_shutdown_timeout.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 29 Jan 2024 10:31:37 +0300
parents 336084ff943b
children
line wrap: on
line source


/*
 * Copyright (C) Nginx, Inc.
 * Copyright (C) Valentin V. Bartenev
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


static u_char *ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix,
    ngx_uint_t value);


u_char *
ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, u_char *tmp,
    ngx_uint_t lower)
{
    size_t  hlen;

    hlen = ngx_http_huff_encode(src, len, tmp, lower);

    if (hlen > 0) {
        *dst = NGX_HTTP_V2_ENCODE_HUFF;
        dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), hlen);
        return ngx_cpymem(dst, tmp, hlen);
    }

    *dst = NGX_HTTP_V2_ENCODE_RAW;
    dst = ngx_http_v2_write_int(dst, ngx_http_v2_prefix(7), len);

    if (lower) {
        ngx_strlow(dst, src, len);
        return dst + len;
    }

    return ngx_cpymem(dst, src, len);
}


static u_char *
ngx_http_v2_write_int(u_char *pos, ngx_uint_t prefix, ngx_uint_t value)
{
    if (value < prefix) {
        *pos++ |= value;
        return pos;
    }

    *pos++ |= prefix;
    value -= prefix;

    while (value >= 128) {
        *pos++ = value % 128 + 128;
        value /= 128;
    }

    *pos++ = (u_char) value;

    return pos;
}