view src/http/modules/ngx_http_slice_filter_module.c @ 6785:d1d0dd69a419

Upstream: added the ngx_http_upstream_resolved_t.name field. This fixes inconsistency in what is stored in the "host" field. Normally it would contain the "host" part of the parsed URL (e.g., proxy_pass with variables), but for the case of an implicit upstream specified with literal address it contained the text representation of the socket address (that is, host including port for IP). Now the "host" field always contains the "host" part of the URL, while the text representation of the socket address is stored in the newly added "name" field. The ngx_http_upstream_create_round_robin_peer() function was modified accordingly in a way to be compatible with the code that does not know about the new "name" field. The "stream" code was similarly modified except for not adding compatibility in ngx_stream_upstream_create_round_robin_peer(). This change is also a prerequisite for the next change.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 31 Oct 2016 18:33:33 +0300
parents 4f0f4f02c98f
children d16ba0ea3434
line wrap: on
line source


/*
 * Copyright (C) Roman Arutyunyan
 * Copyright (C) Nginx, Inc.
 */


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


typedef struct {
    size_t      size;
} ngx_http_slice_loc_conf_t;


typedef struct {
    off_t       start;
    off_t       end;
    ngx_str_t   range;
    ngx_str_t   etag;
    ngx_uint_t  last;  /* unsigned  last:1; */
} ngx_http_slice_ctx_t;


typedef struct {
    off_t       start;
    off_t       end;
    off_t       complete_length;
} ngx_http_slice_content_range_t;


static ngx_int_t ngx_http_slice_header_filter(ngx_http_request_t *r);
static ngx_int_t ngx_http_slice_body_filter(ngx_http_request_t *r,
    ngx_chain_t *in);
static ngx_int_t ngx_http_slice_parse_content_range(ngx_http_request_t *r,
    ngx_http_slice_content_range_t *cr);
static ngx_int_t ngx_http_slice_range_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data);
static off_t ngx_http_slice_get_start(ngx_http_request_t *r);
static void *ngx_http_slice_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent,
    void *child);
static ngx_int_t ngx_http_slice_add_variables(ngx_conf_t *cf);
static ngx_int_t ngx_http_slice_init(ngx_conf_t *cf);


static ngx_command_t  ngx_http_slice_filter_commands[] = {

    { ngx_string("slice"),
      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_size_slot,
      NGX_HTTP_LOC_CONF_OFFSET,
      offsetof(ngx_http_slice_loc_conf_t, size),
      NULL },

      ngx_null_command
};


static ngx_http_module_t  ngx_http_slice_filter_module_ctx = {
    ngx_http_slice_add_variables,          /* preconfiguration */
    ngx_http_slice_init,                   /* postconfiguration */

    NULL,                                  /* create main configuration */
    NULL,                                  /* init main configuration */

    NULL,                                  /* create server configuration */
    NULL,                                  /* merge server configuration */

    ngx_http_slice_create_loc_conf,        /* create location configuration */
    ngx_http_slice_merge_loc_conf          /* merge location configuration */
};


ngx_module_t  ngx_http_slice_filter_module = {
    NGX_MODULE_V1,
    &ngx_http_slice_filter_module_ctx,     /* module context */
    ngx_http_slice_filter_commands,        /* module directives */
    NGX_HTTP_MODULE,                       /* module type */
    NULL,                                  /* init master */
    NULL,                                  /* init module */
    NULL,                                  /* init process */
    NULL,                                  /* init thread */
    NULL,                                  /* exit thread */
    NULL,                                  /* exit process */
    NULL,                                  /* exit master */
    NGX_MODULE_V1_PADDING
};


static ngx_str_t  ngx_http_slice_range_name = ngx_string("slice_range");

static ngx_http_output_header_filter_pt  ngx_http_next_header_filter;
static ngx_http_output_body_filter_pt    ngx_http_next_body_filter;


static ngx_int_t
ngx_http_slice_header_filter(ngx_http_request_t *r)
{
    off_t                            end;
    ngx_int_t                        rc;
    ngx_table_elt_t                 *h;
    ngx_http_slice_ctx_t            *ctx;
    ngx_http_slice_loc_conf_t       *slcf;
    ngx_http_slice_content_range_t   cr;

    ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module);
    if (ctx == NULL) {
        return ngx_http_next_header_filter(r);
    }

    if (r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT) {
        if (r == r->main) {
            ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module);
            return ngx_http_next_header_filter(r);
        }

        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "unexpected status code %ui in slice response",
                      r->headers_out.status);
        return NGX_ERROR;
    }

    h = r->headers_out.etag;

    if (ctx->etag.len) {
        if (h == NULL
            || h->value.len != ctx->etag.len
            || ngx_strncmp(h->value.data, ctx->etag.data, ctx->etag.len)
               != 0)
        {
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "etag mismatch in slice response");
            return NGX_ERROR;
        }
    }

    if (h) {
        ctx->etag = h->value;
    }

    if (ngx_http_slice_parse_content_range(r, &cr) != NGX_OK) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "invalid range in slice response");
        return NGX_ERROR;
    }

    if (cr.complete_length == -1) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "no complete length in slice response");
        return NGX_ERROR;
    }

    ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http slice response range: %O-%O/%O",
                   cr.start, cr.end, cr.complete_length);

    slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module);

    end = ngx_min(cr.start + (off_t) slcf->size, cr.complete_length);

    if (cr.start != ctx->start || cr.end != end) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "unexpected range in slice response: %O-%O",
                      cr.start, cr.end);
        return NGX_ERROR;
    }

    ctx->start = end;

    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.status_line.len = 0;
    r->headers_out.content_length_n = cr.complete_length;
    r->headers_out.content_offset = cr.start;
    r->headers_out.content_range->hash = 0;
    r->headers_out.content_range = NULL;

    r->allow_ranges = 1;
    r->subrequest_ranges = 1;
    r->single_range = 1;

    rc = ngx_http_next_header_filter(r);

    if (r != r->main) {
        return rc;
    }

    if (r->headers_out.status == NGX_HTTP_PARTIAL_CONTENT) {
        if (ctx->start + (off_t) slcf->size <= r->headers_out.content_offset) {
            ctx->start = slcf->size
                         * (r->headers_out.content_offset / slcf->size);
        }

        ctx->end = r->headers_out.content_offset
                   + r->headers_out.content_length_n;

    } else {
        ctx->end = cr.complete_length;
    }

    return rc;
}


static ngx_int_t
ngx_http_slice_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
    ngx_int_t                   rc;
    ngx_chain_t                *cl;
    ngx_http_request_t         *sr;
    ngx_http_slice_ctx_t       *ctx;
    ngx_http_slice_loc_conf_t  *slcf;

    ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module);

    if (ctx == NULL || r != r->main) {
        return ngx_http_next_body_filter(r, in);
    }

    for (cl = in; cl; cl = cl->next) {
        if (cl->buf->last_buf) {
            cl->buf->last_buf = 0;
            cl->buf->last_in_chain = 1;
            cl->buf->sync = 1;
            ctx->last = 1;
        }
    }

    rc = ngx_http_next_body_filter(r, in);

    if (rc == NGX_ERROR || !ctx->last) {
        return rc;
    }

    if (ctx->start >= ctx->end) {
        ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module);
        ngx_http_send_special(r, NGX_HTTP_LAST);
        return rc;
    }

    if (r->buffered) {
        return rc;
    }

    if (ngx_http_subrequest(r, &r->uri, &r->args, &sr, NULL, 0) != NGX_OK) {
        return NGX_ERROR;
    }

    ngx_http_set_ctx(sr, ctx, ngx_http_slice_filter_module);

    slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module);

    ctx->range.len = ngx_sprintf(ctx->range.data, "bytes=%O-%O", ctx->start,
                                 ctx->start + (off_t) slcf->size - 1)
                     - ctx->range.data;

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http slice subrequest: \"%V\"", &ctx->range);

    return rc;
}


static ngx_int_t
ngx_http_slice_parse_content_range(ngx_http_request_t *r,
    ngx_http_slice_content_range_t *cr)
{
    off_t             start, end, complete_length, cutoff, cutlim;
    u_char           *p;
    ngx_table_elt_t  *h;

    h = r->headers_out.content_range;

    if (h == NULL
        || h->value.len < 7
        || ngx_strncmp(h->value.data, "bytes ", 6) != 0)
    {
        return NGX_ERROR;
    }

    p = h->value.data + 6;

    cutoff = NGX_MAX_OFF_T_VALUE / 10;
    cutlim = NGX_MAX_OFF_T_VALUE % 10;

    start = 0;
    end = 0;
    complete_length = 0;

    while (*p == ' ') { p++; }

    if (*p < '0' || *p > '9') {
        return NGX_ERROR;
    }

    while (*p >= '0' && *p <= '9') {
        if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) {
            return NGX_ERROR;
        }

        start = start * 10 + *p++ - '0';
    }

    while (*p == ' ') { p++; }

    if (*p++ != '-') {
        return NGX_ERROR;
    }

    while (*p == ' ') { p++; }

    if (*p < '0' || *p > '9') {
        return NGX_ERROR;
    }

    while (*p >= '0' && *p <= '9') {
        if (end >= cutoff && (end > cutoff || *p - '0' > cutlim)) {
            return NGX_ERROR;
        }

        end = end * 10 + *p++ - '0';
    }

    end++;

    while (*p == ' ') { p++; }

    if (*p++ != '/') {
        return NGX_ERROR;
    }

    while (*p == ' ') { p++; }

    if (*p != '*') {
        if (*p < '0' || *p > '9') {
            return NGX_ERROR;
        }

        while (*p >= '0' && *p <= '9') {
            if (complete_length >= cutoff
                && (complete_length > cutoff || *p - '0' > cutlim))
            {
                return NGX_ERROR;
            }

            complete_length = complete_length * 10 + *p++ - '0';
        }

    } else {
        complete_length = -1;
        p++;
    }

    while (*p == ' ') { p++; }

    if (*p != '\0') {
        return NGX_ERROR;
    }

    cr->start = start;
    cr->end = end;
    cr->complete_length = complete_length;

    return NGX_OK;
}


static ngx_int_t
ngx_http_slice_range_variable(ngx_http_request_t *r,
    ngx_http_variable_value_t *v, uintptr_t data)
{
    u_char                     *p;
    ngx_http_slice_ctx_t       *ctx;
    ngx_http_slice_loc_conf_t  *slcf;

    ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module);

    if (ctx == NULL) {
        if (r != r->main || r->headers_out.status) {
            v->not_found = 1;
            return NGX_OK;
        }

        slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module);

        if (slcf->size == 0) {
            v->not_found = 1;
            return NGX_OK;
        }

        ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_slice_ctx_t));
        if (ctx == NULL) {
            return NGX_ERROR;
        }

        ngx_http_set_ctx(r, ctx, ngx_http_slice_filter_module);

        p = ngx_pnalloc(r->pool, sizeof("bytes=-") - 1 + 2 * NGX_OFF_T_LEN);
        if (p == NULL) {
            return NGX_ERROR;
        }

        ctx->start = slcf->size * (ngx_http_slice_get_start(r) / slcf->size);

        ctx->range.data = p;
        ctx->range.len = ngx_sprintf(p, "bytes=%O-%O", ctx->start,
                                     ctx->start + (off_t) slcf->size - 1)
                         - p;
    }

    v->data = ctx->range.data;
    v->valid = 1;
    v->not_found = 0;
    v->no_cacheable = 1;
    v->len = ctx->range.len;

    return NGX_OK;
}


static off_t
ngx_http_slice_get_start(ngx_http_request_t *r)
{
    off_t             start, cutoff, cutlim;
    u_char           *p;
    ngx_table_elt_t  *h;

    if (r->headers_in.if_range) {
        return 0;
    }

    h = r->headers_in.range;

    if (h == NULL
        || h->value.len < 7
        || ngx_strncasecmp(h->value.data, (u_char *) "bytes=", 6) != 0)
    {
        return 0;
    }

    p = h->value.data + 6;

    if (ngx_strchr(p, ',')) {
        return 0;
    }

    while (*p == ' ') { p++; }

    if (*p == '-') {
        return 0;
    }

    cutoff = NGX_MAX_OFF_T_VALUE / 10;
    cutlim = NGX_MAX_OFF_T_VALUE % 10;

    start = 0;

    while (*p >= '0' && *p <= '9') {
        if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) {
            return 0;
        }

        start = start * 10 + *p++ - '0';
    }

    return start;
}


static void *
ngx_http_slice_create_loc_conf(ngx_conf_t *cf)
{
    ngx_http_slice_loc_conf_t  *slcf;

    slcf = ngx_palloc(cf->pool, sizeof(ngx_http_slice_loc_conf_t));
    if (slcf == NULL) {
        return NULL;
    }

    slcf->size = NGX_CONF_UNSET_SIZE;

    return slcf;
}


static char *
ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_http_slice_loc_conf_t *prev = parent;
    ngx_http_slice_loc_conf_t *conf = child;

    ngx_conf_merge_size_value(conf->size, prev->size, 0);

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_http_slice_add_variables(ngx_conf_t *cf)
{
    ngx_http_variable_t  *var;

    var = ngx_http_add_variable(cf, &ngx_http_slice_range_name, 0);
    if (var == NULL) {
        return NGX_ERROR;
    }

    var->get_handler = ngx_http_slice_range_variable;

    return NGX_OK;
}


static ngx_int_t
ngx_http_slice_init(ngx_conf_t *cf)
{
    ngx_http_next_header_filter = ngx_http_top_header_filter;
    ngx_http_top_header_filter = ngx_http_slice_header_filter;

    ngx_http_next_body_filter = ngx_http_top_body_filter;
    ngx_http_top_body_filter = ngx_http_slice_body_filter;

    return NGX_OK;
}