iocore/cache/CacheHttp.cc

/** @file

  A brief file description

  @section license License

  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 */

#include "tscore/ink_config.h"
#include <cstring>
#include "P_Cache.h"

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

static vec_info default_vec_info;

static CacheHTTPInfo default_http_info;

CacheHTTPInfoVector::CacheHTTPInfoVector() : data(&default_vec_info, 4) {}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

CacheHTTPInfoVector::~CacheHTTPInfoVector()
{
  int i;

  for (i = 0; i < xcount; i++) {
    data[i].alternate.destroy();
  }
  vector_buf.clear();
  magic = nullptr;
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

int
CacheHTTPInfoVector::insert(CacheHTTPInfo *info, int index)
{
  if (index == CACHE_ALT_INDEX_DEFAULT) {
    index = xcount++;
  }

  data(index).alternate.copy_shallow(info);
  return index;
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

void
CacheHTTPInfoVector::detach(int idx, CacheHTTPInfo *r)
{
  int i;

  ink_assert(idx >= 0);
  ink_assert(idx < xcount);

  r->copy_shallow(&data[idx].alternate);
  data[idx].alternate.destroy();

  for (i = idx; i < (xcount - 1); i++) {
    data[i] = data[i + i];
  }

  xcount -= 1;
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

void
CacheHTTPInfoVector::remove(int idx, bool destroy)
{
  if (destroy) {
    data[idx].alternate.destroy();
  }

  for (; idx < (xcount - 1); idx++) {
    data[idx] = data[idx + 1];
  }

  xcount--;
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

void
CacheHTTPInfoVector::clear(bool destroy)
{
  int i;

  if (destroy) {
    for (i = 0; i < xcount; i++) {
      data[i].alternate.destroy();
    }
  }
  xcount = 0;
  data.clear();
  vector_buf.clear();
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

void
CacheHTTPInfoVector::print(char *buffer, size_t buf_size, bool temps)
{
  char buf[CRYPTO_HEX_SIZE], *p;
  int purl;
  int i, tmp;

  p    = buffer;
  purl = 1;

  for (i = 0; i < xcount; i++) {
    if (data[i].alternate.valid()) {
      if (purl) {
        Arena arena;
        char *url;

        purl = 0;
        URL u;
        data[i].alternate.request_url_get(&u);
        url = u.string_get(&arena);
        if (url) {
          snprintf(p, buf_size, "[%s] ", url);
          tmp = strlen(p);
          p += tmp;
          buf_size -= tmp;
        }
      }

      if (temps || !(data[i].alternate.object_key_get() == zero_key)) {
        snprintf(p, buf_size, "[%d %s]", data[i].alternate.id_get(), CacheKey(data[i].alternate.object_key_get()).toHexStr(buf));
        tmp = strlen(p);
        p += tmp;
        buf_size -= tmp;
      }
    }
  }
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/

int
CacheHTTPInfoVector::marshal_length()
{
  int length = 0;

  for (int i = 0; i < xcount; i++) {
    length += data[i].alternate.marshal_length();
  }

  return length;
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/
int
CacheHTTPInfoVector::marshal(char *buf, int length)
{
  char *start = buf;
  int count   = 0;

  ink_assert(!(((intptr_t)buf) & 3)); // buf must be aligned

  for (int i = 0; i < xcount; i++) {
    int tmp = data[i].alternate.marshal(buf, length);
    length -= tmp;
    buf += tmp;
    count++;
  }

  GLOBAL_CACHE_SUM_GLOBAL_DYN_STAT(cache_hdr_vector_marshal_stat, 1);
  GLOBAL_CACHE_SUM_GLOBAL_DYN_STAT(cache_hdr_marshal_stat, count);
  GLOBAL_CACHE_SUM_GLOBAL_DYN_STAT(cache_hdr_marshal_bytes_stat, buf - start);
  return buf - start;
}

int
CacheHTTPInfoVector::unmarshal(const char *buf, int length, RefCountObj *block_ptr)
{
  ink_assert(!(((intptr_t)buf) & 3)); // buf must be aligned

  const char *start = buf;
  CacheHTTPInfo info;
  xcount = 0;

  while (length - (buf - start) > static_cast<int>(sizeof(HTTPCacheAlt))) {
    int tmp = HTTPInfo::unmarshal(const_cast<char *>(buf), length - (buf - start), block_ptr);
    if (tmp < 0) {
      return -1;
    }
    info.m_alt = (HTTPCacheAlt *)buf;
    buf += tmp;

    data(xcount).alternate = info;
    xcount++;
  }

  return (const_cast<caddr_t>(buf) - const_cast<caddr_t>(start));
}

/*-------------------------------------------------------------------------
  -------------------------------------------------------------------------*/
uint32_t
CacheHTTPInfoVector::get_handles(const char *buf, int length, RefCountObj *block_ptr)
{
  ink_assert(!(((intptr_t)buf) & 3)); // buf must be aligned

  const char *start = buf;
  CacheHTTPInfo info;
  xcount = 0;

  vector_buf = block_ptr;

  while (length - (buf - start) > static_cast<int>(sizeof(HTTPCacheAlt))) {
    int tmp = info.get_handle(const_cast<char *>(buf), length - (buf - start));
    if (tmp < 0) {
      ink_assert(!"CacheHTTPInfoVector::unmarshal get_handle() failed");
      return static_cast<uint32_t>(-1);
    }
    buf += tmp;

    data(xcount).alternate = info;
    xcount++;
  }

  return (const_cast<caddr_t>(buf) - const_cast<caddr_t>(start));
}