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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <md5.h>
int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx)
{
int small;
ssize_t n, len;
MD5_CTX md5;
ngx_err_t err;
ngx_str_t key;
ngx_http_bin_cache_t *h;
ctx->file.name.len = ctx->path->name.len + 1 + ctx->path->len + 32;
if (!(ctx->file.name.data = ngx_palloc(r->pool, ctx->file.name.len + 1))) {
return NGX_ERROR;
}
ngx_memcpy(ctx->file.name.data, ctx->path->name.data, ctx->path->name.len);
MD5Init(&md5);
MD5Update(&md5, (u_char *) ctx->key.data, ctx->key.len);
MD5End(&md5,
ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
ngx_log_debug(r->connection->log, "URL: %s, md5: %s" _ ctx->key.data _
ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
ngx_create_hashed_filename(&ctx->file, ctx->path);
ngx_log_debug(r->connection->log, "FILE: %s" _ ctx->file.name.data);
/* TODO: look open files cache */
ctx->file.fd = ngx_open_file(ctx->file.name.data,
NGX_FILE_RDONLY, NGX_FILE_OPEN);
if (ctx->file.fd == NGX_INVALID_FILE) {
err = ngx_errno;
if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
/* TODO: text size */
ctx->header.size = 2 * sizeof(ssize_t)
+ sizeof(ngx_http_cache_header_t)
+ ctx->key.len + 1;
return NGX_DECLINED;
}
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_open_file_n " \"%s\" failed", ctx->file.name.data);
return NGX_ERROR;
}
n = ngx_read_file(&ctx->file, ctx->buf->pos,
ctx->buf->end - ctx->buf->last, 0);
if (n == NGX_ERROR || n == NGX_AGAIN) {
return n;
}
len = 0;
small = 1;
if (n > 1) {
if (ctx->buf->pos[0] == 'T') {
/* STUB */
return NGX_ERROR;
} else if (ctx->buf->pos[0] == 'B') {
len = sizeof(ngx_http_bin_cache_t);
if (n > len) {
h = (ngx_http_bin_cache_t *) ctx->buf->pos;
key.len = h->key_len;
if (n >= len + (ssize_t) key.len + 1) {
ctx->header = h->header;
key.data = h->key;
small = 0;
}
}
} else {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"unknown type of cache file \"%s\"",
ctx->file.name.data);
return NGX_ERROR;
}
}
if (small) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"cache file \"%s\" is to small", ctx->file.name.data);
return NGX_ERROR;
}
if (key.len != ctx->key.len
|| ngx_strncmp(key.data, ctx->key.data, key.len) != 0)
{
key.data[key.len] = '\0';
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"md5 collision: \"%s\" and \"%s\"",
key.data, ctx->key.data);
return NGX_DECLINED;
}
ctx->header.size = len + key.len + 1;
ctx->buf->last += n;
return NGX_OK;
}
int ngx_http_cache_update_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx,
ngx_str_t *temp_file)
{
int retry;
ngx_err_t err;
retry = 0;
for ( ;; ) {
if (ngx_rename_file(temp_file->data, ctx->file.name.data)
!= NGX_FILE_ERROR)
{
return NGX_OK;
}
err = ngx_errno;
if (retry || (err != NGX_ENOENT && err != NGX_ENOTDIR)) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_rename_file_n "(\"%s\", \"%s\") failed",
temp_file->data, ctx->file.name.data);
return NGX_ERROR;
}
if (ngx_create_path(&ctx->file, ctx->path) == NGX_ERROR) {
return NGX_ERROR;
}
retry = 1;
}
}
#if 0
/*
* small file in malloc()ed memory, mmap()ed file, file descriptor only,
* file access time only (to estimate could pages still be in memory),
* translated URI (ngx_http_index_hanlder),
* compiled script (ngx_http_ssi_filter).
*/
#define NGX_HTTP_CACHE_ENTRY_DELETED 0x00000001
#define NGX_HTTP_CACHE_ENTRY_MMAPED 0x00000002
/* "/" -> "/index.html" in ngx_http_index_handler */
#define NGX_HTTP_CACHE_ENTRY_URI 0x00000004
/* 301 location "/dir" -> "dir/" in ngx_http_core_handler */
/* compiled script in ngx_http_ssi_filter */
#define NGX_HTTP_CACHE_ENTRY_SCRIPT 0x00000008
#define NGX_HTTP_CACHE_FILTER_FLAGS 0xFFFF0000
typedef struct {
ngx_fd_t fd;
off_t size;
void *data;
time_t accessed;
time_t last_modified;
time_t updated; /* no needed with kqueue */
int refs;
int flags;
} ngx_http_cache_entry_t;
typedef struct {
u_int32_t crc;
ngx_str_t uri;
ngx_http_cache_t *cache;
} ngx_http_cache_hash_entry_t;
typedef struct {
ngx_http_cache_t *cache;
u_int32_t crc;
int n;
} ngx_http_cache_handle_t;
int ngx_http_cache_get(ngx_http_cache_hash_t *cache_hash,
ngx_str_t *uri, ngx_http_cache_handle_t *h)
{
int hi;
ngx_http_cache_hash_entry_t *entry;
h->crc = ngx_crc(uri->data, uri->len);
hi = h->crc % cache_hash->size;
entry = cache_hash[hi].elts;
for (i = 0; i < cache_hash[hi].nelts; i++) {
if (entry[i].crc == crc
&& entry[i].uri.len == uri->len
&& ngx_strncmp(entry[i].uri.data, uri->data, uri->len) == 0
{
h->cache = entry[i].cache;
h->cache->refs++;
h->n = hi;
return NGX_OK;
}
}
return NGX_ERROR;
}
/* 32-bit crc16 */
int ngx_crc(char *data, size_t len)
{
u_int32_t sum;
for (sum = 0; len; len--) {
/*
* gcc 2.95.2 x86 and icc 7.1.006 compile that operator
* into the single rol opcode.
* msvc 6.0sp2 compiles it into four opcodes.
*/
sum = sum >> 1 | sum << 31;
sum += *data++;
}
return sum;
}
#endif
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