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comparison src/http/ngx_http_file_cache.c @ 202:74994aeef848

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nginx-0.0.1-2003-12-01-19:28:14 import
author Igor Sysoev <igor@sysoev.ru>
date Mon, 01 Dec 2003 16:28:14 +0000
parents
children 70e1c7d2b83d
comparison
equal deleted inserted replaced
201:267ea1d98683 202:74994aeef848
1
2 #include <ngx_config.h>
3 #include <ngx_core.h>
4 #include <ngx_http.h>
5
6
7 #include <md5.h>
8
9 #if (HAVE_OPENSSL_MD5)
10 #define MD5Init MD5_Init
11 #define MD5Update MD5_Update
12 #define MD5Final MD5_Final
13 #endif
14
15
16
17 int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx)
18 {
19 MD5_CTX md5;
20
21 /* we use offsetof() because sizeof() pads struct size to int size */
22 ctx->header_size = offsetof(ngx_http_cache_header_t, key)
23 + ctx->key.len + 1;
24
25 ctx->file.name.len = ctx->path->name.len + 1 + ctx->path->len + 32;
26 if (!(ctx->file.name.data = ngx_palloc(r->pool, ctx->file.name.len + 1))) {
27 return NGX_ERROR;
28 }
29
30 ngx_memcpy(ctx->file.name.data, ctx->path->name.data, ctx->path->name.len);
31
32 MD5Init(&md5);
33 MD5Update(&md5, (u_char *) ctx->key.data, ctx->key.len);
34 MD5Final(ctx->md5, &md5);
35
36 ngx_md5_text(ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len,
37 ctx->md5);
38
39 ngx_log_debug(r->connection->log, "URL: %s, md5: %s" _ ctx->key.data _
40 ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
41
42 ngx_create_hashed_filename(&ctx->file, ctx->path);
43
44 ngx_log_debug(r->connection->log, "FILE: %s" _ ctx->file.name.data);
45
46 /* TODO: look open files cache */
47
48 return ngx_http_cache_open_file(ctx, 0);
49 }
50
51
52 int ngx_http_cache_open_file(ngx_http_cache_ctx_t *ctx, ngx_file_uniq_t uniq)
53 {
54 ssize_t n;
55 ngx_err_t err;
56 ngx_http_cache_header_t *h;
57
58 ctx->file.fd = ngx_open_file(ctx->file.name.data,
59 NGX_FILE_RDONLY, NGX_FILE_OPEN);
60
61 if (ctx->file.fd == NGX_INVALID_FILE) {
62 err = ngx_errno;
63
64 if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
65 return NGX_DECLINED;
66 }
67
68 ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
69 ngx_open_file_n " \"%s\" failed", ctx->file.name.data);
70 return NGX_ERROR;
71 }
72
73 if (uniq) {
74 if (ngx_fd_info(ctx->file.fd, &ctx->file.info) == NGX_FILE_ERROR) {
75 ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
76 ngx_fd_info_n " \"%s\" failed", ctx->file.name.data);
77
78 return NGX_ERROR;
79 }
80
81 if (ngx_file_uniq(&ctx->file.info) == uniq) {
82 if (ngx_close_file(ctx->file.fd) == NGX_FILE_ERROR) {
83 ngx_log_error(NGX_LOG_ALERT, ctx->log, ngx_errno,
84 ngx_close_file_n " \"%s\" failed",
85 ctx->file.name.data);
86 }
87
88 return NGX_HTTP_CACHE_THE_SAME;
89 }
90 }
91
92 n = ngx_read_file(&ctx->file, ctx->buf->pos,
93 ctx->buf->end - ctx->buf->last, 0);
94
95 if (n == NGX_ERROR || n == NGX_AGAIN) {
96 return n;
97 }
98
99 if (n <= ctx->header_size) {
100 ngx_log_error(NGX_LOG_CRIT, ctx->log, 0,
101 "cache file \"%s\" is too small", ctx->file.name.data);
102 return NGX_ERROR;
103 }
104
105 h = (ngx_http_cache_header_t *) ctx->buf->pos;
106 ctx->expires = h->expires;
107 ctx->last_modified= h->last_modified;
108 ctx->date = h->date;
109 ctx->length = h->length;
110
111 if (h->key_len > (size_t) (ctx->buf->end - ctx->buf->pos)) {
112 ngx_log_error(NGX_LOG_ALERT, ctx->log, 0,
113 "cache file \"%s\" is probably invalid",
114 ctx->file.name.data);
115 return NGX_DECLINED;
116 }
117
118 if (ctx->key.len
119 && (h->key_len != ctx->key.len
120 || ngx_strncmp(h->key, ctx->key.data, h->key_len) != 0))
121 {
122 h->key[h->key_len] = '\0';
123 ngx_log_error(NGX_LOG_ALERT, ctx->log, 0,
124 "md5 collision: \"%s\" and \"%s\"",
125 h->key, ctx->key.data);
126 return NGX_DECLINED;
127 }
128
129 ctx->buf->last += n;
130
131 if (ctx->expires < ngx_time()) {
132 ngx_log_debug(ctx->log, "EXPIRED");
133 return NGX_HTTP_CACHE_STALE;
134 }
135
136 /* TODO: NGX_HTTP_CACHE_AGED */
137
138 return NGX_OK;
139 }
140
141
142 int ngx_http_cache_update_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx,
143 ngx_str_t *temp_file)
144 {
145 int retry;
146 ngx_err_t err;
147
148 retry = 0;
149
150 for ( ;; ) {
151 if (ngx_rename_file(temp_file->data, ctx->file.name.data) == NGX_OK) {
152 return NGX_OK;
153 }
154
155 err = ngx_errno;
156
157 #if (WIN32)
158 if (err == NGX_EEXIST) {
159 if (ngx_win32_rename_file(temp_file, &ctx->file.name, r->pool)
160 == NGX_ERROR)
161 {
162 return NGX_ERROR;
163 }
164 }
165 #endif
166
167 if (retry || (err != NGX_ENOENT && err != NGX_ENOTDIR)) {
168 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
169 ngx_rename_file_n "(\"%s\", \"%s\") failed",
170 temp_file->data, ctx->file.name.data);
171
172 return NGX_ERROR;
173 }
174
175 if (ngx_create_path(&ctx->file, ctx->path) == NGX_ERROR) {
176 return NGX_ERROR;
177 }
178
179 retry = 1;
180 }
181 }
182
183
184 int ngx_garbage_collector_http_cache_handler(ngx_gc_t *gc, ngx_str_t *name,
185 ngx_dir_t *dir)
186 {
187 int rc;
188 char data[sizeof(ngx_http_cache_header_t)];
189 ngx_hunk_t buf;
190 ngx_http_cache_ctx_t ctx;
191
192 ctx.file.fd = NGX_INVALID_FILE;
193 ctx.file.name = *name;
194 ctx.file.log = gc->log;
195
196 ctx.header_size = sizeof(ngx_http_cache_header_t);
197 ctx.buf = &buf;
198 ctx.log = gc->log;
199 ctx.key.len = 0;
200
201 buf.type = NGX_HUNK_IN_MEMORY|NGX_HUNK_TEMP;
202 buf.pos = data;
203 buf.last = data;
204 buf.start = data;
205 buf.end = data + sizeof(ngx_http_cache_header_t);
206
207 rc = ngx_http_cache_open_file(&ctx, 0);
208
209 /* TODO: NGX_AGAIN */
210
211 if (rc != NGX_ERROR && rc != NGX_DECLINED && rc != NGX_HTTP_CACHE_STALE) {
212 return NGX_OK;
213 }
214
215 if (ngx_delete_file(name->data) == NGX_FILE_ERROR) {
216 ngx_log_error(NGX_LOG_CRIT, gc->log, ngx_errno,
217 ngx_delete_file_n " \"%s\" failed", name->data);
218 return NGX_ERROR;
219 }
220
221 gc->deleted++;
222 gc->freed += ngx_de_size(dir);
223
224 return NGX_OK;
225 }