blob: fdb0f256f6bcdf25264d76f92d3e97cd73273edb [file] [log] [blame]
/*
* Cache management
*
* Copyright 2017 HAProxy Technologies
* William Lallemand <wlallemand@haproxy.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <eb32tree.h>
#include <import/sha1.h>
#include <types/action.h>
#include <types/cli.h>
#include <types/filters.h>
#include <types/proxy.h>
#include <types/shctx.h>
#include <proto/channel.h>
#include <proto/cli.h>
#include <proto/proxy.h>
#include <proto/hdr_idx.h>
#include <proto/filters.h>
#include <proto/http_rules.h>
#include <proto/proto_http.h>
#include <proto/log.h>
#include <proto/stream.h>
#include <proto/stream_interface.h>
#include <proto/shctx.h>
#include <common/cfgparse.h>
#include <common/hash.h>
/* flt_cache_store */
static const char *cache_store_flt_id = "cache store filter";
static struct pool_head *pool_head_cache_st = NULL;
struct applet http_cache_applet;
struct flt_ops cache_ops;
struct cache {
struct list list; /* cache linked list */
struct eb_root entries; /* head of cache entries based on keys */
unsigned int maxage; /* max-age */
unsigned int maxblocks;
unsigned int maxobjsz; /* max-object-size (in bytes) */
char id[33]; /* cache name */
};
/*
* cache ctx for filters
*/
struct cache_st {
int hdrs_len;
struct shared_block *first_block;
};
struct cache_entry {
unsigned int latest_validation; /* latest validation date */
unsigned int expire; /* expiration date */
unsigned int age; /* Origin server "Age" header value */
unsigned int eoh; /* Origin server end of headers offset. */
struct eb32_node eb; /* ebtree node used to hold the cache object */
char hash[20];
unsigned char data[0];
};
#define CACHE_BLOCKSIZE 1024
#define CACHE_ENTRY_MAX_AGE 2147483648U
static struct list caches = LIST_HEAD_INIT(caches);
static struct cache *tmp_cache_config = NULL;
struct cache_entry *entry_exist(struct cache *cache, char *hash)
{
struct eb32_node *node;
struct cache_entry *entry;
node = eb32_lookup(&cache->entries, (*(unsigned int *)hash));
if (!node)
return NULL;
entry = eb32_entry(node, struct cache_entry, eb);
/* if that's not the right node */
if (memcmp(entry->hash, hash, sizeof(entry->hash)))
return NULL;
if (entry->expire > now.tv_sec) {
return entry;
} else {
eb32_delete(node);
entry->eb.key = 0;
}
return NULL;
}
static inline struct shared_context *shctx_ptr(struct cache *cache)
{
return (struct shared_context *)((unsigned char *)cache - ((struct shared_context *)NULL)->data);
}
static inline struct shared_block *block_ptr(struct cache_entry *entry)
{
return (struct shared_block *)((unsigned char *)entry - ((struct shared_block *)NULL)->data);
}
static int
cache_store_init(struct proxy *px, struct flt_conf *f1conf)
{
return 0;
}
static int
cache_store_chn_start_analyze(struct stream *s, struct filter *filter, struct channel *chn)
{
if (!(chn->flags & CF_ISRESP))
return 1;
if (filter->ctx == NULL) {
struct cache_st *st;
st = pool_alloc_dirty(pool_head_cache_st);
if (st == NULL)
return -1;
st->hdrs_len = 0;
st->first_block = NULL;
filter->ctx = st;
}
register_data_filter(s, chn, filter);
return 1;
}
static int
cache_store_chn_end_analyze(struct stream *s, struct filter *filter, struct channel *chn)
{
struct cache_st *st = filter->ctx;
struct cache *cache = filter->config->conf;
struct shared_context *shctx = shctx_ptr(cache);
if (!(chn->flags & CF_ISRESP))
return 1;
/* Everything should be released in the http_end filter, but we need to do it
* there too, in case of errors */
if (st && st->first_block) {
shctx_lock(shctx);
shctx_row_dec_hot(shctx, st->first_block);
shctx_unlock(shctx);
}
if (st) {
pool_free(pool_head_cache_st, st);
filter->ctx = NULL;
}
return 1;
}
static int
cache_store_http_headers(struct stream *s, struct filter *filter, struct http_msg *msg)
{
struct cache_st *st = filter->ctx;
if (!(msg->chn->flags & CF_ISRESP) || !st)
return 1;
st->hdrs_len = msg->sov;
return 1;
}
static inline void disable_cache_entry(struct cache_st *st,
struct filter *filter, struct shared_context *shctx)
{
struct cache_entry *object;
object = (struct cache_entry *)st->first_block->data;
filter->ctx = NULL; /* disable cache */
shctx_lock(shctx);
shctx_row_dec_hot(shctx, st->first_block);
object->eb.key = 0;
shctx_unlock(shctx);
pool_free(pool_head_cache_st, st);
}
static int
cache_store_http_forward_data(struct stream *s, struct filter *filter,
struct http_msg *msg, unsigned int len)
{
struct cache_st *st = filter->ctx;
struct shared_context *shctx = shctx_ptr((struct cache *)filter->config->conf);
int ret;
ret = 0;
/*
* We need to skip the HTTP headers first, because we saved them in the
* http-response action.
*/
if (!(msg->chn->flags & CF_ISRESP) || !st)
return len;
if (!len) {
/* Nothing to foward */
ret = len;
}
else if (st->hdrs_len >= len) {
/* Forward part of headers */
ret = len;
st->hdrs_len -= len;
}
else {
/* Forward data */
if (filter->ctx && st->first_block) {
int to_append, append;
struct shared_block *fb;
to_append = MIN(ci_contig_data(msg->chn), len - st->hdrs_len);
shctx_lock(shctx);
fb = shctx_row_reserve_hot(shctx, st->first_block, to_append);
if (!fb) {
shctx_unlock(shctx);
disable_cache_entry(st, filter, shctx);
return len;
}
shctx_unlock(shctx);
/* Skip remaining headers to fill the cache */
c_adv(msg->chn, st->hdrs_len);
append = shctx_row_data_append(shctx, st->first_block, st->first_block->last_append,
(unsigned char *)ci_head(msg->chn), to_append);
ret = st->hdrs_len + to_append - append;
/* Rewind the buffer to forward all data */
c_rew(msg->chn, st->hdrs_len);
st->hdrs_len = 0;
if (ret < 0)
disable_cache_entry(st, filter, shctx);
}
else
ret = len;
}
if ((ret != len) ||
(FLT_NXT(filter, msg->chn) != FLT_FWD(filter, msg->chn) + ret))
task_wakeup(s->task, TASK_WOKEN_MSG);
return ret;
}
static int
cache_store_http_end(struct stream *s, struct filter *filter,
struct http_msg *msg)
{
struct cache_st *st = filter->ctx;
struct cache *cache = filter->config->conf;
struct shared_context *shctx = shctx_ptr(cache);
struct cache_entry *object;
if (!(msg->chn->flags & CF_ISRESP))
return 1;
if (st && st->first_block) {
object = (struct cache_entry *)st->first_block->data;
/* does not need to test if the insertion worked, if it
* doesn't, the blocks will be reused anyway */
shctx_lock(shctx);
if (eb32_insert(&cache->entries, &object->eb) != &object->eb) {
object->eb.key = 0;
}
/* remove from the hotlist */
shctx_row_dec_hot(shctx, st->first_block);
shctx_unlock(shctx);
}
if (st) {
pool_free(pool_head_cache_st, st);
filter->ctx = NULL;
}
return 1;
}
/*
* This intends to be used when checking HTTP headers for some
* word=value directive. Return a pointer to the first character of value, if
* the word was not found or if there wasn't any value assigned ot it return NULL
*/
char *directive_value(const char *sample, int slen, const char *word, int wlen)
{
int st = 0;
if (slen < wlen)
return 0;
while (wlen) {
char c = *sample ^ *word;
if (c && c != ('A' ^ 'a'))
return NULL;
sample++;
word++;
slen--;
wlen--;
}
while (slen) {
if (st == 0) {
if (*sample != '=')
return NULL;
sample++;
slen--;
st = 1;
continue;
} else {
return (char *)sample;
}
}
return NULL;
}
/*
* Return the maxage in seconds of an HTTP response.
* Compute the maxage using either:
* - the assigned max-age of the cache
* - the s-maxage directive
* - the max-age directive
* - (Expires - Data) headers
* - the default-max-age of the cache
*
*/
int http_calc_maxage(struct stream *s, struct cache *cache)
{
struct http_txn *txn = s->txn;
struct hdr_ctx ctx;
int smaxage = -1;
int maxage = -1;
ctx.idx = 0;
/* loop on the Cache-Control values */
while (http_find_header2("Cache-Control", 13, ci_head(&s->res), &txn->hdr_idx, &ctx)) {
char *directive = ctx.line + ctx.val;
char *value;
value = directive_value(directive, ctx.vlen, "s-maxage", 8);
if (value) {
struct buffer *chk = get_trash_chunk();
chunk_strncat(chk, value, ctx.vlen - 8 + 1);
chunk_strncat(chk, "", 1);
maxage = atoi(chk->area);
}
value = directive_value(ctx.line + ctx.val, ctx.vlen, "max-age", 7);
if (value) {
struct buffer *chk = get_trash_chunk();
chunk_strncat(chk, value, ctx.vlen - 7 + 1);
chunk_strncat(chk, "", 1);
smaxage = atoi(chk->area);
}
}
/* TODO: Expires - Data */
if (smaxage > 0)
return MIN(smaxage, cache->maxage);
if (maxage > 0)
return MIN(maxage, cache->maxage);
return cache->maxage;
}
static void cache_free_blocks(struct shared_block *first, struct shared_block *block)
{
struct cache_entry *object = (struct cache_entry *)block->data;
if (first == block && object->eb.key)
eb32_delete(&object->eb);
object->eb.key = 0;
}
/*
* This fonction will store the headers of the response in a buffer and then
* register a filter to store the data
*/
enum act_return http_action_store_cache(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
unsigned int age;
long long hdr_age;
struct http_txn *txn = s->txn;
struct http_msg *msg = &txn->rsp;
struct filter *filter;
struct hdr_ctx ctx;
struct shared_block *first = NULL;
struct cache *cache = (struct cache *)rule->arg.act.p[0];
struct shared_context *shctx = shctx_ptr(cache);
struct cache_entry *object;
/* Don't cache if the response came from a cache */
if ((obj_type(s->target) == OBJ_TYPE_APPLET) &&
s->target == &http_cache_applet.obj_type) {
goto out;
}
/* cache only HTTP/1.1 */
if (!(txn->req.flags & HTTP_MSGF_VER_11))
goto out;
/* Do not cache too big objects. */
if ((msg->flags & HTTP_MSGF_CNT_LEN) && shctx->max_obj_size > 0 &&
msg->sov + msg->body_len > shctx->max_obj_size)
goto out;
/* cache only GET method */
if (txn->meth != HTTP_METH_GET)
goto out;
/* cache only 200 status code */
if (txn->status != 200)
goto out;
/* Does not manage Vary at the moment. We will need a secondary key later for that */
ctx.idx = 0;
if (http_find_header2("Vary", 4, ci_head(txn->rsp.chn), &txn->hdr_idx, &ctx))
goto out;
check_response_for_cacheability(s, &s->res);
if (!(txn->flags & TX_CACHEABLE) || !(txn->flags & TX_CACHE_COOK))
goto out;
age = 0;
ctx.idx = 0;
if (http_find_header2("Age", 3, ci_head(txn->rsp.chn), &txn->hdr_idx, &ctx)) {
if (!strl2llrc(ctx.line + ctx.val, ctx.vlen, &hdr_age) && hdr_age > 0) {
if (unlikely(hdr_age > CACHE_ENTRY_MAX_AGE))
hdr_age = CACHE_ENTRY_MAX_AGE;
age = hdr_age;
}
http_remove_header2(msg, &txn->hdr_idx, &ctx);
}
shctx_lock(shctx);
first = shctx_row_reserve_hot(shctx, NULL, sizeof(struct cache_entry) + msg->sov);
if (!first) {
shctx_unlock(shctx);
goto out;
}
shctx_unlock(shctx);
/* the received memory is not initialized, we need at least to mark
* the object as not indexed yet.
*/
object = (struct cache_entry *)first->data;
object->eb.node.leaf_p = NULL;
object->eb.key = 0;
object->age = age;
object->eoh = msg->eoh;
/* reserve space for the cache_entry structure */
first->len = sizeof(struct cache_entry);
first->last_append = NULL;
/* cache the headers in a http action because it allows to chose what
* to cache, for example you might want to cache a response before
* modifying some HTTP headers, or on the contrary after modifying
* those headers.
*/
/* does not need to be locked because it's in the "hot" list,
* copy the headers */
if (shctx_row_data_append(shctx, first, NULL, (unsigned char *)ci_head(&s->res), msg->sov) < 0)
goto out;
/* register the buffer in the filter ctx for filling it with data*/
if (!LIST_ISEMPTY(&s->strm_flt.filters)) {
list_for_each_entry(filter, &s->strm_flt.filters, list) {
if (filter->config->id == cache_store_flt_id &&
filter->config->conf == rule->arg.act.p[0]) {
if (filter->ctx) {
struct cache_st *cache_ctx = filter->ctx;
struct cache_entry *old;
cache_ctx->first_block = first;
object->eb.key = (*(unsigned int *)&txn->cache_hash);
memcpy(object->hash, txn->cache_hash, sizeof(object->hash));
/* Insert the node later on caching success */
shctx_lock(shctx);
old = entry_exist(cache, txn->cache_hash);
if (old) {
eb32_delete(&old->eb);
old->eb.key = 0;
}
shctx_unlock(shctx);
/* store latest value and expiration time */
object->latest_validation = now.tv_sec;
object->expire = now.tv_sec + http_calc_maxage(s, cache);
}
return ACT_RET_CONT;
}
}
}
out:
/* if does not cache */
if (first) {
shctx_lock(shctx);
first->len = 0;
object->eb.key = 0;
shctx_row_dec_hot(shctx, first);
shctx_unlock(shctx);
}
return ACT_RET_CONT;
}
#define HTTP_CACHE_INIT 0 /* Initial state. */
#define HTTP_CACHE_HEADER 1 /* Cache entry headers forwarded. */
#define HTTP_CACHE_FWD 2 /* Cache entry completely forwarded. */
#define HTTP_CACHE_END 3 /* Cache entry treatment terminated. */
static void http_cache_applet_release(struct appctx *appctx)
{
struct cache *cache = (struct cache *)appctx->rule->arg.act.p[0];
struct cache_entry *cache_ptr = appctx->ctx.cache.entry;
struct shared_block *first = block_ptr(cache_ptr);
shctx_lock(shctx_ptr(cache));
shctx_row_dec_hot(shctx_ptr(cache), first);
shctx_unlock(shctx_ptr(cache));
}
/*
* Append an "Age" header into <chn> channel for this <ce> cache entry.
* This is the responsability of the caller to insure there is enough
* data in the channel.
*
* Returns the number of bytes inserted if succeeded, 0 if failed.
*/
static int cache_channel_append_age_header(struct cache_entry *ce, struct channel *chn)
{
unsigned int age;
age = MAX(0, (int)(now.tv_sec - ce->latest_validation)) + ce->age;
if (unlikely(age > CACHE_ENTRY_MAX_AGE))
age = CACHE_ENTRY_MAX_AGE;
chunk_reset(&trash);
chunk_printf(&trash, "Age: %u", age);
return ci_insert_line2(chn, ce->eoh, trash.area, trash.data);
}
static int cache_channel_row_data_get(struct appctx *appctx, int len)
{
int ret, total;
struct stream_interface *si = appctx->owner;
struct channel *res = si_ic(si);
struct cache *cache = (struct cache *)appctx->rule->arg.act.p[0];
struct shared_context *shctx = shctx_ptr(cache);
struct cache_entry *cache_ptr = appctx->ctx.cache.entry;
struct shared_block *blk, *next = appctx->ctx.cache.next;
int offset;
total = 0;
offset = 0;
if (!next) {
offset = sizeof(struct cache_entry);
next = block_ptr(cache_ptr);
}
blk = next;
list_for_each_entry_from(blk, &shctx->hot, list) {
int sz;
if (len <= 0)
break;
sz = MIN(len, shctx->block_size - offset);
ret = ci_putblk(res, (const char *)blk->data + offset, sz);
if (unlikely(offset))
offset = 0;
if (ret <= 0) {
if (ret == -3 || ret == -1) {
si_cant_put(si);
break;
}
return -1;
}
total += sz;
len -= sz;
}
appctx->ctx.cache.next = blk;
return total;
}
static void http_cache_io_handler(struct appctx *appctx)
{
struct stream_interface *si = appctx->owner;
struct channel *res = si_ic(si);
struct cache_entry *cache_ptr = appctx->ctx.cache.entry;
struct shared_block *first = block_ptr(cache_ptr);
int *sent = &appctx->ctx.cache.sent;
if (unlikely(si->state == SI_ST_DIS || si->state == SI_ST_CLO))
goto out;
/* Check if the input buffer is avalaible. */
if (res->buf.size == 0) {
/* buf.size==0 means we failed to get a buffer and were
* already subscribed to a wait list to get a buffer.
*/
goto out;
}
if (res->flags & (CF_SHUTW|CF_SHUTW_NOW))
appctx->st0 = HTTP_CACHE_END;
/* buffer are aligned there, should be fine */
if (appctx->st0 == HTTP_CACHE_HEADER || appctx->st0 == HTTP_CACHE_INIT) {
int len = first->len - *sent - sizeof(struct cache_entry);
if (len > 0) {
int ret;
ret = cache_channel_row_data_get(appctx, len);
if (ret == -1)
appctx->st0 = HTTP_CACHE_END;
else
*sent += ret;
if (appctx->st0 == HTTP_CACHE_INIT && *sent > cache_ptr->eoh &&
cache_channel_append_age_header(cache_ptr, res))
appctx->st0 = HTTP_CACHE_HEADER;
}
else {
*sent = 0;
appctx->st0 = HTTP_CACHE_FWD;
}
}
if (appctx->st0 == HTTP_CACHE_FWD) {
/* eat the whole request */
co_skip(si_oc(si), co_data(si_oc(si))); // NOTE: when disabled does not repport the correct status code
res->flags |= CF_READ_NULL;
si_shutr(si);
}
if ((res->flags & CF_SHUTR) && (si->state == SI_ST_EST))
si_shutw(si);
out:
;
}
enum act_parse_ret parse_cache_store(const char **args, int *orig_arg, struct proxy *proxy,
struct act_rule *rule, char **err)
{
struct flt_conf *fconf;
int cur_arg = *orig_arg;
rule->action = ACT_CUSTOM;
rule->action_ptr = http_action_store_cache;
if (!*args[cur_arg] || strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
memprintf(err, "expects a cache name");
return ACT_RET_PRS_ERR;
}
/* check if a cache filter was already registered with this cache
* name, if that's the case, must use it. */
list_for_each_entry(fconf, &proxy->filter_configs, list) {
if (fconf->id == cache_store_flt_id && !strcmp((char *)fconf->conf, args[cur_arg])) {
rule->arg.act.p[0] = fconf->conf;
(*orig_arg)++;
/* filter already registered */
return ACT_RET_PRS_OK;
}
}
rule->arg.act.p[0] = strdup(args[cur_arg]);
if (!rule->arg.act.p[0]) {
ha_alert("config: %s '%s': out of memory\n", proxy_type_str(proxy), proxy->id);
err++;
goto err;
}
/* register a filter to fill the cache buffer */
fconf = calloc(1, sizeof(*fconf));
if (!fconf) {
ha_alert("config: %s '%s': out of memory\n",
proxy_type_str(proxy), proxy->id);
err++;
goto err;
}
fconf->id = cache_store_flt_id;
fconf->conf = rule->arg.act.p[0]; /* store the proxy name */
fconf->ops = &cache_ops;
LIST_ADDQ(&proxy->filter_configs, &fconf->list);
(*orig_arg)++;
return ACT_RET_PRS_OK;
err:
return ACT_RET_PRS_ERR;
}
/* This produces a sha1 hash of the concatenation of the first
* occurrence of the Host header followed by the path component if it
* begins with a slash ('/'). */
int sha1_hosturi(struct http_txn *txn)
{
struct hdr_ctx ctx;
blk_SHA_CTX sha1_ctx;
struct buffer *trash;
char *path;
char *end;
trash = get_trash_chunk();
/* retrive the host */
ctx.idx = 0;
if (!http_find_header2("Host", 4, ci_head(txn->req.chn), &txn->hdr_idx, &ctx))
return 0;
chunk_strncat(trash, ctx.line + ctx.val, ctx.vlen);
/* now retrieve the path */
end = ci_head(txn->req.chn) + txn->req.sl.rq.u + txn->req.sl.rq.u_l;
path = http_txn_get_path(txn);
if (!path)
return 0;
chunk_strncat(trash, path, end - path);
/* hash everything */
blk_SHA1_Init(&sha1_ctx);
blk_SHA1_Update(&sha1_ctx, trash->area, trash->data);
blk_SHA1_Final((unsigned char *)txn->cache_hash, &sha1_ctx);
return 1;
}
enum act_return http_action_req_cache_use(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
struct cache_entry *res;
struct cache *cache = (struct cache *)rule->arg.act.p[0];
check_request_for_cacheability(s, &s->req);
if ((s->txn->flags & (TX_CACHE_IGNORE|TX_CACHEABLE)) == TX_CACHE_IGNORE)
return ACT_RET_CONT;
if (!sha1_hosturi(s->txn))
return ACT_RET_CONT;
if (s->txn->flags & TX_CACHE_IGNORE)
return ACT_RET_CONT;
shctx_lock(shctx_ptr(cache));
res = entry_exist(cache, s->txn->cache_hash);
if (res) {
struct appctx *appctx;
shctx_row_inc_hot(shctx_ptr(cache), block_ptr(res));
shctx_unlock(shctx_ptr(cache));
s->target = &http_cache_applet.obj_type;
if ((appctx = stream_int_register_handler(&s->si[1], objt_applet(s->target)))) {
appctx->st0 = HTTP_CACHE_INIT;
appctx->rule = rule;
appctx->ctx.cache.entry = res;
appctx->ctx.cache.next = NULL;
appctx->ctx.cache.sent = 0;
return ACT_RET_CONT;
} else {
shctx_lock(shctx_ptr(cache));
shctx_row_dec_hot(shctx_ptr(cache), block_ptr(res));
shctx_unlock(shctx_ptr(cache));
return ACT_RET_YIELD;
}
}
shctx_unlock(shctx_ptr(cache));
return ACT_RET_CONT;
}
enum act_parse_ret parse_cache_use(const char **args, int *orig_arg, struct proxy *proxy,
struct act_rule *rule, char **err)
{
int cur_arg = *orig_arg;
rule->action = ACT_CUSTOM;
rule->action_ptr = http_action_req_cache_use;
if (!*args[cur_arg] || strcmp(args[cur_arg], "if") == 0 || strcmp(args[cur_arg], "unless") == 0) {
memprintf(err, "expects a cache name");
return ACT_RET_PRS_ERR;
}
rule->arg.act.p[0] = strdup(args[cur_arg]);
if (!rule->arg.act.p[0]) {
ha_alert("config: %s '%s': out of memory\n", proxy_type_str(proxy), proxy->id);
err++;
goto err;
}
(*orig_arg)++;
return ACT_RET_PRS_OK;
err:
return ACT_RET_PRS_ERR;
}
int cfg_parse_cache(const char *file, int linenum, char **args, int kwm)
{
int err_code = 0;
if (strcmp(args[0], "cache") == 0) { /* new cache section */
if (!*args[1]) {
ha_alert("parsing [%s:%d] : '%s' expects an <id> argument\n",
file, linenum, args[0]);
err_code |= ERR_ALERT | ERR_ABORT;
goto out;
}
if (alertif_too_many_args(1, file, linenum, args, &err_code)) {
err_code |= ERR_ABORT;
goto out;
}
if (tmp_cache_config == NULL) {
tmp_cache_config = calloc(1, sizeof(*tmp_cache_config));
if (!tmp_cache_config) {
ha_alert("parsing [%s:%d]: out of memory.\n", file, linenum);
err_code |= ERR_ALERT | ERR_ABORT;
goto out;
}
strlcpy2(tmp_cache_config->id, args[1], 33);
if (strlen(args[1]) > 32) {
ha_warning("parsing [%s:%d]: cache id is limited to 32 characters, truncate to '%s'.\n",
file, linenum, tmp_cache_config->id);
err_code |= ERR_WARN;
}
tmp_cache_config->maxage = 60;
tmp_cache_config->maxblocks = 0;
tmp_cache_config->maxobjsz = 0;
}
} else if (strcmp(args[0], "total-max-size") == 0) {
unsigned long int maxsize;
char *err;
if (alertif_too_many_args(1, file, linenum, args, &err_code)) {
err_code |= ERR_ABORT;
goto out;
}
maxsize = strtoul(args[1], &err, 10);
if (err == args[1] || *err != '\0') {
ha_warning("parsing [%s:%d]: total-max-size wrong value '%s'\n",
file, linenum, args[1]);
err_code |= ERR_ABORT;
goto out;
}
if (maxsize > (UINT_MAX >> 20)) {
ha_warning("parsing [%s:%d]: \"total-max-size\" (%s) must not be greater than %u\n",
file, linenum, args[1], UINT_MAX >> 20);
err_code |= ERR_ABORT;
goto out;
}
/* size in megabytes */
maxsize *= 1024 * 1024 / CACHE_BLOCKSIZE;
tmp_cache_config->maxblocks = maxsize;
} else if (strcmp(args[0], "max-age") == 0) {
if (alertif_too_many_args(1, file, linenum, args, &err_code)) {
err_code |= ERR_ABORT;
goto out;
}
if (!*args[1]) {
ha_warning("parsing [%s:%d]: '%s' expects an age parameter in seconds.\n",
file, linenum, args[0]);
err_code |= ERR_WARN;
}
tmp_cache_config->maxage = atoi(args[1]);
} else if (strcmp(args[0], "max-object-size") == 0) {
unsigned int maxobjsz;
char *err;
if (alertif_too_many_args(1, file, linenum, args, &err_code)) {
err_code |= ERR_ABORT;
goto out;
}
if (!*args[1]) {
ha_warning("parsing [%s:%d]: '%s' expects a maximum file size parameter in bytes.\n",
file, linenum, args[0]);
err_code |= ERR_WARN;
}
maxobjsz = strtoul(args[1], &err, 10);
if (err == args[1] || *err != '\0') {
ha_warning("parsing [%s:%d]: max-object-size wrong value '%s'\n",
file, linenum, args[1]);
err_code |= ERR_ABORT;
goto out;
}
tmp_cache_config->maxobjsz = maxobjsz;
}
else if (*args[0] != 0) {
ha_alert("parsing [%s:%d] : unknown keyword '%s' in 'cache' section\n", file, linenum, args[0]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
out:
return err_code;
}
/* once the cache section is parsed */
int cfg_post_parse_section_cache()
{
struct shared_context *shctx;
int err_code = 0;
int ret_shctx;
if (tmp_cache_config) {
struct cache *cache;
if (tmp_cache_config->maxblocks <= 0) {
ha_alert("Size not specified for cache '%s'\n", tmp_cache_config->id);
err_code |= ERR_FATAL | ERR_ALERT;
goto out;
}
if (!tmp_cache_config->maxobjsz) {
/* Default max. file size is a 256th of the cache size. */
tmp_cache_config->maxobjsz =
(tmp_cache_config->maxblocks * CACHE_BLOCKSIZE) >> 8;
}
else if (tmp_cache_config->maxobjsz > tmp_cache_config->maxblocks * CACHE_BLOCKSIZE / 2) {
ha_alert("\"max-object-size\" is limited to an half of \"total-max-size\" => %u\n", tmp_cache_config->maxblocks * CACHE_BLOCKSIZE / 2);
err_code |= ERR_FATAL | ERR_ALERT;
goto out;
}
ret_shctx = shctx_init(&shctx, tmp_cache_config->maxblocks, CACHE_BLOCKSIZE,
tmp_cache_config->maxobjsz, sizeof(struct cache), 1);
if (ret_shctx <= 0) {
if (ret_shctx == SHCTX_E_INIT_LOCK)
ha_alert("Unable to initialize the lock for the cache.\n");
else
ha_alert("Unable to allocate cache.\n");
err_code |= ERR_FATAL | ERR_ALERT;
goto out;
}
shctx->free_block = cache_free_blocks;
memcpy(shctx->data, tmp_cache_config, sizeof(struct cache));
cache = (struct cache *)shctx->data;
cache->entries = EB_ROOT_UNIQUE;
LIST_ADDQ(&caches, &cache->list);
}
out:
free(tmp_cache_config);
tmp_cache_config = NULL;
return err_code;
}
/*
* Resolve the cache name to a pointer once the file is completely read.
*/
int cfg_cache_postparser()
{
struct act_rule *hresrule, *hrqrule;
void *cache_ptr;
struct cache *cache;
struct proxy *curproxy = NULL;
int err = 0;
struct flt_conf *fconf;
for (curproxy = proxies_list; curproxy; curproxy = curproxy->next) {
/* resolve the http response cache name to a ptr in the action rule */
list_for_each_entry(hresrule, &curproxy->http_res_rules, list) {
if (hresrule->action != ACT_CUSTOM ||
hresrule->action_ptr != http_action_store_cache)
continue;
cache_ptr = hresrule->arg.act.p[0];
list_for_each_entry(cache, &caches, list) {
if (!strcmp(cache->id, cache_ptr)) {
/* don't free there, it's still used in the filter conf */
cache_ptr = cache;
break;
}
}
if (cache_ptr == hresrule->arg.act.p[0]) {
ha_alert("Proxy '%s': unable to find the cache '%s' referenced by http-response cache-store rule.\n",
curproxy->id, (char *)hresrule->arg.act.p[0]);
err++;
}
hresrule->arg.act.p[0] = cache_ptr;
}
/* resolve the http request cache name to a ptr in the action rule */
list_for_each_entry(hrqrule, &curproxy->http_req_rules, list) {
if (hrqrule->action != ACT_CUSTOM ||
hrqrule->action_ptr != http_action_req_cache_use)
continue;
cache_ptr = hrqrule->arg.act.p[0];
list_for_each_entry(cache, &caches, list) {
if (!strcmp(cache->id, cache_ptr)) {
free(cache_ptr);
cache_ptr = cache;
break;
}
}
if (cache_ptr == hrqrule->arg.act.p[0]) {
ha_alert("Proxy '%s': unable to find the cache '%s' referenced by http-request cache-use rule.\n",
curproxy->id, (char *)hrqrule->arg.act.p[0]);
err++;
}
hrqrule->arg.act.p[0] = cache_ptr;
}
/* resolve the cache name to a ptr in the filter config */
list_for_each_entry(fconf, &curproxy->filter_configs, list) {
if (fconf->id != cache_store_flt_id)
continue;
cache_ptr = fconf->conf;
list_for_each_entry(cache, &caches, list) {
if (!strcmp(cache->id, cache_ptr)) {
/* there can be only one filter per cache, so we free it there */
free(cache_ptr);
cache_ptr = cache;
break;
}
}
if (cache_ptr == fconf->conf) {
ha_alert("Proxy '%s': unable to find the cache '%s' referenced by the filter 'cache'.\n",
curproxy->id, (char *)fconf->conf);
err++;
}
fconf->conf = cache_ptr;
}
}
return err;
}
struct flt_ops cache_ops = {
.init = cache_store_init,
/* Handle channels activity */
.channel_start_analyze = cache_store_chn_start_analyze,
.channel_end_analyze = cache_store_chn_end_analyze,
/* Filter HTTP requests and responses */
.http_headers = cache_store_http_headers,
.http_end = cache_store_http_end,
.http_forward_data = cache_store_http_forward_data,
};
static int cli_parse_show_cache(char **args, char *payload, struct appctx *appctx, void *private)
{
if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
return 1;
return 0;
}
static int cli_io_handler_show_cache(struct appctx *appctx)
{
struct cache* cache = appctx->ctx.cli.p0;
struct stream_interface *si = appctx->owner;
if (cache == NULL) {
cache = LIST_ELEM((caches).n, typeof(struct cache *), list);
}
list_for_each_entry_from(cache, &caches, list) {
struct eb32_node *node = NULL;
unsigned int next_key;
struct cache_entry *entry;
next_key = appctx->ctx.cli.i0;
if (!next_key) {
chunk_printf(&trash, "%p: %s (shctx:%p, available blocks:%d)\n", cache, cache->id, shctx_ptr(cache), shctx_ptr(cache)->nbav);
if (ci_putchk(si_ic(si), &trash) == -1) {
si_cant_put(si);
return 0;
}
}
appctx->ctx.cli.p0 = cache;
while (1) {
shctx_lock(shctx_ptr(cache));
node = eb32_lookup_ge(&cache->entries, next_key);
if (!node) {
shctx_unlock(shctx_ptr(cache));
appctx->ctx.cli.i0 = 0;
break;
}
entry = container_of(node, struct cache_entry, eb);
chunk_printf(&trash, "%p hash:%u size:%u (%u blocks), refcount:%u, expire:%d\n", entry, (*(unsigned int *)entry->hash), block_ptr(entry)->len, block_ptr(entry)->block_count, block_ptr(entry)->refcount, entry->expire - (int)now.tv_sec);
next_key = node->key + 1;
appctx->ctx.cli.i0 = next_key;
shctx_unlock(shctx_ptr(cache));
if (ci_putchk(si_ic(si), &trash) == -1) {
si_cant_put(si);
return 0;
}
}
}
return 1;
}
static struct cli_kw_list cli_kws = {{},{
{ { "show", "cache", NULL }, "show cache : show cache status", cli_parse_show_cache, cli_io_handler_show_cache, NULL, NULL },
{{},}
}};
static struct action_kw_list http_res_actions = {
.kw = {
{ "cache-store", parse_cache_store },
{ NULL, NULL }
}
};
static struct action_kw_list http_req_actions = {
.kw = {
{ "cache-use", parse_cache_use },
{ NULL, NULL }
}
};
struct applet http_cache_applet = {
.obj_type = OBJ_TYPE_APPLET,
.name = "<CACHE>", /* used for logging */
.fct = http_cache_io_handler,
.release = http_cache_applet_release,
};
__attribute__((constructor))
static void __cache_init(void)
{
cfg_register_section("cache", cfg_parse_cache, cfg_post_parse_section_cache);
cfg_register_postparser("cache", cfg_cache_postparser);
cli_register_kw(&cli_kws);
http_res_keywords_register(&http_res_actions);
http_req_keywords_register(&http_req_actions);
pool_head_cache_st = create_pool("cache_st", sizeof(struct cache_st), MEM_F_SHARED);
}