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proto_text.c
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proto_text.c
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Functions for handling the text related protocols, original and meta.
*/
#include "memcached.h"
#include "proto_text.h"
// FIXME: only for process_proxy_stats()
// - some better/different structure for stats subcommands
// would remove this abstraction leak.
#include "proto_proxy.h"
#include "authfile.h"
#include "storage.h"
#include "base64.h"
#ifdef TLS
#include "tls.h"
#endif
#include <string.h>
#include <stdlib.h>
#define META_SPACE(p) { \
*p = ' '; \
p++; \
}
#define META_CHAR(p, c) { \
*p = ' '; \
*(p+1) = c; \
p += 2; \
}
// NOTE: being a little casual with the write buffer.
// the buffer needs to be sized that the longest possible meta response will
// fit. Here we allow the key to fill up to half the write buffer, in case
// something terrible has gone wrong.
#define META_KEY(p, key, nkey, bin) { \
META_CHAR(p, 'k'); \
if (!bin) { \
memcpy(p, key, nkey); \
p += nkey; \
} else { \
p += base64_encode((unsigned char *) key, nkey, (unsigned char *)p, WRITE_BUFFER_SIZE / 2); \
*p = ' '; \
*(p+1) = 'b'; \
p += 2; \
} \
}
typedef struct token_s {
char *value;
size_t length;
} token_t;
static void _finalize_mset(conn *c, enum store_item_type ret) {
mc_resp *resp = c->resp;
item *it = c->item;
conn_set_state(c, conn_new_cmd);
// information about the response line has been stashed in wbuf.
char *p = resp->wbuf + resp->wbytes;
char *end = p; // end of the stashed data portion.
switch (ret) {
case STORED:
if (settings.meta_response_old) {
memcpy(p, "OK", 2);
} else {
memcpy(p, "HD", 2);
}
// Only place noreply is used for meta cmds is a nominal response.
if (c->noreply) {
resp->skip = true;
}
break;
case EXISTS:
memcpy(p, "EX", 2);
break;
case NOT_FOUND:
memcpy(p, "NF", 2);
break;
case NOT_STORED:
memcpy(p, "NS", 2);
break;
default:
c->noreply = false;
out_string(c, "SERVER_ERROR Unhandled storage type.");
return;
}
p += 2;
for (char *fp = resp->wbuf; fp < end; fp++) {
switch (*fp) {
case 'O':
// Copy stashed opaque.
META_SPACE(p);
while (fp < end && *fp != ' ') {
*p = *fp;
p++;
fp++;
}
break;
case 'k':
// Encode the key here instead of earlier to minimize copying.
META_KEY(p, ITEM_key(it), it->nkey, (it->it_flags & ITEM_KEY_BINARY));
break;
case 'c':
// We don't have the CAS until this point, which is why we
// generate this line so late.
META_CHAR(p, 'c');
p = itoa_u64(c->cas, p);
break;
default:
break;
}
}
memcpy(p, "\r\n", 2);
p += 2;
// we're offset into wbuf, but good convention to track wbytes.
resp->wbytes = p - resp->wbuf;
resp_add_iov(resp, end, p - end);
}
/*
* we get here after reading the value in set/add/replace commands. The command
* has been stored in c->cmd, and the item is ready in c->item.
*/
void complete_nread_ascii(conn *c) {
assert(c != NULL);
item *it = c->item;
int comm = c->cmd;
enum store_item_type ret;
bool is_valid = false;
pthread_mutex_lock(&c->thread->stats.mutex);
c->thread->stats.slab_stats[ITEM_clsid(it)].set_cmds++;
pthread_mutex_unlock(&c->thread->stats.mutex);
if ((it->it_flags & ITEM_CHUNKED) == 0) {
if (strncmp(ITEM_data(it) + it->nbytes - 2, "\r\n", 2) == 0) {
is_valid = true;
}
} else {
char buf[2];
/* should point to the final item chunk */
item_chunk *ch = (item_chunk *) c->ritem;
assert(ch->used != 0);
/* :( We need to look at the last two bytes. This could span two
* chunks.
*/
if (ch->used > 1) {
buf[0] = ch->data[ch->used - 2];
buf[1] = ch->data[ch->used - 1];
} else {
assert(ch->prev);
assert(ch->used == 1);
buf[0] = ch->prev->data[ch->prev->used - 1];
buf[1] = ch->data[ch->used - 1];
}
if (strncmp(buf, "\r\n", 2) == 0) {
is_valid = true;
} else {
assert(1 == 0);
}
}
if (!is_valid) {
// metaset mode always returns errors.
if (c->mset_res) {
c->noreply = false;
}
out_string(c, "CLIENT_ERROR bad data chunk");
} else {
ret = store_item(it, comm, c);
#ifdef ENABLE_DTRACE
uint64_t cas = ITEM_get_cas(it);
switch (c->cmd) {
case NREAD_ADD:
MEMCACHED_COMMAND_ADD(c->sfd, ITEM_key(it), it->nkey,
(ret == 1) ? it->nbytes : -1, cas);
break;
case NREAD_REPLACE:
MEMCACHED_COMMAND_REPLACE(c->sfd, ITEM_key(it), it->nkey,
(ret == 1) ? it->nbytes : -1, cas);
break;
case NREAD_APPEND:
MEMCACHED_COMMAND_APPEND(c->sfd, ITEM_key(it), it->nkey,
(ret == 1) ? it->nbytes : -1, cas);
break;
case NREAD_PREPEND:
MEMCACHED_COMMAND_PREPEND(c->sfd, ITEM_key(it), it->nkey,
(ret == 1) ? it->nbytes : -1, cas);
break;
case NREAD_SET:
MEMCACHED_COMMAND_SET(c->sfd, ITEM_key(it), it->nkey,
(ret == 1) ? it->nbytes : -1, cas);
break;
case NREAD_CAS:
MEMCACHED_COMMAND_CAS(c->sfd, ITEM_key(it), it->nkey, it->nbytes,
cas);
break;
}
#endif
if (c->mset_res) {
_finalize_mset(c, ret);
} else {
switch (ret) {
case STORED:
out_string(c, "STORED");
break;
case EXISTS:
out_string(c, "EXISTS");
break;
case NOT_FOUND:
out_string(c, "NOT_FOUND");
break;
case NOT_STORED:
out_string(c, "NOT_STORED");
break;
default:
out_string(c, "SERVER_ERROR Unhandled storage type.");
}
}
}
c->set_stale = false; /* force flag to be off just in case */
c->mset_res = false;
item_remove(c->item); /* release the c->item reference */
c->item = 0;
}
#define COMMAND_TOKEN 0
#define SUBCOMMAND_TOKEN 1
#define KEY_TOKEN 1
#define MAX_TOKENS 24
#define WANT_TOKENS(ntokens, min, max) \
do { \
if ((min != -1 && ntokens < min) || (max != -1 && ntokens > max)) { \
out_string(c, "ERROR"); \
return; \
} \
} while (0)
#define WANT_TOKENS_OR(ntokens, a, b) \
do { \
if (ntokens != a && ntokens != b) { \
out_string(c, "ERROR"); \
return; \
} \
} while (0)
#define WANT_TOKENS_MIN(ntokens, min) \
do { \
if (ntokens < min) { \
out_string(c, "ERROR"); \
return; \
} \
} while (0)
/*
* Tokenize the command string by replacing whitespace with '\0' and update
* the token array tokens with pointer to start of each token and length.
* Returns total number of tokens. The last valid token is the terminal
* token (value points to the first unprocessed character of the string and
* length zero).
*
* Usage example:
*
* while(tokenize_command(command, ncommand, tokens, max_tokens) > 0) {
* for(int ix = 0; tokens[ix].length != 0; ix++) {
* ...
* }
* ncommand = tokens[ix].value - command;
* command = tokens[ix].value;
* }
*/
static size_t tokenize_command(char *command, token_t *tokens, const size_t max_tokens) {
char *s, *e;
size_t ntokens = 0;
assert(command != NULL && tokens != NULL && max_tokens > 1);
size_t len = strlen(command);
unsigned int i = 0;
s = e = command;
for (i = 0; i < len; i++) {
if (*e == ' ') {
if (s != e) {
tokens[ntokens].value = s;
tokens[ntokens].length = e - s;
ntokens++;
*e = '\0';
if (ntokens == max_tokens - 1) {
e++;
s = e; /* so we don't add an extra token */
break;
}
}
s = e + 1;
}
e++;
}
if (s != e) {
tokens[ntokens].value = s;
tokens[ntokens].length = e - s;
ntokens++;
}
/*
* If we scanned the whole string, the terminal value pointer is null,
* otherwise it is the first unprocessed character.
*/
tokens[ntokens].value = *e == '\0' ? NULL : e;
tokens[ntokens].length = 0;
ntokens++;
return ntokens;
}
int try_read_command_asciiauth(conn *c) {
token_t tokens[MAX_TOKENS];
size_t ntokens;
char *cont = NULL;
// TODO: move to another function.
if (!c->sasl_started) {
char *el;
uint32_t size = 0;
// impossible for the auth command to be this short.
if (c->rbytes < 2)
return 0;
el = memchr(c->rcurr, '\n', c->rbytes);
// If no newline after 1k, getting junk data, close out.
if (!el) {
if (c->rbytes > 2048) {
conn_set_state(c, conn_closing);
return 1;
}
return 0;
}
// Looking for: "set foo 0 0 N\r\nuser pass\r\n"
// key, flags, and ttl are ignored. N is used to see if we have the rest.
// so tokenize doesn't walk past into the value.
// it's fine to leave the \r in, as strtoul will stop at it.
*el = '\0';
ntokens = tokenize_command(c->rcurr, tokens, MAX_TOKENS);
// ensure the buffer is consumed.
c->rbytes -= (el - c->rcurr) + 1;
c->rcurr += (el - c->rcurr) + 1;
// final token is a NULL ender, so we have one more than expected.
if (ntokens < 6
|| strcmp(tokens[0].value, "set") != 0
|| !safe_strtoul(tokens[4].value, &size)) {
if (!c->resp) {
if (!resp_start(c)) {
conn_set_state(c, conn_closing);
return 1;
}
}
out_string(c, "CLIENT_ERROR unauthenticated");
return 1;
}
// we don't actually care about the key at all; it can be anything.
// we do care about the size of the remaining read.
c->rlbytes = size + 2;
c->sasl_started = true; // reuse from binprot sasl, but not sasl :)
}
if (c->rbytes < c->rlbytes) {
// need more bytes.
return 0;
}
// Going to respond at this point, so attach a response object.
if (!c->resp) {
if (!resp_start(c)) {
conn_set_state(c, conn_closing);
return 1;
}
}
cont = c->rcurr;
// advance buffer. no matter what we're stopping.
c->rbytes -= c->rlbytes;
c->rcurr += c->rlbytes;
c->sasl_started = false;
// must end with \r\n
// NB: I thought ASCII sets also worked with just \n, but according to
// complete_nread_ascii only \r\n is valid.
if (strncmp(cont + c->rlbytes - 2, "\r\n", 2) != 0) {
out_string(c, "CLIENT_ERROR bad command line termination");
return 1;
}
// payload should be "user pass", so we can use the tokenizer.
cont[c->rlbytes - 2] = '\0';
ntokens = tokenize_command(cont, tokens, MAX_TOKENS);
if (ntokens < 3) {
out_string(c, "CLIENT_ERROR bad authentication token format");
return 1;
}
if (authfile_check(tokens[0].value, tokens[1].value) == 1) {
out_string(c, "STORED");
c->authenticated = true;
c->try_read_command = try_read_command_ascii;
pthread_mutex_lock(&c->thread->stats.mutex);
c->thread->stats.auth_cmds++;
pthread_mutex_unlock(&c->thread->stats.mutex);
} else {
out_string(c, "CLIENT_ERROR authentication failure");
pthread_mutex_lock(&c->thread->stats.mutex);
c->thread->stats.auth_cmds++;
c->thread->stats.auth_errors++;
pthread_mutex_unlock(&c->thread->stats.mutex);
}
return 1;
}
int try_read_command_ascii(conn *c) {
char *el, *cont;
if (c->rbytes == 0)
return 0;
el = memchr(c->rcurr, '\n', c->rbytes);
if (!el) {
if (c->rbytes > 2048) {
/*
* We didn't have a '\n' in the first few k. This _has_ to be a
* large multiget, if not we should just nuke the connection.
*/
char *ptr = c->rcurr;
while (*ptr == ' ') { /* ignore leading whitespaces */
++ptr;
}
if (ptr - c->rcurr > 100 ||
(strncmp(ptr, "get ", 4) && strncmp(ptr, "gets ", 5))) {
conn_set_state(c, conn_closing);
return 1;
}
// ASCII multigets are unbound, so our fixed size rbuf may not
// work for this particular workload... For backcompat we'll use a
// malloc/realloc/free routine just for this.
if (!c->rbuf_malloced) {
if (!rbuf_switch_to_malloc(c)) {
conn_set_state(c, conn_closing);
return 1;
}
}
}
return 0;
}
cont = el + 1;
if ((el - c->rcurr) > 1 && *(el - 1) == '\r') {
el--;
}
*el = '\0';
assert(cont <= (c->rcurr + c->rbytes));
c->last_cmd_time = current_time;
process_command_ascii(c, c->rcurr);
c->rbytes -= (cont - c->rcurr);
c->rcurr = cont;
assert(c->rcurr <= (c->rbuf + c->rsize));
return 1;
}
static inline bool set_noreply_maybe(conn *c, token_t *tokens, size_t ntokens)
{
int noreply_index = ntokens - 2;
/*
NOTE: this function is not the first place where we are going to
send the reply. We could send it instead from process_command()
if the request line has wrong number of tokens. However parsing
malformed line for "noreply" option is not reliable anyway, so
it can't be helped.
*/
if (tokens[noreply_index].value
&& strcmp(tokens[noreply_index].value, "noreply") == 0) {
c->noreply = true;
}
return c->noreply;
}
/* client flags == 0 means use no storage for client flags */
static inline int make_ascii_get_suffix(char *suffix, item *it, bool return_cas, int nbytes) {
char *p = suffix;
*p = ' ';
p++;
if (FLAGS_SIZE(it) == 0) {
*p = '0';
p++;
} else {
p = itoa_u32(*((uint32_t *) ITEM_suffix(it)), p);
}
*p = ' ';
p = itoa_u32(nbytes-2, p+1);
if (return_cas) {
*p = ' ';
p = itoa_u64(ITEM_get_cas(it), p+1);
}
*p = '\r';
*(p+1) = '\n';
*(p+2) = '\0';
return (p - suffix) + 2;
}
/* ntokens is overwritten here... shrug.. */
static inline void process_get_command(conn *c, token_t *tokens, size_t ntokens, bool return_cas, bool should_touch) {
char *key;
size_t nkey;
item *it;
token_t *key_token = &tokens[KEY_TOKEN];
int32_t exptime_int = 0;
rel_time_t exptime = 0;
bool fail_length = false;
assert(c != NULL);
mc_resp *resp = c->resp;
if (should_touch) {
// For get and touch commands, use first token as exptime
if (!safe_strtol(tokens[1].value, &exptime_int)) {
out_string(c, "CLIENT_ERROR invalid exptime argument");
return;
}
key_token++;
exptime = realtime(EXPTIME_TO_POSITIVE_TIME(exptime_int));
}
do {
while(key_token->length != 0) {
bool overflow; // not used here.
key = key_token->value;
nkey = key_token->length;
if (nkey > KEY_MAX_LENGTH) {
fail_length = true;
goto stop;
}
it = limited_get(key, nkey, c, exptime, should_touch, DO_UPDATE, &overflow);
if (settings.detail_enabled) {
stats_prefix_record_get(key, nkey, NULL != it);
}
if (it) {
/*
* Construct the response. Each hit adds three elements to the
* outgoing data list:
* "VALUE "
* key
* " " + flags + " " + data length + "\r\n" + data (with \r\n)
*/
{
MEMCACHED_COMMAND_GET(c->sfd, ITEM_key(it), it->nkey,
it->nbytes, ITEM_get_cas(it));
int nbytes = it->nbytes;;
nbytes = it->nbytes;
char *p = resp->wbuf;
memcpy(p, "VALUE ", 6);
p += 6;
memcpy(p, ITEM_key(it), it->nkey);
p += it->nkey;
p += make_ascii_get_suffix(p, it, return_cas, nbytes);
resp_add_iov(resp, resp->wbuf, p - resp->wbuf);
#ifdef EXTSTORE
if (it->it_flags & ITEM_HDR) {
if (storage_get_item(c, it, resp) != 0) {
pthread_mutex_lock(&c->thread->stats.mutex);
c->thread->stats.get_oom_extstore++;
pthread_mutex_unlock(&c->thread->stats.mutex);
item_remove(it);
goto stop;
}
} else if ((it->it_flags & ITEM_CHUNKED) == 0) {
resp_add_iov(resp, ITEM_data(it), it->nbytes);
} else {
resp_add_chunked_iov(resp, it, it->nbytes);
}
#else
if ((it->it_flags & ITEM_CHUNKED) == 0) {
resp_add_iov(resp, ITEM_data(it), it->nbytes);
} else {
resp_add_chunked_iov(resp, it, it->nbytes);
}
#endif
}
if (settings.verbose > 1) {
int ii;
fprintf(stderr, ">%d sending key ", c->sfd);
for (ii = 0; ii < it->nkey; ++ii) {
fprintf(stderr, "%c", key[ii]);
}
fprintf(stderr, "\n");
}
/* item_get() has incremented it->refcount for us */
pthread_mutex_lock(&c->thread->stats.mutex);
if (should_touch) {
c->thread->stats.touch_cmds++;
c->thread->stats.slab_stats[ITEM_clsid(it)].touch_hits++;
} else {
c->thread->stats.lru_hits[it->slabs_clsid]++;
c->thread->stats.get_cmds++;
}
pthread_mutex_unlock(&c->thread->stats.mutex);
#ifdef EXTSTORE
/* If ITEM_HDR, an io_wrap owns the reference. */
if ((it->it_flags & ITEM_HDR) == 0) {
resp->item = it;
}
#else
resp->item = it;
#endif
} else {
pthread_mutex_lock(&c->thread->stats.mutex);
if (should_touch) {
c->thread->stats.touch_cmds++;
c->thread->stats.touch_misses++;
} else {
c->thread->stats.get_misses++;
c->thread->stats.get_cmds++;
}
MEMCACHED_COMMAND_GET(c->sfd, key, nkey, -1, 0);
pthread_mutex_unlock(&c->thread->stats.mutex);
}
key_token++;
if (key_token->length != 0) {
if (!resp_start(c)) {
goto stop;
}
resp = c->resp;
}
}
/*
* If the command string hasn't been fully processed, get the next set
* of tokens.
*/
if (key_token->value != NULL) {
ntokens = tokenize_command(key_token->value, tokens, MAX_TOKENS);
key_token = tokens;
if (!resp_start(c)) {
goto stop;
}
resp = c->resp;
}
} while(key_token->value != NULL);
stop:
if (settings.verbose > 1)
fprintf(stderr, ">%d END\n", c->sfd);
/*
If the loop was terminated because of out-of-memory, it is not
reliable to add END\r\n to the buffer, because it might not end
in \r\n. So we send SERVER_ERROR instead.
*/
if (key_token->value != NULL) {
// Kill any stacked responses we had.
conn_release_items(c);
// Start a new response object for the error message.
if (!resp_start(c)) {
// severe out of memory error.
conn_set_state(c, conn_closing);
return;
}
if (fail_length) {
out_string(c, "CLIENT_ERROR bad command line format");
} else {
out_of_memory(c, "SERVER_ERROR out of memory writing get response");
}
} else {
// Tag the end token onto the most recent response object.
resp_add_iov(resp, "END\r\n", 5);
conn_set_state(c, conn_mwrite);
}
}
inline static void process_stats_detail(conn *c, const char *command) {
assert(c != NULL);
if (strcmp(command, "on") == 0) {
settings.detail_enabled = 1;
out_string(c, "OK");
}
else if (strcmp(command, "off") == 0) {
settings.detail_enabled = 0;
out_string(c, "OK");
}
else if (strcmp(command, "dump") == 0) {
int len;
char *stats = stats_prefix_dump(&len);
write_and_free(c, stats, len);
}
else {
out_string(c, "CLIENT_ERROR usage: stats detail on|off|dump");
}
}
static void process_stat(conn *c, token_t *tokens, const size_t ntokens) {
const char *subcommand = tokens[SUBCOMMAND_TOKEN].value;
assert(c != NULL);
if (ntokens < 2) {
out_string(c, "CLIENT_ERROR bad command line");
return;
}
if (ntokens == 2) {
server_stats(&append_stats, c);
(void)get_stats(NULL, 0, &append_stats, c);
} else if (strcmp(subcommand, "reset") == 0) {
stats_reset();
out_string(c, "RESET");
return;
} else if (strcmp(subcommand, "detail") == 0) {
/* NOTE: how to tackle detail with binary? */
if (ntokens < 4)
process_stats_detail(c, ""); /* outputs the error message */
else
process_stats_detail(c, tokens[2].value);
/* Output already generated */
return;
} else if (strcmp(subcommand, "settings") == 0) {
process_stat_settings(&append_stats, c);
} else if (strcmp(subcommand, "cachedump") == 0) {
char *buf;
unsigned int bytes, id, limit = 0;
if (!settings.dump_enabled) {
out_string(c, "CLIENT_ERROR stats cachedump not allowed");
return;
}
if (ntokens < 5) {
out_string(c, "CLIENT_ERROR bad command line");
return;
}
if (!safe_strtoul(tokens[2].value, &id) ||
!safe_strtoul(tokens[3].value, &limit)) {
out_string(c, "CLIENT_ERROR bad command line format");
return;
}
if (id >= MAX_NUMBER_OF_SLAB_CLASSES) {
out_string(c, "CLIENT_ERROR Illegal slab id");
return;
}
buf = item_cachedump(id, limit, &bytes);
write_and_free(c, buf, bytes);
return;
} else if (strcmp(subcommand, "conns") == 0) {
process_stats_conns(&append_stats, c);
#ifdef EXTSTORE
} else if (strcmp(subcommand, "extstore") == 0) {
process_extstore_stats(&append_stats, c);
#endif
#ifdef PROXY
} else if (strcmp(subcommand, "proxy") == 0) {
process_proxy_stats(&append_stats, c);
#endif
} else {
/* getting here means that the subcommand is either engine specific or
is invalid. query the engine and see. */
if (get_stats(subcommand, strlen(subcommand), &append_stats, c)) {
if (c->stats.buffer == NULL) {
out_of_memory(c, "SERVER_ERROR out of memory writing stats");
} else {
write_and_free(c, c->stats.buffer, c->stats.offset);
c->stats.buffer = NULL;
}
} else {
out_string(c, "ERROR");
}
return;
}
/* append terminator and start the transfer */
append_stats(NULL, 0, NULL, 0, c);
if (c->stats.buffer == NULL) {
out_of_memory(c, "SERVER_ERROR out of memory writing stats");
} else {
write_and_free(c, c->stats.buffer, c->stats.offset);
c->stats.buffer = NULL;
}
}
// slow snprintf for debugging purposes.
static void process_meta_command(conn *c, token_t *tokens, const size_t ntokens) {
assert(c != NULL);
if (ntokens < 3 || tokens[KEY_TOKEN].length > KEY_MAX_LENGTH) {
out_string(c, "CLIENT_ERROR bad command line format");
return;
}
char *key = tokens[KEY_TOKEN].value;
size_t nkey = tokens[KEY_TOKEN].length;
if (ntokens >= 4 && tokens[2].length == 1 && tokens[2].value[0] == 'b') {
size_t ret = base64_decode((unsigned char *)key, nkey,
(unsigned char *)key, nkey);
if (ret == 0) {
// failed to decode.
out_string(c, "CLIENT_ERROR bad command line format");
return;
}
nkey = ret;
}
bool overflow; // not used here.
item *it = limited_get(key, nkey, c, 0, false, DONT_UPDATE, &overflow);
if (it) {
mc_resp *resp = c->resp;
size_t total = 0;
size_t ret;
// similar to out_string().
memcpy(resp->wbuf, "ME ", 3);
total += 3;
if (it->it_flags & ITEM_KEY_BINARY) {
// re-encode from memory rather than copy the original key;
// to help give confidence that what in memory is what we asked
// for.
total += base64_encode((unsigned char *) ITEM_key(it), it->nkey, (unsigned char *)resp->wbuf + total, WRITE_BUFFER_SIZE - total);
} else {
memcpy(resp->wbuf + total, ITEM_key(it), it->nkey);
total += it->nkey;
}
resp->wbuf[total] = ' ';
total++;
ret = snprintf(resp->wbuf + total, WRITE_BUFFER_SIZE - (it->nkey + 12),
"exp=%d la=%llu cas=%llu fetch=%s cls=%u size=%lu\r\n",
(it->exptime == 0) ? -1 : (current_time - it->exptime),
(unsigned long long)(current_time - it->time),
(unsigned long long)ITEM_get_cas(it),
(it->it_flags & ITEM_FETCHED) ? "yes" : "no",
ITEM_clsid(it),
(unsigned long) ITEM_ntotal(it));
item_remove(it);
resp->wbytes = total + ret;
resp_add_iov(resp, resp->wbuf, resp->wbytes);
conn_set_state(c, conn_new_cmd);
} else {
out_string(c, "EN");
}
pthread_mutex_lock(&c->thread->stats.mutex);
c->thread->stats.meta_cmds++;
pthread_mutex_unlock(&c->thread->stats.mutex);
}
#define MFLAG_MAX_OPT_LENGTH 20
#define MFLAG_MAX_OPAQUE_LENGTH 32
struct _meta_flags {
unsigned int has_error :1; // flipped if we found an error during parsing.
unsigned int no_update :1;
unsigned int locked :1;
unsigned int vivify :1;
unsigned int la :1;
unsigned int hit :1;
unsigned int value :1;
unsigned int set_stale :1;
unsigned int no_reply :1;
unsigned int has_cas :1;
unsigned int new_ttl :1;
unsigned int key_binary:1;
char mode; // single character mode switch, common to ms/ma
rel_time_t exptime;
rel_time_t autoviv_exptime;
rel_time_t recache_time;
uint32_t client_flags;
uint64_t req_cas_id;
uint64_t delta; // ma
uint64_t initial; // ma
};
static int _meta_flag_preparse(token_t *tokens, const size_t start,
struct _meta_flags *of, char **errstr) {
unsigned int i;
size_t ret;
int32_t tmp_int;
uint8_t seen[127] = {0};
// Start just past the key token. Look at first character of each token.
for (i = start; tokens[i].length != 0; i++) {
uint8_t o = (uint8_t)tokens[i].value[0];
// zero out repeat flags so we don't over-parse for return data.
if (o >= 127 || seen[o] != 0) {
*errstr = "CLIENT_ERROR duplicate flag";
return -1;
}
seen[o] = 1;
switch (o) {
// base64 decode the key in-place, as the binary should always be
// shorter and the conversion code buffers bytes.
case 'b':
ret = base64_decode((unsigned char *)tokens[KEY_TOKEN].value, tokens[KEY_TOKEN].length,
(unsigned char *)tokens[KEY_TOKEN].value, tokens[KEY_TOKEN].length);
if (ret == 0) {
// Failed to decode
*errstr = "CLIENT_ERROR error decoding key";
of->has_error = 1;
}
tokens[KEY_TOKEN].length = ret;
of->key_binary = 1;
break;
/* Negative exptimes can underflow and end up immortal. realtime() will
immediately expire values that are greater than REALTIME_MAXDELTA, but less
than process_started, so lets aim for that. */
case 'N':
of->locked = 1;
of->vivify = 1;
if (!safe_strtol(tokens[i].value+1, &tmp_int)) {
*errstr = "CLIENT_ERROR bad token in command line format";
of->has_error = 1;
} else {
of->autoviv_exptime = realtime(EXPTIME_TO_POSITIVE_TIME(tmp_int));
}
break;
case 'T':
of->locked = 1;
if (!safe_strtol(tokens[i].value+1, &tmp_int)) {
*errstr = "CLIENT_ERROR bad token in command line format";
of->has_error = 1;
} else {
of->exptime = realtime(EXPTIME_TO_POSITIVE_TIME(tmp_int));
of->new_ttl = true;
}
break;
case 'R':
of->locked = 1;
if (!safe_strtol(tokens[i].value+1, &tmp_int)) {
*errstr = "CLIENT_ERROR bad token in command line format";
of->has_error = 1;
} else {
of->recache_time = realtime(EXPTIME_TO_POSITIVE_TIME(tmp_int));
}
break;
case 'l':
of->la = 1;
of->locked = 1; // need locked to delay LRU bump
break;
case 'O':
case 'P':
case 'L':
break;
case 'k': // known but no special handling
case 's':
case 't':
case 'c':
case 'f':
break;
case 'v':
of->value = 1;
break;
case 'h':
of->locked = 1; // need locked to delay LRU bump
break;
case 'u':
of->no_update = 1;