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cproxy_protocol_a2b.c
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cproxy_protocol_a2b.c
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include <assert.h>
#include <math.h>
#include "memcached.h"
#include "cproxy.h"
#include "work.h"
#include "log.h"
// Internal declarations.
//
static protocol_binary_request_noop req_noop = {
.bytes = {0}
};
#define CMD_TOKEN 0
#define KEY_TOKEN 1
#define MAX_TOKENS 9
// A2B means ascii-to-binary (or, ascii upstream and binary downstream).
//
struct A2BSpec {
char *line;
protocol_binary_command cmd;
protocol_binary_command cmdq;
int size; // Number of bytes in request header.
token_t tokens[MAX_TOKENS];
int ntokens;
bool noreply_allowed;
int num_optional; // Number of optional arguments in cmd.
bool broadcast; // True if cmd does scatter/gather.
};
// The a2b_specs are immutable after init.
//
// The arguments are carefully named with unique first characters.
//
struct A2BSpec a2b_specs[] = {
{ .line = "set <key> <flags> <exptime> <bytes> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_SET,
.cmdq = PROTOCOL_BINARY_CMD_SETQ,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_set.message.body) [8 bytes]
.size = sizeof(protocol_binary_request_header) + 8
},
{ .line = "add <key> <flags> <exptime> <bytes> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_ADD,
.cmdq = PROTOCOL_BINARY_CMD_ADDQ,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_add.message.body) [8 bytes]
.size = sizeof(protocol_binary_request_header) + 8
},
{ .line = "replace <key> <flags> <exptime> <bytes> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_REPLACE,
.cmdq = PROTOCOL_BINARY_CMD_REPLACEQ,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_replace.message.body) [8 bytes]
.size = sizeof(protocol_binary_request_header) + 8
},
{ .line = "append <key> <skip_flags> <skip_exptime> <bytes> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_APPEND,
.cmdq = PROTOCOL_BINARY_CMD_APPENDQ,
.size = sizeof(protocol_binary_request_append)
},
{ .line = "prepend <key> <skip_flags> <skip_exptime> <bytes> [noreply]" ,
.cmd = PROTOCOL_BINARY_CMD_PREPEND,
.cmdq = PROTOCOL_BINARY_CMD_PREPENDQ,
.size = sizeof(protocol_binary_request_prepend)
},
{ .line = "cas <key> <flags> <exptime> <bytes> <cas> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_SET,
.cmdq = PROTOCOL_BINARY_CMD_SETQ,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_set.message.body) [8 bytes]
.size = sizeof(protocol_binary_request_header) + 8
},
{ .line = "delete <key> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_DELETE,
.cmdq = PROTOCOL_BINARY_CMD_DELETEQ,
.size = sizeof(protocol_binary_request_delete)
},
{ .line = "incr <key> <value> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_INCREMENT,
.cmdq = PROTOCOL_BINARY_CMD_INCREMENTQ,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_incr.message.body) [20 bytes]
.size = sizeof(protocol_binary_request_header) + 20
},
{ .line = "decr <key> <value> [noreply]",
.cmd = PROTOCOL_BINARY_CMD_DECREMENT,
.cmdq = PROTOCOL_BINARY_CMD_DECREMENTQ,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_decr.message.body) [20 bytes]
.size = sizeof(protocol_binary_request_header) + 20
},
{ .line = "flush_all [xpiration] [noreply]", // TODO: noreply tricky here.
.cmd = PROTOCOL_BINARY_CMD_FLUSH,
.cmdq = PROTOCOL_BINARY_CMD_FLUSHQ,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_flush.message.body) [4 bytes]
.size = sizeof(protocol_binary_request_header) + 4,
.broadcast = true
},
{ .line = "get <key>*", // Multi-key GET/GETS
.cmd = PROTOCOL_BINARY_CMD_GETKQ,
.cmdq = -1,
.size = sizeof(protocol_binary_request_header)
},
{ .line = "get <key>", // Single-key GET/GETS.
.cmd = PROTOCOL_BINARY_CMD_GETK,
.cmdq = -1,
.size = sizeof(protocol_binary_request_header)
},
{ .line = "stats [args]*",
.cmd = PROTOCOL_BINARY_CMD_STAT,
.cmdq = -1,
.size = sizeof(protocol_binary_request_stats),
.broadcast = true
},
{ .line = "version",
.cmd = PROTOCOL_BINARY_CMD_VERSION,
.cmdq = -1,
.size = sizeof(protocol_binary_request_version)
},
{ .line = "getl <key> <xpiration>", // Single-key GETL.
.cmd = PROTOCOL_BINARY_CMD_GETL,
.cmdq = -1,
.size = sizeof(protocol_binary_request_header) + 4
},
{ .line = "unl <key> <cas>", // Single-key UNL.
.cmd = PROTOCOL_BINARY_CMD_UNL,
.cmdq = -1,
.size = sizeof(protocol_binary_request_header)
},
{ .line = "touch <key> <xpiration>",
.cmd = PROTOCOL_BINARY_CMD_TOUCH,
.cmdq = -1,
// The size should be...
// sizeof(protocol_binary_request_header) [24 bytes] +
// sizeof(protocol_binary_request_touch.message.body) [4 bytes]
.size = sizeof(protocol_binary_request_header) + 4,
},
{ .line = 0 } // NULL sentinel.
};
// These are immutable after init.
//
struct A2BSpec *a2b_spec_map[0x100] = {0}; // Lookup table by A2BSpec->cmd.
int a2b_size_max = 0; // Max header + extra frame bytes.
int a2b_fill_request(short cmd,
token_t *cmd_tokens,
int cmd_ntokens,
bool noreply,
protocol_binary_request_header *header,
uint8_t **out_key,
uint16_t *out_keylen,
uint8_t *out_extlen);
bool a2b_fill_request_token(struct A2BSpec *spec,
int cur_token,
token_t *cmd_tokens,
int cmd_ntokens,
protocol_binary_request_header *header,
uint8_t **out_key,
uint16_t *out_keylen,
uint8_t *out_extlen);
void a2b_process_downstream_response(conn *c);
int a2b_multiget_start(conn *c, char *cmd, int cmd_len);
int a2b_multiget_skey(conn *c, char *skey, int skey_len, int vbucket, int key_index);
int a2b_multiget_end(conn *c);
void a2b_set_opaque(conn *c, protocol_binary_request_header *header, bool noreply);
bool a2b_not_my_vbucket(conn *uc, conn *c,
protocol_binary_response_header *header);
void cproxy_init_a2b() {
memset(&req_noop, 0, sizeof(req_noop));
req_noop.message.header.request.magic = PROTOCOL_BINARY_REQ;
req_noop.message.header.request.opcode = PROTOCOL_BINARY_CMD_NOOP;
req_noop.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
// Run through the a2b_specs to populate the a2b_spec_map.
//
int i = 0;
while (true) {
struct A2BSpec *spec = &a2b_specs[i];
if (spec->line == NULL) {
break;
}
spec->ntokens = scan_tokens(spec->line,
spec->tokens,
MAX_TOKENS, NULL);
assert(spec->ntokens > 1);
int noreply_index = spec->ntokens - 2;
if (spec->tokens[noreply_index].value &&
strcmp(spec->tokens[noreply_index].value,
"[noreply]") == 0) {
spec->noreply_allowed = true;
} else {
spec->noreply_allowed = false;
}
spec->num_optional = 0;
for (int j = 0; j < spec->ntokens; j++) {
if (spec->tokens[j].value &&
spec->tokens[j].value[0] == '[') {
spec->num_optional++;
}
}
if (a2b_size_max < spec->size) {
a2b_size_max = spec->size;
}
assert(spec->cmd < (sizeof(a2b_spec_map) /
sizeof(struct A2BSpec *)));
a2b_spec_map[spec->cmd] = spec;
i = i + 1;
}
}
int a2b_fill_request(short cmd,
token_t *cmd_tokens,
int cmd_ntokens,
bool noreply,
protocol_binary_request_header *header,
uint8_t **out_key,
uint16_t *out_keylen,
uint8_t *out_extlen) {
assert(header);
assert(cmd_tokens);
assert(cmd_ntokens > 1);
assert(cmd_tokens[CMD_TOKEN].value);
assert(cmd_tokens[CMD_TOKEN].length > 0);
assert(out_key);
assert(out_keylen);
assert(out_extlen);
struct A2BSpec *spec = a2b_spec_map[cmd];
if (spec != NULL) {
if (cmd_ntokens >= (spec->ntokens - spec->num_optional) &&
cmd_ntokens <= (spec->ntokens)) {
header->request.magic = PROTOCOL_BINARY_REQ;
if (noreply) {
assert(spec->cmd != (protocol_binary_command) -1);
header->request.opcode = spec->cmdq;
header->request.opaque = htonl(OPAQUE_IGNORE_REPLY);
if (settings.verbose > 2) {
moxi_log_write("a2b_fill_request OPAQUE_IGNORE_REPLY, cmdq: %x\n",
spec->cmdq);
}
} else {
header->request.opcode = spec->cmd;
}
// Start at 1 to skip the CMD_TOKEN.
//
for (int i = 1; i < cmd_ntokens - 1; i++) {
if (a2b_fill_request_token(spec, i,
cmd_tokens, cmd_ntokens,
header,
out_key,
out_keylen,
out_extlen) == false) {
return 0;
}
}
return spec->size; // Success.
}
} else {
if (settings.verbose > 2) {
moxi_log_write("a2b_fill_request unknown cmd: %x\n", cmd);
}
}
return 0;
}
bool a2b_fill_request_token(struct A2BSpec *spec,
int cur_token,
token_t *cmd_tokens,
int cmd_ntokens,
protocol_binary_request_header *header,
uint8_t **out_key,
uint16_t *out_keylen,
uint8_t *out_extlen) {
(void)cmd_ntokens;
assert(header);
assert(spec);
assert(spec->tokens);
assert(spec->ntokens > 1);
assert(spec->tokens[cur_token].value);
assert(cur_token > 0);
assert(cur_token < cmd_ntokens);
assert(cur_token < spec->ntokens);
uint64_t delta;
if (settings.verbose > 2) {
moxi_log_write("a2b_fill_request_token %s\n",
spec->tokens[cur_token].value);
}
char t = spec->tokens[cur_token].value[1];
switch (t) {
case 'k': // key
assert(out_key);
assert(out_keylen);
*out_key = (uint8_t *) cmd_tokens[cur_token].value;
*out_keylen = (uint16_t) cmd_tokens[cur_token].length;
header->request.keylen =
htons((uint16_t) cmd_tokens[cur_token].length);
break;
case 'v': // value (for incr/decr)
delta = 0;
if (safe_strtoull(cmd_tokens[cur_token].value, &delta)) {
assert(out_extlen);
header->request.extlen = *out_extlen = 20;
header->request.datatype = PROTOCOL_BINARY_RAW_BYTES;
protocol_binary_request_incr *req =
(protocol_binary_request_incr *) header;
req->message.body.delta = htonll(delta);
req->message.body.initial = 0;
req->message.body.expiration = 0xffffffff;
} else {
// TODO: Send back better error.
return false;
}
break;
case 'x': { // xpiration (for flush_all)
int32_t exptime_int = 0;
time_t exptime = 0;
if (safe_strtol(cmd_tokens[cur_token].value, &exptime_int)) {
/* Ubuntu 8.04 breaks when I pass exptime to safe_strtol */
exptime = exptime_int;
header->request.extlen = *out_extlen = 4;
header->request.datatype = PROTOCOL_BINARY_RAW_BYTES;
protocol_binary_request_flush *req =
(protocol_binary_request_flush *) header;
req->message.body.expiration = htonl(exptime);
}
break;
}
case 'a': // args (for stats)
assert(out_key);
assert(out_keylen);
*out_key = (uint8_t *) cmd_tokens[cur_token].value;
*out_keylen = (uint16_t) cmd_tokens[cur_token].length;
header->request.keylen =
htons((uint16_t) cmd_tokens[cur_token].length);
break;
case 'c': { // cas value for unl
uint64_t cas = 0;
if (safe_strtoull(cmd_tokens[cur_token].value, &cas)) {
header->request.cas = cas;
}
break;
}
// The noreply was handled in a2b_fill_request().
//
// case 'n': // noreply
//
// The above are handled by looking at the item struct.
//
// case 'f': // FALLTHRU, flags
// case 'e': // FALLTHRU, exptime
// case 'b': // FALLTHRU, bytes
// case 's': // FALLTHRU, skip_xxx
// case 'c': // FALLTHRU, cas
//
default:
break;
}
return true;
}
/* Called when we receive a binary response header from
* a downstream server, via try_read_command()/drive_machine().
*/
void cproxy_process_a2b_downstream(conn *c) {
assert(c != NULL);
assert(c->cmd >= 0);
assert(c->next == NULL);
assert(c->item == NULL);
assert(IS_BINARY(c->protocol));
assert(IS_PROXY(c->protocol));
// Snapshot rcurr, because the caller, try_read_command(), changes it.
//
c->cmd_start = c->rcurr;
protocol_binary_response_header *header =
(protocol_binary_response_header *) &c->binary_header;
header->response.status = (uint16_t) ntohs(header->response.status);
assert(header->response.magic == (uint8_t) PROTOCOL_BINARY_RES);
assert(header->response.opcode == c->cmd);
process_bin_noreply(c); // Map quiet c->cmd values into non-quiet.
int extlen = header->response.extlen;
int keylen = header->response.keylen;
uint32_t bodylen = header->response.bodylen;
assert(bodylen >= (uint32_t) keylen + extlen);
// Our approach is to read everything we can before
// getting into big switch/case statements for the
// actual processing.
//
// If status is non-zero (an err code), then bodylen should be small.
// If status is 0, then bodylen might be for a huge item during
// a GET family of response.
//
// If bodylen > extlen + keylen, then we should nread
// the ext+key and set ourselves up for a later item nread.
//
// We overload the meaning of the conn substates...
// - bin_reading_get_key means do nread for ext and key data.
// - bin_read_set_value means do nread for item data.
//
if (settings.verbose > 2) {
moxi_log_write("<%d cproxy_process_a2b_downstream %x %d %d %u\n",
c->sfd, c->cmd, extlen, keylen, bodylen);
}
if (keylen > 0 || extlen > 0) {
// One reason we reach here is during a
// GET/GETQ/GETK/GETKQ hit response, because extlen
// will be > 0 for the flags.
//
// Also, we reach here during a GETK miss response, since
// keylen will be > 0. Oddly, a GETK miss response will have
// a non-zero status of PROTOCOL_BINARY_RESPONSE_KEY_ENOENT,
// but won't have any extra error message string.
//
// Also, we reach here during a STAT response, with
// keylen > 0, extlen == 0, and bodylen == keylen.
//
assert(c->cmd == PROTOCOL_BINARY_CMD_GET ||
c->cmd == PROTOCOL_BINARY_CMD_GETK ||
c->cmd == PROTOCOL_BINARY_CMD_GETL ||
c->cmd == PROTOCOL_BINARY_CMD_STAT);
bin_read_key(c, bin_reading_get_key, extlen);
} else {
assert(keylen == 0 && extlen == 0);
if (bodylen > 0) {
// We reach here on error response, version response,
// or incr/decr responses, which all have only (relatively
// small) body bytes, and with no ext bytes and no key bytes.
//
// For example, error responses will have 0 keylen,
// 0 extlen, with an error message string for the body.
//
// We'll just reuse the key-reading code path, rather
// than allocating an item.
//
assert(header->response.status != 0 ||
c->cmd == PROTOCOL_BINARY_CMD_VERSION ||
c->cmd == PROTOCOL_BINARY_CMD_INCREMENT ||
c->cmd == PROTOCOL_BINARY_CMD_DECREMENT ||
c->cmd == PROTOCOL_BINARY_CMD_UNL);
bin_read_key(c, bin_reading_get_key, bodylen);
} else {
assert(keylen == 0 && extlen == 0 && bodylen == 0);
// We have the entire response in the header,
// such as due to a general success response,
// including a no-op response.
//
a2b_process_downstream_response(c);
}
}
}
/* We reach here after nread'ing a ext+key or item.
*/
void cproxy_process_a2b_downstream_nread(conn *c) {
assert(c != NULL);
assert(c->cmd >= 0);
assert(c->next == NULL);
assert(c->cmd_start != NULL);
assert(IS_BINARY(c->protocol));
assert(IS_PROXY(c->protocol));
downstream *d = c->extra;
assert(d);
protocol_binary_response_header *header =
(protocol_binary_response_header *) &c->binary_header;
int extlen = header->response.extlen;
int keylen = header->response.keylen;
uint32_t bodylen = header->response.bodylen;
if (settings.verbose > 2) {
moxi_log_write("<%d cproxy_process_a2b_downstream_nread %d %d, cmd %x %d %d\n",
c->sfd, c->ileft, c->isize, c->cmd, c->substate,
header->response.status);
}
if (c->substate == bin_reading_get_key &&
header->response.status == 0 &&
(c->cmd == PROTOCOL_BINARY_CMD_GET ||
c->cmd == PROTOCOL_BINARY_CMD_GETK ||
c->cmd == PROTOCOL_BINARY_CMD_STAT ||
c->cmd == PROTOCOL_BINARY_CMD_GETL)) {
if (settings.verbose > 2) {
moxi_log_write("<%d cproxy_process_a2b_downstream_nread %d %d %x get/getk/stat\n",
c->sfd, c->ileft, c->isize, c->cmd);
}
assert(c->item == NULL);
// Alloc an item and continue with an item nread.
// We item_alloc() even if vlen is 0, so that later
// code can assume an item exists.
//
char *key = binary_get_key(c);
int vlen = bodylen - (keylen + extlen);
int flags = 0;
assert(key);
assert(vlen >= 0);
if (c->cmd == PROTOCOL_BINARY_CMD_GET ||
c->cmd == PROTOCOL_BINARY_CMD_GETK ||
c->cmd == PROTOCOL_BINARY_CMD_GETL) {
protocol_binary_response_get *response_get =
(protocol_binary_response_get *) binary_get_request(c);
assert(extlen == sizeof(response_get->message.body));
flags = ntohl(response_get->message.body.flags);
}
item *it = item_alloc(key, keylen, flags, 0, vlen + 2);
if (it != NULL) {
c->item = it;
c->ritem = ITEM_data(it);
c->rlbytes = vlen;
c->substate = bin_read_set_value;
uint64_t cas = CPROXY_NOT_CAS;
conn *uc = d->upstream_conn;
if (uc != NULL &&
uc->cmd_start != NULL &&
(strncmp(uc->cmd_start, "gets ", 5) == 0 ||
strncmp(uc->cmd_start, "getl ", 5) == 0)) {
cas = header->response.cas;
}
ITEM_set_cas(it, cas);
conn_set_state(c, conn_nread);
} else {
d->ptd->stats.stats.err_oom++;
cproxy_close_conn(c);
}
} else {
a2b_process_downstream_response(c);
}
}
static void a2b_out_error(conn *uc, uint16_t status) {
switch (status) {
case PROTOCOL_BINARY_RESPONSE_SUCCESS:
out_string(uc, "OK");
break;
case PROTOCOL_BINARY_RESPONSE_KEY_ENOENT:
out_string(uc, "NOT_FOUND");
break;
case PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS:
out_string(uc, "EXISTS");
break;
case PROTOCOL_BINARY_RESPONSE_E2BIG:
out_string(uc, "SERVER_ERROR a2b e2big");
break;
case PROTOCOL_BINARY_RESPONSE_EINVAL:
out_string(uc, "SERVER_ERROR a2b einval");
break;
case PROTOCOL_BINARY_RESPONSE_NOT_STORED:
out_string(uc, "NOT_STORED");
break;
case PROTOCOL_BINARY_RESPONSE_DELTA_BADVAL:
out_string(uc, "SERVER_ERROR a2b delta_badval");
break;
case PROTOCOL_BINARY_RESPONSE_NOT_MY_VBUCKET:
out_string(uc, "SERVER_ERROR a2b not_my_vbucket");
break;
case PROTOCOL_BINARY_RESPONSE_AUTH_ERROR:
out_string(uc, "SERVER_ERROR a2b auth_error");
break;
case PROTOCOL_BINARY_RESPONSE_AUTH_CONTINUE:
out_string(uc, "SERVER_ERROR a2b auth_continue");
break;
case PROTOCOL_BINARY_RESPONSE_UNKNOWN_COMMAND:
out_string(uc, "SERVER_ERROR a2b unknown");
break;
case PROTOCOL_BINARY_RESPONSE_ENOMEM:
out_string(uc, "SERVER_ERROR a2b out of memory");
break;
case PROTOCOL_BINARY_RESPONSE_NOT_SUPPORTED:
out_string(uc, "SERVER_ERROR a2b not supported");
break;
case PROTOCOL_BINARY_RESPONSE_EINTERNAL:
out_string(uc, "SERVER_ERROR a2b einternal");
break;
case PROTOCOL_BINARY_RESPONSE_EBUSY:
out_string(uc, "SERVER_ERROR a2b ebusy");
break;
case PROTOCOL_BINARY_RESPONSE_ETMPFAIL:
out_string(uc, "SERVER_ERROR temporary failure");
break;
default:
out_string(uc, "SERVER_ERROR a2b error");
break;
}
}
/* Invoked when we have read a complete downstream binary response,
* including header, ext, key, and item data, as appropriate.
*/
void a2b_process_downstream_response(conn *c) {
assert(c != NULL);
assert(c->cmd >= 0);
assert(c->next == NULL);
assert(c->cmd_start != NULL);
assert(IS_BINARY(c->protocol));
assert(IS_PROXY(c->protocol));
protocol_binary_response_header *header =
(protocol_binary_response_header *) &c->binary_header;
uint32_t extlen = header->response.extlen;
uint32_t keylen = header->response.keylen;
uint32_t bodylen = header->response.bodylen;
uint16_t status = header->response.status;
if (settings.verbose > 2) {
moxi_log_write("<%d cproxy_process_a2b_downstream_response, cmd: %x, item: %d, status: %d\n",
c->sfd, c->cmd, (c->item != NULL), status);
}
// We reach here when we have the entire response,
// including header, ext, key, and possibly item data.
// Now we can get into big switch/case processing.
//
downstream *d = c->extra;
assert(d != NULL);
assert(d->ptd != NULL);
assert(d->ptd->proxy != NULL);
item *it = c->item;
// Clear c->item because we either move it to the upstream or
// item_remove() it on error.
//
c->item = NULL;
if (cproxy_binary_ignore_reply(c, header, it)) {
return;
}
conn *uc = d->upstream_conn;
// Handle not-my-vbucket error response.
//
if (status == PROTOCOL_BINARY_RESPONSE_NOT_MY_VBUCKET) {
assert(it == NULL);
if (a2b_not_my_vbucket(uc, c, header)) {
return;
}
}
switch (c->cmd) {
case PROTOCOL_BINARY_CMD_GETK:
if (settings.verbose > 2) {
moxi_log_write("%d: cproxy_process_a2b_downstream_response GETK "
"noreply: %d\n", c->sfd, c->noreply);
}
if (c->noreply == false) {
// Single-key GET/GETS.
//
if (status == 0) {
assert(it != NULL);
assert(it->nbytes >= 2);
assert(keylen > 0);
assert(extlen > 0);
if (bodylen >= keylen + extlen) {
*(ITEM_data(it) + it->nbytes - 2) = '\r';
*(ITEM_data(it) + it->nbytes - 1) = '\n';
multiget_ascii_downstream_response(d, it);
} else {
assert(false); // TODO.
}
item_remove(it);
}
conn_set_state(c, conn_pause);
cproxy_update_event_write(d, uc);
return;
}
// Multi-key GET/GETS.
//
// We should keep processing for a non-quiet
// terminating response (NO-OP).
//
conn_set_state(c, conn_new_cmd);
if (status != 0) {
assert(it == NULL);
if (status == PROTOCOL_BINARY_RESPONSE_KEY_ENOENT) {
return; // Swallow miss response.
}
// TODO: Handle error case. Should we pause the conn
// or keep looking for more responses?
//
assert(false);
return;
}
assert(status == 0);
assert(it != NULL);
assert(it->nbytes >= 2);
assert(keylen > 0);
assert(extlen > 0);
if (bodylen >= keylen + extlen) {
*(ITEM_data(it) + it->nbytes - 2) = '\r';
*(ITEM_data(it) + it->nbytes - 1) = '\n';
multiget_ascii_downstream_response(d, it);
} else {
assert(false); // TODO.
}
item_remove(it);
break;
case PROTOCOL_BINARY_CMD_GETL:
if (settings.verbose > 2) {
moxi_log_write("%d: cproxy_process_a2b_downstream_response GETL "
"noreply: %d\n", c->sfd, c->noreply);
}
if (c->noreply == false) {
switch (status) {
case PROTOCOL_BINARY_RESPONSE_SUCCESS:
assert(it != NULL);
assert(it->nbytes >= 2);
assert(extlen > 0);
if (bodylen >= keylen + extlen) {
*(ITEM_data(it) + it->nbytes - 2) = '\r';
*(ITEM_data(it) + it->nbytes - 1) = '\n';
cproxy_upstream_ascii_item_response(it, uc, -1);
} else {
assert(false); // TODO.
}
item_remove(it);
break;
case PROTOCOL_BINARY_RESPONSE_ETMPFAIL:
case PROTOCOL_BINARY_RESPONSE_UNKNOWN_COMMAND:
/*
* currently membase does not send ETMPFAIL for
* engine error code for ENGINE_TMPFAIL
*/
d->upstream_suffix = "LOCK_ERROR\r\n";
d->upstream_suffix_len = 0;
d->upstream_status = status;
d->upstream_retry = 0;
d->target_host_ident = NULL;
break;
case PROTOCOL_BINARY_RESPONSE_KEY_ENOENT:
d->upstream_suffix = "NOT_FOUND\r\n";
d->upstream_suffix_len = 0;
d->upstream_status = status;
d->upstream_retry = 0;
d->target_host_ident = NULL;
break;
}
conn_set_state(c, conn_pause);
cproxy_update_event_write(d, uc);
return;
}
case PROTOCOL_BINARY_CMD_FLUSH:
conn_set_state(c, conn_pause);
// TODO: Handle flush_all's expiration parameter against
// the front_cache.
//
// TODO: We flush the front_cache too often, inefficiently
// on every downstream FLUSH response, rather than on
// just the last FLUSH response.
//
if (uc != NULL) {
mcache_flush_all(&d->ptd->proxy->front_cache, 0);
}
break;
case PROTOCOL_BINARY_CMD_NOOP:
conn_set_state(c, conn_pause);
break;
case PROTOCOL_BINARY_CMD_SET: /* FALLTHROUGH */
case PROTOCOL_BINARY_CMD_ADD:
case PROTOCOL_BINARY_CMD_REPLACE:
case PROTOCOL_BINARY_CMD_APPEND:
case PROTOCOL_BINARY_CMD_PREPEND:
case PROTOCOL_BINARY_CMD_TOUCH:
conn_set_state(c, conn_pause);
if (uc != NULL) {
assert(uc->next == NULL);
switch (status) {
case PROTOCOL_BINARY_RESPONSE_SUCCESS:
out_string(uc, "STORED");
break;
case PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS:
if (c->cmd == PROTOCOL_BINARY_CMD_ADD) {
out_string(uc, "NOT_STORED");
} else {
out_string(uc, "EXISTS");
}
break;
case PROTOCOL_BINARY_RESPONSE_KEY_ENOENT:
if (c->cmd == PROTOCOL_BINARY_CMD_REPLACE) {
out_string(uc, "NOT_STORED");
} else {
out_string(uc, "NOT_FOUND");
}
break;
default:
a2b_out_error(uc, status);
break;
}
cproxy_del_front_cache_key_ascii(d, uc->cmd_start);
cproxy_update_event_write(d, uc);
}
break;
case PROTOCOL_BINARY_CMD_DELETE:
conn_set_state(c, conn_pause);
if (uc != NULL) {
assert(uc->next == NULL);
switch (status) {
case 0:
out_string(uc, "DELETED");
break;
case PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS:
out_string(uc, "EXISTS");
break;
case PROTOCOL_BINARY_RESPONSE_KEY_ENOENT:
case PROTOCOL_BINARY_RESPONSE_NOT_STORED:
case PROTOCOL_BINARY_RESPONSE_ENOMEM: // TODO.
default:
out_string(uc, "NOT_FOUND");
break;
}
cproxy_del_front_cache_key_ascii(d, uc->cmd_start);
cproxy_update_event_write(d, uc);
}
break;
case PROTOCOL_BINARY_CMD_INCREMENT: /* FALLTHROUGH */
case PROTOCOL_BINARY_CMD_DECREMENT:
conn_set_state(c, conn_pause);
if (uc != NULL) {
assert(uc->next == NULL);
// TODO: Any weird alignment/padding issues on different
// platforms in this cast to worry about here?
//
protocol_binary_response_incr *response_incr =
(protocol_binary_response_incr *) c->cmd_start;
switch (status) {
case 0: {
char *s = add_conn_suffix(uc);
if (s != NULL) {
uint64_t v = mc_swap64(response_incr->message.body.value);
sprintf(s, "%llu", (unsigned long long) v);
out_string(uc, s);
} else {
d->ptd->stats.stats.err_oom++;
cproxy_close_conn(uc);
}
break;
}
case PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS: // Due to CAS.
out_string(uc, "EXISTS");
break;
case PROTOCOL_BINARY_RESPONSE_KEY_ENOENT:
out_string(uc, "NOT_FOUND");
break;
case PROTOCOL_BINARY_RESPONSE_NOT_STORED:
out_string(uc, "NOT_STORED");
break;
case PROTOCOL_BINARY_RESPONSE_ENOMEM: // TODO.
default:
out_string(uc, "SERVER_ERROR a2b arith error");
break;
}
cproxy_del_front_cache_key_ascii(d, uc->cmd_start);
cproxy_update_event_write(d, uc);
}
break;
case PROTOCOL_BINARY_CMD_VERSION:
case PROTOCOL_BINARY_CMD_UNL:
conn_set_state(c, conn_pause);
if (uc != NULL) {
assert(uc->next == NULL);
if ((header->response.status == 0 ||
c->cmd == PROTOCOL_BINARY_CMD_UNL) &&
header->response.keylen == 0 &&
header->response.extlen == 0 &&
header->response.bodylen > 0) {
char *s = add_conn_suffix(uc);
uint32_t buf_offset = 0;
if (s != NULL) {
// TODO: Assuming bodylen is not that long.
if (c->cmd == PROTOCOL_BINARY_CMD_VERSION) {
memcpy(s, "VERSION ", 8);