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nc_conf.c
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/*
* twemproxy - A fast and lightweight proxy for memcached protocol.
* Copyright (C) 2011 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <nc_core.h>
#include <nc_conf.h>
#include <nc_server.h>
#include <proto/nc_proto.h>
#define DEFINE_ACTION(_hash, _name) string(#_name),
static struct string hash_strings[] = {
HASH_CODEC( DEFINE_ACTION )
null_string
};
#undef DEFINE_ACTION
#define DEFINE_ACTION(_hash, _name) hash_##_name,
static hash_t hash_algos[] = {
HASH_CODEC( DEFINE_ACTION )
NULL
};
#undef DEFINE_ACTION
#define DEFINE_ACTION(_dist, _name) string(#_name),
static struct string dist_strings[] = {
DIST_CODEC( DEFINE_ACTION )
null_string
};
#undef DEFINE_ACTION
static struct command conf_commands[] = {
{ string("listen"),
conf_set_listen,
offsetof(struct conf_pool, listen) },
{ string("hash"),
conf_set_hash,
offsetof(struct conf_pool, hash) },
{ string("distribution"),
conf_set_distribution,
offsetof(struct conf_pool, distribution) },
{ string("timeout"),
conf_set_num,
offsetof(struct conf_pool, timeout) },
{ string("backlog"),
conf_set_num,
offsetof(struct conf_pool, backlog) },
{ string("client_connections"),
conf_set_num,
offsetof(struct conf_pool, client_connections) },
{ string("redis"),
conf_set_bool,
offsetof(struct conf_pool, redis) },
{ string("preconnect"),
conf_set_bool,
offsetof(struct conf_pool, preconnect) },
{ string("auto_eject_hosts"),
conf_set_bool,
offsetof(struct conf_pool, auto_eject_hosts) },
{ string("server_connections"),
conf_set_num,
offsetof(struct conf_pool, server_connections) },
{ string("server_retry_timeout"),
conf_set_num,
offsetof(struct conf_pool, server_retry_timeout) },
{ string("server_failure_limit"),
conf_set_num,
offsetof(struct conf_pool, server_failure_limit) },
{ string("servers"),
conf_add_server,
offsetof(struct conf_pool, server) },
null_command
};
static void
conf_server_init(struct conf_server *cs)
{
string_init(&cs->pname);
string_init(&cs->name);
cs->port = 0;
cs->weight = 0;
memset(&cs->info, 0, sizeof(cs->info));
cs->valid = 0;
log_debug(LOG_VVERB, "init conf server %p", cs);
}
static void
conf_server_deinit(struct conf_server *cs)
{
string_deinit(&cs->pname);
string_deinit(&cs->name);
cs->valid = 0;
log_debug(LOG_VVERB, "deinit conf server %p", cs);
}
rstatus_t
conf_server_each_transform(void *elem, void *data)
{
struct conf_server *cs = elem;
struct array *server = data;
struct server *s;
ASSERT(cs->valid);
s = array_push(server);
ASSERT(s != NULL);
s->idx = array_idx(server, s);
s->owner = NULL;
s->pname = cs->pname;
s->name = cs->name;
s->port = (uint16_t)cs->port;
s->weight = (uint32_t)cs->weight;
s->family = cs->info.family;
s->addrlen = cs->info.addrlen;
s->addr = (struct sockaddr *)&cs->info.addr;
s->ns_conn_q = 0;
TAILQ_INIT(&s->s_conn_q);
s->next_retry = 0LL;
s->failure_count = 0;
log_debug(LOG_VERB, "transform to server %"PRIu32" '%.*s'",
s->idx, s->pname.len, s->pname.data);
return NC_OK;
}
static rstatus_t
conf_pool_init(struct conf_pool *cp, struct string *name)
{
rstatus_t status;
string_init(&cp->name);
string_init(&cp->listen.pname);
string_init(&cp->listen.name);
cp->listen.port = 0;
memset(&cp->listen.info, 0, sizeof(cp->listen.info));
cp->listen.valid = 0;
cp->hash = CONF_UNSET_HASH;
cp->distribution = CONF_UNSET_DIST;
cp->timeout = CONF_UNSET_NUM;
cp->backlog = CONF_UNSET_NUM;
cp->client_connections = CONF_UNSET_NUM;
cp->redis = CONF_UNSET_NUM;
cp->preconnect = CONF_UNSET_NUM;
cp->auto_eject_hosts = CONF_UNSET_NUM;
cp->server_connections = CONF_UNSET_NUM;
cp->server_retry_timeout = CONF_UNSET_NUM;
cp->server_failure_limit = CONF_UNSET_NUM;
array_null(&cp->server);
cp->valid = 0;
status = string_duplicate(&cp->name, name);
if (status != NC_OK) {
return status;
}
status = array_init(&cp->server, CONF_DEFAULT_SERVERS,
sizeof(struct conf_server));
if (status != NC_OK) {
string_deinit(&cp->name);
return status;
}
log_debug(LOG_VVERB, "init conf pool %p, '%.*s'", cp, name->len, name->data);
return NC_OK;
}
static void
conf_pool_deinit(struct conf_pool *cp)
{
string_deinit(&cp->name);
string_deinit(&cp->listen.pname);
string_deinit(&cp->listen.name);
while (array_n(&cp->server) != 0) {
conf_server_deinit(array_pop(&cp->server));
}
array_deinit(&cp->server);
log_debug(LOG_VVERB, "deinit conf pool %p", cp);
}
rstatus_t
conf_pool_each_transform(void *elem, void *data)
{
rstatus_t status;
struct conf_pool *cp = elem;
struct array *server_pool = data;
struct server_pool *sp;
ASSERT(cp->valid);
sp = array_push(server_pool);
ASSERT(sp != NULL);
sp->idx = array_idx(server_pool, sp);
sp->ctx = NULL;
sp->p_conn = NULL;
sp->nc_conn_q = 0;
TAILQ_INIT(&sp->c_conn_q);
array_null(&sp->server);
sp->ncontinuum = 0;
sp->nserver_continuum = 0;
sp->continuum = NULL;
sp->nlive_server = 0;
sp->next_rebuild = 0LL;
sp->name = cp->name;
sp->addrstr = cp->listen.pname;
sp->port = (uint16_t)cp->listen.port;
sp->family = cp->listen.info.family;
sp->addrlen = cp->listen.info.addrlen;
sp->addr = (struct sockaddr *)&cp->listen.info.addr;
sp->dist_type = cp->distribution;
sp->key_hash_type = cp->hash;
sp->key_hash = hash_algos[cp->hash];
sp->redis = cp->redis ? 1 : 0;
sp->timeout = cp->timeout;
sp->backlog = cp->backlog;
sp->client_connections = (uint32_t)cp->client_connections;
sp->server_connections = (uint32_t)cp->server_connections;
sp->server_retry_timeout = (int64_t)cp->server_retry_timeout * 1000LL;
sp->server_failure_limit = (uint32_t)cp->server_failure_limit;
sp->auto_eject_hosts = cp->auto_eject_hosts ? 1 : 0;
sp->preconnect = cp->preconnect ? 1 : 0;
status = server_init(&sp->server, &cp->server, sp);
if (status != NC_OK) {
return status;
}
log_debug(LOG_VERB, "transform to pool %"PRIu32" '%.*s'", sp->idx,
sp->name.len, sp->name.data);
return NC_OK;
}
static void
conf_dump(struct conf *cf)
{
uint32_t i, j, npool, nserver;
struct conf_pool *cp;
struct string *s;
npool = array_n(&cf->pool);
if (npool == 0) {
return;
}
log_debug(LOG_VVERB, "%"PRIu32" pools in configuration file '%s'", npool,
cf->fname);
for (i = 0; i < npool; i++) {
cp = array_get(&cf->pool, i);
log_debug(LOG_VVERB, "%.*s", cp->name.len, cp->name.data);
log_debug(LOG_VVERB, " listen: %.*s",
cp->listen.pname.len, cp->listen.pname.data);
log_debug(LOG_VVERB, " hash: %d", cp->hash);
log_debug(LOG_VVERB, " timeout: %d", cp->timeout);
log_debug(LOG_VVERB, " backlog: %d", cp->backlog);
log_debug(LOG_VVERB, " distribution: %d", cp->distribution);
log_debug(LOG_VVERB, " client_connections: %d",
cp->client_connections);
log_debug(LOG_VVERB, " redis: %d", cp->redis);
log_debug(LOG_VVERB, " preconnect: %d", cp->preconnect);
log_debug(LOG_VVERB, " auto_eject_hosts: %d", cp->auto_eject_hosts);
log_debug(LOG_VVERB, " server_connections: %d",
cp->server_connections);
log_debug(LOG_VVERB, " server_retry_timeout: %d",
cp->server_retry_timeout);
log_debug(LOG_VVERB, " server_failure_limit: %d",
cp->server_failure_limit);
nserver = array_n(&cp->server);
log_debug(LOG_VVERB, " servers: %"PRIu32"", nserver);
for (j = 0; j < nserver; j++) {
s = array_get(&cp->server, j);
log_debug(LOG_VVERB, " %.*s", s->len, s->data);
}
}
}
static rstatus_t
conf_yaml_init(struct conf *cf)
{
int rv;
ASSERT(!cf->valid_parser);
rv = fseek(cf->fh, 0L, SEEK_SET);
if (rv < 0) {
log_error("conf: failed to seek to the beginning of file '%s': %s",
cf->fname, strerror(errno));
return NC_ERROR;
}
rv = yaml_parser_initialize(&cf->parser);
if (!rv) {
log_error("conf: failed (err %d) to initialize yaml parser",
cf->parser.error);
return NC_ERROR;
}
yaml_parser_set_input_file(&cf->parser, cf->fh);
cf->valid_parser = 1;
return NC_OK;
}
static void
conf_yaml_deinit(struct conf *cf)
{
if (cf->valid_parser) {
yaml_parser_delete(&cf->parser);
cf->valid_parser = 0;
}
}
static rstatus_t
conf_token_next(struct conf *cf)
{
int rv;
ASSERT(cf->valid_parser && !cf->valid_token);
rv = yaml_parser_scan(&cf->parser, &cf->token);
if (!rv) {
log_error("conf: failed (err %d) to scan next token", cf->parser.error);
return NC_ERROR;
}
cf->valid_token = 1;
return NC_OK;
}
static void
conf_token_done(struct conf *cf)
{
ASSERT(cf->valid_parser);
if (cf->valid_token) {
yaml_token_delete(&cf->token);
cf->valid_token = 0;
}
}
static rstatus_t
conf_event_next(struct conf *cf)
{
int rv;
ASSERT(cf->valid_parser && !cf->valid_event);
rv = yaml_parser_parse(&cf->parser, &cf->event);
if (!rv) {
log_error("conf: failed (err %d) to get next event", cf->parser.error);
return NC_ERROR;
}
cf->valid_event = 1;
return NC_OK;
}
static void
conf_event_done(struct conf *cf)
{
if (cf->valid_event) {
yaml_event_delete(&cf->event);
cf->valid_event = 0;
}
}
static rstatus_t
conf_push_scalar(struct conf *cf)
{
rstatus_t status;
struct string *value;
uint8_t *scalar;
uint32_t scalar_len;
scalar = cf->event.data.scalar.value;
scalar_len = (uint32_t)cf->event.data.scalar.length;
log_debug(LOG_VVERB, "push '%.*s'", scalar_len, scalar);
value = array_push(&cf->arg);
if (value == NULL) {
return NC_ENOMEM;
}
string_init(value);
status = string_copy(value, scalar, scalar_len);
if (status != NC_OK) {
array_pop(&cf->arg);
return status;
}
return NC_OK;
}
static void
conf_pop_scalar(struct conf *cf)
{
struct string *value;
value = array_pop(&cf->arg);
log_debug(LOG_VVERB, "pop '%.*s'", value->len, value->data);
string_deinit(value);
}
static rstatus_t
conf_handler(struct conf *cf, void *data)
{
struct command *cmd;
struct string *key, *value;
uint32_t narg;
if (array_n(&cf->arg) == 1) {
value = array_top(&cf->arg);
log_debug(LOG_VVERB, "conf handler on '%.*s'", value->len, value->data);
return conf_pool_init(data, value);
}
narg = array_n(&cf->arg);
value = array_get(&cf->arg, narg - 1);
key = array_get(&cf->arg, narg - 2);
log_debug(LOG_VVERB, "conf handler on %.*s: %.*s", key->len, key->data,
value->len, value->data);
for (cmd = conf_commands; cmd->name.len != 0; cmd++) {
char *rv;
if (string_compare(key, &cmd->name) != 0) {
continue;
}
rv = cmd->set(cf, cmd, data);
if (rv != CONF_OK) {
log_error("conf: directive \"%.*s\" %s", key->len, key->data, rv);
return NC_ERROR;
}
return NC_OK;
}
log_error("conf: directive \"%.*s\" is unknown", key->len, key->data);
return NC_ERROR;
}
static rstatus_t
conf_begin_parse(struct conf *cf)
{
rstatus_t status;
bool done;
ASSERT(cf->sound && !cf->parsed);
ASSERT(cf->depth == 0);
status = conf_yaml_init(cf);
if (status != NC_OK) {
return status;
}
done = false;
do {
status = conf_event_next(cf);
if (status != NC_OK) {
return status;
}
log_debug(LOG_VVERB, "next begin event %d", cf->event.type);
switch (cf->event.type) {
case YAML_STREAM_START_EVENT:
case YAML_DOCUMENT_START_EVENT:
break;
case YAML_MAPPING_START_EVENT:
ASSERT(cf->depth < CONF_MAX_DEPTH);
cf->depth++;
done = true;
break;
default:
NOT_REACHED();
}
conf_event_done(cf);
} while (!done);
return NC_OK;
}
static rstatus_t
conf_end_parse(struct conf *cf)
{
rstatus_t status;
bool done;
ASSERT(cf->sound && !cf->parsed);
ASSERT(cf->depth == 0);
done = false;
do {
status = conf_event_next(cf);
if (status != NC_OK) {
return status;
}
log_debug(LOG_VVERB, "next end event %d", cf->event.type);
switch (cf->event.type) {
case YAML_STREAM_END_EVENT:
done = true;
break;
case YAML_DOCUMENT_END_EVENT:
break;
default:
NOT_REACHED();
}
conf_event_done(cf);
} while (!done);
conf_yaml_deinit(cf);
return NC_OK;
}
static rstatus_t
conf_parse_core(struct conf *cf, void *data)
{
rstatus_t status;
bool done, leaf, new_pool;
ASSERT(cf->sound);
status = conf_event_next(cf);
if (status != NC_OK) {
return status;
}
log_debug(LOG_VVERB, "next event %d depth %"PRIu32" seq %d", cf->event.type,
cf->depth, cf->seq);
done = false;
leaf = false;
new_pool = false;
switch (cf->event.type) {
case YAML_MAPPING_END_EVENT:
cf->depth--;
if (cf->depth == 1) {
conf_pop_scalar(cf);
} else if (cf->depth == 0) {
done = true;
}
break;
case YAML_MAPPING_START_EVENT:
cf->depth++;
break;
case YAML_SEQUENCE_START_EVENT:
cf->seq = 1;
break;
case YAML_SEQUENCE_END_EVENT:
conf_pop_scalar(cf);
cf->seq = 0;
break;
case YAML_SCALAR_EVENT:
status = conf_push_scalar(cf);
if (status != NC_OK) {
break;
}
/* take appropriate action */
if (cf->seq) {
/* for a sequence, leaf is at CONF_MAX_DEPTH */
ASSERT(cf->depth == CONF_MAX_DEPTH);
leaf = true;
} else if (cf->depth == CONF_ROOT_DEPTH) {
/* create new conf_pool */
data = array_push(&cf->pool);
if (data == NULL) {
status = NC_ENOMEM;
break;
}
new_pool = true;
} else if (array_n(&cf->arg) == cf->depth + 1) {
/* for {key: value}, leaf is at CONF_MAX_DEPTH */
ASSERT(cf->depth == CONF_MAX_DEPTH);
leaf = true;
}
break;
default:
NOT_REACHED();
break;
}
conf_event_done(cf);
if (status != NC_OK) {
return status;
}
if (done) {
/* terminating condition */
return NC_OK;
}
if (leaf || new_pool) {
status = conf_handler(cf, data);
if (leaf) {
conf_pop_scalar(cf);
if (!cf->seq) {
conf_pop_scalar(cf);
}
}
if (status != NC_OK) {
return status;
}
}
return conf_parse_core(cf, data);
}
static rstatus_t
conf_parse(struct conf *cf)
{
rstatus_t status;
ASSERT(cf->sound && !cf->parsed);
ASSERT(array_n(&cf->arg) == 0);
status = conf_begin_parse(cf);
if (status != NC_OK) {
return status;
}
status = conf_parse_core(cf, NULL);
if (status != NC_OK) {
return status;
}
status = conf_end_parse(cf);
if (status != NC_OK) {
return status;
}
cf->parsed = 1;
return NC_OK;
}
static struct conf *
conf_open(char *filename)
{
rstatus_t status;
struct conf *cf;
FILE *fh;
fh = fopen(filename, "r");
if (fh == NULL) {
log_error("conf: failed to open configuration '%s': %s", filename,
strerror(errno));
return NULL;
}
cf = nc_alloc(sizeof(*cf));
if (cf == NULL) {
fclose(fh);
return NULL;
}
status = array_init(&cf->arg, CONF_DEFAULT_ARGS, sizeof(struct string));
if (status != NC_OK) {
nc_free(cf);
fclose(fh);
return NULL;
}
status = array_init(&cf->pool, CONF_DEFAULT_POOL, sizeof(struct conf_pool));
if (status != NC_OK) {
array_deinit(&cf->arg);
nc_free(cf);
fclose(fh);
return NULL;
}
cf->fname = filename;
cf->fh = fh;
cf->depth = 0;
/* parser, event, and token are initialized later */
cf->seq = 0;
cf->valid_parser = 0;
cf->valid_event = 0;
cf->valid_token = 0;
cf->sound = 0;
cf->parsed = 0;
cf->valid = 0;
log_debug(LOG_VVERB, "opened conf '%s'", filename);
return cf;
}
static rstatus_t
conf_validate_document(struct conf *cf)
{
rstatus_t status;
uint32_t count;
bool done;
status = conf_yaml_init(cf);
if (status != NC_OK) {
return status;
}
count = 0;
done = false;
do {
yaml_document_t document;
yaml_node_t *node;
int rv;
rv = yaml_parser_load(&cf->parser, &document);
if (!rv) {
log_error("conf: failed (err %d) to get the next yaml document",
cf->parser.error);
conf_yaml_deinit(cf);
return NC_ERROR;
}
node = yaml_document_get_root_node(&document);
if (node == NULL) {
done = true;
} else {
count++;
}
yaml_document_delete(&document);
} while (!done);
conf_yaml_deinit(cf);
if (count != 1) {
log_error("conf: '%s' must contain only 1 document; found %"PRIu32" "
"documents", cf->fname, count);
return NC_ERROR;
}
return NC_OK;
}
static rstatus_t
conf_validate_tokens(struct conf *cf)
{
rstatus_t status;
bool done, error;
int type;
status = conf_yaml_init(cf);
if (status != NC_OK) {
return status;
}
done = false;
error = false;
do {
status = conf_token_next(cf);
if (status != NC_OK) {
return status;
}
type = cf->token.type;
switch (type) {
case YAML_NO_TOKEN:
error = true;
log_error("conf: no token (%d) is disallowed", type);
break;
case YAML_VERSION_DIRECTIVE_TOKEN:
error = true;
log_error("conf: version directive token (%d) is disallowed", type);
break;
case YAML_TAG_DIRECTIVE_TOKEN:
error = true;
log_error("conf: tag directive token (%d) is disallowed", type);
break;
case YAML_DOCUMENT_START_TOKEN:
error = true;
log_error("conf: document start token (%d) is disallowed", type);
break;
case YAML_DOCUMENT_END_TOKEN:
error = true;
log_error("conf: document end token (%d) is disallowed", type);
break;
case YAML_FLOW_SEQUENCE_START_TOKEN:
error = true;
log_error("conf: flow sequence start token (%d) is disallowed", type);
break;
case YAML_FLOW_SEQUENCE_END_TOKEN:
error = true;
log_error("conf: flow sequence end token (%d) is disallowed", type);
break;
case YAML_FLOW_MAPPING_START_TOKEN:
error = true;
log_error("conf: flow mapping start token (%d) is disallowed", type);
break;
case YAML_FLOW_MAPPING_END_TOKEN:
error = true;
log_error("conf: flow mapping end token (%d) is disallowed", type);
break;
case YAML_FLOW_ENTRY_TOKEN:
error = true;
log_error("conf: flow entry token (%d) is disallowed", type);
break;
case YAML_ALIAS_TOKEN:
error = true;
log_error("conf: alias token (%d) is disallowed", type);
break;
case YAML_ANCHOR_TOKEN:
error = true;
log_error("conf: anchor token (%d) is disallowed", type);
break;
case YAML_TAG_TOKEN:
error = true;
log_error("conf: tag token (%d) is disallowed", type);
break;
case YAML_BLOCK_SEQUENCE_START_TOKEN:
case YAML_BLOCK_MAPPING_START_TOKEN:
case YAML_BLOCK_END_TOKEN:
case YAML_BLOCK_ENTRY_TOKEN:
break;
case YAML_KEY_TOKEN:
case YAML_VALUE_TOKEN:
case YAML_SCALAR_TOKEN:
break;
case YAML_STREAM_START_TOKEN:
break;
case YAML_STREAM_END_TOKEN:
done = true;
log_debug(LOG_VVERB, "conf '%s' has valid tokens", cf->fname);
break;
default:
error = true;
log_error("conf: unknown token (%d) is disallowed", type);
break;
}
conf_token_done(cf);
} while (!done && !error);
conf_yaml_deinit(cf);
return !error ? NC_OK : NC_ERROR;
}
static rstatus_t
conf_validate_structure(struct conf *cf)
{
rstatus_t status;
int type, depth;
uint32_t i, count[CONF_MAX_DEPTH + 1];
bool done, error, seq;
status = conf_yaml_init(cf);
if (status != NC_OK) {
return status;
}
done = false;
error = false;
seq = false;
depth = 0;
for (i = 0; i < CONF_MAX_DEPTH + 1; i++) {
count[i] = 0;
}
/*
* Validate that the configuration conforms roughly to the following
* yaml tree structure:
*
* keyx:
* key1: value1
* key2: value2
* seq:
* - elem1
* - elem2
* - elem3
* key3: value3
*
* keyy:
* key1: value1
* key2: value2
* seq:
* - elem1
* - elem2
* - elem3
* key3: value3
*/
do {
status = conf_event_next(cf);
if (status != NC_OK) {
return status;
}
type = cf->event.type;
log_debug(LOG_VVERB, "next event %d depth %d seq %d", type, depth, seq);
switch (type) {
case YAML_STREAM_START_EVENT:
case YAML_DOCUMENT_START_EVENT:
break;
case YAML_DOCUMENT_END_EVENT:
break;
case YAML_STREAM_END_EVENT:
done = true;
break;