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mrpc_common.c
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mrpc_common.c
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#include "proxy.h"
#include "hashtable_itr.h"
extern pxy_worker_t *worker;
extern upstream_map_t *upstream_root;
//static char* PROTOCOL = "MCP/3.0";
static struct hashtable *stash_conns_table = NULL;
mrpc_buf_t* mrpc_buf_new(size_t size)
{
mrpc_buf_t *b = calloc(1, sizeof(*b));
if (!b) {
E("no mem for mrpc_buf_t");
return NULL;
}
b->buf = malloc(size);
if (!b->buf) {
E("no mem for buf");
free(b);
return NULL;
}
b->len = size;
return b;
}
//TODO check the result
int mrpc_buf_enlarge(mrpc_buf_t *buf)
{
void *n = realloc(buf->buf, buf->len * 2);
if (n) {
buf->buf = n;
buf->len = buf->len * 2;
return 0;
}
return -1;
}
void mrpc_buf_reset(mrpc_buf_t *buf)
{
buf->offset = 0;
buf->size = 0;
//shrink the buf
if (buf->len > MRPC_BUF_SIZE) {
void *t = realloc(buf->buf, MRPC_BUF_SIZE);
if (t) {
buf->buf = t;
buf->len = MRPC_BUF_SIZE;
} else {
E("realloc for buf reset error");
}
}
}
void mrpc_buf_free(mrpc_buf_t *buf)
{
free(buf->buf);
free(buf);
}
mrpc_connection_t* mrpc_conn_new(mrpc_us_item_t* us)
{
mrpc_connection_t *c = NULL;
c = calloc(1, sizeof(*c));
if (!c) {
E("malloc upstream connection error");
return NULL;
}
c->send_buf = mrpc_buf_new(MRPC_BUF_SIZE);
if (!c->send_buf) {
E("cannot malloc send_buf!");
free(c);
return NULL;
}
c->recv_buf = mrpc_buf_new(MRPC_BUF_SIZE);
if (!c->recv_buf) {
E("cannot malloc recv_buf");
mrpc_buf_free(c->send_buf);
free(c);
return NULL;
}
c->fd = -1;
c->refs = 0;
c->us = us;
c->conn_status = MRPC_CONN_DISCONNECTED;
INIT_LIST_HEAD(&c->list_us);
INIT_LIST_HEAD(&c->list_to);
c->root = RB_ROOT;
return c;
}
void mrpc_conn_close(mrpc_connection_t *c)
{
if (ev_del_file_item(worker->ev, c->fd) < 0) {
E("remove event file item error fd %d, reason %s",
c->fd, strerror(errno));
}
close(c->fd);
c->conn_status = MRPC_CONN_DISCONNECTED;
}
void mrpc_conn_free(mrpc_connection_t *c)
{
mrpc_buf_free(c->send_buf);
mrpc_buf_free(c->recv_buf);
list_del(&c->list_us);
list_del(&c->list_to);
if (c->refs != 0) {
int r = hashtable_insert(stash_conns_table, &(c->fd), c);
if (r != -1) {
E("stash conns insert error!");
} else {
I("insert stash conn ok!");
}
return;
}
free(c);
}
static unsigned int svr_req_hash(void* id)
{
unsigned int ret = murmur_hash2(id, sizeof(unsigned int));
return ret;
}
static int svr_req_cmp_f(void* d1, void*d2)
{
//I("k1=%d, k2=%d", *((int*)d1), *((int*)d2));
return *((int*)d1) - *((int*)d2) == 0 ? 1 : 0;
}
void mrpc_init_stash_conns()
{
stash_conns_table = create_hashtable(8, svr_req_hash, svr_req_cmp_f);
}
void mrpc_check_stash_conns()
{
int keycount = hashtable_count(stash_conns_table);
if (keycount <= 0) return;
struct hashtable_itr *itr = hashtable_iterator(stash_conns_table);
if (itr == NULL) return;
int *keys = calloc(keycount + 1, sizeof(*keys));
int *p = keys;
do {
mrpc_connection_t *con = hashtable_iterator_value(itr);
if (con->conn_status == MRPC_CONN_DISCONNECTED && con->refs == 0) {
*p = con->fd; p++;
}
} while (hashtable_iterator_advance(itr));
p = keys;
while (*p != 0) {
mrpc_connection_t *conn = hashtable_remove(stash_conns_table, p);
if (conn == NULL) {
E("remove stash connection failed!");
++p;
continue;
}
free(conn);
++p;
}
free(keys);
free(itr);
}
int mrpc_send2(mrpc_buf_t *b, int fd)
{
int r = 0,n;
while (b->offset < b->size) {
n = send(fd, b->buf + b->offset, b->size - b->offset, MSG_NOSIGNAL);
D("sent %d bytes, b->offset %lu, b->size %lu", n, b->offset, b->size);
if (n > 0) {
b->offset += n;
r += n;
} else if (n == 0) {
E("send return 0");
break;
} else {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
break;
} else if (errno == EINTR) {
E("errno is EINTR");
} else {
E("send return error, reason %s", strerror(errno));
goto failed;
}
}
}
if (b->offset == b->size) {
mrpc_buf_reset(b);
}
return r;
failed:
return -1;
}
int mrpc_send(mrpc_connection_t *c)
{
return mrpc_send2(c->send_buf, c->fd);
}
int mrpc_recv2(mrpc_buf_t *b, int fd)
{
int r = 0, n, buf_avail;
while (1) {
if (b->len - b->size <= 0) {
if (mrpc_buf_enlarge(b) < 0) {
E("enlarge the recv buf error");
return 0;
}
}
buf_avail = b->len - b->size;
n = recv(fd, b->buf + b->size, buf_avail, 0);
D("recv %d bytes",n);
if (n < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK ) {
if (r > 0) return r;
return -1;
} else {
I("read error,errno is %d,reason %s",errno, strerror(errno));
return 0;
}
}
if (n == 0) {
I("reset by peer");
return 0;
}
b->size += n;
r += n;
if ((size_t)n < buf_avail) {
D("break from receive loop, recv enough");
break;
}
}
return r;
}
int mrpc_recv(mrpc_connection_t *c)
{
return mrpc_recv2(c->recv_buf, c->fd);
}
//return:
//1 OK, 0 not finish, -1 error
int mrpc_parse(mrpc_buf_t *b, mrpc_message_t *msg, mcp_appbean_proto *proto)
{
//parse the rpc packet
if ((b->size - b->offset) < 12) {
//not a full package
return 0;
}
//mask:
msg->mask = ntohl(*(uint32_t*)(b->buf + b->offset));
b->offset += 4;
if (msg->mask != 0x0badbee0 && msg->mask != 0x0badbee1) {
E("mask error, %x", msg->mask);
goto failed;
}
//package length
msg->package_length = ntohl(*(uint32_t*)(b->buf + b->offset));
b->offset += 4;
//not a full package
if (b->size - b->offset < msg->package_length - 8) {
b->offset -= 8;
return 0;
}
//header length
msg->header_length = ntohs(*(short*)(b->buf + b->offset));
b->offset += 2;
//skip the packet options
b->offset += 2;
D("unpack the req/resp header");
struct pbc_slice str = {b->buf + b->offset, msg->header_length};
int r;
if (msg->mask == 0x0badbee0) {
r = pbc_pattern_unpack(rpc_pat_mrpc_request_header, &str,
&msg->h.req_head);
} else {
r = pbc_pattern_unpack(rpc_pat_mrpc_response_header, &str,
&msg->h.resp_head);
D("resp_head.code %d", msg->h.resp_head.response_code);
}
if (r < 0) {
E("rpc unpack request header fail");
goto failed;
}
b->offset += msg->header_length;
D("unpack header finish");
//body
int32_t body_len = 0;
if (msg->mask == 0x0badbee0) {
body_len = msg->h.req_head.body_length -1;
} else {
body_len = msg->h.resp_head.body_length -1;
}
if (body_len < 0) {
body_len = 0;
D("body_len == 0");
}
if (body_len > 0) {
D("unpack the body, body_len is %d",body_len);
struct pbc_slice str1 = {b->buf + b->offset, body_len};
r =pbc_pattern_unpack(rpc_pat_mcp_appbean_proto, &str1, proto);
if ( r < 0) {
E("rpc unpack mcp_appbean_proto error");
return -1;
}
b->offset += body_len;
}
//skip the extentions
b->offset += msg->package_length - 12 - msg->header_length - body_len;
return 1;
failed:
return -1;
}