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fix message buffering

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This commit is contained in:
Felix Fietkau 2011-02-05 20:50:08 +01:00
parent f6a6b0d492
commit a84c6cac9a
3 changed files with 64 additions and 46 deletions
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70
ubusd.c
View file

@ -90,31 +90,56 @@ static int ubus_msg_writev(int fd, struct ubus_msg_buf *ub, int offset)
} }
} }
static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
{
if (cl->tx_queue[cl->txq_tail])
return;
cl->tx_queue[cl->txq_tail] = ub;
cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
}
/* takes the msgbuf reference */ /* takes the msgbuf reference */
void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub) void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
{ {
int written; int written;
if (cl->buf_head) if (!cl->tx_queue[cl->txq_cur]) {
goto queue;
written = ubus_msg_writev(cl->sock.fd, ub, 0); written = ubus_msg_writev(cl->sock.fd, ub, 0);
if (written > 0 && written < ub->len + sizeof(ub->hdr)) { if (written >= ub->len + sizeof(ub->hdr))
cl->buf_head_ofs = written; goto out;
if (written < 0)
written = 0;
cl->txq_ofs = written;
/* get an event once we can write to the socket again */ /* get an event once we can write to the socket again */
uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER); uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
goto queue;
} }
ubus_msg_enqueue(cl, ub);
out:
if (free)
ubus_msg_free(ub); ubus_msg_free(ub);
}
static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
{
return cl->tx_queue[cl->txq_cur];
}
static void ubus_msg_dequeue(struct ubus_client *cl)
{
struct ubus_msg_buf *ub = ubus_msg_head(cl);
if (!ub)
return; return;
queue: ubus_msg_free(ub);
ub = ubus_msg_unshare(ub); cl->txq_ofs = 0;
ub->next = NULL; cl->tx_queue[cl->txq_cur] = NULL;
*cl->buf_tail = ub; cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
cl->buf_tail = &ub->next;
} }
static void handle_client_disconnect(struct ubus_client *cl) static void handle_client_disconnect(struct ubus_client *cl)
@ -126,6 +151,9 @@ static void handle_client_disconnect(struct ubus_client *cl)
ubusd_free_object(obj); ubusd_free_object(obj);
} }
while (ubus_msg_head(cl))
ubus_msg_dequeue(cl);
ubus_free_id(&clients, &cl->id); ubus_free_id(&clients, &cl->id);
uloop_fd_delete(&cl->sock); uloop_fd_delete(&cl->sock);
close(cl->sock.fd); close(cl->sock.fd);
@ -138,11 +166,10 @@ static void client_cb(struct uloop_fd *sock, unsigned int events)
struct ubus_msg_buf *ub; struct ubus_msg_buf *ub;
/* first try to tx more pending data */ /* first try to tx more pending data */
while (cl->buf_head) { while ((ub = ubus_msg_head(cl))) {
struct ubus_msg_buf *ub = cl->buf_head;
int written; int written;
written = ubus_msg_writev(sock->fd, ub, cl->buf_head_ofs); written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
if (written < 0) { if (written < 0) {
switch(errno) { switch(errno) {
case EINTR: case EINTR:
@ -156,19 +183,16 @@ static void client_cb(struct uloop_fd *sock, unsigned int events)
if (written == 0) if (written == 0)
break; break;
cl->buf_head_ofs += written; cl->txq_ofs += written;
if (cl->buf_head_ofs < ub->len + sizeof(ub->hdr)) if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
break; break;
cl->buf_head_ofs = 0; ubus_msg_dequeue(cl);
cl->buf_head = ub->next;
if (!cl->buf_head)
cl->buf_tail = &cl->buf_head;
} }
/* prevent further ULOOP_WRITE events if we don't have data /* prevent further ULOOP_WRITE events if we don't have data
* to send anymore */ * to send anymore */
if (!cl->buf_head && (events & ULOOP_WRITE)) if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER); uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
retry: retry:
@ -220,7 +244,7 @@ retry:
} }
out: out:
if (!sock->eof || cl->buf_head) if (!sock->eof || ubus_msg_head(cl))
return; return;
disconnect: disconnect:

22
ubusd.h
View file

@ -14,7 +14,6 @@
#define UBUS_OBJ_HASH_BITS 4 #define UBUS_OBJ_HASH_BITS 4
struct ubus_msg_buf { struct ubus_msg_buf {
struct ubus_msg_buf *next;
uint32_t refcount; /* ~0: uses external data buffer */ uint32_t refcount; /* ~0: uses external data buffer */
struct ubus_msghdr hdr; struct ubus_msghdr hdr;
struct blob_attr *data; struct blob_attr *data;
@ -25,22 +24,17 @@ struct ubus_client {
struct ubus_id id; struct ubus_id id;
struct uloop_fd sock; struct uloop_fd sock;
struct list_head objects;
struct ubus_msg_buf *tx_queue[UBUSD_CLIENT_BACKLOG];
unsigned int txq_cur, txq_tail, txq_ofs;
struct ubus_msg_buf *pending_msg;
int pending_msg_offset;
struct { struct {
struct ubus_msghdr hdr; struct ubus_msghdr hdr;
struct blob_attr data; struct blob_attr data;
} hdrbuf; } hdrbuf;
struct list_head objects;
int pending_msg_offset;
struct ubus_msg_buf *pending_msg;
unsigned int buf_head_ofs;
struct ubus_msg_buf *buf_head;
struct ubus_msg_buf **buf_tail;
struct ubus_msg_buf *requests[UBUSD_CLIENT_BACKLOG];
unsigned int req_head, req_tail;
}; };
struct ubus_path { struct ubus_path {
@ -49,7 +43,7 @@ struct ubus_path {
}; };
struct ubus_msg_buf *ubus_msg_new(void *data, int len, bool shared); struct ubus_msg_buf *ubus_msg_new(void *data, int len, bool shared);
void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub); void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free);
struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub); struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub);
void ubus_msg_free(struct ubus_msg_buf *ub); void ubus_msg_free(struct ubus_msg_buf *ub);

14
ubusd_proto.c
View file

@ -58,14 +58,14 @@ bool ubusd_send_hello(struct ubus_client *cl)
return false; return false;
ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id); ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id);
ubus_msg_send(cl, ub); ubus_msg_send(cl, ub, true);
return true; return true;
} }
static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr) static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
{ {
ub->hdr.type = UBUS_MSG_DATA; ub->hdr.type = UBUS_MSG_DATA;
ubus_msg_send(cl, ubus_msg_ref(ub)); ubus_msg_send(cl, ub, false);
return 0; return 0;
} }
@ -86,7 +86,7 @@ static int ubusd_handle_publish(struct ubus_client *cl, struct ubus_msg_buf *ub,
if (!ub) if (!ub)
return UBUS_STATUS_NO_DATA; return UBUS_STATUS_NO_DATA;
ubus_msg_send(cl, ub); ubus_msg_send(cl, ub, true);
return 0; return 0;
} }
@ -111,7 +111,7 @@ static void ubusd_send_obj(struct ubus_client *cl, struct ubus_msg_buf *ub, stru
if (!ub) if (!ub)
return; return;
ubus_msg_send(cl, ub); ubus_msg_send(cl, ub, true);
} }
static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr) static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
@ -195,7 +195,7 @@ static int ubusd_handle_invoke(struct ubus_client *cl, struct ubus_msg_buf *ub,
ub->hdr.type = UBUS_MSG_INVOKE; ub->hdr.type = UBUS_MSG_INVOKE;
ub->hdr.peer = cl->id.id; ub->hdr.peer = cl->id.id;
ubus_msg_send(obj->client, ub); ubus_msg_send(obj->client, ub, true);
return -1; return -1;
} }
@ -221,7 +221,7 @@ static int ubusd_handle_response(struct ubus_client *cl, struct ubus_msg_buf *ub
goto error; goto error;
ub->hdr.peer = blob_get_int32(attr[UBUS_ATTR_OBJID]); ub->hdr.peer = blob_get_int32(attr[UBUS_ATTR_OBJID]);
ubus_msg_send(cl, ub); ubus_msg_send(cl, ub, true);
return -1; return -1;
error: error:
@ -260,7 +260,7 @@ void ubusd_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
ubus_msg_free(ub); ubus_msg_free(ub);
*retmsg_data = htonl(ret); *retmsg_data = htonl(ret);
ubus_msg_send(cl, ubus_msg_ref(retmsg)); ubus_msg_send(cl, retmsg, false);
} }
static void __init ubusd_proto_init(void) static void __init ubusd_proto_init(void)