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authorJosé Bollo <jose.bollo@iot.bzh>2016-04-21 17:45:44 +0200
committerJosé Bollo <jose.bollo@iot.bzh>2016-04-21 17:45:44 +0200
commit5eaa2c12a8b89f8a16f0759db88d65b56c82918c (patch)
tree5ff91305ba212269b3b546f7dc33168b13d452af
parent45e4c16ed05d6b5fed969b08aa873d6c24b5f948 (diff)
websocket refactoring
Change-Id: Ia39ec6c01ce1fc6b3921b0433ab872d47ebdbbc4 Signed-off-by: José Bollo <jose.bollo@iot.bzh>
-rw-r--r--src/afb-ws.c320
-rw-r--r--src/afb-ws.h13
-rw-r--r--src/websock.c21
-rw-r--r--src/websock.h11
4 files changed, 273 insertions, 92 deletions
diff --git a/src/afb-ws.c b/src/afb-ws.c
index 2ebfbb93..da248c89 100644
--- a/src/afb-ws.c
+++ b/src/afb-ws.c
@@ -29,6 +29,9 @@
#include "utils-upoll.h"
+/*
+ * declaration of the websock interface for afb-ws
+ */
static ssize_t aws_writev(struct afb_ws *ws, const struct iovec *iov, int iovcnt);
static ssize_t aws_readv(struct afb_ws *ws, const struct iovec *iov, int iovcnt);
static void aws_on_close(struct afb_ws *ws, uint16_t code, size_t size);
@@ -36,7 +39,7 @@ static void aws_on_text(struct afb_ws *ws, int last, size_t size);
static void aws_on_binary(struct afb_ws *ws, int last, size_t size);
static void aws_on_continue(struct afb_ws *ws, int last, size_t size);
static void aws_on_readable(struct afb_ws *ws);
-static void aws_on_hangup(struct afb_ws *ws);
+static void aws_on_error(struct afb_ws *ws, uint16_t code, const void *data, size_t size);
static struct websock_itf aws_itf = {
.writev = (void*)aws_writev,
@@ -48,54 +51,113 @@ static struct websock_itf aws_itf = {
.on_text = (void*)aws_on_text,
.on_binary = (void*)aws_on_binary,
.on_continue = (void*)aws_on_continue,
- .on_extension = NULL
+ .on_extension = NULL,
+
+ .on_error = (void*)aws_on_error
};
+/*
+ * a common scheme of buffer handling
+ */
struct buf
{
char *buffer;
size_t size;
};
+/*
+ * the state
+ */
+enum state
+{
+ waiting,
+ reading_text,
+ reading_binary
+};
+
+/*
+ * the afb_ws structure
+ */
struct afb_ws
{
- int fd;
- enum { none, text, binary } type;
- const struct afb_ws_itf *itf;
- void *closure;
- struct websock *ws;
- struct upoll *up;
- struct buf buffer;
+ int fd; /* the socket file descriptor */
+ enum state state; /* current state */
+ const struct afb_ws_itf *itf; /* the callback interface */
+ void *closure; /* closure when calling the callbacks */
+ struct websock *ws; /* the websock handler */
+ struct upoll *up; /* the upoll handler for the socket */
+ struct buf buffer; /* the last read fragment */
};
+/*
+ * Returns the current buffer of 'ws' that is reset.
+ */
+static inline struct buf aws_pick_buffer(struct afb_ws *ws)
+{
+ struct buf result = ws->buffer;
+ ws->buffer.buffer = NULL;
+ ws->buffer.size = 0;
+ return result;
+}
+
+/*
+ * Disconnect the websocket 'ws' and calls on_hangup if
+ * 'call_on_hangup' is not null.
+ */
+static void aws_disconnect(struct afb_ws *ws, int call_on_hangup)
+{
+ struct websock *wsi = ws->ws;
+ if (wsi != NULL) {
+ ws->ws = NULL;
+ upoll_close(ws->up);
+ ws->up = NULL;
+ websock_destroy(wsi);
+ free(aws_pick_buffer(ws).buffer);
+ ws->state = waiting;
+ if (call_on_hangup && ws->itf->on_hangup)
+ ws->itf->on_hangup(ws->closure);
+ }
+}
+
+/*
+ * Creates the afb_ws structure for the file descritor
+ * 'fd' and the callbacks described by the interface 'itf'
+ * and its 'closure'.
+ *
+ * Returns the handle for the afb_ws created or NULL on error.
+ */
struct afb_ws *afb_ws_create(int fd, const struct afb_ws_itf *itf, void *closure)
{
struct afb_ws *result;
assert(fd >= 0);
+ /* allocation */
result = malloc(sizeof * result);
if (result == NULL)
goto error;
+ /* init */
result->fd = fd;
- result->type = none;
+ result->state = waiting;
result->itf = itf;
result->closure = closure;
+ result->buffer.buffer = NULL;
+ result->buffer.size = 0;
+ /* creates the websocket */
result->ws = websock_create_v13(&aws_itf, result);
if (result->ws == NULL)
goto error2;
+ /* creates the upoll */
result->up = upoll_open(result->fd, result);
if (result->up == NULL)
goto error3;
- result->buffer.buffer = NULL;
- result->buffer.size = 0;
-
+ /* init the upoll */
upoll_on_readable(result->up, (void*)aws_on_readable);
- upoll_on_hangup(result->up, (void*)aws_on_hangup);
+ upoll_on_hangup(result->up, (void*)afb_ws_hangup);
return result;
@@ -104,35 +166,92 @@ error3:
error2:
free(result);
error:
- close(fd);
return NULL;
}
-void afb_ws_disconnect(struct afb_ws *ws)
+/*
+ * Destroys the websocket 'ws'
+ * It first hangup (but without calling on_hangup for safety reasons)
+ * if needed.
+ */
+void afb_ws_destroy(struct afb_ws *ws)
{
- struct upoll *up = ws->up;
- struct websock *wsi = ws->ws;
- ws->up = NULL;
- ws->ws = NULL;
- upoll_close(up);
- websock_destroy(wsi);
+ aws_disconnect(ws, 0);
+ free(ws);
}
-void afb_ws_close(struct afb_ws *ws, uint16_t code)
+/*
+ * Hangup the websocket 'ws'
+ */
+void afb_ws_hangup(struct afb_ws *ws)
+{
+ aws_disconnect(ws, 1);
+}
+
+/*
+ * Sends a 'close' command to the endpoint of 'ws' with the 'code' and the
+ * 'reason' (that can be NULL and that else should not be greater than 123
+ * characters).
+ * Returns 0 on success or -1 in case of error.
+ */
+int afb_ws_close(struct afb_ws *ws, uint16_t code, const char *reason)
{
- websock_close_code(ws->ws, code, NULL, 0);
+ if (ws->ws == NULL) {
+ /* disconnected */
+ errno = EPIPE;
+ return -1;
+ }
+ return websock_close(ws->ws, code, reason, reason == NULL ? 0 : strlen(reason));
}
-void afb_ws_text(struct afb_ws *ws, const char *text, size_t length)
+/*
+ * Sends a 'close' command to the endpoint of 'ws' with the 'code' and the
+ * 'reason' (that can be NULL and that else should not be greater than 123
+ * characters).
+ * Raise an error after 'close' command is sent.
+ * Returns 0 on success or -1 in case of error.
+ */
+int afb_ws_error(struct afb_ws *ws, uint16_t code, const char *reason)
{
- websock_text(ws->ws, 1, text, length);
+ if (ws->ws == NULL) {
+ /* disconnected */
+ errno = EPIPE;
+ return -1;
+ }
+ return websock_error(ws->ws, code, reason, reason == NULL ? 0 : strlen(reason));
}
-void afb_ws_binary(struct afb_ws *ws, const void *data, size_t length)
+/*
+ * Sends a 'text' of 'length' to the endpoint of 'ws'.
+ * Returns 0 on success or -1 in case of error.
+ */
+int afb_ws_text(struct afb_ws *ws, const char *text, size_t length)
{
- websock_binary(ws->ws, 1, data, length);
+ if (ws->ws == NULL) {
+ /* disconnected */
+ errno = EPIPE;
+ return -1;
+ }
+ return websock_text(ws->ws, 1, text, length);
}
+/*
+ * Sends a binary 'data' of 'length' to the endpoint of 'ws'.
+ * Returns 0 on success or -1 in case of error.
+ */
+int afb_ws_binary(struct afb_ws *ws, const void *data, size_t length)
+{
+ if (ws->ws == NULL) {
+ /* disconnected */
+ errno = EPIPE;
+ return -1;
+ }
+ return websock_binary(ws->ws, 1, data, length);
+}
+
+/*
+ * callback for writing data
+ */
static ssize_t aws_writev(struct afb_ws *ws, const struct iovec *iov, int iovcnt)
{
ssize_t rc;
@@ -142,6 +261,9 @@ static ssize_t aws_writev(struct afb_ws *ws, const struct iovec *iov, int iovcnt
return rc;
}
+/*
+ * callback for reading data
+ */
static ssize_t aws_readv(struct afb_ws *ws, const struct iovec *iov, int iovcnt)
{
ssize_t rc;
@@ -155,25 +277,24 @@ static ssize_t aws_readv(struct afb_ws *ws, const struct iovec *iov, int iovcnt)
return rc;
}
+/*
+ * callback on incoming data
+ */
static void aws_on_readable(struct afb_ws *ws)
{
- if (websock_dispatch(ws->ws) < 0 && errno == EPIPE)
- afb_ws_disconnect(ws);
-}
+ int rc;
-static void aws_on_hangup(struct afb_ws *ws)
-{
- afb_ws_disconnect(ws);
-}
-
-static inline struct buf aws_pick_buffer(struct afb_ws *ws)
-{
- struct buf result = ws->buffer;
- ws->buffer.buffer = NULL;
- ws->buffer.size = 0;
- return result;
+ assert(ws->ws != NULL);
+ rc = websock_dispatch(ws->ws);
+ if (rc < 0 && errno == EPIPE)
+ afb_ws_hangup(ws);
}
+/*
+ * Reads from the websocket handled by 'ws' data of length 'size'
+ * and append it to the current buffer of 'ws'.
+ * Returns 0 in case of error or 1 in case of success.
+ */
static int aws_read(struct afb_ws *ws, size_t size)
{
ssize_t sz;
@@ -192,66 +313,107 @@ static int aws_read(struct afb_ws *ws, size_t size)
return 1;
}
+/*
+ * Callback when 'close' command received from 'ws' with 'code' and 'size'.
+ */
static void aws_on_close(struct afb_ws *ws, uint16_t code, size_t size)
{
struct buf b;
- ws->type = none;
- if (ws->itf->on_close == NULL)
+ ws->state = waiting;
+ free(aws_pick_buffer(ws).buffer);
+ if (ws->itf->on_close == NULL) {
websock_drop(ws->ws);
+ afb_ws_hangup(ws);
+ } else if (!aws_read(ws, size))
+ ws->itf->on_close(ws->closure, code, NULL, 0);
else {
- aws_read(ws, size);
b = aws_pick_buffer(ws);
ws->itf->on_close(ws->closure, code, b.buffer, b.size);
}
}
+/*
+ * Drops any incoming data and send an error of 'code'
+ */
+static void aws_drop_error(struct afb_ws *ws, uint16_t code)
+{
+ ws->state = waiting;
+ free(aws_pick_buffer(ws).buffer);
+ websock_drop(ws->ws);
+ websock_error(ws->ws, code, NULL, 0);
+}
+
+/*
+ * Reads either text or binary data of 'size' from 'ws' eventually 'last'.
+ */
+static void aws_continue(struct afb_ws *ws, int last, size_t size)
+{
+ struct buf b;
+ int istxt;
+
+ if (!aws_read(ws, size))
+ aws_drop_error(ws, WEBSOCKET_CODE_ABNORMAL);
+ else if (last) {
+ istxt = ws->state == reading_text;
+ ws->state = waiting;
+ b = aws_pick_buffer(ws);
+ b.buffer[b.size] = 0;
+ (istxt ? ws->itf->on_text : ws->itf->on_binary)(ws->closure, b.buffer, b.size);
+ }
+}
+
+/*
+ * Callback when 'text' message received from 'ws' with 'size' and possibly 'last'.
+ */
static void aws_on_text(struct afb_ws *ws, int last, size_t size)
{
- if (ws->type != none) {
- websock_drop(ws->ws);
- websock_close_code(ws->ws, WEBSOCKET_CODE_PROTOCOL_ERROR, NULL, 0);
- } else if (ws->itf->on_text == NULL) {
- websock_drop(ws->ws);
- websock_close_code(ws->ws, WEBSOCKET_CODE_CANT_ACCEPT, NULL, 0);
- } else {
- ws->type = text;
- aws_on_continue(ws, last, size);
+ if (ws->state != waiting)
+ aws_drop_error(ws, WEBSOCKET_CODE_PROTOCOL_ERROR);
+ else if (ws->itf->on_text == NULL)
+ aws_drop_error(ws, WEBSOCKET_CODE_CANT_ACCEPT);
+ else {
+ ws->state = reading_text;
+ aws_continue(ws, last, size);
}
}
+/*
+ * Callback when 'binary' message received from 'ws' with 'size' and possibly 'last'.
+ */
static void aws_on_binary(struct afb_ws *ws, int last, size_t size)
{
- if (ws->type != none) {
- websock_drop(ws->ws);
- websock_close_code(ws->ws, WEBSOCKET_CODE_PROTOCOL_ERROR, NULL, 0);
- } else if (ws->itf->on_binary == NULL) {
- websock_drop(ws->ws);
- websock_close_code(ws->ws, WEBSOCKET_CODE_CANT_ACCEPT, NULL, 0);
- } else {
- ws->type = text;
- aws_on_continue(ws, last, size);
+ if (ws->state != waiting)
+ aws_drop_error(ws, WEBSOCKET_CODE_PROTOCOL_ERROR);
+ else if (ws->itf->on_binary == NULL)
+ aws_drop_error(ws, WEBSOCKET_CODE_CANT_ACCEPT);
+ else {
+ ws->state = reading_binary;
+ aws_continue(ws, last, size);
}
}
+/*
+ * Callback when 'close' command received from 'ws' with 'code' and 'size'.
+ */
static void aws_on_continue(struct afb_ws *ws, int last, size_t size)
{
- struct buf b;
- int istxt;
+ if (ws->state == waiting)
+ aws_drop_error(ws, WEBSOCKET_CODE_PROTOCOL_ERROR);
+ else
+ aws_continue(ws, last, size);
+}
- if (ws->type == none) {
- websock_drop(ws->ws);
- websock_close_code(ws->ws, WEBSOCKET_CODE_PROTOCOL_ERROR, NULL, 0);
- } else {
- if (!aws_read(ws, size)) {
- aws_on_close(ws, WEBSOCKET_CODE_ABNORMAL, 0);
- } else if (last) {
- istxt = ws->type == text;
- ws->type = none;
- b = aws_pick_buffer(ws);
- b.buffer[b.size] = 0;
- (istxt ? ws->itf->on_text : ws->itf->on_binary)(ws->closure, b.buffer, b.size);
- }
- }
+/*
+ * Callback when 'close' command is sent to 'ws' with 'code' and 'size'.
+ */
+static void aws_on_error(struct afb_ws *ws, uint16_t code, const void *data, size_t size)
+{
+ if (ws->itf->on_error != NULL)
+ ws->itf->on_error(ws->closure, code, data, size);
+ else
+ afb_ws_hangup(ws);
}
+
+
diff --git a/src/afb-ws.h b/src/afb-ws.h
index 1faec65c..1ef61ad8 100644
--- a/src/afb-ws.h
+++ b/src/afb-ws.h
@@ -21,13 +21,18 @@ struct afb_ws;
struct afb_ws_itf
{
- void (*on_close) (void *, uint16_t code, char *, size_t size);
+ void (*on_close) (void *, uint16_t code, char *, size_t size); /* optional, if not set hangup is called */
void (*on_text) (void *, char *, size_t size);
void (*on_binary) (void *, char *, size_t size);
+ void (*on_error) (void *, uint16_t code, const void *, size_t size); /* optional, if not set hangup is called */
+ void (*on_hangup) (void *); /* optional, it is safe too call afb_ws_destroy within the callback */
};
extern struct afb_ws *afb_ws_create(int fd, const struct afb_ws_itf *itf, void *closure);
-extern void afb_ws_close(struct afb_ws *ws, uint16_t code);
-extern void afb_ws_text(struct afb_ws *ws, const char *text, size_t length);
-extern void afb_ws_binary(struct afb_ws *ws, const void *data, size_t length);
+extern void afb_ws_destroy(struct afb_ws *ws);
+extern void afb_ws_hangup(struct afb_ws *ws);
+extern int afb_ws_close(struct afb_ws *ws, uint16_t code, const char *reason);
+extern int afb_ws_error(struct afb_ws *ws, uint16_t code, const char *reason);
+extern int afb_ws_text(struct afb_ws *ws, const char *text, size_t length);
+extern int afb_ws_binary(struct afb_ws *ws, const void *data, size_t length);
diff --git a/src/websock.c b/src/websock.c
index 945ccd9d..afb832e8 100644
--- a/src/websock.c
+++ b/src/websock.c
@@ -146,15 +146,18 @@ static inline int websock_send(struct websock *ws, int last, int rsv1, int rsv2,
return websock_send_internal(ws, first, buffer, size);
}
-int websock_close(struct websock *ws)
+int websock_close_empty(struct websock *ws)
{
- return websock_send(ws, 1, 0, 0, 0, OPCODE_CLOSE, NULL, 0);
+ return websock_close(ws, WEBSOCKET_CODE_NOT_SET, NULL, 0);
}
-int websock_close_code(struct websock *ws, uint16_t code, const void *data, size_t length)
+int websock_close(struct websock *ws, uint16_t code, const void *data, size_t length)
{
unsigned char buffer[125];
+ if (code == WEBSOCKET_CODE_NOT_SET && length == 0)
+ return websock_send(ws, 1, 0, 0, 0, OPCODE_CLOSE, NULL, 0);
+
/* checks the length */
if (length > 123) {
errno = EINVAL;
@@ -203,6 +206,14 @@ int websock_binary(struct websock *ws, int last, const void *data, size_t length
return websock_send(ws, last, 0, 0, 0, OPCODE_BINARY, data, length);
}
+int websock_error(struct websock *ws, uint16_t code, const void *data, size_t size)
+{
+ int rc = websock_close(ws, code, data, size);
+ if (ws->itf->on_error != NULL)
+ ws->itf->on_error(ws->closure, code, data, size);
+ return rc;
+}
+
static int read_header(struct websock *ws)
{
if (ws->lenhead < ws->szhead) {
@@ -397,11 +408,11 @@ loop:
goto loop;
too_long_error:
- websock_close_code(ws, WEBSOCKET_CODE_MESSAGE_TOO_LARGE, NULL, 0);
+ websock_error(ws, WEBSOCKET_CODE_MESSAGE_TOO_LARGE, NULL, 0);
return 0;
protocol_error:
- websock_close_code(ws, WEBSOCKET_CODE_PROTOCOL_ERROR, NULL, 0);
+ websock_error(ws, WEBSOCKET_CODE_PROTOCOL_ERROR, NULL, 0);
return 0;
}
diff --git a/src/websock.h b/src/websock.h
index f06bc23d..dbb3b022 100644
--- a/src/websock.h
+++ b/src/websock.h
@@ -41,19 +41,22 @@ struct websock_itf {
ssize_t (*writev) (void *, const struct iovec *, int);
ssize_t (*readv) (void *, const struct iovec *, int);
- void (*on_ping) (void *, size_t size); /* if not NULL, responsible of pong */
- void (*on_pong) (void *, size_t size);
+ void (*on_ping) (void *, size_t size); /* optional, if not NULL, responsible of pong */
+ void (*on_pong) (void *, size_t size); /* optional */
void (*on_close) (void *, uint16_t code, size_t size);
void (*on_text) (void *, int last, size_t size);
void (*on_binary) (void *, int last, size_t size);
void (*on_continue) (void *, int last, size_t size);
int (*on_extension) (void *, int last, int rsv1, int rsv2, int rsv3, int opcode, size_t size);
+
+ void (*on_error) (void *, uint16_t code, const void *data, size_t size); /* optional */
};
struct websock;
-int websock_close(struct websock *ws);
-int websock_close_code(struct websock *ws, uint16_t code, const void *data, size_t length);
+int websock_close_empty(struct websock *ws);
+int websock_close(struct websock *ws, uint16_t code, const void *data, size_t length);
+int websock_error(struct websock *ws, uint16_t code, const void *data, size_t length);
int websock_ping(struct websock *ws, const void *data, size_t length);
int websock_pong(struct websock *ws, const void *data, size_t length);