namespace meshlink {
class mesh;
class node;
+ class channel;
/// Severity of log messages generated by MeshLink.
typedef meshlink_log_level_t log_level_t;
*/
typedef void (*log_cb_t)(mesh *mesh, log_level_t level, const char *text);
+ /// A callback for accepting incoming channels.
+ /** @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the incoming channel.
+ * @param node The node from which this channel is being initiated.
+ * @param port The port number the peer wishes to connect to.
+ * @param data A pointer to a buffer containing data already received. (Not yet used.)
+ * @param len The length of the data. (Not yet used.)
+ *
+ * @return This function should return true if the application accepts the incoming channel, false otherwise.
+ * If returning false, the channel is invalid and may not be used anymore.
+ */
+ typedef bool (*channel_accept_cb_t)(mesh *mesh, channel *channel, node *node, uint16_t port, const void *data, size_t len);
+
+ /// A callback for receiving data from a channel.
+ /** @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ * @param data A pointer to a buffer containing data sent by the source.
+ * @param len The length of the data.
+ */
+ typedef void (*channel_receive_cb_t)(mesh *mesh, channel *channel, const void *data, size_t len);
+
/// A class describing a MeshLink node.
class node: public meshlink_node_t {
};
+ /// A class describing a MeshLink channel.
+ class channel: public meshlink_channel_t {
+ };
+
/// A class describing a MeshLink mesh.
class mesh: public meshlink_handle_t {
public:
* @param nodes A pointer to an array of pointers to meshlink::node, which should be allocated by the application.
* @param nmemb The maximum number of pointers that can be stored in the nodes array.
*
- * @return The number of known nodes. This can be larger than nmemb, in which case not all nodes were stored in the nodes array.
+ * @return The number of known nodes, or -1 in case of an error.
+ * This can be larger than nmemb, in which case not all nodes were stored in the nodes array.
*/
- size_t get_all_nodes(node **nodes, size_t nmemb) {
+ ssize_t get_all_nodes(node **nodes, size_t nmemb) {
return meshlink_get_all_nodes(this, (meshlink_node_t **)nodes, nmemb);
}
void blacklist(node *node) {
return meshlink_blacklist(this, node);
}
+
+ /// Set the accept callback.
+ /** This functions sets the callback that is called whenever another node sends data to the local node.
+ * The callback is run in MeshLink's own thread.
+ * It is therefore important that the callback uses apprioriate methods (queues, pipes, locking, etc.)
+ * to hand the data over to the application's thread.
+ * The callback should also not block itself and return as quickly as possible.
+ *
+ * @param channel A handle for the channel.
+ * @param cb A pointer to the function which will be called when another node sends data to the local node.
+ */
+ void set_channel_accept_cb(channel *channel, channel_accept_cb_t cb) {
+ return meshlink_set_channel_accept_cb(this, (meshlink_channel_accept_cb_t)cb);
+ }
+
+ /// Open a reliable stream channel to another node.
+ /** This function is called whenever a remote node wants to open a channel to the local node.
+ * The application then has to decide whether to accept or reject this channel.
+ *
+ * @param node The node to which this channel is being initiated.
+ * @param port The port number the peer wishes to connect to.
+ * @param cb A pointer to the function which will be called when the remote node sends data to the local node.
+ * @param data A pointer to a buffer containing data to already queue for sending.
+ * @param len The length of the data.
+ *
+ * @return A handle for the channel, or NULL in case of an error.
+ */
+ channel *channel_open(node *node, uint16_t port, channel_receive_cb_t cb, const void *data, size_t len) {
+ return (channel *)meshlink_channel_open(this, node, port, (meshlink_channel_receive_cb_t)cb, data, len);
+ }
+
+ /// Partially close a reliable stream channel.
+ /** This shuts down the read or write side of a channel, or both, without closing the handle.
+ * It can be used to inform the remote node that the local node has finished sending all data on the channel,
+ * but still allows waiting for incoming data from the remote node.
+ *
+ * @param channel A handle for the channel.
+ * @param direction Must be one of SHUT_RD, SHUT_WR or SHUT_RDWR.
+ */
+ void channel_shutdown(channel *channel, int direction) {
+ return meshlink_channel_shutdown(this, channel, direction);
+ }
+
+ /// Close a reliable stream channel.
+ /** This informs the remote node that the local node has finished sending all data on the channel.
+ * It also causes the local node to stop accepting incoming data from the remote node.
+ * Afterwards, the channel handle is invalid and must not be used any more.
+ *
+ * @param channel A handle for the channel.
+ */
+ void channel_close(meshlink_channel_t *channel) {
+ return meshlink_channel_close(this, channel);
+ }
+
+ /// Transmit data on a channel
+ /** This queues data to send to the remote node.
+ *
+ * @param channel A handle for the channel.
+ * @param data A pointer to a buffer containing data sent by the source.
+ * @param len The length of the data.
+ *
+ * @return The amount of data that was queued, which can be less than len, or a negative value in case of an error.
+ */
+ ssize_t channel_send(channel *channel, void *data, size_t len) {
+ return meshlink_channel_send(this, channel, data, len);
+ }
+
};
/// Initialize MeshLink's configuration directory.
static void close(mesh *mesh) {
meshlink_close(mesh);
}
+
+ static const char *strerror(errno_t err = meshlink_errno) {
+ return meshlink_strerror(err);
+ }
};
#endif // MESHLINKPP_H
projects / meshlink / blobdiff