ubus file descriptor passing and channel support #263
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When a function supports many parameters, the order can be somewhat
confusing, especially when dealing with several optional ones.
In order to make this easier to use, support for passing an object with
named parameters.
for example:
obj.notify("test", data, null, null, null, 1000);
can be written as:
obj.notify({
method: "test",
data,
timeout: 1000
});
Signed-off-by: Felix Fietkau <[email protected]>
This can be used to synchronously complete a deferred ubus request, waiting for completion or timeout. Signed-off-by: Felix Fietkau <[email protected]>
This can be used to send and receive file descriptors from within an object method call. Signed-off-by: Felix Fietkau <[email protected]>
File descriptors can be passed via the named fd argument Signed-off-by: Felix Fietkau <[email protected]>
Add a named parameter fd_cb, which is called when the callee returned a file descriptor. Signed-off-by: Felix Fietkau <[email protected]>
A channel is a context that is directly connected to a peer instead of going through ubusd. The use of this context is limited to calling ubus_invoke and receiving requests not bound to any registered object. The main use case for this is having a more stateful interaction between processes. A service using channels can attach metadata to each individual channel and keep track of its lifetime, which is not possible through the regular subscribe/notify mechanism. Using channels also improves request latency, since messages are passed directly between processes. A channel can either be opened by fd using ubus.open_channel(), or created from within a request by using req.new_channel(). When calling req.new_channel, the fd for the other side of the channel is automatically passed to the remote caller. Signed-off-by: Felix Fietkau <[email protected]>
nbd168
changed the title
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Happy new year!
These changes implement support for the various ways of passing file descriptors via ubus, as well as opening channels.