added Uuid v1 with random node support

[liuchong]

added Uuid v1 with random node support
TODO: support generate node with a real MAC.

In fact in some situations such as in docker, the MAC is virtual. so I think to use a random node seem to be ok then.

please refer to: https://docs.docker.com/v1.8/articles/networking/

[alexcrichton]

Unfortunately the unsafe code here isn't thread-safe, and it seems like trying to guess the MAC of the machine we're one is somewhat of a lost cause? Perhaps this could take the timestamp and the MAC as inputs to the constructor?

[liuchong]

The "node" and "clock_seq" as given arguments are already in the fn "get_v1", I changed it's name to "new_v1_of". then added another commit to init the static_node use std::sync::{ONCE_INIT, Once}, is it ok that I've added an "extern crate std"?

[alexcrichton]

Ah sorry, I mean that this should continue to not have a dependency on either std or time. Instead the Uuid::new_v1 could be the only function added here and it could take two arguments, one for the MAC address and one for the timestamp perhaps?

[liuchong]

9108a02
Do you mean like this? (also, what do you think of if the clock_seq need to be in the parameters list?)

seems some usless, and it's almost the same as "from_fields".

[alexcrichton]

Yeah I was thinking something like that (although also not having optional parameters which were in turn randomly generated).

I don't think we're really poised to fully provide V1 UUID generation because we don't have a robust method of figuring out what the local MAC address is?

[liuchong]

close for now