Refactored and separate library into crates

[zonyitoo]

• shadowsocks: the core shadowsocks library
• shadowsocks-service:
  • server
  • manager
  • local
    • socks5, socks4/4a
    • tunnel
    • http/https
    • redir
    • dns
• shadowsocks-rust: release binaries
• tests

ref #326.

This PR will also fixes #343 , #232 .

[madeye]

I think this PR is almost ready for shadowsocks-android.

BTW, still see one warning:

warning: unused import: `ErrorKind`  --> crates/shadowsocks-service/src/local/socks/server/mod.rs:4:16 

[zonyitoo]

There still have some dependencies that migrating to tokio v0.3 are not released.

[cg31]

This is a good move. But how am I supposed to use the crates from other project?

It seems I can't refer to both shadowsocks and shadowsocks-service on github:

[dependencies]
shadowsocks = { git = "https://github.com/shadowsocks/shadowsocks-rust.git", branch = "master" }
# or ???
shadowsocks-server = { git = "https://github.com/shadowsocks/shadowsocks-rust.git", branch = "master" }

I can only clone them to local and use them:

[dependencies]
shadowsocks = { path = "./shadowsocks/crates/shadowsocks" }
shadowsocks-service = { path = "./shadowsocks/crates/shadowsocks-service" }

but this is rather awkward.

[zonyitoo]

[dependencies]
shadowsocks = { git = "https://github.com/shadowsocks/shadowsocks-rust.git", branch = "master" }
shadowsocks-service = { git = "https://github.com/shadowsocks/shadowsocks-rust.git", branch = "master" }

It should work.

[Mygod]

What is DnsClientCache? Caching should be handled by shadowsocks-android since shadowsocks-rust is oblivious to underlying network changes.

[zonyitoo]

What is DnsClientCache? Caching should be handled by shadowsocks-android since shadowsocks-rust is oblivious to underlying network changes.

Just for preventing creating sockets for every queries.

If the underlying network changed, which will definitely cause query failure, then the DnsClientCache will automatically recreate sockets and do it again.

[Mygod]

Does this fix shadowsocks/shadowsocks-android#2093?

[Mygod]

Also according to rfc7766, connection reuse can send multiple queries in a single connection. 🤔

[zonyitoo]

Does this fix shadowsocks/shadowsocks-android#2093?

Well, the DnsClientCache should achieve the goal of DNS connection reuse (TCP).