You might be able to do what you need with net.Pipe which basically gives you both ends of a connection (think, after .Accept()) server, client := net.Pipe() go func() { // Do some stuff server.Close() }() // Do some stuff client.Close()
The network stack, as in “the code”, is definitely not in the container, it’s in the kernel of which there’s only one shared by the host and all containers (you already knew this). What each container has is its own separate network namespace, which means it has its own network interfaces and routing tables. Here’s … Read more
Reading quickly through the source it seems that you’re not far off. The following link should help (I did something similar but for FTP). For a file send from server to client, you start off with a file instance and an array of bytes. You then read the File into the byte array and write … Read more
You, my friend, are confusing the functionality of two different layers. TCP is connection oriented in the sense that there’s a connection establishment, between the two ends where they may negotiate different things like congestion-control mechanism among other things. The transport layer protocols’ general purpose is to provide process-to-process delivery meaning that it doesn’t know … Read more
I tried the websocket_*_timeout which are not supported on nginx 1.7.1 (it gives: unknown directive). However setting a high proxy_*_timeout works: proxy_connect_timeout 7d; proxy_send_timeout 7d; proxy_read_timeout 7d; 7d means 7 days, see official nginx configuration reference Additionally you probably only have to set the proxy_read_timeout 7d; as that’s the one that usually matter unless the … Read more
The main advantage of Netty over simply reading from and writing to sockets using streams is that Netty supports non-blocking, asynchronous I/O (using Java’s NIO API); when you use streams to read and write from sockets (and you start a new thread for each connected accepted from a ServerSocket) you are using blocking, synchronous I/O. … Read more
My current solution: def get_open_port(): import socket s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind((“”,0)) s.listen(1) port = s.getsockname()[1] s.close() return port Not very nice and also not 100% correct but it works for now.
TCP: Size of Ethernet frame – 24 Bytes Size of IPv4 Header (without any options) – 20 bytes Size of TCP Header (without any options) – 20 Bytes Total size of an Ethernet Frame carrying an IP Packet with an empty TCP Segment – 24 + 20 + 20 = 64 bytes UDP: Size of … Read more
< and > are usually used to redirect IOs. What does it mean there? Is it usable in another context? How? It’s the same – input and output is redirected to fd 5. Why does it work, while /dev/tcp doesn’t exists? It’s a special file: If host is a valid hostname or Internet address, and … Read more
I’ve been reading the The ultimate SO_LINGER page, or: why is my tcp not reliable blog post a lot. I recommend you read it too. It discusses edge cases of large data transfers with regards to TCP sockets. I’m not the expert at SO_LINGER, but on my server code (still in active development) I do … Read more