How Can a Go TCP Proxy Ensure Complete Data Transfer Without Knowing the Message Format in Advance?

Writing a Proxy in Go (Golang) Using TCP Connections

When creating a TCP proxy, data preservation is crucial. This article delves into the complexities of determining when all data from a server has been received, despite not knowing the message format in advance.

One strategy to resolve this issue is waiting after each socket read to ensure the proxy doesn't read faster than it receives data. However, concerns arise about timeout scenarios that prevent the proxy from distinguishing between empty sockets and delayed server responses.

An alternative approach involves comparing the time of the waiting call with the timeout value. If the waiting call exceeds the timeout, it's safe to assume the server has stopped writing, allowing the proxy to move on and close the connection.

Although this method may be effective in certain scenarios, such as tight data centers with minimal delays, it's important to acknowledge potential pitfalls. For instance, if the server only writes a single byte at a time and delays are significant, the proxy may incorrectly conclude it has received the entire message and terminate the transfer prematurely.

To mitigate potential deadlocks, consider using goroutines to handle separate read and write operations, ensuring one blocked operation doesn't halt the entire process.

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