Is go language dns asynchronous?

Go language dns is asynchronous. The net package in Go language provides support for network operations, including DNS resolution. When performing DNS resolution, Go language uses an asynchronous method to process it. Go language will use the asynchronous DNS resolution mechanism provided by the operating system. When a DNS query request is initiated, Go language will immediately return a placeholder object to indicate that resolution is in progress. At the same time, the Go language will hand over the actual DNS query operation to the operating system for processing, and notify the Go language runtime system after the query is completed.

The operating environment of this article: Windows 10 system, Go1.20.4 version, Dell G3 computer.

The DNS resolution process of Go language is asynchronous. The net package in Go language provides support for network operations, including DNS resolution. When performing DNS resolution, the Go language uses an asynchronous method to handle it.

In the Go language, you can use the ResolveIPAddr function of the net package to perform DNS resolution. This function will resolve the domain name to the corresponding IP address. When this function is called, the Go language will initiate a DNS query request, and then immediately return an object of type *IPAddr, indicating that resolution is in progress.

At the same time, the Go language also provides a Dial function for establishing a network connection. When calling the Dial function, if the incoming address is a domain name instead of an IP address, the Go language will automatically perform DNS resolution and use the resolved IP address to establish a connection.

During the DNS resolution process, the Go language will use the asynchronous DNS resolution mechanism provided by the operating system. When a DNS query request is initiated, the Go language will immediately return a placeholder object to indicate that the resolution is in progress. At the same time, the Go language will hand over the actual DNS query operation to the operating system for processing, and notify the Go language runtime system after the query is completed.

After receiving the DNS query results, the Go language will update the previously returned placeholder object and fill it with the parsed IP address and other information. In this way, in an asynchronous manner, the Go language can continue to execute the following code after the DNS resolution is completed without waiting for the completion of the DNS query.

It should be noted that although DNS resolution is asynchronous, you still need to wait for DNS resolution to be completed when establishing a network connection. Therefore, when using the Dial function to establish a network connection, if the incoming address is a domain name instead of an IP address, there will still be a certain delay.

To sum up, the DNS resolution process of Go language is asynchronous. Through the asynchronous method, the Go language can continue to execute other codes during the DNS resolution process, improving the concurrency performance of the program. At the same time, the Go language also provides a convenient network operation interface, making DNS resolution and establishing network connections easier and more efficient.

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