Prompt for calling the method of connecting to the database

[bouyeijiang]

actix-rt|system:0|arbiter:0' panicked at 'Cannot start a runtime from within a runtime. This happens because a function (like block_on) attempted to block the current thread while the thread is being used to drive asynchronous tasks

[robjtede]

There's not a lot we can do to help without knowing a lot more about your code. Either way, you can't call block_on within a request handler so if you are doing that somewhere it needs to be replaced with an async version. Eg. using reqwest::blocking is a common mistake like this.

[bouyeijiang]

the code method is shown in the following picture

[bouyeijiang]

query database method:

pub fn db_query_r(conf: &mut Dbcfg, command_text: &str) -> Vec<Row> {
    let mut client = db_connect(conf).unwrap();

    let rt = db_query(&mut client, command_text).unwrap();

    rt
}

[robjtede]

Almost certainly that db_connect is causing the problem. What crate are you using for accessing the database? Are db_connect and db_query your functions?

[bouyeijiang]

postgres="0.19.2"

yeah!

pub fn db_query(client: &mut Client, command_text: &str) -> Result<Vec<Row>, Error> {
    let rt = client.query(command_text, &[]);
    rt
}

[robjtede]

This crate is a lightweight wrapper over tokio-postgres. The postgres::Client is simply a wrapper around a tokio_postgres::Client along side a tokio Runtime. The client simply blocks on the futures provided by the async client.

• https://docs.rs/postgres/latest/postgres/#implementation

So you need to use tokio-postgres instead.

[bouyeijiang]

async/await, i see. thinks!