Error connecting to rethinkDB from golang

php editor Baicao encountered a problem when using golang to connect to rethinkDB. The error message that he could not connect to the rethinkDB server confused him. In response to this problem, he conducted a series of troubleshooting and debugging, and finally found a solution. In this article, we will discuss possible problems and solutions when connecting to rethinkDB from golang.

Question content

I use rethinkdb to run the docker container, and then run go file to connect to the database, but an error occurs when connecting.

Hello everyone. I need help with rethinkdb, I ran the docker container:

docker run --name rth -p 8100:8080 -d rethinkdb

Then visit http://localhost:8100 and there is the homepage of rethinkdb, so everythink is fine. But when I try to connect to the database from golang, I get some errors:

package main

import (  
    r "gopkg.in/rethinkdb/rethinkdb-go.v6"
    "log"
    "fmt"
)

func main() {
    _, err := r.connect(r.connectopts{
        address: "localhost:28015",
        database: "test",
    })
    if err != nil {
        fmt.println(err)
        log.fatal("could not connect")
    }
}

This error occurs after running go run main.go:

rethinkdb: dial tcp 127.0.0.1:28015: connect: connection refused
2023/05/18 01:38:39 could not connect
exit status 1

Thanks The reason this is happening is that the port is incorrect (28015), but if I change it, except port = 8100, I get the same problem. If I enter 8100 instead of 28015 and get this error:

rethinkdb: Unexpected EOF: HTTP/ 400 Bad Request

2023/05/18 01:38:52 Could not connect
exit status 1

Maybe someone knows how to solve this problem)

Workaround

-p 8100:8080 Map the port 8080 in the container to Port 8100 on the host. You are not mapping any other ports, so when you try to access any port other than 8100 (for example, 127.0.0.1:28015), your request will not reach the container. Something else on the host might be listening on that port, or there might not be anything listening.

You mentioned that you can access the admin interface at http://localhost:8100; if you check the logs you will notice something like:

listening for administrative http connections on port 8080
listening for client driver connections on port 28015

So the server is listening for connections on multiple ports. Port 8080 (mapped to 8100) is the management http interface, 28015 is used for driver connections (this is in the documentation). Your code is trying to connect to port 28015 (which is correct), but you have not mapped that port, so it is not accessible on the host; fix this:

docker run --name rth -p 8100:8080 -p 28015:28015 -d rethinkdb

This will map port 28015 in the container to port 28015 on the host (you can use a different host port if needed; just remember to update the code). We can now successfully connect to the following:

package main

import (
    "fmt"
    "log"

    r "gopkg.in/rethinkdb/rethinkdb-go.v6"
)

func main() {
    _, err := r.Connect(r.ConnectOpts{
        Address:  "localhost:28015",
        Database: "test",
    })
    if err != nil {
        fmt.Println(err)
        log.Fatal("Could not connect")
    }
    fmt.Println("Connected")
}

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