How do i setup Rocket with redis + connection pool?

[patchthecode]

How do i setup Rocket with redis + connection pool?

The documentation wasnt very clear for me, and tutorials online do not work for version 0.5.0-rc.2
Could you provide an example or guide me to what documentation i should look at that gives a redis example? Many of the examples use SQL

[ELD]

Are you wanting to set up a connection pool for Redis or do you want both a connection pool for Redis and a separate connection pool for a No/SQL database (e.g. Postgres, MongoDB, etc)?

For either, using Rocket 0.5.0-rc.2, you should be good to use the rocket_db_pools crate.

(I'm assuming you want Redis and a SQL database connection pool)
(Also, I haven't tested this, so some things may be slightly incorrect or use paths might be wrong)

In your Cargo.toml:

# ...
[dependencies]
rocket = "0.5.0-rc.2"
rocket_db_pools = { version = "0.1.0-rc.2", features = [ "deadpool_redis", "sqlx_postgres" ] }
# ...

Now in your main.rs (or similar, or separate modules, depending on code organization)

use rocket_db_pools::{Connection, Database, deadpool_redis, sqlx};
use rocket::{launch, get};

#[derive(Database)]
#[database("redis_pool")]
pub RedisPool(deadpool_redis::Pool);

#[derive(Database)]
#[database("postgres_pool")]
pub PostgresPool(sqlx::PgPool);

#[get("/")]
async fn test_route(redis: Connection<RedisPool>, pg: Connection<PostgresPool>) {
    // ...
}

#[launch]
fn rocket() -> _ {
    rocket::ignite()
        .attach(RedisPool::init())
        .attach(PostgresPool::init())
}

Finally, either in environment variables or in your Rocket.toml:

[default.databases.redis_pool]
url = "..."

[default.databases.postgres_pool]
url = "..."

In general, review the rocket_db_pools docs for more information and a basic example using SQLite (it's very similar for Redis): https://api.rocket.rs/v0.5-rc/rocket_db_pools/index.html

[patchthecode]

thanks sir!

[patchthecode]

@ELD

Hi sir. I have followed your instructions. Everything works 100% ...in development, and in production as a stand alone file.

I have one last question. When I take the same build (that works in dev, and in release) and I build it for docker. I get this error when the file is run

Error: failed to initialize database: bad configuration: missing field `url`
Error: FailedFairings([Info { name: "'redis' Database Pool", kind: Kind(1) }])

i am really stumped on what the issue is because i do have the url configured in my Rocket.toml file

[default.databases.redis]
url = "redis://localhost:6380"

min_connections = 64
max_connections = 1024
connect_timeout = 3
idle_timeout = 120

[default]
address = "0.0.0.0"
port = 8083


[debug]
# workers = [number of cpus * 2]
keep_alive = 5
read_timeout = 5
write_timeout = 5
log = "normal"
# secret_key = [randomly generated at launch]
limits = { forms = 32768 }

[release]
secret_key = "hPRYyVRiMyxpw5sBB1XeCMN1kFsDCqKvBi2QJxBVHQk="

[ELD]

Could you include your Dockerfile so I can see if anything is wrong with it?

[patchthecode]

I have pasted the docker file below. I can even host the project on github if needed.

[patchthecode]

--deleted--

so i found out what the issue was.
I seems at even though the file is compiled to an executable, it still needs the Rocket.toml file... this is confusing.
I thought the executable had everything it needs already.

So the fix in my Dockerfile was to copy the Rocket.toml file next to the executable and then it works 😕

[ELD]

Glad you figured it out! Yeah, I suspected the Rocket.toml file wasn't being copied into the container, but I wasn't sure.

[SergioBenitez]

--deleted--

so i found out what the issue was.

I seems at even though the file is compiled to an executable, it still needs the Rocket.toml file... this is confusing.

I thought the executable had everything it needs already.

So the fix in my Dockerfile was to copy the Rocket.toml file next to the executable and then it works 😕

The idea is that you can change Rocket.toml without recompiling. It's a dynamic form of configuration. If you want configuration compiled in, just set it in the source code and eschew the Rocket.toml file entirely.

[patchthecode]

Dynamic configuration. Yes, the idea makes sense and i can see a lot of use cases with it. It just confused me because I didnt see this any where in documentation. (forgive me if i missed it 🙏)

[vizvasrj]

Is there any way witout using rocket.toml

[ImSingee]

Is there any way witout using rocket.toml

It's actually just using rocket::config. You can also use environment variables OOTB (see here). Or you can set it in your code manually.