Struct async_nats::jetstream::stream::Stream

pub struct Stream { /* private fields */ }

Handle to operations that can be performed on a Stream.

Implementations

impl Stream

pub async fn info(&mut self) -> Result<&Info, Error>

Retrieves info about Stream from the server, updates the cached info inside Stream and returns it.

Examples

let client = async_nats::connect("localhost:4222").await?;
let jetstream = async_nats::jetstream::new(client);

let mut stream = jetstream
    .get_stream("events").await?;

let info = stream.info().await?;

pub fn cached_info(&self) -> &Info

Returns cached Info for the Stream. Cache is either from initial creation/retrival of the Stream or last call to Stream::info.

Examples

let client = async_nats::connect("localhost:4222").await?;
let jetstream = async_nats::jetstream::new(client);

let stream = jetstream
    .get_stream("events").await?;

let info = stream.cached_info();

pub async fn get_raw_message(&self, sequence: u64) -> Result<RawMessage, Error>

Get a raw message from the stream.

Examples

#[tokio::main]
use futures::StreamExt;
use futures::TryStreamExt;

let client = async_nats::connect("localhost:4222").await?;
let context = async_nats::jetstream::new(client);

let stream = context.get_or_create_stream(async_nats::jetstream::stream::Config {
    name: "events".to_string(),
    max_messages: 10_000,
    ..Default::default()
}).await?;

let publish_ack = context.publish("events".to_string(), "data".into()).await?;
let raw_message = stream.get_raw_message(publish_ack.sequence).await?;
println!("Retreived raw message {:?}", raw_message);

pub async fn get_last_raw_message_by_subject(
    &self,
    stream_subject: &str
) -> Result<RawMessage, Error>

Get the last raw message from the stream by subject.

Examples

#[tokio::main]
use futures::StreamExt;
use futures::TryStreamExt;

let client = async_nats::connect("localhost:4222").await?;
let context = async_nats::jetstream::new(client);

let stream = context.get_or_create_stream(async_nats::jetstream::stream::Config {
    name: "events".to_string(),
    max_messages: 10_000,
    ..Default::default()
}).await?;

let publish_ack = context.publish("events".to_string(), "data".into()).await?;
let raw_message = stream.get_last_raw_message_by_subject("events".into()).await?;
println!("Retreived raw message {:?}", raw_message);

pub async fn delete_message(&self, sequence: u64) -> Result<bool, Error>

Delete a message from the stream.

Examples

let client = async_nats::connect("localhost:4222").await?;
let context = async_nats::jetstream::new(client);

let stream = context.get_or_create_stream(async_nats::jetstream::stream::Config {
    name: "events".to_string(),
    max_messages: 10_000,
    ..Default::default()
}).await?;

let publish_ack = context.publish("events".to_string(), "data".into()).await?;
stream.delete_message(publish_ack.sequence).await?;

pub async fn purge(&self) -> Result<PurgeResponse, Error>

Purge Stream messages.

Examples

#[tokio::main]

async fn main() -> Result<(), async_nats::Error> {

let client = async_nats::connect(“demo.nats.io”).await?; let jetstream = async_nats::jetstream::new(client);

let stream = jetstream.get_stream(“events”).await?; stream.purge().await?;

Ok(())

}

pub async fn purge_subject<T>(&self, subject: T) -> Result<PurgeResponse, Error> where
    T: Into<String>, 

Purge Stream messages for a matching subject.

Examples

#[tokio::main]

async fn main() -> Result<(), async_nats::Error> {

let client = async_nats::connect(“demo.nats.io”).await?; let jetstream = async_nats::jetstream::new(client);

let stream = jetstream.get_stream(“events”).await?; stream.purge_subject(“data”).await?;

Ok(())

}

pub async fn create_consumer<C: IntoConsumerConfig + FromConsumer>(
    &self,
    config: C
) -> Result<Consumer<C>, Error>

Create a new Durable or Ephemeral Consumer (if durable_name was not provided) and returns the info from the server about created Consumer

Examples

use async_nats::jetstream::consumer;
let client = async_nats::connect("localhost:4222").await?;
let jetstream = async_nats::jetstream::new(client);

let stream = jetstream.get_stream("events").await?;
let info = stream.create_consumer(consumer::pull::Config {
    durable_name: Some("pull".to_string()),
    ..Default::default()
}).await?;

pub async fn consumer_info<T: AsRef<str>>(&self, name: T) -> Result<Info, Error>

Retrieve Info about Consumer from the server.

Examples

use async_nats::jetstream::consumer;
let client = async_nats::connect("localhost:4222").await?;
let jetstream = async_nats::jetstream::new(client);

let stream = jetstream.get_stream("events").await?;
let info = stream.consumer_info("pull").await?;

pub async fn get_consumer<T: FromConsumer + IntoConsumerConfig>(
    &self,
    name: &str
) -> Result<Consumer<T>, Error>

Get Consumer from the the server. Consumer iterators can be used to retrieve Messages for a given Consumer.

Examples

use async_nats::jetstream::consumer;
use futures::StreamExt;
let client = async_nats::connect("localhost:4222").await?;
let jetstream = async_nats::jetstream::new(client);

let stream = jetstream.get_stream("events").await?;
let consumer: consumer::PullConsumer = stream.get_consumer("pull").await?;

pub async fn get_or_create_consumer<T: FromConsumer + IntoConsumerConfig>(
    &self,
    name: &str,
    config: T
) -> Result<Consumer<T>, Error>

Create a Consumer with the given configuration if it is not present on the server. Returns a handle to the Consumer.

Note: This does not validate if the Consumer on the server is compatible with the configuration passed in except Push/Pull compatibility.

Examples

use async_nats::jetstream::consumer;
use futures::StreamExt;
let client = async_nats::connect("localhost:4222").await?;
let jetstream = async_nats::jetstream::new(client);

let stream = jetstream.get_stream("events").await?;
let consumer = stream.get_or_create_consumer("pull", consumer::pull::Config {
    durable_name: Some("pull".to_string()),
    ..Default::default()
}).await?;

pub async fn delete_consumer(&self, name: &str) -> Result<DeleteStatus, Error>

Delete a Consumer from the server.

Examples

use async_nats::jetstream::consumer;
use futures::StreamExt;
let client = async_nats::connect("localhost:4222").await?;
let jetstream = async_nats::jetstream::new(client);

jetstream.get_stream("events").await?
    .delete_consumer("pull").await?;

Trait Implementations

impl Debug for Stream

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.