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// Copyright 2020-2022 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//! Manage operations on a [Stream], create/delete/update [Consumer].
#[cfg(feature = "server_2_10")]
use std::collections::HashMap;
use std::{
fmt::{self, Debug, Display},
future::IntoFuture,
io::{self, ErrorKind},
pin::Pin,
str::FromStr,
task::Poll,
time::Duration,
};
use crate::{
error::Error, header::HeaderName, is_valid_subject, HeaderMap, HeaderValue, StatusCode,
};
use base64::engine::general_purpose::STANDARD;
use base64::engine::Engine;
use bytes::Bytes;
use futures::{future::BoxFuture, TryFutureExt};
use serde::{Deserialize, Deserializer, Serialize};
use serde_json::json;
use time::{serde::rfc3339, OffsetDateTime};
use super::{
consumer::{self, Consumer, FromConsumer, IntoConsumerConfig},
context::{RequestError, RequestErrorKind, StreamsError, StreamsErrorKind},
errors::ErrorCode,
message::{StreamMessage, StreamMessageError},
response::Response,
Context, Message,
};
pub type InfoError = RequestError;
#[derive(Clone, Debug, PartialEq)]
pub enum DirectGetErrorKind {
NotFound,
InvalidSubject,
TimedOut,
Request,
ErrorResponse(StatusCode, String),
Other,
}
impl Display for DirectGetErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::InvalidSubject => write!(f, "invalid subject"),
Self::NotFound => write!(f, "message not found"),
Self::ErrorResponse(status, description) => {
write!(f, "unable to get message: {} {}", status, description)
}
Self::Other => write!(f, "error getting message"),
Self::TimedOut => write!(f, "timed out"),
Self::Request => write!(f, "request failed"),
}
}
}
pub type DirectGetError = Error<DirectGetErrorKind>;
impl From<crate::RequestError> for DirectGetError {
fn from(err: crate::RequestError) -> Self {
match err.kind() {
crate::RequestErrorKind::TimedOut => DirectGetError::new(DirectGetErrorKind::TimedOut),
crate::RequestErrorKind::NoResponders => DirectGetError::new(DirectGetErrorKind::Other),
crate::RequestErrorKind::Other => {
DirectGetError::with_source(DirectGetErrorKind::Other, err)
}
}
}
}
impl From<serde_json::Error> for DirectGetError {
fn from(err: serde_json::Error) -> Self {
DirectGetError::with_source(DirectGetErrorKind::Other, err)
}
}
impl From<StreamMessageError> for DirectGetError {
fn from(err: StreamMessageError) -> Self {
DirectGetError::with_source(DirectGetErrorKind::Other, err)
}
}
#[derive(Clone, Debug, PartialEq)]
pub enum DeleteMessageErrorKind {
Request,
TimedOut,
JetStream(super::errors::Error),
}
impl Display for DeleteMessageErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Request => write!(f, "request failed"),
Self::TimedOut => write!(f, "timed out"),
Self::JetStream(err) => write!(f, "JetStream error: {}", err),
}
}
}
pub type DeleteMessageError = Error<DeleteMessageErrorKind>;
/// Handle to operations that can be performed on a `Stream`.
/// It's generic over the type of `info` field to allow `Stream` with or without
/// info contents.
#[derive(Debug, Clone)]
pub struct Stream<T = Info> {
pub(crate) info: T,
pub(crate) context: Context,
pub(crate) name: String,
}
impl Stream<Info> {
/// Retrieves `info` about [Stream] from the server, updates the cached `info` inside
/// [Stream] and returns it.
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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?;
/// # Ok(())
/// # }
/// ```
pub async fn info(&mut self) -> Result<&Info, InfoError> {
let subject = format!("STREAM.INFO.{}", self.info.config.name);
match self.context.request(subject, &json!({})).await? {
Response::Ok::<Info>(info) => {
self.info = info;
Ok(&self.info)
}
Response::Err { error } => Err(error.into()),
}
}
/// Returns cached [Info] for the [Stream].
/// Cache is either from initial creation/retrieval of the [Stream] or last call to
/// [Stream::info].
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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();
/// # Ok(())
/// # }
/// ```
pub fn cached_info(&self) -> &Info {
&self.info
}
}
impl<I> Stream<I> {
/// Retrieves `info` about [Stream] from the server. Does not update the cache.
/// Can be used on Stream retrieved by [Context::get_stream_no_info]
pub async fn get_info(&self) -> Result<Info, InfoError> {
let subject = format!("STREAM.INFO.{}", self.name);
match self.context.request(subject, &json!({})).await? {
Response::Ok::<Info>(info) => Ok(info),
Response::Err { error } => Err(error.into()),
}
}
/// Gets next message for a [Stream].
///
/// Requires a [Stream] with `allow_direct` set to `true`.
/// This is different from [Stream::get_raw_message], as it can fetch [Message]
/// from any replica member. This means read after write is possible,
/// as that given replica might not yet catch up with the leader.
///
/// # Examples
///
/// ```no_run
/// # #[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
/// .create_stream(async_nats::jetstream::stream::Config {
/// name: "events".to_string(),
/// subjects: vec!["events.>".to_string()],
/// allow_direct: true,
/// ..Default::default()
/// })
/// .await?;
///
/// jetstream.publish("events.data", "data".into()).await?;
/// let pub_ack = jetstream.publish("events.data", "data".into()).await?;
///
/// let message = stream
/// .direct_get_next_for_subject("events.data", Some(pub_ack.await?.sequence))
/// .await?;
///
/// # Ok(())
/// # }
/// ```
pub async fn direct_get_next_for_subject<T: AsRef<str>>(
&self,
subject: T,
sequence: Option<u64>,
) -> Result<Message, DirectGetError> {
if !is_valid_subject(&subject) {
return Err(DirectGetError::new(DirectGetErrorKind::InvalidSubject));
}
let request_subject = format!("{}.DIRECT.GET.{}", &self.context.prefix, &self.name);
let payload;
if let Some(sequence) = sequence {
payload = json!({
"seq": sequence,
"next_by_subj": subject.as_ref(),
});
} else {
payload = json!({
"next_by_subj": subject.as_ref(),
});
}
let response = self
.context
.client
.request(
request_subject,
serde_json::to_vec(&payload).map(Bytes::from)?,
)
.await
.map(|message| Message {
message,
context: self.context.clone(),
})?;
if let Some(status) = response.status {
if let Some(ref description) = response.description {
match status {
StatusCode::NOT_FOUND => {
return Err(DirectGetError::new(DirectGetErrorKind::NotFound))
}
// 408 is used in Direct Message for bad/empty payload.
StatusCode::TIMEOUT => {
return Err(DirectGetError::new(DirectGetErrorKind::InvalidSubject))
}
_ => {
return Err(DirectGetError::new(DirectGetErrorKind::ErrorResponse(
status,
description.to_string(),
)));
}
}
}
}
Ok(response)
}
/// Gets first message from [Stream].
///
/// Requires a [Stream] with `allow_direct` set to `true`.
/// This is different from [Stream::get_raw_message], as it can fetch [Message]
/// from any replica member. This means read after write is possible,
/// as that given replica might not yet catch up with the leader.
///
/// # Examples
///
/// ```no_run
/// # #[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
/// .create_stream(async_nats::jetstream::stream::Config {
/// name: "events".to_string(),
/// subjects: vec!["events.>".to_string()],
/// allow_direct: true,
/// ..Default::default()
/// })
/// .await?;
///
/// let pub_ack = jetstream.publish("events.data", "data".into()).await?;
///
/// let message = stream.direct_get_first_for_subject("events.data").await?;
///
/// # Ok(())
/// # }
/// ```
pub async fn direct_get_first_for_subject<T: AsRef<str>>(
&self,
subject: T,
) -> Result<Message, DirectGetError> {
if !is_valid_subject(&subject) {
return Err(DirectGetError::new(DirectGetErrorKind::InvalidSubject));
}
let request_subject = format!("{}.DIRECT.GET.{}", &self.context.prefix, &self.name);
let payload = json!({
"next_by_subj": subject.as_ref(),
});
let response = self
.context
.client
.request(
request_subject,
serde_json::to_vec(&payload).map(Bytes::from)?,
)
.await
.map(|message| Message {
message,
context: self.context.clone(),
})?;
if let Some(status) = response.status {
if let Some(ref description) = response.description {
match status {
StatusCode::NOT_FOUND => {
return Err(DirectGetError::new(DirectGetErrorKind::NotFound))
}
// 408 is used in Direct Message for bad/empty payload.
StatusCode::TIMEOUT => {
return Err(DirectGetError::new(DirectGetErrorKind::InvalidSubject))
}
_ => {
return Err(DirectGetError::new(DirectGetErrorKind::ErrorResponse(
status,
description.to_string(),
)));
}
}
}
}
Ok(response)
}
/// Gets message from [Stream] with given `sequence id`.
///
/// Requires a [Stream] with `allow_direct` set to `true`.
/// This is different from [Stream::get_raw_message], as it can fetch [Message]
/// from any replica member. This means read after write is possible,
/// as that given replica might not yet catch up with the leader.
///
/// # Examples
///
/// ```no_run
/// # #[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
/// .create_stream(async_nats::jetstream::stream::Config {
/// name: "events".to_string(),
/// subjects: vec!["events.>".to_string()],
/// allow_direct: true,
/// ..Default::default()
/// })
/// .await?;
///
/// let pub_ack = jetstream.publish("events.data", "data".into()).await?;
///
/// let message = stream.direct_get(pub_ack.await?.sequence).await?;
///
/// # Ok(())
/// # }
/// ```
pub async fn direct_get(&self, sequence: u64) -> Result<StreamMessage, DirectGetError> {
let subject = format!("{}.DIRECT.GET.{}", &self.context.prefix, &self.name);
let payload = json!({
"seq": sequence,
});
let response = self
.context
.client
.request(subject, serde_json::to_vec(&payload).map(Bytes::from)?)
.await?;
if let Some(status) = response.status {
if let Some(ref description) = response.description {
match status {
StatusCode::NOT_FOUND => {
return Err(DirectGetError::new(DirectGetErrorKind::NotFound))
}
// 408 is used in Direct Message for bad/empty payload.
StatusCode::TIMEOUT => {
return Err(DirectGetError::new(DirectGetErrorKind::InvalidSubject))
}
_ => {
return Err(DirectGetError::new(DirectGetErrorKind::ErrorResponse(
status,
description.to_string(),
)));
}
}
}
}
StreamMessage::try_from(response).map_err(Into::into)
}
/// Gets last message for a given `subject`.
///
/// Requires a [Stream] with `allow_direct` set to `true`.
/// This is different from [Stream::get_raw_message], as it can fetch [Message]
/// from any replica member. This means read after write is possible,
/// as that given replica might not yet catch up with the leader.
///
/// # Examples
///
/// ```no_run
/// # #[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
/// .create_stream(async_nats::jetstream::stream::Config {
/// name: "events".to_string(),
/// subjects: vec!["events.>".to_string()],
/// allow_direct: true,
/// ..Default::default()
/// })
/// .await?;
///
/// jetstream.publish("events.data", "data".into()).await?;
///
/// let message = stream.direct_get_last_for_subject("events.data").await?;
///
/// # Ok(())
/// # }
/// ```
pub async fn direct_get_last_for_subject<T: AsRef<str>>(
&self,
subject: T,
) -> Result<StreamMessage, DirectGetError> {
let subject = format!(
"{}.DIRECT.GET.{}.{}",
&self.context.prefix,
&self.name,
subject.as_ref()
);
let response = self.context.client.request(subject, "".into()).await?;
if let Some(status) = response.status {
if let Some(ref description) = response.description {
match status {
StatusCode::NOT_FOUND => {
return Err(DirectGetError::new(DirectGetErrorKind::NotFound))
}
// 408 is used in Direct Message for bad/empty payload.
StatusCode::TIMEOUT => {
return Err(DirectGetError::new(DirectGetErrorKind::InvalidSubject))
}
_ => {
return Err(DirectGetError::new(DirectGetErrorKind::ErrorResponse(
status,
description.to_string(),
)));
}
}
}
}
StreamMessage::try_from(response).map_err(Into::into)
}
/// Get a raw message from the stream.
///
/// # Examples
///
/// ```no_run
/// #[tokio::main]
/// # async fn mains() -> Result<(), async_nats::Error> {
/// 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", "data".into()).await?;
/// let raw_message = stream.get_raw_message(publish_ack.await?.sequence).await?;
/// println!("Retrieved raw message {:?}", raw_message);
/// # Ok(())
/// # }
/// ```
pub async fn get_raw_message(&self, sequence: u64) -> Result<StreamMessage, RawMessageError> {
let subject = format!("STREAM.MSG.GET.{}", &self.name);
let payload = json!({
"seq": sequence,
});
let response: Response<GetRawMessage> = self
.context
.request(subject, &payload)
.map_err(|err| LastRawMessageError::with_source(LastRawMessageErrorKind::Other, err))
.await?;
match response {
Response::Err { error } => {
if error.error_code() == ErrorCode::NO_MESSAGE_FOUND {
Err(LastRawMessageError::new(
LastRawMessageErrorKind::NoMessageFound,
))
} else {
Err(LastRawMessageError::new(
LastRawMessageErrorKind::JetStream(error),
))
}
}
Response::Ok(value) => StreamMessage::try_from(value.message)
.map_err(|err| RawMessageError::with_source(RawMessageErrorKind::Other, err)),
}
}
/// Get the last raw message from the stream by subject.
///
/// # Examples
///
/// ```no_run
/// #[tokio::main]
/// # async fn mains() -> Result<(), async_nats::Error> {
/// 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", "data".into()).await?;
/// let raw_message = stream.get_last_raw_message_by_subject("events").await?;
/// println!("Retrieved raw message {:?}", raw_message);
/// # Ok(())
/// # }
/// ```
pub async fn get_last_raw_message_by_subject(
&self,
stream_subject: &str,
) -> Result<StreamMessage, LastRawMessageError> {
let subject = format!("STREAM.MSG.GET.{}", &self.name);
let payload = json!({
"last_by_subj": stream_subject,
});
let response: Response<GetRawMessage> = self
.context
.request(subject, &payload)
.map_err(|err| LastRawMessageError::with_source(LastRawMessageErrorKind::Other, err))
.await?;
match response {
Response::Err { error } => {
if error.error_code() == ErrorCode::NO_MESSAGE_FOUND {
Err(LastRawMessageError::new(
LastRawMessageErrorKind::NoMessageFound,
))
} else {
Err(LastRawMessageError::new(
LastRawMessageErrorKind::JetStream(error),
))
}
}
Response::Ok(value) => Ok(value.message.try_into().map_err(|err| {
LastRawMessageError::with_source(LastRawMessageErrorKind::Other, err)
})?),
}
}
/// Delete a message from the stream.
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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", "data".into()).await?;
/// stream.delete_message(publish_ack.await?.sequence).await?;
/// # Ok(())
/// # }
/// ```
pub async fn delete_message(&self, sequence: u64) -> Result<bool, DeleteMessageError> {
let subject = format!("STREAM.MSG.DELETE.{}", &self.name);
let payload = json!({
"seq": sequence,
});
let response: Response<DeleteStatus> = self
.context
.request(subject, &payload)
.map_err(|err| match err.kind() {
RequestErrorKind::TimedOut => {
DeleteMessageError::new(DeleteMessageErrorKind::TimedOut)
}
_ => DeleteMessageError::with_source(DeleteMessageErrorKind::Request, err),
})
.await?;
match response {
Response::Err { error } => Err(DeleteMessageError::new(
DeleteMessageErrorKind::JetStream(error),
)),
Response::Ok(value) => Ok(value.success),
}
}
/// Purge `Stream` messages.
///
/// # Examples
///
/// ```no_run
/// # #[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 fn purge(&self) -> Purge<No, No> {
Purge::build(self)
}
/// Purge `Stream` messages for a matching subject.
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # #[allow(deprecated)]
/// # 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(())
/// # }
/// ```
#[deprecated(
since = "0.25.0",
note = "Overloads have been replaced with an into_future based builder. Use Stream::purge().filter(subject) instead."
)]
pub async fn purge_subject<T>(&self, subject: T) -> Result<PurgeResponse, PurgeError>
where
T: Into<String>,
{
self.purge().filter(subject).await
}
/// Create or update `Durable` or `Ephemeral` Consumer (if `durable_name` was not provided) and
/// returns the info from the server about created [Consumer]
/// If you want a strict update or create, use [Stream::create_consumer_strict] or [Stream::update_consumer].
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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?;
/// # Ok(())
/// # }
/// ```
pub async fn create_consumer<C: IntoConsumerConfig + FromConsumer>(
&self,
config: C,
) -> Result<Consumer<C>, ConsumerError> {
self.context
.create_consumer_on_stream(config, self.name.clone())
.await
}
/// Update an existing consumer.
/// This call will fail if the consumer does not exist.
/// returns the info from the server about updated [Consumer].
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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
/// .update_consumer(consumer::pull::Config {
/// durable_name: Some("pull".to_string()),
/// ..Default::default()
/// })
/// .await?;
/// # Ok(())
/// # }
/// ```
#[cfg(feature = "server_2_10")]
pub async fn update_consumer<C: IntoConsumerConfig + FromConsumer>(
&self,
config: C,
) -> Result<Consumer<C>, ConsumerUpdateError> {
self.context
.update_consumer_on_stream(config, self.name.clone())
.await
}
/// Create consumer, but only if it does not exist or the existing config is exactly
/// the same.
/// This method will fail if consumer is already present with different config.
/// returns the info from the server about created [Consumer].
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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_strict(consumer::pull::Config {
/// durable_name: Some("pull".to_string()),
/// ..Default::default()
/// })
/// .await?;
/// # Ok(())
/// # }
/// ```
#[cfg(feature = "server_2_10")]
pub async fn create_consumer_strict<C: IntoConsumerConfig + FromConsumer>(
&self,
config: C,
) -> Result<Consumer<C>, ConsumerCreateStrictError> {
self.context
.create_consumer_strict_on_stream(config, self.name.clone())
.await
}
/// Retrieve [Info] about [Consumer] from the server.
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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?;
/// # Ok(())
/// # }
/// ```
pub async fn consumer_info<T: AsRef<str>>(
&self,
name: T,
) -> Result<consumer::Info, crate::Error> {
let name = name.as_ref();
let subject = format!("CONSUMER.INFO.{}.{}", self.name, name);
match self.context.request(subject, &json!({})).await? {
Response::Ok(info) => Ok(info),
Response::Err { error } => Err(Box::new(std::io::Error::new(
ErrorKind::Other,
format!("nats: error while getting consumer info: {}", error),
))),
}
}
/// Get [Consumer] from the the server. [Consumer] iterators can be used to retrieve
/// [Messages][crate::jetstream::Message] for a given [Consumer].
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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?;
/// # Ok(())
/// # }
/// ```
pub async fn get_consumer<T: FromConsumer + IntoConsumerConfig>(
&self,
name: &str,
) -> Result<Consumer<T>, crate::Error> {
let info = self.consumer_info(name).await?;
Ok(Consumer::new(
T::try_from_consumer_config(info.config.clone())?,
info,
self.context.clone(),
))
}
/// 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
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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?;
/// # Ok(())
/// # }
/// ```
pub async fn get_or_create_consumer<T: FromConsumer + IntoConsumerConfig>(
&self,
name: &str,
config: T,
) -> Result<Consumer<T>, ConsumerError> {
let subject = format!("CONSUMER.INFO.{}.{}", self.name, name);
match self.context.request(subject, &json!({})).await? {
Response::Err { error } if error.code() == 404 => self.create_consumer(config).await,
Response::Err { error } => Err(error.into()),
Response::Ok::<consumer::Info>(info) => Ok(Consumer::new(
T::try_from_consumer_config(info.config.clone()).map_err(|err| {
ConsumerError::with_source(ConsumerErrorKind::InvalidConsumerType, err)
})?,
info,
self.context.clone(),
)),
}
}
/// Delete a [Consumer] from the server.
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// 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?;
/// # Ok(())
/// # }
/// ```
pub async fn delete_consumer(&self, name: &str) -> Result<DeleteStatus, ConsumerError> {
let subject = format!("CONSUMER.DELETE.{}.{}", self.name, name);
match self.context.request(subject, &json!({})).await? {
Response::Ok(delete_status) => Ok(delete_status),
Response::Err { error } => Err(error.into()),
}
}
/// Lists names of all consumers for current stream.
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// use futures::TryStreamExt;
/// let client = async_nats::connect("demo.nats.io:4222").await?;
/// let jetstream = async_nats::jetstream::new(client);
/// let stream = jetstream.get_stream("stream").await?;
/// let mut names = stream.consumer_names();
/// while let Some(consumer) = names.try_next().await? {
/// println!("consumer: {stream:?}");
/// }
/// # Ok(())
/// # }
/// ```
pub fn consumer_names(&self) -> ConsumerNames {
ConsumerNames {
context: self.context.clone(),
stream: self.name.clone(),
offset: 0,
page_request: None,
consumers: Vec::new(),
done: false,
}
}
/// Lists all consumers info for current stream.
///
/// # Examples
///
/// ```no_run
/// # #[tokio::main]
/// # async fn main() -> Result<(), async_nats::Error> {
/// use futures::TryStreamExt;
/// let client = async_nats::connect("demo.nats.io:4222").await?;
/// let jetstream = async_nats::jetstream::new(client);
/// let stream = jetstream.get_stream("stream").await?;
/// let mut consumers = stream.consumers();
/// while let Some(consumer) = consumers.try_next().await? {
/// println!("consumer: {consumer:?}");
/// }
/// # Ok(())
/// # }
/// ```
pub fn consumers(&self) -> Consumers {
Consumers {
context: self.context.clone(),
stream: self.name.clone(),
offset: 0,
page_request: None,
consumers: Vec::new(),
done: false,
}
}
}
/// `StreamConfig` determines the properties for a stream.
/// There are sensible defaults for most. If no subjects are
/// given the name will be used as the only subject.
#[derive(Debug, Default, Serialize, Deserialize, Clone, PartialEq, Eq)]
pub struct Config {
/// A name for the Stream. Must not have spaces, tabs or period `.` characters
pub name: String,
/// How large the Stream may become in total bytes before the configured discard policy kicks in
pub max_bytes: i64,
/// How large the Stream may become in total messages before the configured discard policy kicks in
#[serde(rename = "max_msgs")]
pub max_messages: i64,
/// Maximum amount of messages to keep per subject
#[serde(rename = "max_msgs_per_subject")]
pub max_messages_per_subject: i64,
/// When a Stream has reached its configured `max_bytes` or `max_msgs`, this policy kicks in.
/// `DiscardPolicy::New` refuses new messages or `DiscardPolicy::Old` (default) deletes old messages to make space
pub discard: DiscardPolicy,
/// Prevents a message from being added to a stream if the max_msgs_per_subject limit for the subject has been reached
#[serde(default, skip_serializing_if = "is_default")]
pub discard_new_per_subject: bool,
/// Which NATS subjects to populate this stream with. Supports wildcards. Defaults to just the
/// configured stream `name`.
#[serde(default, skip_serializing_if = "Vec::is_empty")]
pub subjects: Vec<String>,
/// How message retention is considered, `Limits` (default), `Interest` or `WorkQueue`
pub retention: RetentionPolicy,
/// How many Consumers can be defined for a given Stream, -1 for unlimited
pub max_consumers: i32,
/// Maximum age of any message in the stream, expressed in nanoseconds
#[serde(with = "serde_nanos")]
pub max_age: Duration,
/// The largest message that will be accepted by the Stream
#[serde(default, skip_serializing_if = "is_default", rename = "max_msg_size")]
pub max_message_size: i32,
/// The type of storage backend, `File` (default) and `Memory`
pub storage: StorageType,
/// How many replicas to keep for each message in a clustered JetStream, maximum 5
pub num_replicas: usize,
/// Disables acknowledging messages that are received by the Stream
#[serde(default, skip_serializing_if = "is_default")]
pub no_ack: bool,
/// The window within which to track duplicate messages.
#[serde(default, skip_serializing_if = "is_default", with = "serde_nanos")]
pub duplicate_window: Duration,
/// The owner of the template associated with this stream.
#[serde(default, skip_serializing_if = "is_default")]
pub template_owner: String,
/// Indicates the stream is sealed and cannot be modified in any way
#[serde(default, skip_serializing_if = "is_default")]
pub sealed: bool,
/// A short description of the purpose of this stream.
#[serde(default, skip_serializing_if = "is_default")]
pub description: Option<String>,
#[serde(
default,
rename = "allow_rollup_hdrs",
skip_serializing_if = "is_default"
)]
/// Indicates if rollups will be allowed or not.
pub allow_rollup: bool,
#[serde(default, skip_serializing_if = "is_default")]
/// Indicates deletes will be denied or not.
pub deny_delete: bool,
/// Indicates if purges will be denied or not.
#[serde(default, skip_serializing_if = "is_default")]
pub deny_purge: bool,
/// Optional republish config.
#[serde(default, skip_serializing_if = "is_default")]
pub republish: Option<Republish>,
/// Enables direct get, which would get messages from
/// non-leader.
#[serde(default, skip_serializing_if = "is_default")]
pub allow_direct: bool,
/// Enable direct access also for mirrors.
#[serde(default, skip_serializing_if = "is_default")]
pub mirror_direct: bool,
/// Stream mirror configuration.
#[serde(default, skip_serializing_if = "Option::is_none")]
pub mirror: Option<Source>,
/// Sources configuration.
#[serde(default, skip_serializing_if = "Option::is_none")]
pub sources: Option<Vec<Source>>,
#[cfg(feature = "server_2_10")]
/// Additional stream metadata.
#[serde(default, skip_serializing_if = "is_default")]
pub metadata: HashMap<String, String>,
#[cfg(feature = "server_2_10")]
/// Allow applying a subject transform to incoming messages
#[serde(default, skip_serializing_if = "Option::is_none")]
pub subject_transform: Option<SubjectTransform>,
#[cfg(feature = "server_2_10")]
/// Override compression config for this stream.
/// Wrapping enum that has `None` type with [Option] is there
/// because [Stream] can override global compression set to [Compression::S2]
/// to [Compression::None], which is different from not overriding global config with anything.
#[serde(default, skip_serializing_if = "Option::is_none")]
pub compression: Option<Compression>,
#[cfg(feature = "server_2_10")]
/// Set limits on consumers that are created on this stream.
#[serde(default, deserialize_with = "default_consumer_limits_as_none")]
pub consumer_limits: Option<ConsumerLimits>,
#[cfg(feature = "server_2_10")]
/// Sets the first sequence for the stream.
#[serde(default, skip_serializing_if = "Option::is_none", rename = "first_seq")]
pub first_sequence: Option<u64>,
/// Placement configuration for clusters and tags.
#[serde(default, skip_serializing_if = "Option::is_none")]
pub placement: Option<Placement>,
}
impl From<&Config> for Config {
fn from(sc: &Config) -> Config {
sc.clone()
}
}
impl From<&str> for Config {
fn from(s: &str) -> Config {
Config {
name: s.to_string(),
..Default::default()
}
}
}
#[cfg(feature = "server_2_10")]
fn default_consumer_limits_as_none<'de, D>(
deserializer: D,
) -> Result<Option<ConsumerLimits>, D::Error>
where
D: Deserializer<'de>,
{
let consumer_limits = Option::<ConsumerLimits>::deserialize(deserializer)?;
if let Some(cl) = consumer_limits {
if cl == ConsumerLimits::default() {
Ok(None)
} else {
Ok(Some(cl))
}
} else {
Ok(None)
}
}
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, Default)]
pub struct ConsumerLimits {
/// Sets the maximum [crate::jetstream::consumer::Config::inactive_threshold] that can be set on the consumer.
#[serde(default, with = "serde_nanos")]
pub inactive_threshold: std::time::Duration,
/// Sets the maximum [crate::jetstream::consumer::Config::max_ack_pending] that can be set on the consumer.
#[serde(default)]
pub max_ack_pending: i64,
}
#[derive(Serialize, Deserialize, Debug, Clone, Eq, PartialEq)]
pub enum Compression {
#[serde(rename = "s2")]
S2,
#[serde(rename = "none")]
None,
}
// SubjectTransform is for applying a subject transform (to matching messages) when a new message is received
#[derive(Serialize, Deserialize, Debug, Clone, Eq, PartialEq)]
pub struct SubjectTransform {
#[serde(rename = "src")]
pub source: String,
#[serde(rename = "dest")]
pub destination: String,
}
// Republish is for republishing messages once committed to a stream.
#[derive(Serialize, Deserialize, Debug, Clone, Eq, PartialEq)]
pub struct Republish {
/// Subject that should be republished.
#[serde(rename = "src")]
pub source: String,
/// Subject where messages will be republished.
#[serde(rename = "dest")]
pub destination: String,
/// If true, only headers should be republished.
#[serde(default)]
pub headers_only: bool,
}
/// Placement describes on which cluster or tags the stream should be placed.
#[derive(Debug, Clone, Default, Serialize, Deserialize, PartialEq, Eq)]
pub struct Placement {
// Cluster where the stream should be placed.
#[serde(default, skip_serializing_if = "is_default")]
pub cluster: Option<String>,
// Matching tags for stream placement.
#[serde(default, skip_serializing_if = "is_default")]
pub tags: Vec<String>,
}
/// `DiscardPolicy` determines how we proceed when limits of messages or bytes are hit. The default, `Old` will
/// remove older messages. `New` will fail to store the new message.
#[derive(Default, Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
#[repr(u8)]
pub enum DiscardPolicy {
/// will remove older messages when limits are hit.
#[default]
#[serde(rename = "old")]
Old = 0,
/// will error on a StoreMsg call when limits are hit
#[serde(rename = "new")]
New = 1,
}
/// `RetentionPolicy` determines how messages in a set are retained.
#[derive(Default, Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
#[repr(u8)]
pub enum RetentionPolicy {
/// `Limits` (default) means that messages are retained until any given limit is reached.
/// This could be one of messages, bytes, or age.
#[default]
#[serde(rename = "limits")]
Limits = 0,
/// `Interest` specifies that when all known observables have acknowledged a message it can be removed.
#[serde(rename = "interest")]
Interest = 1,
/// `WorkQueue` specifies that when the first worker or subscriber acknowledges the message it can be removed.
#[serde(rename = "workqueue")]
WorkQueue = 2,
}
/// determines how messages are stored for retention.
#[derive(Default, Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)]
#[repr(u8)]
pub enum StorageType {
/// Stream data is kept in files. This is the default.
#[default]
#[serde(rename = "file")]
File = 0,
/// Stream data is kept only in memory.
#[serde(rename = "memory")]
Memory = 1,
}
/// Shows config and current state for this stream.
#[derive(Debug, Deserialize, Clone, PartialEq, Eq)]
pub struct Info {
/// The configuration associated with this stream.
pub config: Config,
/// The time that this stream was created.
#[serde(with = "rfc3339")]
pub created: time::OffsetDateTime,
/// Various metrics associated with this stream.
pub state: State,
/// Information about leader and replicas.
pub cluster: Option<ClusterInfo>,
/// Information about mirror config if present.
#[serde(default)]
pub mirror: Option<SourceInfo>,
/// Information about sources configs if present.
#[serde(default)]
pub sources: Vec<SourceInfo>,
}
#[derive(Deserialize)]
pub struct DeleteStatus {
pub success: bool,
}
/// information about the given stream.
#[derive(Debug, Deserialize, Clone, Copy, PartialEq, Eq)]
pub struct State {
/// The number of messages contained in this stream
pub messages: u64,
/// The number of bytes of all messages contained in this stream
pub bytes: u64,
/// The lowest sequence number still present in this stream
#[serde(rename = "first_seq")]
pub first_sequence: u64,
/// The time associated with the oldest message still present in this stream
#[serde(with = "rfc3339", rename = "first_ts")]
pub first_timestamp: time::OffsetDateTime,
/// The last sequence number assigned to a message in this stream
#[serde(rename = "last_seq")]
pub last_sequence: u64,
/// The time that the last message was received by this stream
#[serde(with = "rfc3339", rename = "last_ts")]
pub last_timestamp: time::OffsetDateTime,
/// The number of consumers configured to consume this stream
pub consumer_count: usize,
}
/// A raw stream message in the representation it is stored.
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct RawMessage {
/// Subject of the message.
#[serde(rename = "subject")]
pub subject: String,
/// Sequence of the message.
#[serde(rename = "seq")]
pub sequence: u64,
/// Raw payload of the message as a base64 encoded string.
#[serde(default, rename = "data")]
pub payload: String,
/// Raw header string, if any.
#[serde(default, rename = "hdrs")]
pub headers: Option<String>,
/// The time the message was published.
#[serde(rename = "time", with = "rfc3339")]
pub time: time::OffsetDateTime,
}
impl TryFrom<RawMessage> for StreamMessage {
type Error = crate::Error;
fn try_from(value: RawMessage) -> Result<Self, Self::Error> {
let decoded_payload = STANDARD
.decode(value.payload)
.map_err(|err| Box::new(std::io::Error::new(ErrorKind::Other, err)))?;
let decoded_headers = value
.headers
.map(|header| STANDARD.decode(header))
.map_or(Ok(None), |v| v.map(Some))?;
let (headers, _, _) = decoded_headers
.map_or_else(|| Ok((HeaderMap::new(), None, None)), |h| parse_headers(&h))?;
Ok(StreamMessage {
subject: value.subject.into(),
payload: decoded_payload.into(),
headers,
sequence: value.sequence,
time: value.time,
})
}
}
fn is_continuation(c: char) -> bool {
c == ' ' || c == '\t'
}
const HEADER_LINE: &str = "NATS/1.0";
#[allow(clippy::type_complexity)]
fn parse_headers(
buf: &[u8],
) -> Result<(HeaderMap, Option<StatusCode>, Option<String>), crate::Error> {
let mut headers = HeaderMap::new();
let mut maybe_status: Option<StatusCode> = None;
let mut maybe_description: Option<String> = None;
let mut lines = if let Ok(line) = std::str::from_utf8(buf) {
line.lines().peekable()
} else {
return Err(Box::new(std::io::Error::new(
ErrorKind::Other,
"invalid header",
)));
};
if let Some(line) = lines.next() {
let line = line
.strip_prefix(HEADER_LINE)
.ok_or_else(|| {
Box::new(std::io::Error::new(
ErrorKind::Other,
"version line does not start with NATS/1.0",
))
})?
.trim();
match line.split_once(' ') {
Some((status, description)) => {
if !status.is_empty() {
maybe_status = Some(status.parse()?);
}
if !description.is_empty() {
maybe_description = Some(description.trim().to_string());
}
}
None => {
if !line.is_empty() {
maybe_status = Some(line.parse()?);
}
}
}
} else {
return Err(Box::new(std::io::Error::new(
ErrorKind::Other,
"expected header information not found",
)));
};
while let Some(line) = lines.next() {
if line.is_empty() {
continue;
}
if let Some((k, v)) = line.split_once(':').to_owned() {
let mut s = String::from(v.trim());
while let Some(v) = lines.next_if(|s| s.starts_with(is_continuation)).to_owned() {
s.push(' ');
s.push_str(v.trim());
}
headers.insert(
HeaderName::from_str(k)?,
HeaderValue::from_str(&s)
.map_err(|err| Box::new(io::Error::new(ErrorKind::Other, err)))?,
);
} else {
return Err(Box::new(std::io::Error::new(
ErrorKind::Other,
"malformed header line",
)));
}
}
if headers.is_empty() {
Ok((HeaderMap::new(), maybe_status, maybe_description))
} else {
Ok((headers, maybe_status, maybe_description))
}
}
#[derive(Debug, Serialize, Deserialize, Clone)]
struct GetRawMessage {
pub(crate) message: RawMessage,
}
fn is_default<T: Default + Eq>(t: &T) -> bool {
t == &T::default()
}
/// Information about the stream's, consumer's associated `JetStream` cluster
#[derive(Debug, Default, Deserialize, Clone, PartialEq, Eq)]
pub struct ClusterInfo {
/// The cluster name.
pub name: Option<String>,
/// The server name of the RAFT leader.
pub leader: Option<String>,
/// The members of the RAFT cluster.
#[serde(default)]
pub replicas: Vec<PeerInfo>,
}
/// The members of the RAFT cluster
#[derive(Debug, Default, Deserialize, Clone, PartialEq, Eq)]
pub struct PeerInfo {
/// The server name of the peer.
pub name: String,
/// Indicates if the server is up to date and synchronized.
pub current: bool,
/// Nanoseconds since this peer was last seen.
#[serde(with = "serde_nanos")]
pub active: Duration,
/// Indicates the node is considered offline by the group.
#[serde(default)]
pub offline: bool,
/// How many uncommitted operations this peer is behind the leader.
pub lag: Option<u64>,
}
#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
pub struct SourceInfo {
/// Source name.
pub name: String,
/// Number of messages this source is lagging behind.
pub lag: u64,
/// Last time the source was seen active.
#[serde(deserialize_with = "negative_duration_as_none")]
pub active: Option<std::time::Duration>,
/// Filtering for the source.
#[serde(default)]
pub filter_subject: Option<String>,
/// Source destination subject.
#[serde(default)]
pub subject_transform_dest: Option<String>,
/// List of transforms.
#[serde(default)]
pub subject_transforms: Vec<SubjectTransform>,
}
fn negative_duration_as_none<'de, D>(
deserializer: D,
) -> Result<Option<std::time::Duration>, D::Error>
where
D: Deserializer<'de>,
{
let n = i64::deserialize(deserializer)?;
if n.is_negative() {
Ok(None)
} else {
Ok(Some(std::time::Duration::from_nanos(n as u64)))
}
}
/// The response generated by trying to purge a stream.
#[derive(Debug, Deserialize, Clone, Copy)]
pub struct PurgeResponse {
/// Whether the purge request was successful.
pub success: bool,
/// The number of purged messages in a stream.
pub purged: u64,
}
/// The payload used to generate a purge request.
#[derive(Default, Debug, Serialize, Clone)]
pub struct PurgeRequest {
/// Purge up to but not including sequence.
#[serde(default, rename = "seq", skip_serializing_if = "is_default")]
pub sequence: Option<u64>,
/// Subject to match against messages for the purge command.
#[serde(default, skip_serializing_if = "is_default")]
pub filter: Option<String>,
/// Number of messages to keep.
#[serde(default, skip_serializing_if = "is_default")]
pub keep: Option<u64>,
}
#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Default)]
pub struct Source {
/// Name of the stream source.
pub name: String,
/// Optional source start sequence.
#[serde(default, rename = "opt_start_seq", skip_serializing_if = "is_default")]
pub start_sequence: Option<u64>,
#[serde(
default,
rename = "opt_start_time",
skip_serializing_if = "is_default",
with = "rfc3339::option"
)]
/// Optional source start time.
pub start_time: Option<OffsetDateTime>,
/// Optional additional filter subject.
#[serde(default, skip_serializing_if = "is_default")]
pub filter_subject: Option<String>,
/// Optional config for sourcing streams from another prefix, used for cross-account.
#[serde(default, skip_serializing_if = "Option::is_none")]
pub external: Option<External>,
/// Optional config to set a domain, if source is residing in different one.
#[serde(default, skip_serializing_if = "is_default")]
pub domain: Option<String>,
/// Subject transforms for Stream.
#[cfg(feature = "server_2_10")]
#[serde(default, skip_serializing_if = "is_default")]
pub subject_transforms: Vec<SubjectTransform>,
}
#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Default)]
pub struct External {
/// Api prefix of external source.
#[serde(rename = "api")]
pub api_prefix: String,
/// Optional configuration of delivery prefix.
#[serde(rename = "deliver", skip_serializing_if = "is_default")]
pub delivery_prefix: Option<String>,
}
use std::marker::PhantomData;
#[derive(Debug, Default)]
pub struct Yes;
#[derive(Debug, Default)]
pub struct No;
pub trait ToAssign: Debug {}
impl ToAssign for Yes {}
impl ToAssign for No {}
#[derive(Debug)]
pub struct Purge<SEQUENCE, KEEP>
where
SEQUENCE: ToAssign,
KEEP: ToAssign,
{
inner: PurgeRequest,
sequence_set: PhantomData<SEQUENCE>,
keep_set: PhantomData<KEEP>,
context: Context,
stream_name: String,
}
impl<SEQUENCE, KEEP> Purge<SEQUENCE, KEEP>
where
SEQUENCE: ToAssign,
KEEP: ToAssign,
{
/// Adds subject filter to [PurgeRequest]
pub fn filter<T: Into<String>>(mut self, filter: T) -> Purge<SEQUENCE, KEEP> {
self.inner.filter = Some(filter.into());
self
}
}
impl Purge<No, No> {
pub(crate) fn build<I>(stream: &Stream<I>) -> Purge<No, No> {
Purge {
context: stream.context.clone(),
stream_name: stream.name.clone(),
inner: Default::default(),
sequence_set: PhantomData {},
keep_set: PhantomData {},
}
}
}
impl<KEEP> Purge<No, KEEP>
where
KEEP: ToAssign,
{
/// Creates a new [PurgeRequest].
/// `keep` and `sequence` are exclusive, enforced compile time by generics.
pub fn keep(self, keep: u64) -> Purge<No, Yes> {
Purge {
context: self.context.clone(),
stream_name: self.stream_name.clone(),
sequence_set: PhantomData {},
keep_set: PhantomData {},
inner: PurgeRequest {
keep: Some(keep),
..self.inner
},
}
}
}
impl<SEQUENCE> Purge<SEQUENCE, No>
where
SEQUENCE: ToAssign,
{
/// Creates a new [PurgeRequest].
/// `keep` and `sequence` are exclusive, enforces compile time by generics.
pub fn sequence(self, sequence: u64) -> Purge<Yes, No> {
Purge {
context: self.context.clone(),
stream_name: self.stream_name.clone(),
sequence_set: PhantomData {},
keep_set: PhantomData {},
inner: PurgeRequest {
sequence: Some(sequence),
..self.inner
},
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub enum PurgeErrorKind {
Request,
TimedOut,
JetStream(super::errors::Error),
}
impl Display for PurgeErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Request => write!(f, "request failed"),
Self::TimedOut => write!(f, "timed out"),
Self::JetStream(err) => write!(f, "JetStream error: {}", err),
}
}
}
pub type PurgeError = Error<PurgeErrorKind>;
impl<S, K> IntoFuture for Purge<S, K>
where
S: ToAssign + std::marker::Send,
K: ToAssign + std::marker::Send,
{
type Output = Result<PurgeResponse, PurgeError>;
type IntoFuture = BoxFuture<'static, Result<PurgeResponse, PurgeError>>;
fn into_future(self) -> Self::IntoFuture {
Box::pin(std::future::IntoFuture::into_future(async move {
let request_subject = format!("STREAM.PURGE.{}", self.stream_name);
let response: Response<PurgeResponse> = self
.context
.request(request_subject, &self.inner)
.map_err(|err| match err.kind() {
RequestErrorKind::TimedOut => PurgeError::new(PurgeErrorKind::TimedOut),
_ => PurgeError::with_source(PurgeErrorKind::Request, err),
})
.await?;
match response {
Response::Err { error } => Err(PurgeError::new(PurgeErrorKind::JetStream(error))),
Response::Ok(response) => Ok(response),
}
}))
}
}
#[derive(Deserialize, Debug)]
struct ConsumerPage {
total: usize,
consumers: Option<Vec<String>>,
}
#[derive(Deserialize, Debug)]
struct ConsumerInfoPage {
total: usize,
consumers: Option<Vec<super::consumer::Info>>,
}
type ConsumerNamesErrorKind = StreamsErrorKind;
type ConsumerNamesError = StreamsError;
type PageRequest = BoxFuture<'static, Result<ConsumerPage, RequestError>>;
pub struct ConsumerNames {
context: Context,
stream: String,
offset: usize,
page_request: Option<PageRequest>,
consumers: Vec<String>,
done: bool,
}
impl futures::Stream for ConsumerNames {
type Item = Result<String, ConsumerNamesError>;
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
match self.page_request.as_mut() {
Some(page) => match page.try_poll_unpin(cx) {
std::task::Poll::Ready(page) => {
self.page_request = None;
let page = page.map_err(|err| {
ConsumerNamesError::with_source(ConsumerNamesErrorKind::Other, err)
})?;
if let Some(consumers) = page.consumers {
self.offset += consumers.len();
self.consumers = consumers;
if self.offset >= page.total {
self.done = true;
}
match self.consumers.pop() {
Some(stream) => Poll::Ready(Some(Ok(stream))),
None => Poll::Ready(None),
}
} else {
Poll::Ready(None)
}
}
std::task::Poll::Pending => std::task::Poll::Pending,
},
None => {
if let Some(stream) = self.consumers.pop() {
Poll::Ready(Some(Ok(stream)))
} else {
if self.done {
return Poll::Ready(None);
}
let context = self.context.clone();
let offset = self.offset;
let stream = self.stream.clone();
self.page_request = Some(Box::pin(async move {
match context
.request(
format!("CONSUMER.NAMES.{stream}"),
&json!({
"offset": offset,
}),
)
.await?
{
Response::Err { error } => Err(RequestError::with_source(
super::context::RequestErrorKind::Other,
error,
)),
Response::Ok(page) => Ok(page),
}
}));
self.poll_next(cx)
}
}
}
}
}
pub type ConsumersErrorKind = StreamsErrorKind;
pub type ConsumersError = StreamsError;
type PageInfoRequest = BoxFuture<'static, Result<ConsumerInfoPage, RequestError>>;
pub struct Consumers {
context: Context,
stream: String,
offset: usize,
page_request: Option<PageInfoRequest>,
consumers: Vec<super::consumer::Info>,
done: bool,
}
impl futures::Stream for Consumers {
type Item = Result<super::consumer::Info, ConsumersError>;
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
match self.page_request.as_mut() {
Some(page) => match page.try_poll_unpin(cx) {
std::task::Poll::Ready(page) => {
self.page_request = None;
let page = page.map_err(|err| {
ConsumersError::with_source(ConsumersErrorKind::Other, err)
})?;
if let Some(consumers) = page.consumers {
self.offset += consumers.len();
self.consumers = consumers;
if self.offset >= page.total {
self.done = true;
}
match self.consumers.pop() {
Some(consumer) => Poll::Ready(Some(Ok(consumer))),
None => Poll::Ready(None),
}
} else {
Poll::Ready(None)
}
}
std::task::Poll::Pending => std::task::Poll::Pending,
},
None => {
if let Some(stream) = self.consumers.pop() {
Poll::Ready(Some(Ok(stream)))
} else {
if self.done {
return Poll::Ready(None);
}
let context = self.context.clone();
let offset = self.offset;
let stream = self.stream.clone();
self.page_request = Some(Box::pin(async move {
match context
.request(
format!("CONSUMER.LIST.{stream}"),
&json!({
"offset": offset,
}),
)
.await?
{
Response::Err { error } => Err(RequestError::with_source(
super::context::RequestErrorKind::Other,
error,
)),
Response::Ok(page) => Ok(page),
}
}));
self.poll_next(cx)
}
}
}
}
}
#[derive(Clone, Debug, PartialEq)]
pub enum LastRawMessageErrorKind {
NoMessageFound,
JetStream(super::errors::Error),
Other,
}
impl Display for LastRawMessageErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::NoMessageFound => write!(f, "no message found"),
Self::Other => write!(f, "failed to get last raw message"),
Self::JetStream(err) => write!(f, "JetStream error: {}", err),
}
}
}
pub type LastRawMessageError = Error<LastRawMessageErrorKind>;
pub type RawMessageErrorKind = LastRawMessageErrorKind;
pub type RawMessageError = LastRawMessageError;
#[derive(Clone, Debug, PartialEq)]
pub enum ConsumerErrorKind {
//TODO: get last should have timeout, which should be mapped here.
TimedOut,
Request,
InvalidConsumerType,
InvalidName,
JetStream(super::errors::Error),
Other,
}
impl Display for ConsumerErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::TimedOut => write!(f, "timed out"),
Self::Request => write!(f, "request failed"),
Self::JetStream(err) => write!(f, "JetStream error: {}", err),
Self::Other => write!(f, "consumer error"),
Self::InvalidConsumerType => write!(f, "invalid consumer type"),
Self::InvalidName => write!(f, "invalid consumer name"),
}
}
}
pub type ConsumerError = Error<ConsumerErrorKind>;
#[derive(Clone, Debug, PartialEq)]
pub enum ConsumerCreateStrictErrorKind {
//TODO: get last should have timeout, which should be mapped here.
TimedOut,
Request,
InvalidConsumerType,
InvalidName,
AlreadyExists,
JetStream(super::errors::Error),
Other,
}
impl Display for ConsumerCreateStrictErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::TimedOut => write!(f, "timed out"),
Self::Request => write!(f, "request failed"),
Self::JetStream(err) => write!(f, "JetStream error: {}", err),
Self::Other => write!(f, "consumer error"),
Self::InvalidConsumerType => write!(f, "invalid consumer type"),
Self::InvalidName => write!(f, "invalid consumer name"),
Self::AlreadyExists => write!(f, "consumer already exists"),
}
}
}
pub type ConsumerCreateStrictError = Error<ConsumerCreateStrictErrorKind>;
#[derive(Clone, Debug, PartialEq)]
pub enum ConsumerUpdateErrorKind {
//TODO: get last should have timeout, which should be mapped here.
TimedOut,
Request,
InvalidConsumerType,
InvalidName,
DoesNotExist,
JetStream(super::errors::Error),
Other,
}
impl Display for ConsumerUpdateErrorKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::TimedOut => write!(f, "timed out"),
Self::Request => write!(f, "request failed"),
Self::JetStream(err) => write!(f, "JetStream error: {}", err),
Self::Other => write!(f, "consumer error"),
Self::InvalidConsumerType => write!(f, "invalid consumer type"),
Self::InvalidName => write!(f, "invalid consumer name"),
Self::DoesNotExist => write!(f, "consumer does not exist"),
}
}
}
pub type ConsumerUpdateError = Error<ConsumerUpdateErrorKind>;
impl From<super::errors::Error> for ConsumerError {
fn from(err: super::errors::Error) -> Self {
ConsumerError::new(ConsumerErrorKind::JetStream(err))
}
}
impl From<super::errors::Error> for ConsumerCreateStrictError {
fn from(err: super::errors::Error) -> Self {
if err.error_code() == super::errors::ErrorCode::CONSUMER_ALREADY_EXISTS {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::AlreadyExists)
} else {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::JetStream(err))
}
}
}
impl From<super::errors::Error> for ConsumerUpdateError {
fn from(err: super::errors::Error) -> Self {
if err.error_code() == super::errors::ErrorCode::CONSUMER_DOES_NOT_EXIST {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::DoesNotExist)
} else {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::JetStream(err))
}
}
}
impl From<ConsumerError> for ConsumerUpdateError {
fn from(err: ConsumerError) -> Self {
match err.kind() {
ConsumerErrorKind::JetStream(err) => {
if err.error_code() == super::errors::ErrorCode::CONSUMER_DOES_NOT_EXIST {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::DoesNotExist)
} else {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::JetStream(err))
}
}
ConsumerErrorKind::Request => {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::Request)
}
ConsumerErrorKind::TimedOut => {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::TimedOut)
}
ConsumerErrorKind::InvalidConsumerType => {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::InvalidConsumerType)
}
ConsumerErrorKind::InvalidName => {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::InvalidName)
}
ConsumerErrorKind::Other => ConsumerUpdateError::new(ConsumerUpdateErrorKind::Other),
}
}
}
impl From<ConsumerError> for ConsumerCreateStrictError {
fn from(err: ConsumerError) -> Self {
match err.kind() {
ConsumerErrorKind::JetStream(err) => {
if err.error_code() == super::errors::ErrorCode::CONSUMER_ALREADY_EXISTS {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::AlreadyExists)
} else {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::JetStream(err))
}
}
ConsumerErrorKind::Request => {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::Request)
}
ConsumerErrorKind::TimedOut => {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::TimedOut)
}
ConsumerErrorKind::InvalidConsumerType => {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::InvalidConsumerType)
}
ConsumerErrorKind::InvalidName => {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::InvalidName)
}
ConsumerErrorKind::Other => {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::Other)
}
}
}
}
impl From<super::context::RequestError> for ConsumerError {
fn from(err: super::context::RequestError) -> Self {
match err.kind() {
RequestErrorKind::TimedOut => ConsumerError::new(ConsumerErrorKind::TimedOut),
_ => ConsumerError::with_source(ConsumerErrorKind::Request, err),
}
}
}
impl From<super::context::RequestError> for ConsumerUpdateError {
fn from(err: super::context::RequestError) -> Self {
match err.kind() {
RequestErrorKind::TimedOut => {
ConsumerUpdateError::new(ConsumerUpdateErrorKind::TimedOut)
}
_ => ConsumerUpdateError::with_source(ConsumerUpdateErrorKind::Request, err),
}
}
}
impl From<super::context::RequestError> for ConsumerCreateStrictError {
fn from(err: super::context::RequestError) -> Self {
match err.kind() {
RequestErrorKind::TimedOut => {
ConsumerCreateStrictError::new(ConsumerCreateStrictErrorKind::TimedOut)
}
_ => {
ConsumerCreateStrictError::with_source(ConsumerCreateStrictErrorKind::Request, err)
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn consumer_limits_de() {
let config = Config {
..Default::default()
};
let roundtrip: Config = {
let ser = serde_json::to_string(&config).unwrap();
serde_json::from_str(&ser).unwrap()
};
assert_eq!(config, roundtrip);
}
}