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//! The Rust client library for writing streaming applications with Fluvio //! //! Fluvio is a high performance, low latency data streaming platform built for developers. //! //! When writing streaming applications, two of your core behaviors are producing messages //! and consuming messages. When you produce a message, you send it to a Fluvio cluster //! where it is recorded and saved for later usage. When you consume a message, you are //! reading a previously-stored message from that same Fluvio cluster. Let's get started //! with a quick example where we produce and consume some messages. //! //! # Prerequisites //! //! [Install Fluvio](#installation) //! //! # Fluvio Echo //! //! The easiest way to see Fluvio in action is to produce some messages and to consume //! them right away. In this sense, we can use Fluvio to make an "echo service". //! //! All messages in Fluvio are sent in a sort of category called a `Topic`. You can think //! of a Topic as a named folder where you want to store some files, which would be your //! messages. If you're familiar with relational databases, you can think of a Topic as //! being similar to a database table, but for streaming. //! //! As the application developer, you get to decide what Topics you create and which //! messages you send to them. We need to set up a Topic before running our code. For the //! echo example, we'll call our topic `echo`. //! //! # Example //! //! The easiest way to create a Fluvio Topic is by using the [Fluvio CLI]. //! //! ```bash //! $ fluvio topic create echo //! topic "echo" created //! ``` //! //! There are convenience methods that let you get up-and-started quickly using default //! configurations. Later if you want to customize your setup, you can directly use the //! [`Fluvio`] client object. //! //! ```no_run //! # mod futures { //! # pub use futures_util::stream::StreamExt; //! # } //! use std::time::Duration; //! use fluvio::{Offset, FluvioError}; //! use futures::StreamExt; //! //! async_std::task::spawn(produce_records()); //! if let Err(e) = async_std::task::block_on(consume_records()) { //! println!("Error: {}", e); //! } //! //! async fn produce_records() -> Result<(), FluvioError> { //! let producer = fluvio::producer("echo").await?; //! for i in 0..10u8 { //! producer.send_record(format!("Hello, Fluvio {}!", i), 0).await?; //! async_std::task::sleep(Duration::from_secs(1)).await; //! } //! Ok(()) //! } //! //! async fn consume_records() -> Result<(), FluvioError> { //! let consumer = fluvio::consumer("echo", 0).await?; //! let mut stream = consumer.stream(Offset::beginning()).await?; //! //! while let Some(Ok(record)) = stream.next().await { //! if let Some(bytes) = record.try_into_bytes() { //! let string = String::from_utf8_lossy(&bytes); //! println!("Got record: {}", string); //! } //! } //! Ok(()) //! } //! ``` //! //! [Fluvio CLI]: https://nightly.fluvio.io/docs/cli/ //! [`Fluvio`]: ./struct.Fluvio.html #![cfg_attr( feature = "nightly", doc(include = "../../../website/kubernetes/INSTALL.md") )] mod error; mod client; mod admin; mod params; pub mod consumer; mod producer; mod offset; mod sync; mod spu; pub mod config; pub use error::FluvioError; pub use config::FluvioConfig; pub use producer::TopicProducer; pub use consumer::{PartitionConsumer, ConsumerConfig}; pub use offset::Offset; pub use crate::admin::FluvioAdmin; pub use crate::client::Fluvio; /// Creates a producer that sends events to the named topic /// /// This is a shortcut function that uses the current profile /// settings. If you need to specify any custom configurations, /// try directly creating a [`Fluvio`] client object instead. /// /// # Example /// /// ```no_run /// # use fluvio::FluvioError; /// # async fn do_produce() -> Result<(), FluvioError> { /// let producer = fluvio::producer("my-topic").await?; /// producer.send_record("Hello, world!", 0).await?; /// # Ok(()) /// # } /// ``` /// /// [`Fluvio`]: ./struct.Fluvio.html pub async fn producer<S: Into<String>>(topic: S) -> Result<TopicProducer, FluvioError> { let fluvio = Fluvio::connect().await?; let producer = fluvio.topic_producer(topic).await?; Ok(producer) } /// Creates a producer that receives events from the given topic and partition /// /// This is a shortcut function that uses the current profile /// settings. If you need to specify any custom configurations, /// try directly creating a [`Fluvio`] client object instead. /// /// # Example /// /// ```no_run /// # use fluvio::{ConsumerConfig, FluvioError, Offset}; /// # mod futures { /// # pub use futures_util::stream::StreamExt; /// # } /// # async fn do_consume() -> Result<(), FluvioError> { /// use futures::StreamExt; /// let consumer = fluvio::consumer("my-topic", 0).await?; /// let mut stream = consumer.stream(Offset::beginning()).await?; /// while let Some(Ok(record)) = stream.next().await { /// if let Some(bytes) = record.try_into_bytes() { /// let string = String::from_utf8_lossy(&bytes); /// println!("Got record: {}", string); /// } /// } /// # Ok(()) /// # } /// ``` /// /// [`Fluvio`]: ./struct.Fluvio.html pub async fn consumer<S: Into<String>>( topic: S, partition: i32, ) -> Result<PartitionConsumer, FluvioError> { let fluvio = Fluvio::connect().await?; let consumer = fluvio.partition_consumer(topic, partition).await?; Ok(consumer) } /// re-export metadata from sc-api pub mod metadata { pub mod topic { pub use fluvio_sc_schema::topic::*; } pub mod spu { pub use fluvio_sc_schema::spu::*; } pub mod spg { pub use fluvio_sc_schema::spg::*; } pub mod partition { pub use fluvio_sc_schema::partition::*; } pub mod objects { pub use fluvio_sc_schema::objects::*; } pub mod core { pub use fluvio_sc_schema::core::*; } pub mod store { pub use fluvio_sc_schema::store::*; } } pub mod dataplane { pub use dataplane::*; }