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"macro-diagnostics"] } +thiserror = "1.0.40" +regex = "1.10" +futures-util = "0.3" diff --git a/src/db.rs b/src/db.rs new file mode 100644 index 0000000..f6ef784 --- /dev/null +++ b/src/db.rs @@ -0,0 +1,265 @@ +//! Database abstraction to manage Katana instances. +//! +use async_trait::async_trait; +use regex::Regex; +use std::collections::HashMap; +use uuid::Uuid; + +/// Errors for DB operations. +#[derive(Debug, thiserror::Error)] +pub enum DbError { + #[error("An error occurred: {0}")] + Generic(String), + #[error("Entity already in the database: {0}")] + AlreadyExists(String), +} + +/// Katana instance info, used to track +/// the spawned instances in docker containers. +/// The `name` of an instance must follow the `is_valid_instance_name` rules. +#[derive(Debug, Clone, PartialEq)] +pub struct InstanceInfo { + pub container_id: String, + pub proxied_port: u16, + pub name: String, + pub api_key: String, +} + +/// User's info. +#[derive(Debug, Clone, PartialEq)] +pub struct UserInfo { + pub name: String, + pub api_key: String, +} + +/// +fn is_valid_instance_name(name: &str) -> bool { + let re = Regex::new(r"^[a-z0-9]+$").unwrap(); + re.is_match(name) +} + +#[async_trait] +pub trait ProxifierDb: Send + Sync { + async fn user_add(&mut self, name: &str, api_key: Option) -> Result; + async fn user_from_api_key(&self, api_key: &str) -> Result, DbError>; + async fn instance_from_name(&self, name: &str) -> Result, DbError>; + async fn instance_add(&mut self, info: &InstanceInfo) -> Result<(), DbError>; + async fn instance_rm(&mut self, name: &str) -> Result<(), DbError>; + async fn is_port_in_use(&self, port: u16) -> Result; +} + +/// Default implementation fully in memory of the ProxifierDb. +pub enum AnyEntry { + User(UserInfo), + Instance(InstanceInfo), +} + +pub struct HashMapDb { + map: HashMap, +} + +impl HashMapDb { + pub fn new() -> Self { + Self { + map: HashMap::new(), + } + } + + fn get_user_key(&self, api_key: &str) -> String { + format!("USER#{}", api_key) + } + + fn get_instance_key(&self, name: &str) -> String { + format!("INSTANCE#{}", name) + } +} + +#[async_trait] +impl ProxifierDb for HashMapDb { + async fn user_add(&mut self, name: &str, api_key: Option) -> Result { + let name = name.to_string(); + let api_key = if let Some(k) = api_key { + if (self.user_from_api_key(&k).await?).is_some() { + return Err(DbError::AlreadyExists(format!("api-key {}", k))); + } else { + k + } + } else { + Uuid::new_v4().to_string() + }; + + let user_key = self.get_user_key(&api_key); + + let info = UserInfo { name, api_key }; + + self.map.insert(user_key, AnyEntry::User(info.clone())); + Ok(info) + } + + async fn user_from_api_key(&self, api_key: &str) -> Result, DbError> { + let user_key = self.get_user_key(&api_key); + if let Some(AnyEntry::User(info)) = self.map.get(&user_key) { + Ok(Some(info.clone())) + } else { + Ok(None) + } + } + + async fn instance_from_name(&self, name: &str) -> Result, DbError> { + let instance_key = self.get_instance_key(&name); + if let Some(AnyEntry::Instance(info)) = self.map.get(&instance_key) { + Ok(Some(info.clone())) + } else { + Ok(None) + } + } + + async fn instance_add(&mut self, info: &InstanceInfo) -> Result<(), DbError> { + if (self.instance_from_name(&info.name).await?).is_some() { + return Err(DbError::AlreadyExists(format!( + "Instance {} already exists", + info.name + ))); + } + + let instance_key = self.get_instance_key(&info.name); + + self.map + .insert(instance_key, AnyEntry::Instance(info.clone())); + Ok(()) + } + + async fn instance_rm(&mut self, name: &str) -> Result<(), DbError> { + if (self.instance_from_name(name).await?).is_some() { + let instance_key = self.get_instance_key(name); + self.map.remove(&instance_key); + } + + Ok(()) + } + + async fn is_port_in_use(&self, port: u16) -> Result { + for (key, value) in self.map.iter() { + if !key.starts_with("INSTANCE#") { + continue; + } + + if let AnyEntry::Instance(info) = value { + if info.proxied_port == port { + return Ok(true); + } + } + } + + Ok(false) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[tokio::test] + async fn test_hashmap_db_user_add() { + let mut db = HashMapDb::new(); + let u = db.user_add("user1", None).await.unwrap(); + + assert_eq!(u.name, "user1"); + } + + #[tokio::test] + async fn test_hashmap_db_user_from_api_key() { + let mut db = HashMapDb::new(); + + let u = db.user_from_api_key("abcd").await.unwrap(); + assert_eq!(u, None); + + db.user_add("user1", Some("my-key".to_string())) + .await + .unwrap(); + + let u = db.user_from_api_key("my-key").await.unwrap(); + assert_eq!( + u, + Some(UserInfo { + name: "user1".to_string(), + api_key: "my-key".to_string(), + }) + ); + } + + #[tokio::test] + async fn test_hashmap_db_instance_add() { + let mut db = HashMapDb::new(); + let i = InstanceInfo { + container_id: "1".to_string(), + api_key: "my-key".to_string(), + name: "test1".to_string(), + proxied_port: 1234, + }; + + db.instance_add(&i).await.unwrap(); + } + + #[tokio::test] + async fn test_hashmap_db_instance_from_name() { + let mut db = HashMapDb::new(); + + let db_i = db.instance_from_name("test1").await.unwrap(); + assert_eq!(db_i, None); + + let i = InstanceInfo { + container_id: "1".to_string(), + api_key: "my-key".to_string(), + name: "test1".to_string(), + proxied_port: 1234, + }; + + db.instance_add(&i).await.unwrap(); + + let db_i = db.instance_from_name("test1").await.unwrap(); + assert_eq!(db_i, Some(i)); + } + + #[tokio::test] + async fn test_hashmap_db_instance_rm() { + let mut db = HashMapDb::new(); + + db.instance_rm("test1").await.unwrap(); + + let i = InstanceInfo { + container_id: "1".to_string(), + api_key: "my-key".to_string(), + name: "test1".to_string(), + proxied_port: 1234, + }; + + db.instance_add(&i).await.unwrap(); + + let db_i = db.instance_from_name("test1").await.unwrap(); + assert_eq!(db_i, Some(i)); + + db.instance_rm("test1").await.unwrap(); + + let db_i = db.instance_from_name("test1").await.unwrap(); + assert_eq!(db_i, None); + } + + #[tokio::test] + async fn test_hashmap_db_is_port_in_use() { + let mut db = HashMapDb::new(); + + assert_eq!(db.is_port_in_use(1234).await.unwrap(), false); + + let i = InstanceInfo { + container_id: "1".to_string(), + api_key: "my-key".to_string(), + name: "test1".to_string(), + proxied_port: 1234, + }; + + db.instance_add(&i).await.unwrap(); + + assert_eq!(db.is_port_in_use(1234).await.unwrap(), true); + } +} diff --git a/src/docker_manager.rs b/src/docker_manager.rs new file mode 100644 index 0000000..feb9b75 --- /dev/null +++ b/src/docker_manager.rs @@ -0,0 +1,90 @@ +//! Docker abstraction to create, start and stop containers. +use shiplift::{errors::Error as ShipliftError, ContainerOptions, Docker, LogsOptions}; +use shiplift::tty::TtyChunk; +use futures_util::stream::StreamExt; +use tracing::{debug, trace}; + +/// Errors for docker operations. +#[derive(Debug, thiserror::Error)] +pub enum DockerError { + #[error("An error occurred: {0}")] + Generic(String), + #[error("Shiplift error: {0}")] + Shiplift(ShipliftError), +} + +impl From for DockerError { + fn from(e: ShipliftError) -> Self { + Self::Shiplift(e) + } +} + +pub struct DockerManager { + docker: Docker, + image: String, +} + +impl DockerManager { + pub fn new(image: &str) -> Self { + Self { + docker: Docker::new(), + image: image.to_string(), + } + } + + pub async fn create(&self, port: u32) -> Result { + let c = self + .docker + .containers() + .create( + &ContainerOptions::builder(self.image.as_ref()) + .expose(port, "tcp", port) + .cmd(vec!["katana", "--port", &port.to_string()]) + .build(), + ) + .await?; + + trace!("created {}", c.id); + Ok(c.id) + } + + pub async fn remove(&self, container_id: &str) -> Result<(), DockerError> { + let c = self.docker.containers().get(container_id); + trace!("stopping {}", container_id); + c.stop(None).await?; + trace!("deleting {}", container_id); + c.delete().await?; + Ok(()) + } + + pub async fn start(&self, container_id: &str) -> Result<(), DockerError> { + trace!("starting {}", container_id); + self.docker.containers().get(container_id).start().await?; + Ok(()) + } + + pub async fn logs(&self, container_id: &str) -> Result { + let mut output: String = String::new(); + + let mut logs_stream = self.docker + .containers() + .get(container_id) + .logs(&LogsOptions::builder().stdout(true).stderr(true).tail("all").build()); + + while let Some(log_result) = logs_stream.next().await { + match log_result { + Ok(chunk) => { + match chunk { + TtyChunk::StdOut(bytes) => output.push_str(std::str::from_utf8(&bytes).unwrap()), + TtyChunk::StdErr(bytes) => output.push_str(std::str::from_utf8(&bytes).unwrap()), + TtyChunk::StdIn(_) => unreachable!(), + } + + } + Err(e) => return Err(DockerError::Shiplift(e)), + }; + }; + + Ok(output) + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..cebb095 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,65 @@ +//! A Katana (reverse)proxifier, to easily spawn a new Katana +//! for CI purposes mainly. +//! +//! This proxifier uses docker to spin up a new instance of Katana +//! and then manage it internally using the name provided by the user. +//! This version is fully on-memory, and will drop every managed service +//! if killed. +use shiplift::{ContainerOptions, Docker}; +use std::collections::HashMap; +use std::error::Error; +use tokio::time::{sleep, Duration}; +use tracing::{debug, info, trace}; +use tracing_subscriber::{EnvFilter, FmtSubscriber}; + +mod db; +use db::HashMapDb; + +mod docker_manager; +use docker_manager::DockerManager; + +#[tokio::main] +async fn main() -> Result<(), Box> { + init_logging()?; + + let mut db = HashMapDb::new(); + let docker = DockerManager::new("katana"); + + let id = docker.create(8899).await?; + info!("id {}", id); + + sleep(Duration::from_millis(2000)).await; + + docker.start(&id).await?; + + sleep(Duration::from_millis(2000)).await; + + let logs = docker.logs(&id).await?; + debug!("{}", logs); + + sleep(Duration::from_millis(10000)).await; + + sleep(Duration::from_millis(2000)).await; + + let logs = docker.logs(&id).await?; + debug!("{}", logs); + + docker.remove(&id).await?; + + + Ok(()) +} + +fn init_logging() -> Result<(), Box> { + const DEFAULT_LOG_FILTER: &str = "info,katana=trace"; + + let subscriber = FmtSubscriber::builder() + .with_env_filter( + EnvFilter::try_from_default_env().or(EnvFilter::try_new(DEFAULT_LOG_FILTER))?, + ) + .finish(); + + tracing::subscriber::set_global_default(subscriber).expect("setting default subscriber failed"); + + Ok(()) +}