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|
use bollard::Docker;
use bollard::container::{
Config as ContainerConfig, CreateContainerOptions, RemoveContainerOptions,
StartContainerOptions, StopContainerOptions,
};
use bollard::image::CreateImageOptions;
use bollard::models::HostConfig;
use futures_util::StreamExt;
use std::collections::HashMap;
use crate::config::Config;
use crate::models::Instance;
#[derive(Clone)]
pub struct DockerManager {
client: Docker,
config: Config,
}
impl DockerManager {
pub fn new(config: Config) -> Result<Self, bollard::errors::Error> {
let client = Docker::connect_with_local_defaults()?;
Ok(Self { client, config })
}
/// Map a Minecraft version string (e.g. "1.12.2", "1.20.1") to the
/// appropriate itzg/minecraft-server Java image tag.
///
/// - < 1.17 → java8 (Minecraft 1.12.2 and earlier)
/// - 1.17 .. 1.20.4 → java17
/// - >= 1.20.5 → java21
fn java_tag(version: &str) -> &'static str {
// Parse major.minor from version strings like "1.12.2", "1.20.1", "1.21"
let parts: Vec<&str> = version.split('.').collect();
if parts.len() < 2 {
return "java17"; // sensible default
}
let major: u32 = parts.first().and_then(|s| s.parse().ok()).unwrap_or(1);
let minor: u32 = parts.get(1).and_then(|s| s.parse().ok()).unwrap_or(12);
if major <= 1 && minor < 17 {
"java8"
} else if major <= 1 && minor < 21 {
// 1.17.x through 1.20.4 use Java 17
"java17"
} else {
// 1.20.5+ and 1.21+ use Java 21
"java21"
}
}
/// Build the full image reference, e.g. "itzg/minecraft-server:java8"
fn image_ref(version: &str) -> String {
format!("itzg/minecraft-server:{}", Self::java_tag(version))
}
pub async fn start_container(&self, instance: &Instance) -> Result<(), String> {
let tag = Self::java_tag(&instance.version);
tracing::info!("Pulling itzg/minecraft-server:{tag} image...");
self.pull_image(tag).await?;
tracing::info!("Creating container for instance '{}'", instance.name);
self.recreate_container(instance).await?;
tracing::info!("Starting container...");
self.start_existing().await
}
async fn pull_image(&self, tag: &str) -> Result<(), String> {
let options = CreateImageOptions {
from_image: "itzg/minecraft-server",
tag,
..Default::default()
};
let mut stream = self.client.create_image(Some(options), None, None);
while let Some(result) = stream.next().await {
match result {
Ok(_info) => {}
Err(e) => return Err(format!("Image pull failed: {e}")),
}
}
Ok(())
}
async fn recreate_container(&self, instance: &Instance) -> Result<(), String> {
// Remove existing container if present
let remove_options = RemoveContainerOptions {
force: true,
..Default::default()
};
match self
.client
.remove_container("mc", Some(remove_options))
.await
{
Ok(_) => tracing::info!("Removed existing container"),
Err(e) => tracing::debug!("No existing container to remove: {e}"),
}
let server_dir = self
.config
.server_directory
.canonicalize()
.unwrap_or_else(|_| self.config.server_directory.clone())
.display()
.to_string();
let instance_data = format!("{server_dir}/instances/{}/data", instance.name);
let image_ref = Self::image_ref(&instance.version);
let mut env_strings: Vec<String> = vec![
"EULA=TRUE".into(),
format!("VERSION={}", instance.version),
format!("TYPE={}", instance.server_type),
format!("MEMORY={}M", instance.memory_mb),
format!("MAX_PLAYERS={}", instance.max_players),
format!("DIFFICULTY={}", instance.difficulty),
"FORCE_GAMEMODE=true".into(),
"SPAWN_PROTECTION=0".into(),
format!("ENABLE_WHITELIST={}", instance.whitelist_enabled),
"PAUSE_WHEN_EMPTY_SECONDS=30".into(),
"ONLINE_MODE=false".into(),
"TZ=Europe/Warsaw".into(),
"USE_AIKAR_FLAGS=true".into(),
"ENABLE_RCON=true".into(),
format!("RCON_PASSWORD={}", instance.rcon_password),
"RCON_PORT=25575".into(),
"JVM_OPTS=-Dfml.queryResult=confirm".into(),
format!("MOTD={}", instance.motd),
format!("GAMEMODE={}", instance.gamemode),
format!("LEVEL_TYPE={}", instance.level_type),
];
if instance.pvp {
env_strings.push("PVP=true".into());
} else {
env_strings.push("PVP=false".into());
}
if let Some(ref seed) = instance.world_seed
&& !seed.is_empty()
{
env_strings.push(format!("LEVEL_SEED={seed}"));
}
let mut exposed_ports: HashMap<String, HashMap<(), ()>> = HashMap::new();
exposed_ports.insert("25565/tcp".into(), HashMap::new());
exposed_ports.insert("25575/tcp".into(), HashMap::new());
let mut port_bindings = HashMap::new();
port_bindings.insert(
"25565/tcp".to_string(),
Some(vec![bollard::models::PortBinding {
host_ip: None,
host_port: Some("25565".to_string()),
}]),
);
port_bindings.insert(
"25575/tcp".to_string(),
Some(vec![bollard::models::PortBinding {
host_ip: None,
host_port: Some("25575".to_string()),
}]),
);
let host_config = HostConfig {
binds: Some(vec![format!("{instance_data}:/data")]),
port_bindings: Some(port_bindings),
network_mode: Some("host".into()),
..Default::default()
};
let container_config = ContainerConfig {
image: Some(image_ref.clone()),
tty: Some(true),
env: Some(env_strings.clone()),
exposed_ports: Some(exposed_ports),
host_config: Some(host_config),
..Default::default()
};
let options = CreateContainerOptions {
name: "mc",
..Default::default()
};
self.client
.create_container(Some(options), container_config)
.await
.map_err(|e| format!("Failed to create container: {e}"))?;
tracing::info!("Container 'mc' created successfully");
Ok(())
}
async fn start_existing(&self) -> Result<(), String> {
self.client
.start_container("mc", None::<StartContainerOptions<&str>>)
.await
.map_err(|e| format!("Failed to start container: {e}"))?;
Ok(())
}
pub async fn stop_container(&self) -> Result<(), String> {
let options = StopContainerOptions { t: 30 };
self.client
.stop_container("mc", Some(options))
.await
.map_err(|e| format!("Failed to stop container: {e}"))?;
Ok(())
}
}
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