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//! Connection options.
use std::sync::Arc;
use url::Url;
use crate::buffer_pool::{BufferPool, GLOBAL_BUFFER_POOL};
use crate::error::Error;
/// SSL connection mode.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum SslMode {
/// Don't use SSL
Disable,
/// Try SSL, fall back to unencrypted if not supported
#[default]
Prefer,
/// Require SSL connection
Require,
}
/// Connection options for PostgreSQL.
#[derive(Debug, Clone)]
pub struct Opts {
/// Hostname or IP address.
///
/// Default: `""`
pub host: String,
/// Port number for the PostgreSQL server.
///
/// Default: `5432`
pub port: u16,
/// Unix socket path.
///
/// Default: `None`
pub socket: Option<String>,
/// Username for authentication.
///
/// Default: `""`
pub user: String,
/// Database name to use.
///
/// Default: `None`
pub database: Option<String>,
/// Password for authentication.
///
/// Default: `None`
pub password: Option<String>,
/// Application name to report to the server.
///
/// Default: `None`
pub application_name: Option<String>,
/// SSL connection mode.
///
/// Default: `SslMode::Prefer`
pub ssl_mode: SslMode,
/// Additional connection parameters.
///
/// Default: `[]`
pub params: Vec<(String, String)>,
/// When connected via TCP to loopback, upgrade to Unix socket for better performance.
///
/// Default: `true`
pub upgrade_to_unix_socket: bool,
/// Maximum number of idle connections in the pool.
///
/// Default: `100`
pub pool_max_idle_conn: usize,
/// Maximum number of concurrent connections (None = unlimited).
///
/// Default: `None`
pub pool_max_concurrency: Option<usize>,
/// Buffer pool for reusing buffers across connections.
///
/// Default: `GLOBAL_BUFFER_POOL`
pub buffer_pool: Arc<BufferPool>,
}
impl Default for Opts {
fn default() -> Self {
Self {
host: String::new(),
port: 5432,
socket: None,
user: String::new(),
database: None,
password: None,
application_name: None,
ssl_mode: SslMode::Prefer,
params: Vec::new(),
upgrade_to_unix_socket: true,
pool_max_idle_conn: 100,
pool_max_concurrency: None,
buffer_pool: Arc::clone(&GLOBAL_BUFFER_POOL),
}
}
}
impl TryFrom<&Url> for Opts {
type Error = Error;
/// Parse a PostgreSQL connection URL.
///
/// Format: `(pg|postgres|postgresql)://[user[:password]@]host[:port][/database][?param1=value1¶m2=value2&..]`
///
/// Supported query parameters:
/// - `sslmode` or `ssl_mode`: disable, prefer, require
/// - `application_name`: application name
/// - `upgrade_to_unix_socket`: true/True/1/yes/on or false/False/0/no/off
/// - `pool_max_idle_conn`: maximum idle connections (positive integer)
/// - `pool_max_concurrency`: maximum concurrent connections (positive integer)
fn try_from(url: &Url) -> Result<Self, Self::Error> {
if !["pg", "postgres", "postgresql"].contains(&url.scheme()) {
return Err(Error::InvalidUsage(format!(
"Invalid scheme: expected 'pg://', 'postgres://', or 'postgresql://', got '{}://'",
url.scheme()
)));
}
let mut opts = Opts {
host: url.host_str().unwrap_or("localhost").to_string(),
port: url.port().unwrap_or(5432),
user: url.username().to_string(),
password: url.password().map(|s| s.to_string()),
database: url.path().strip_prefix('/').and_then(|s| {
if s.is_empty() {
None
} else {
Some(s.to_string())
}
}),
..Opts::default()
};
for (key, value) in url.query_pairs() {
match key.as_ref() {
"sslmode" | "ssl_mode" => {
opts.ssl_mode = match value.as_ref() {
"disable" => SslMode::Disable,
"prefer" => SslMode::Prefer,
"require" => SslMode::Require,
_ => {
return Err(Error::InvalidUsage(format!(
"Invalid sslmode: expected one of ['disable', 'prefer', 'require'], got {}",
value
)));
}
};
}
"application_name" => {
opts.application_name = Some(value.to_string());
}
"upgrade_to_unix_socket" => {
opts.upgrade_to_unix_socket = match value.as_ref() {
"true" | "True" | "1" | "yes" | "on" => true,
"false" | "False" | "0" | "no" | "off" => false,
_ => {
return Err(Error::InvalidUsage(format!(
"Invalid upgrade_to_unix_socket parameter: {}",
value
)));
}
};
}
"pool_max_idle_conn" => {
opts.pool_max_idle_conn = value.parse().map_err(|_unhelpful_err| {
Error::InvalidUsage(format!("Invalid pool_max_idle_conn: {}", value))
})?;
}
"pool_max_concurrency" => {
opts.pool_max_concurrency = Some(value.parse().map_err(|_unhelpful_err| {
Error::InvalidUsage(format!("Invalid pool_max_concurrency: {}", value))
})?);
}
_ => {
opts.params.push((key.to_string(), value.to_string()));
}
}
}
Ok(opts)
}
}
impl TryFrom<&str> for Opts {
type Error = Error;
fn try_from(s: &str) -> Result<Self, Self::Error> {
let url = Url::parse(s).map_err(|e| Error::InvalidUsage(format!("Invalid URL: {}", e)))?;
Self::try_from(&url)
}
}