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//! Connection configuration.
#[cfg(feature = "runtime")]
use crate::connect::connect;
use crate::connect_raw::connect_raw;
#[cfg(not(target_arch = "wasm32"))]
use crate::keepalive::KeepaliveConfig;
#[cfg(feature = "runtime")]
use crate::tls::MakeTlsConnect;
use crate::tls::TlsConnect;
#[cfg(feature = "runtime")]
use crate::Socket;
use crate::{Client, Connection, Error};
use std::borrow::Cow;
#[cfg(unix)]
use std::ffi::OsStr;
use std::net::IpAddr;
use std::ops::Deref;
#[cfg(unix)]
use std::os::unix::ffi::OsStrExt;
#[cfg(unix)]
use std::path::{Path, PathBuf};
use std::str;
use std::str::FromStr;
use std::time::Duration;
use std::{error, fmt, iter, mem};
use tokio::io::{AsyncRead, AsyncWrite};
/// Properties required of a session.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[non_exhaustive]
pub enum TargetSessionAttrs {
/// No special properties are required.
Any,
/// The session must allow writes.
ReadWrite,
/// The session allow only reads.
ReadOnly,
}
/// TLS configuration.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[non_exhaustive]
pub enum SslMode {
/// Do not use TLS.
Disable,
/// Attempt to connect with TLS but allow sessions without.
Prefer,
/// Require the use of TLS.
Require,
}
/// Channel binding configuration.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[non_exhaustive]
pub enum ChannelBinding {
/// Do not use channel binding.
Disable,
/// Attempt to use channel binding but allow sessions without.
Prefer,
/// Require the use of channel binding.
Require,
}
/// Load balancing configuration.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[non_exhaustive]
pub enum LoadBalanceHosts {
/// Make connection attempts to hosts in the order provided.
Disable,
/// Make connection attempts to hosts in a random order.
Random,
}
/// A host specification.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Host {
/// A TCP hostname.
Tcp(String),
/// A path to a directory containing the server's Unix socket.
///
/// This variant is only available on Unix platforms.
#[cfg(unix)]
Unix(PathBuf),
}
/// Connection configuration.
///
/// Configuration can be parsed from libpq-style connection strings. These strings come in two formats:
///
/// # Key-Value
///
/// This format consists of space-separated key-value pairs. Values which are either the empty string or contain
/// whitespace should be wrapped in `'`. `'` and `\` characters should be backslash-escaped.
///
/// ## Keys
///
/// * `user` - The username to authenticate with. Defaults to the user executing this process.
/// * `password` - The password to authenticate with.
/// * `dbname` - The name of the database to connect to. Defaults to the username.
/// * `options` - Command line options used to configure the server.
/// * `application_name` - Sets the `application_name` parameter on the server.
/// * `sslmode` - Controls usage of TLS. If set to `disable`, TLS will not be used. If set to `prefer`, TLS will be used
/// if available, but not used otherwise. If set to `require`, TLS will be forced to be used. Defaults to `prefer`.
/// * `host` - The host to connect to. On Unix platforms, if the host starts with a `/` character it is treated as the
/// path to the directory containing Unix domain sockets. Otherwise, it is treated as a hostname. Multiple hosts
/// can be specified, separated by commas. Each host will be tried in turn when connecting. Required if connecting
/// with the `connect` method.
/// * `hostaddr` - Numeric IP address of host to connect to. This should be in the standard IPv4 address format,
/// e.g., 172.28.40.9. If your machine supports IPv6, you can also use those addresses.
/// If this parameter is not specified, the value of `host` will be looked up to find the corresponding IP address,
/// or if host specifies an IP address, that value will be used directly.
/// Using `hostaddr` allows the application to avoid a host name look-up, which might be important in applications
/// with time constraints. However, a host name is required for TLS certificate verification.
/// Specifically:
/// * If `hostaddr` is specified without `host`, the value for `hostaddr` gives the server network address.
/// The connection attempt will fail if the authentication method requires a host name;
/// * If `host` is specified without `hostaddr`, a host name lookup occurs;
/// * If both `host` and `hostaddr` are specified, the value for `hostaddr` gives the server network address.
/// The value for `host` is ignored unless the authentication method requires it,
/// in which case it will be used as the host name.
/// * `port` - The port to connect to. Multiple ports can be specified, separated by commas. The number of ports must be
/// either 1, in which case it will be used for all hosts, or the same as the number of hosts. Defaults to 5432 if
/// omitted or the empty string.
/// * `connect_timeout` - The time limit in seconds applied to each socket-level connection attempt. Note that hostnames
/// can resolve to multiple IP addresses, and this limit is applied to each address. Defaults to no timeout.
/// * `tcp_user_timeout` - The time limit that transmitted data may remain unacknowledged before a connection is forcibly closed.
/// This is ignored for Unix domain socket connections. It is only supported on systems where TCP_USER_TIMEOUT is available
/// and will default to the system default if omitted or set to 0; on other systems, it has no effect.
/// * `keepalives` - Controls the use of TCP keepalive. A value of 0 disables keepalive and nonzero integers enable it.
/// This option is ignored when connecting with Unix sockets. Defaults to on.
/// * `keepalives_idle` - The number of seconds of inactivity after which a keepalive message is sent to the server.
/// This option is ignored when connecting with Unix sockets. Defaults to 2 hours.
/// * `keepalives_interval` - The time interval between TCP keepalive probes.
/// This option is ignored when connecting with Unix sockets.
/// * `keepalives_retries` - The maximum number of TCP keepalive probes that will be sent before dropping a connection.
/// This option is ignored when connecting with Unix sockets.
/// * `target_session_attrs` - Specifies requirements of the session. If set to `read-write`, the client will check that
/// the `transaction_read_write` session parameter is set to `on`. This can be used to connect to the primary server
/// in a database cluster as opposed to the secondary read-only mirrors. Defaults to `all`.
/// * `channel_binding` - Controls usage of channel binding in the authentication process. If set to `disable`, channel
/// binding will not be used. If set to `prefer`, channel binding will be used if available, but not used otherwise.
/// If set to `require`, the authentication process will fail if channel binding is not used. Defaults to `prefer`.
/// * `load_balance_hosts` - Controls the order in which the client tries to connect to the available hosts and
/// addresses. Once a connection attempt is successful no other hosts and addresses will be tried. This parameter
/// is typically used in combination with multiple host names or a DNS record that returns multiple IPs. If set to
/// `disable`, hosts and addresses will be tried in the order provided. If set to `random`, hosts will be tried
/// in a random order, and the IP addresses resolved from a hostname will also be tried in a random order. Defaults
/// to `disable`.
///
/// ## Examples
///
/// ```not_rust
/// host=localhost user=postgres connect_timeout=10 keepalives=0
/// ```
///
/// ```not_rust
/// host=/var/lib/postgresql,localhost port=1234 user=postgres password='password with spaces'
/// ```
///
/// ```not_rust
/// host=host1,host2,host3 port=1234,,5678 hostaddr=127.0.0.1,127.0.0.2,127.0.0.3 user=postgres target_session_attrs=read-write
/// ```
///
/// ```not_rust
/// host=host1,host2,host3 port=1234,,5678 user=postgres target_session_attrs=read-write
/// ```
///
/// # Url
///
/// This format resembles a URL with a scheme of either `postgres://` or `postgresql://`. All components are optional,
/// and the format accepts query parameters for all of the key-value pairs described in the section above. Multiple
/// host/port pairs can be comma-separated. Unix socket paths in the host section of the URL should be percent-encoded,
/// as the path component of the URL specifies the database name.
///
/// ## Examples
///
/// ```not_rust
/// postgresql://user@localhost
/// ```
///
/// ```not_rust
/// postgresql://user:password@%2Fvar%2Flib%2Fpostgresql/mydb?connect_timeout=10
/// ```
///
/// ```not_rust
/// postgresql://user@host1:1234,host2,host3:5678?target_session_attrs=read-write
/// ```
///
/// ```not_rust
/// postgresql:///mydb?user=user&host=/var/lib/postgresql
/// ```
#[derive(Clone, PartialEq, Eq)]
pub struct Config {
pub(crate) user: Option<String>,
pub(crate) password: Option<Vec<u8>>,
pub(crate) dbname: Option<String>,
pub(crate) options: Option<String>,
pub(crate) application_name: Option<String>,
pub(crate) ssl_mode: SslMode,
pub(crate) host: Vec<Host>,
pub(crate) hostaddr: Vec<IpAddr>,
pub(crate) port: Vec<u16>,
pub(crate) connect_timeout: Option<Duration>,
pub(crate) tcp_user_timeout: Option<Duration>,
pub(crate) keepalives: bool,
#[cfg(not(target_arch = "wasm32"))]
pub(crate) keepalive_config: KeepaliveConfig,
pub(crate) target_session_attrs: TargetSessionAttrs,
pub(crate) channel_binding: ChannelBinding,
pub(crate) load_balance_hosts: LoadBalanceHosts,
}
impl Default for Config {
fn default() -> Config {
Config::new()
}
}
impl Config {
/// Creates a new configuration.
pub fn new() -> Config {
Config {
user: None,
password: None,
dbname: None,
options: None,
application_name: None,
ssl_mode: SslMode::Prefer,
host: vec![],
hostaddr: vec![],
port: vec![],
connect_timeout: None,
tcp_user_timeout: None,
keepalives: true,
#[cfg(not(target_arch = "wasm32"))]
keepalive_config: KeepaliveConfig {
idle: Duration::from_secs(2 * 60 * 60),
interval: None,
retries: None,
},
target_session_attrs: TargetSessionAttrs::Any,
channel_binding: ChannelBinding::Prefer,
load_balance_hosts: LoadBalanceHosts::Disable,
}
}
/// Sets the user to authenticate with.
///
/// Defaults to the user executing this process.
pub fn user(&mut self, user: impl Into<String>) -> &mut Config {
self.user = Some(user.into());
self
}
/// Gets the user to authenticate with, if one has been configured with
/// the `user` method.
pub fn get_user(&self) -> Option<&str> {
self.user.as_deref()
}
/// Sets the password to authenticate with.
pub fn password<T>(&mut self, password: T) -> &mut Config
where
T: AsRef<[u8]>,
{
self.password = Some(password.as_ref().to_vec());
self
}
/// Gets the password to authenticate with, if one has been configured with
/// the `password` method.
pub fn get_password(&self) -> Option<&[u8]> {
self.password.as_deref()
}
/// Sets the name of the database to connect to.
///
/// Defaults to the user.
pub fn dbname(&mut self, dbname: impl Into<String>) -> &mut Config {
self.dbname = Some(dbname.into());
self
}
/// Gets the name of the database to connect to, if one has been configured
/// with the `dbname` method.
pub fn get_dbname(&self) -> Option<&str> {
self.dbname.as_deref()
}
/// Sets command line options used to configure the server.
pub fn options(&mut self, options: impl Into<String>) -> &mut Config {
self.options = Some(options.into());
self
}
/// Gets the command line options used to configure the server, if the
/// options have been set with the `options` method.
pub fn get_options(&self) -> Option<&str> {
self.options.as_deref()
}
/// Sets the value of the `application_name` runtime parameter.
pub fn application_name(&mut self, application_name: impl Into<String>) -> &mut Config {
self.application_name = Some(application_name.into());
self
}
/// Gets the value of the `application_name` runtime parameter, if it has
/// been set with the `application_name` method.
pub fn get_application_name(&self) -> Option<&str> {
self.application_name.as_deref()
}
/// Sets the SSL configuration.
///
/// Defaults to `prefer`.
pub fn ssl_mode(&mut self, ssl_mode: SslMode) -> &mut Config {
self.ssl_mode = ssl_mode;
self
}
/// Gets the SSL configuration.
pub fn get_ssl_mode(&self) -> SslMode {
self.ssl_mode
}
/// Adds a host to the configuration.
///
/// Multiple hosts can be specified by calling this method multiple times, and each will be tried in order. On Unix
/// systems, a host starting with a `/` is interpreted as a path to a directory containing Unix domain sockets.
/// There must be either no hosts, or the same number of hosts as hostaddrs.
pub fn host(&mut self, host: impl Into<String>) -> &mut Config {
let host = host.into();
#[cfg(unix)]
{
if host.starts_with('/') {
return self.host_path(host);
}
}
self.host.push(Host::Tcp(host));
self
}
/// Gets the hosts that have been added to the configuration with `host`.
pub fn get_hosts(&self) -> &[Host] {
&self.host
}
/// Gets the hostaddrs that have been added to the configuration with `hostaddr`.
pub fn get_hostaddrs(&self) -> &[IpAddr] {
self.hostaddr.deref()
}
/// Adds a Unix socket host to the configuration.
///
/// Unlike `host`, this method allows non-UTF8 paths.
#[cfg(unix)]
pub fn host_path<T>(&mut self, host: T) -> &mut Config
where
T: AsRef<Path>,
{
self.host.push(Host::Unix(host.as_ref().to_path_buf()));
self
}
/// Adds a hostaddr to the configuration.
///
/// Multiple hostaddrs can be specified by calling this method multiple times, and each will be tried in order.
/// There must be either no hostaddrs, or the same number of hostaddrs as hosts.
pub fn hostaddr(&mut self, hostaddr: IpAddr) -> &mut Config {
self.hostaddr.push(hostaddr);
self
}
/// Adds a port to the configuration.
///
/// Multiple ports can be specified by calling this method multiple times. There must either be no ports, in which
/// case the default of 5432 is used, a single port, in which it is used for all hosts, or the same number of ports
/// as hosts.
pub fn port(&mut self, port: u16) -> &mut Config {
self.port.push(port);
self
}
/// Gets the ports that have been added to the configuration with `port`.
pub fn get_ports(&self) -> &[u16] {
&self.port
}
/// Sets the timeout applied to socket-level connection attempts.
///
/// Note that hostnames can resolve to multiple IP addresses, and this timeout will apply to each address of each
/// host separately. Defaults to no limit.
pub fn connect_timeout(&mut self, connect_timeout: Duration) -> &mut Config {
self.connect_timeout = Some(connect_timeout);
self
}
/// Gets the connection timeout, if one has been set with the
/// `connect_timeout` method.
pub fn get_connect_timeout(&self) -> Option<&Duration> {
self.connect_timeout.as_ref()
}
/// Sets the TCP user timeout.
///
/// This is ignored for Unix domain socket connections. It is only supported on systems where
/// TCP_USER_TIMEOUT is available and will default to the system default if omitted or set to 0;
/// on other systems, it has no effect.
pub fn tcp_user_timeout(&mut self, tcp_user_timeout: Duration) -> &mut Config {
self.tcp_user_timeout = Some(tcp_user_timeout);
self
}
/// Gets the TCP user timeout, if one has been set with the
/// `user_timeout` method.
pub fn get_tcp_user_timeout(&self) -> Option<&Duration> {
self.tcp_user_timeout.as_ref()
}
/// Controls the use of TCP keepalive.
///
/// This is ignored for Unix domain socket connections. Defaults to `true`.
pub fn keepalives(&mut self, keepalives: bool) -> &mut Config {
self.keepalives = keepalives;
self
}
/// Reports whether TCP keepalives will be used.
pub fn get_keepalives(&self) -> bool {
self.keepalives
}
/// Sets the amount of idle time before a keepalive packet is sent on the connection.
///
/// This is ignored for Unix domain sockets, or if the `keepalives` option is disabled. Defaults to 2 hours.
#[cfg(not(target_arch = "wasm32"))]
pub fn keepalives_idle(&mut self, keepalives_idle: Duration) -> &mut Config {
self.keepalive_config.idle = keepalives_idle;
self
}
/// Gets the configured amount of idle time before a keepalive packet will
/// be sent on the connection.
#[cfg(not(target_arch = "wasm32"))]
pub fn get_keepalives_idle(&self) -> Duration {
self.keepalive_config.idle
}
/// Sets the time interval between TCP keepalive probes.
/// On Windows, this sets the value of the tcp_keepalive struct’s keepaliveinterval field.
///
/// This is ignored for Unix domain sockets, or if the `keepalives` option is disabled.
#[cfg(not(target_arch = "wasm32"))]
pub fn keepalives_interval(&mut self, keepalives_interval: Duration) -> &mut Config {
self.keepalive_config.interval = Some(keepalives_interval);
self
}
/// Gets the time interval between TCP keepalive probes.
#[cfg(not(target_arch = "wasm32"))]
pub fn get_keepalives_interval(&self) -> Option<Duration> {
self.keepalive_config.interval
}
/// Sets the maximum number of TCP keepalive probes that will be sent before dropping a connection.
///
/// This is ignored for Unix domain sockets, or if the `keepalives` option is disabled.
#[cfg(not(target_arch = "wasm32"))]
pub fn keepalives_retries(&mut self, keepalives_retries: u32) -> &mut Config {
self.keepalive_config.retries = Some(keepalives_retries);
self
}
/// Gets the maximum number of TCP keepalive probes that will be sent before dropping a connection.
#[cfg(not(target_arch = "wasm32"))]
pub fn get_keepalives_retries(&self) -> Option<u32> {
self.keepalive_config.retries
}
/// Sets the requirements of the session.
///
/// This can be used to connect to the primary server in a clustered database rather than one of the read-only
/// secondary servers. Defaults to `Any`.
pub fn target_session_attrs(
&mut self,
target_session_attrs: TargetSessionAttrs,
) -> &mut Config {
self.target_session_attrs = target_session_attrs;
self
}
/// Gets the requirements of the session.
pub fn get_target_session_attrs(&self) -> TargetSessionAttrs {
self.target_session_attrs
}
/// Sets the channel binding behavior.
///
/// Defaults to `prefer`.
pub fn channel_binding(&mut self, channel_binding: ChannelBinding) -> &mut Config {
self.channel_binding = channel_binding;
self
}
/// Gets the channel binding behavior.
pub fn get_channel_binding(&self) -> ChannelBinding {
self.channel_binding
}
/// Sets the host load balancing behavior.
///
/// Defaults to `disable`.
pub fn load_balance_hosts(&mut self, load_balance_hosts: LoadBalanceHosts) -> &mut Config {
self.load_balance_hosts = load_balance_hosts;
self
}
/// Gets the host load balancing behavior.
pub fn get_load_balance_hosts(&self) -> LoadBalanceHosts {
self.load_balance_hosts
}
fn param(&mut self, key: &str, value: &str) -> Result<(), Error> {
match key {
"user" => {
self.user(value);
}
"password" => {
self.password(value);
}
"dbname" => {
self.dbname(value);
}
"options" => {
self.options(value);
}
"application_name" => {
self.application_name(value);
}
"sslmode" => {
let mode = match value {
"disable" => SslMode::Disable,
"prefer" => SslMode::Prefer,
"require" => SslMode::Require,
_ => return Err(Error::config_parse(Box::new(InvalidValue("sslmode")))),
};
self.ssl_mode(mode);
}
"host" => {
for host in value.split(',') {
self.host(host);
}
}
"hostaddr" => {
for hostaddr in value.split(',') {
let addr = hostaddr
.parse()
.map_err(|_| Error::config_parse(Box::new(InvalidValue("hostaddr"))))?;
self.hostaddr(addr);
}
}
"port" => {
for port in value.split(',') {
let port = if port.is_empty() {
5432
} else {
port.parse()
.map_err(|_| Error::config_parse(Box::new(InvalidValue("port"))))?
};
self.port(port);
}
}
"connect_timeout" => {
let timeout = value
.parse::<i64>()
.map_err(|_| Error::config_parse(Box::new(InvalidValue("connect_timeout"))))?;
if timeout > 0 {
self.connect_timeout(Duration::from_secs(timeout as u64));
}
}
"tcp_user_timeout" => {
let timeout = value
.parse::<i64>()
.map_err(|_| Error::config_parse(Box::new(InvalidValue("tcp_user_timeout"))))?;
if timeout > 0 {
self.tcp_user_timeout(Duration::from_secs(timeout as u64));
}
}
#[cfg(not(target_arch = "wasm32"))]
"keepalives" => {
let keepalives = value
.parse::<u64>()
.map_err(|_| Error::config_parse(Box::new(InvalidValue("keepalives"))))?;
self.keepalives(keepalives != 0);
}
#[cfg(not(target_arch = "wasm32"))]
"keepalives_idle" => {
let keepalives_idle = value
.parse::<i64>()
.map_err(|_| Error::config_parse(Box::new(InvalidValue("keepalives_idle"))))?;
if keepalives_idle > 0 {
self.keepalives_idle(Duration::from_secs(keepalives_idle as u64));
}
}
#[cfg(not(target_arch = "wasm32"))]
"keepalives_interval" => {
let keepalives_interval = value.parse::<i64>().map_err(|_| {
Error::config_parse(Box::new(InvalidValue("keepalives_interval")))
})?;
if keepalives_interval > 0 {
self.keepalives_interval(Duration::from_secs(keepalives_interval as u64));
}
}
#[cfg(not(target_arch = "wasm32"))]
"keepalives_retries" => {
let keepalives_retries = value.parse::<u32>().map_err(|_| {
Error::config_parse(Box::new(InvalidValue("keepalives_retries")))
})?;
self.keepalives_retries(keepalives_retries);
}
"target_session_attrs" => {
let target_session_attrs = match value {
"any" => TargetSessionAttrs::Any,
"read-write" => TargetSessionAttrs::ReadWrite,
"read-only" => TargetSessionAttrs::ReadOnly,
_ => {
return Err(Error::config_parse(Box::new(InvalidValue(
"target_session_attrs",
))));
}
};
self.target_session_attrs(target_session_attrs);
}
"channel_binding" => {
let channel_binding = match value {
"disable" => ChannelBinding::Disable,
"prefer" => ChannelBinding::Prefer,
"require" => ChannelBinding::Require,
_ => {
return Err(Error::config_parse(Box::new(InvalidValue(
"channel_binding",
))))
}
};
self.channel_binding(channel_binding);
}
"load_balance_hosts" => {
let load_balance_hosts = match value {
"disable" => LoadBalanceHosts::Disable,
"random" => LoadBalanceHosts::Random,
_ => {
return Err(Error::config_parse(Box::new(InvalidValue(
"load_balance_hosts",
))))
}
};
self.load_balance_hosts(load_balance_hosts);
}
key => {
return Err(Error::config_parse(Box::new(UnknownOption(
key.to_string(),
))));
}
}
Ok(())
}
/// Opens a connection to a PostgreSQL database.
///
/// Requires the `runtime` Cargo feature (enabled by default).
#[cfg(feature = "runtime")]
pub async fn connect<T>(&self, tls: T) -> Result<(Client, Connection<Socket, T::Stream>), Error>
where
T: MakeTlsConnect<Socket>,
{
connect(tls, self).await
}
/// Connects to a PostgreSQL database over an arbitrary stream.
///
/// All of the settings other than `user`, `password`, `dbname`, `options`, and `application_name` name are ignored.
pub async fn connect_raw<S, T>(
&self,
stream: S,
tls: T,
) -> Result<(Client, Connection<S, T::Stream>), Error>
where
S: AsyncRead + AsyncWrite + Unpin,
T: TlsConnect<S>,
{
connect_raw(stream, tls, true, self).await
}
}
impl FromStr for Config {
type Err = Error;
fn from_str(s: &str) -> Result<Config, Error> {
match UrlParser::parse(s)? {
Some(config) => Ok(config),
None => Parser::parse(s),
}
}
}
// Omit password from debug output
impl fmt::Debug for Config {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
struct Redaction {}
impl fmt::Debug for Redaction {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "_")
}
}
let mut config_dbg = &mut f.debug_struct("Config");
config_dbg = config_dbg
.field("user", &self.user)
.field("password", &self.password.as_ref().map(|_| Redaction {}))
.field("dbname", &self.dbname)
.field("options", &self.options)
.field("application_name", &self.application_name)
.field("ssl_mode", &self.ssl_mode)
.field("host", &self.host)
.field("hostaddr", &self.hostaddr)
.field("port", &self.port)
.field("connect_timeout", &self.connect_timeout)
.field("tcp_user_timeout", &self.tcp_user_timeout)
.field("keepalives", &self.keepalives);
#[cfg(not(target_arch = "wasm32"))]
{
config_dbg = config_dbg
.field("keepalives_idle", &self.keepalive_config.idle)
.field("keepalives_interval", &self.keepalive_config.interval)
.field("keepalives_retries", &self.keepalive_config.retries);
}
config_dbg
.field("target_session_attrs", &self.target_session_attrs)
.field("channel_binding", &self.channel_binding)
.finish()
}
}
#[derive(Debug)]
struct UnknownOption(String);
impl fmt::Display for UnknownOption {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(fmt, "unknown option `{}`", self.0)
}
}
impl error::Error for UnknownOption {}
#[derive(Debug)]
struct InvalidValue(&'static str);
impl fmt::Display for InvalidValue {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(fmt, "invalid value for option `{}`", self.0)
}
}
impl error::Error for InvalidValue {}
struct Parser<'a> {
s: &'a str,
it: iter::Peekable<str::CharIndices<'a>>,
}
impl<'a> Parser<'a> {
fn parse(s: &'a str) -> Result<Config, Error> {
let mut parser = Parser {
s,
it: s.char_indices().peekable(),
};
let mut config = Config::new();
while let Some((key, value)) = parser.parameter()? {
config.param(key, &value)?;
}
Ok(config)
}
fn skip_ws(&mut self) {
self.take_while(char::is_whitespace);
}
fn take_while<F>(&mut self, f: F) -> &'a str
where
F: Fn(char) -> bool,
{
let start = match self.it.peek() {
Some(&(i, _)) => i,
None => return "",
};
loop {
match self.it.peek() {
Some(&(_, c)) if f(c) => {
self.it.next();
}
Some(&(i, _)) => return &self.s[start..i],
None => return &self.s[start..],
}
}
}
fn eat(&mut self, target: char) -> Result<(), Error> {
match self.it.next() {
Some((_, c)) if c == target => Ok(()),
Some((i, c)) => {
let m = format!(
"unexpected character at byte {}: expected `{}` but got `{}`",
i, target, c
);
Err(Error::config_parse(m.into()))
}
None => Err(Error::config_parse("unexpected EOF".into())),
}
}
fn eat_if(&mut self, target: char) -> bool {
match self.it.peek() {
Some(&(_, c)) if c == target => {
self.it.next();
true
}
_ => false,
}
}
fn keyword(&mut self) -> Option<&'a str> {
let s = self.take_while(|c| match c {
c if c.is_whitespace() => false,
'=' => false,
_ => true,
});
if s.is_empty() {
None
} else {
Some(s)
}
}
fn value(&mut self) -> Result<String, Error> {
let value = if self.eat_if('\'') {
let value = self.quoted_value()?;
self.eat('\'')?;
value
} else {
self.simple_value()?
};
Ok(value)
}
fn simple_value(&mut self) -> Result<String, Error> {
let mut value = String::new();
while let Some(&(_, c)) = self.it.peek() {
if c.is_whitespace() {
break;
}
self.it.next();
if c == '\\' {
if let Some((_, c2)) = self.it.next() {
value.push(c2);
}
} else {
value.push(c);
}
}
if value.is_empty() {
return Err(Error::config_parse("unexpected EOF".into()));
}
Ok(value)
}
fn quoted_value(&mut self) -> Result<String, Error> {
let mut value = String::new();
while let Some(&(_, c)) = self.it.peek() {
if c == '\'' {
return Ok(value);
}
self.it.next();
if c == '\\' {
if let Some((_, c2)) = self.it.next() {
value.push(c2);
}
} else {
value.push(c);
}
}
Err(Error::config_parse(
"unterminated quoted connection parameter value".into(),
))
}
fn parameter(&mut self) -> Result<Option<(&'a str, String)>, Error> {
self.skip_ws();
let keyword = match self.keyword() {
Some(keyword) => keyword,
None => return Ok(None),
};
self.skip_ws();
self.eat('=')?;
self.skip_ws();
let value = self.value()?;
Ok(Some((keyword, value)))
}
}
// This is a pretty sloppy "URL" parser, but it matches the behavior of libpq, where things really aren't very strict
struct UrlParser<'a> {
s: &'a str,
config: Config,
}
impl<'a> UrlParser<'a> {
fn parse(s: &'a str) -> Result<Option<Config>, Error> {
let s = match Self::remove_url_prefix(s) {
Some(s) => s,
None => return Ok(None),
};
let mut parser = UrlParser {
s,
config: Config::new(),
};
parser.parse_credentials()?;
parser.parse_host()?;
parser.parse_path()?;
parser.parse_params()?;
Ok(Some(parser.config))
}
fn remove_url_prefix(s: &str) -> Option<&str> {
for prefix in &["postgres://", "postgresql://"] {
if let Some(stripped) = s.strip_prefix(prefix) {
return Some(stripped);
}
}
None
}
fn take_until(&mut self, end: &[char]) -> Option<&'a str> {
match self.s.find(end) {
Some(pos) => {
let (head, tail) = self.s.split_at(pos);
self.s = tail;
Some(head)
}
None => None,
}
}
fn take_all(&mut self) -> &'a str {
mem::take(&mut self.s)
}
fn eat_byte(&mut self) {
self.s = &self.s[1..];
}
fn parse_credentials(&mut self) -> Result<(), Error> {
let creds = match self.take_until(&['@']) {
Some(creds) => creds,
None => return Ok(()),
};
self.eat_byte();
let mut it = creds.splitn(2, ':');
let user = self.decode(it.next().unwrap())?;
self.config.user(user);
if let Some(password) = it.next() {
let password = Cow::from(percent_encoding::percent_decode(password.as_bytes()));
self.config.password(password);
}
Ok(())
}
fn parse_host(&mut self) -> Result<(), Error> {
let host = match self.take_until(&['/', '?']) {
Some(host) => host,
None => self.take_all(),
};
if host.is_empty() {
return Ok(());
}
for chunk in host.split(',') {
let (host, port) = if chunk.starts_with('[') {
let idx = match chunk.find(']') {
Some(idx) => idx,
None => return Err(Error::config_parse(InvalidValue("host").into())),
};
let host = &chunk[1..idx];
let remaining = &chunk[idx + 1..];
let port = if let Some(port) = remaining.strip_prefix(':') {
Some(port)
} else if remaining.is_empty() {
None
} else {
return Err(Error::config_parse(InvalidValue("host").into()));
};
(host, port)
} else {
let mut it = chunk.splitn(2, ':');
(it.next().unwrap(), it.next())
};
self.host_param(host)?;
let port = self.decode(port.unwrap_or("5432"))?;
self.config.param("port", &port)?;
}
Ok(())
}
fn parse_path(&mut self) -> Result<(), Error> {
if !self.s.starts_with('/') {
return Ok(());
}
self.eat_byte();
let dbname = match self.take_until(&['?']) {
Some(dbname) => dbname,
None => self.take_all(),
};
if !dbname.is_empty() {
self.config.dbname(self.decode(dbname)?);
}
Ok(())
}
fn parse_params(&mut self) -> Result<(), Error> {
if !self.s.starts_with('?') {
return Ok(());
}
self.eat_byte();
while !self.s.is_empty() {
let key = match self.take_until(&['=']) {
Some(key) => self.decode(key)?,
None => return Err(Error::config_parse("unterminated parameter".into())),
};
self.eat_byte();
let value = match self.take_until(&['&']) {
Some(value) => {
self.eat_byte();
value
}
None => self.take_all(),
};
if key == "host" {
self.host_param(value)?;
} else {
let value = self.decode(value)?;
self.config.param(&key, &value)?;
}
}
Ok(())
}
#[cfg(unix)]
fn host_param(&mut self, s: &str) -> Result<(), Error> {
let decoded = Cow::from(percent_encoding::percent_decode(s.as_bytes()));
if decoded.first() == Some(&b'/') {
self.config.host_path(OsStr::from_bytes(&decoded));
} else {
let decoded = str::from_utf8(&decoded).map_err(|e| Error::config_parse(Box::new(e)))?;
self.config.host(decoded);
}
Ok(())
}
#[cfg(not(unix))]
fn host_param(&mut self, s: &str) -> Result<(), Error> {
let s = self.decode(s)?;
self.config.param("host", &s)
}
fn decode(&self, s: &'a str) -> Result<Cow<'a, str>, Error> {
percent_encoding::percent_decode(s.as_bytes())
.decode_utf8()
.map_err(|e| Error::config_parse(e.into()))
}
}
#[cfg(test)]
mod tests {
use std::net::IpAddr;
use crate::{config::Host, Config};
#[test]
fn test_simple_parsing() {
let s = "user=pass_user dbname=postgres host=host1,host2 hostaddr=127.0.0.1,127.0.0.2 port=26257";
let config = s.parse::<Config>().unwrap();
assert_eq!(Some("pass_user"), config.get_user());
assert_eq!(Some("postgres"), config.get_dbname());
assert_eq!(
[
Host::Tcp("host1".to_string()),
Host::Tcp("host2".to_string())
],
config.get_hosts(),
);
assert_eq!(
[
"127.0.0.1".parse::<IpAddr>().unwrap(),
"127.0.0.2".parse::<IpAddr>().unwrap()
],
config.get_hostaddrs(),
);
assert_eq!(1, 1);
}
#[test]
fn test_invalid_hostaddr_parsing() {
let s = "user=pass_user dbname=postgres host=host1 hostaddr=127.0.0 port=26257";
s.parse::<Config>().err().unwrap();
}
}