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Steven Fackler 2017-03-12 13:44:27 -07:00
parent 33d45db60f
commit 6df3842274
15 changed files with 2308 additions and 4 deletions
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Cargo.toml
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[workspace] [workspace]
members = ["codegen", "postgres", "postgres-shared", "tokio-postgres"] members = [
"codegen",
"postgres",
"postgres-protocol",
"postgres-shared",
"tokio-postgres"
]

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postgres-protocol/.gitignore vendored Normal file
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target
Cargo.lock
.idea/
*.iml

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language: rust
cache: cargo
rust:
- nightly
- 1.10.0
script:
- cargo test

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postgres-protocol/Cargo.toml Normal file
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[package]
name = "postgres-protocol"
version = "0.2.1"
authors = ["Steven Fackler <sfackler@gmail.com>"]
description = "Low level Postgres protocol APIs"
license = "MIT/Apache-2.0"
repository = "https://github.com/sfackler/rust-postgres-protocol"
documentation = "https://docs.rs/postgres-protocol/0.2.1/postgres_protocol"
readme = "README.md"
[dependencies]
byteorder = "1.0"
fallible-iterator = "0.1"
md5 = "0.3"
memchr = "1.0"

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Apache License
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postgres-protocol/LICENSE-MIT Normal file
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The MIT License (MIT)
Copyright (c) 2016 Steven Fackler
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in all
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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//! Authentication protocol support.
use md5::Context;
/// Hashes authentication information in a way suitable for use in response
/// to an `AuthenticationMd5Password` message.
///
/// The resulting string should be sent back to the database in a
/// `PasswordMessage` message.
#[inline]
pub fn md5_hash(username: &[u8], password: &[u8], salt: [u8; 4]) -> String {
let mut context = Context::new();
context.consume(password);
context.consume(username);
let output = context.compute();
context = Context::new();
context.consume(format!("{:x}", output));
context.consume(&salt);
format!("md5{:x}", context.compute())
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn md5() {
let username = b"md5_user";
let password = b"password";
let salt = [0x2a, 0x3d, 0x8f, 0xe0];
assert_eq!(md5_hash(username, password, salt),
"md562af4dd09bbb41884907a838a3233294");
}
}

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//! Low level Postgres protocol APIs.
//!
//! This crate implements the low level components of Postgres's communication
//! protocol, including message and value serialization and deserialization.
//! It is designed to be used as a building block by higher level APIs such as
//! `rust-postgres`, and should not typically be used directly.
//!
//! # Note
//!
//! This library assumes that the `client_encoding` backend parameter has been
//! set to `UTF8`. It will most likely not behave properly if that is not the case.
#![doc(html_root_url="https://docs.rs/postgres-protocol/0.2.1")]
#![warn(missing_docs)]
extern crate byteorder;
extern crate fallible_iterator;
extern crate md5;
extern crate memchr;
use byteorder::{BigEndian, ByteOrder};
use std::io;
pub mod authentication;
pub mod message;
pub mod types;
/// A Postgres OID.
pub type Oid = u32;
/// An enum indicating if a value is `NULL` or not.
pub enum IsNull {
/// The value is `NULL`.
Yes,
/// The value is not `NULL`.
No,
}
#[inline]
fn write_nullable<F, E>(serializer: F, buf: &mut Vec<u8>) -> Result<(), E>
where F: FnOnce(&mut Vec<u8>) -> Result<IsNull, E>,
E: From<io::Error>
{
let base = buf.len();
buf.extend_from_slice(&[0; 4]);
let size = match try!(serializer(buf)) {
IsNull::No => try!(i32::from_usize(buf.len() - base - 4)),
IsNull::Yes => -1,
};
BigEndian::write_i32(&mut buf[base..], size);
Ok(())
}
trait FromUsize: Sized {
fn from_usize(x: usize) -> Result<Self, io::Error>;
}
macro_rules! from_usize {
($t:ty) => {
impl FromUsize for $t {
#[inline]
fn from_usize(x: usize) -> io::Result<$t> {
if x > <$t>::max_value() as usize {
Err(io::Error::new(io::ErrorKind::InvalidInput, "value too large to transmit"))
} else {
Ok(x as $t)
}
}
}
}
}
from_usize!(i16);
from_usize!(i32);

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#![allow(missing_docs)]
use byteorder::{ReadBytesExt, BigEndian};
use memchr::memchr;
use fallible_iterator::FallibleIterator;
use std::io::{self, Read};
use std::marker::PhantomData;
use std::ops::Deref;
use std::str;
use Oid;
/// An enum representing Postgres backend messages.
pub enum Message<T> {
AuthenticationCleartextPassword,
AuthenticationGss,
AuthenticationKerberosV5,
AuthenticationMd5Password(AuthenticationMd5PasswordBody<T>),
AuthenticationOk,
AuthenticationScmCredential,
AuthenticationSspi,
BackendKeyData(BackendKeyDataBody<T>),
BindComplete,
CloseComplete,
CommandComplete(CommandCompleteBody<T>),
CopyData(CopyDataBody<T>),
CopyDone,
CopyInResponse(CopyInResponseBody<T>),
CopyOutResponse(CopyOutResponseBody<T>),
DataRow(DataRowBody<T>),
EmptyQueryResponse,
ErrorResponse(ErrorResponseBody<T>),
NoData,
NoticeResponse(NoticeResponseBody<T>),
NotificationResponse(NotificationResponseBody<T>),
ParameterDescription(ParameterDescriptionBody<T>),
ParameterStatus(ParameterStatusBody<T>),
ParseComplete,
PortalSuspended,
ReadyForQuery(ReadyForQueryBody<T>),
RowDescription(RowDescriptionBody<T>),
#[doc(hidden)]
__ForExtensibility,
}
impl<'a> Message<&'a [u8]> {
/// Attempts to parse a backend message from the buffer.
///
/// This method is unfortunately difficult to use due to deficiencies in the compiler's borrow
/// checker.
#[inline]
pub fn parse(buf: &'a [u8]) -> io::Result<ParseResult<&'a [u8]>> {
Message::parse_inner(buf)
}
}
impl Message<Vec<u8>> {
/// Attempts to parse a backend message from the buffer.
///
/// In contrast to `parse`, this method produces messages that do not reference the input,
/// buffer by copying any necessary portions internally.
#[inline]
pub fn parse_owned(buf: &[u8]) -> io::Result<ParseResult<Vec<u8>>> {
Message::parse_inner(buf)
}
}
impl<'a, T> Message<T>
where T: From<&'a [u8]>
{
#[inline]
fn parse_inner(buf: &'a [u8]) -> io::Result<ParseResult<T>> {
if buf.len() < 5 {
return Ok(ParseResult::Incomplete { required_size: None });
}
let mut r = buf;
let tag = r.read_u8().unwrap();
// add a byte for the tag
let len = r.read_u32::<BigEndian>().unwrap() as usize + 1;
if buf.len() < len {
return Ok(ParseResult::Incomplete { required_size: Some(len) });
}
let mut buf = &buf[5..len];
let message = match tag {
b'1' => Message::ParseComplete,
b'2' => Message::BindComplete,
b'3' => Message::CloseComplete,
b'A' => {
let process_id = try!(buf.read_i32::<BigEndian>());
let channel_end = try!(find_null(buf, 0));
let message_end = try!(find_null(buf, channel_end + 1));
let storage = buf[..message_end].into();
buf = &buf[message_end + 1..];
Message::NotificationResponse(NotificationResponseBody {
storage: storage,
process_id: process_id,
channel_end: channel_end,
})
}
b'c' => Message::CopyDone,
b'C' => {
let tag_end = try!(find_null(buf, 0));
let storage = buf[..tag_end].into();
buf = &buf[tag_end + 1..];
Message::CommandComplete(CommandCompleteBody {
storage: storage,
})
}
b'd' => {
let storage = buf.into();
buf = &[];
Message::CopyData(CopyDataBody { storage: storage })
}
b'D' => {
let len = try!(buf.read_u16::<BigEndian>());
let storage = buf.into();
buf = &[];
Message::DataRow(DataRowBody {
storage: storage,
len: len,
})
}
b'E' => {
let storage = buf.into();
buf = &[];
Message::ErrorResponse(ErrorResponseBody { storage: storage })
}
b'G' => {
let format = try!(buf.read_u8());
let len = try!(buf.read_u16::<BigEndian>());
let storage = buf.into();
buf = &[];
Message::CopyInResponse(CopyInResponseBody {
format: format,
len: len,
storage: storage,
})
}
b'H' => {
let format = try!(buf.read_u8());
let len = try!(buf.read_u16::<BigEndian>());
let storage = buf.into();
buf = &[];
Message::CopyOutResponse(CopyOutResponseBody {
format: format,
len: len,
storage: storage,
})
}
b'I' => Message::EmptyQueryResponse,
b'K' => {
let process_id = try!(buf.read_i32::<BigEndian>());
let secret_key = try!(buf.read_i32::<BigEndian>());
Message::BackendKeyData(BackendKeyDataBody {
process_id: process_id,
secret_key: secret_key,
_p: PhantomData,
})
}
b'n' => Message::NoData,
b'N' => {
let storage = buf.into();
buf = &[];
Message::NoticeResponse(NoticeResponseBody {
storage: storage,
})
}
b'R' => {
match try!(buf.read_i32::<BigEndian>()) {
0 => Message::AuthenticationOk,
2 => Message::AuthenticationKerberosV5,
3 => Message::AuthenticationCleartextPassword,
5 => {
let mut salt = [0; 4];
try!(buf.read_exact(&mut salt));
Message::AuthenticationMd5Password(AuthenticationMd5PasswordBody {
salt: salt,
_p: PhantomData,
})
}
6 => Message::AuthenticationScmCredential,
7 => Message::AuthenticationGss,
9 => Message::AuthenticationSspi,
tag => {
return Err(io::Error::new(io::ErrorKind::InvalidInput,
format!("unknown authentication tag `{}`", tag)));
}
}
}
b's' => Message::PortalSuspended,
b'S' => {
let name_end = try!(find_null(buf, 0));
let value_end = try!(find_null(buf, name_end + 1));
let storage = buf[0..value_end].into();
buf = &buf[value_end + 1..];
Message::ParameterStatus(ParameterStatusBody {
storage: storage,
name_end: name_end,
})
}
b't' => {
let len = try!(buf.read_u16::<BigEndian>());
let storage = buf.into();
buf = &[];
Message::ParameterDescription(ParameterDescriptionBody {
storage: storage,
len: len,
})
}
b'T' => {
let len = try!(buf.read_u16::<BigEndian>());
let storage = buf.into();
buf = &[];
Message::RowDescription(RowDescriptionBody {
storage: storage,
len: len,
})
}
b'Z' => {
let status = try!(buf.read_u8());
Message::ReadyForQuery(ReadyForQueryBody {
status: status,
_p: PhantomData,
})
}
tag => {
return Err(io::Error::new(io::ErrorKind::InvalidInput,
format!("unknown message tag `{}`", tag)));
}
};
if !buf.is_empty() {
return Err(io::Error::new(io::ErrorKind::InvalidInput, "invalid message length"));
}
Ok(ParseResult::Complete {
message: message,
consumed: len,
})
}
}
/// The result of an attempted parse.
pub enum ParseResult<T> {
/// The message was successfully parsed.
Complete {
/// The message.
message: Message<T>,
/// The number of bytes of the input buffer consumed to parse this message.
consumed: usize,
},
/// The buffer did not contain a full message.
Incomplete {
/// The number of total bytes required to parse a message, if known.
///
/// This value is present if the input buffer contains at least 5 bytes.
required_size: Option<usize>,
}
}
pub struct AuthenticationMd5PasswordBody<T> {
salt: [u8; 4],
_p: PhantomData<T>,
}
impl<T> AuthenticationMd5PasswordBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn salt(&self) -> [u8; 4] {
self.salt
}
}
pub struct BackendKeyDataBody<T> {
process_id: i32,
secret_key: i32,
_p: PhantomData<T>,
}
impl<T> BackendKeyDataBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn process_id(&self) -> i32 {
self.process_id
}
#[inline]
pub fn secret_key(&self) -> i32 {
self.secret_key
}
}
pub struct CommandCompleteBody<T> {
storage: T,
}
impl<T> CommandCompleteBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn tag(&self) -> io::Result<&str> {
get_str(&self.storage)
}
}
pub struct CopyDataBody<T> {
storage: T,
}
impl<T> CopyDataBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn data(&self) -> &[u8] {
&self.storage
}
}
pub struct CopyInResponseBody<T> {
storage: T,
len: u16,
format: u8,
}
impl<T> CopyInResponseBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn format(&self) -> u8 {
self.format
}
#[inline]
pub fn column_formats<'a>(&'a self) -> ColumnFormats<'a> {
ColumnFormats {
remaining: self.len,
buf: &self.storage,
}
}
}
pub struct ColumnFormats<'a> {
buf: &'a [u8],
remaining: u16,
}
impl<'a> FallibleIterator for ColumnFormats<'a> {
type Item = u16;
type Error = io::Error;
#[inline]
fn next(&mut self) -> io::Result<Option<u16>> {
if self.remaining == 0 {
if self.buf.is_empty() {
return Ok(None);
} else {
return Err(io::Error::new(io::ErrorKind::InvalidInput, "invalid message length"));
}
}
self.remaining -= 1;
self.buf.read_u16::<BigEndian>().map(Some)
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let len = self.remaining as usize;
(len, Some(len))
}
}
pub struct CopyOutResponseBody<T> {
storage: T,
len: u16,
format: u8,
}
impl<T> CopyOutResponseBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn format(&self) -> u8 {
self.format
}
#[inline]
pub fn column_formats<'a>(&'a self) -> ColumnFormats<'a> {
ColumnFormats {
remaining: self.len,
buf: &self.storage,
}
}
}
pub struct DataRowBody<T> {
storage: T,
len: u16,
}
impl<T> DataRowBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn values<'a>(&'a self) -> DataRowValues<'a> {
DataRowValues {
buf: &self.storage,
remaining: self.len,
}
}
}
pub struct DataRowValues<'a> {
buf: &'a [u8],
remaining: u16,
}
impl<'a> FallibleIterator for DataRowValues<'a> {
type Item = Option<&'a [u8]>;
type Error = io::Error;
#[inline]
fn next(&mut self) -> io::Result<Option<Option<&'a [u8]>>> {
if self.remaining == 0 {
if self.buf.is_empty() {
return Ok(None);
} else {
return Err(io::Error::new(io::ErrorKind::InvalidInput, "invalid message length"));
}
}
self.remaining -= 1;
let len = try!(self.buf.read_i32::<BigEndian>());
if len < 0 {
Ok(Some(None))
} else {
let len = len as usize;
if self.buf.len() < len {
return Err(io::Error::new(io::ErrorKind::UnexpectedEof, "unexpected EOF"));
}
let (head, tail) = self.buf.split_at(len);
self.buf = tail;
Ok(Some(Some(head)))
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let len = self.remaining as usize;
(len, Some(len))
}
}
pub struct ErrorResponseBody<T> {
storage: T,
}
impl<T> ErrorResponseBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn fields<'a>(&'a self) -> ErrorFields<'a> {
ErrorFields {
buf: &self.storage
}
}
}
pub struct ErrorFields<'a> {
buf: &'a [u8],
}
impl<'a> FallibleIterator for ErrorFields<'a> {
type Item = ErrorField<'a>;
type Error = io::Error;
#[inline]
fn next(&mut self) -> io::Result<Option<ErrorField<'a>>> {
let type_ = try!(self.buf.read_u8());
if type_ == 0 {
if self.buf.is_empty() {
return Ok(None);
} else {
return Err(io::Error::new(io::ErrorKind::InvalidInput, "invalid message length"));
}
}
let value_end = try!(find_null(self.buf, 0));
let value = try!(get_str(&self.buf[..value_end]));
self.buf = &self.buf[value_end + 1..];
Ok(Some(ErrorField {
type_: type_,
value: value,
}))
}
}
pub struct ErrorField<'a> {
type_: u8,
value: &'a str,
}
impl<'a> ErrorField<'a> {
#[inline]
pub fn type_(&self) -> u8 {
self.type_
}
#[inline]
pub fn value(&self) -> &str {
self.value
}
}
pub struct NoticeResponseBody<T> {
storage: T,
}
impl<T> NoticeResponseBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn fields<'a>(&'a self) -> ErrorFields<'a> {
ErrorFields {
buf: &self.storage
}
}
}
pub struct NotificationResponseBody<T> {
storage: T,
process_id: i32,
channel_end: usize,
}
impl<T> NotificationResponseBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn process_id(&self) -> i32 {
self.process_id
}
#[inline]
pub fn channel(&self) -> io::Result<&str> {
get_str(&self.storage[..self.channel_end])
}
#[inline]
pub fn message(&self) -> io::Result<&str> {
get_str(&self.storage[self.channel_end + 1..])
}
}
pub struct ParameterDescriptionBody<T> {
storage: T,
len: u16,
}
impl<T> ParameterDescriptionBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn parameters<'a>(&'a self) -> Parameters<'a> {
Parameters {
buf: &self.storage,
remaining: self.len,
}
}
}
pub struct Parameters<'a> {
buf: &'a [u8],
remaining: u16,
}
impl<'a> FallibleIterator for Parameters<'a> {
type Item = Oid;
type Error = io::Error;
#[inline]
fn next(&mut self) -> io::Result<Option<Oid>> {
if self.remaining == 0 {
if self.buf.is_empty() {
return Ok(None);
} else {
return Err(io::Error::new(io::ErrorKind::InvalidInput, "invalid message length"));
}
}
self.remaining -= 1;
self.buf.read_u32::<BigEndian>().map(Some)
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let len = self.remaining as usize;
(len, Some(len))
}
}
pub struct ParameterStatusBody<T> {
storage: T,
name_end: usize,
}
impl<T> ParameterStatusBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn name(&self) -> io::Result<&str> {
get_str(&self.storage[..self.name_end])
}
#[inline]
pub fn value(&self) -> io::Result<&str> {
get_str(&self.storage[self.name_end + 1..])
}
}
pub struct ReadyForQueryBody<T> {
status: u8,
_p: PhantomData<T>,
}
impl<T> ReadyForQueryBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn status(&self) -> u8 {
self.status
}
}
pub struct RowDescriptionBody<T> {
storage: T,
len: u16,
}
impl<T> RowDescriptionBody<T>
where T: Deref<Target = [u8]>
{
#[inline]
pub fn fields<'a>(&'a self) -> Fields<'a> {
Fields {
buf: &self.storage,
remaining: self.len,
}
}
}
pub struct Fields<'a> {
buf: &'a [u8],
remaining: u16,
}
impl<'a> FallibleIterator for Fields<'a> {
type Item = Field<'a>;
type Error = io::Error;
#[inline]
fn next(&mut self) -> io::Result<Option<Field<'a>>> {
if self.remaining == 0 {
if self.buf.is_empty() {
return Ok(None);
} else {
return Err(io::Error::new(io::ErrorKind::InvalidInput, "invalid message length"));
}
}
self.remaining -= 1;
let name_end = try!(find_null(self.buf, 0));
let name = try!(get_str(&self.buf[..name_end]));
self.buf = &self.buf[name_end + 1..];
let table_oid = try!(self.buf.read_u32::<BigEndian>());
let column_id = try!(self.buf.read_i16::<BigEndian>());
let type_oid = try!(self.buf.read_u32::<BigEndian>());
let type_size = try!(self.buf.read_i16::<BigEndian>());
let type_modifier = try!(self.buf.read_i32::<BigEndian>());
let format = try!(self.buf.read_i16::<BigEndian>());
Ok(Some(Field {
name: name,
table_oid: table_oid,
column_id: column_id,
type_oid: type_oid,
type_size: type_size,
type_modifier: type_modifier,
format: format,
}))
}
}
pub struct Field<'a> {
name: &'a str,
table_oid: Oid,
column_id: i16,
type_oid: Oid,
type_size: i16,
type_modifier: i32,
format: i16,
}
impl<'a> Field<'a> {
#[inline]
pub fn name(&self) -> &'a str {
self.name
}
#[inline]
pub fn table_oid(&self) -> Oid {
self.table_oid
}
#[inline]
pub fn column_id(&self) -> i16 {
self.column_id
}
#[inline]
pub fn type_oid(&self) -> Oid {
self.type_oid
}
#[inline]
pub fn type_size(&self) -> i16 {
self.type_size
}
#[inline]
pub fn type_modifier(&self) -> i32 {
self.type_modifier
}
#[inline]
pub fn format(&self) -> i16 {
self.format
}
}
#[inline]
fn find_null(buf: &[u8], start: usize) -> io::Result<usize> {
match memchr(0, &buf[start..]) {
Some(pos) => Ok(pos + start),
None => Err(io::Error::new(io::ErrorKind::UnexpectedEof, "unexpected EOF"))
}
}
#[inline]
fn get_str(buf: &[u8]) -> io::Result<&str> {
str::from_utf8(buf).map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))
}

327
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//! Frontend message serialization.
#![allow(missing_docs)]
use byteorder::{WriteBytesExt, BigEndian, ByteOrder};
use std::error::Error;
use std::io;
use std::marker;
use {Oid, FromUsize, IsNull, write_nullable};
pub enum Message<'a> {
Bind {
portal: &'a str,
statement: &'a str,
formats: &'a [i16],
values: &'a [Option<Vec<u8>>],
result_formats: &'a [i16],
},
CancelRequest {
process_id: i32,
secret_key: i32,
},
Close {
variant: u8,
name: &'a str,
},
CopyData {
data: &'a [u8],
},
CopyDone,
CopyFail {
message: &'a str,
},
Describe {
variant: u8,
name: &'a str,
},
Execute {
portal: &'a str,
max_rows: i32,
},
Parse {
name: &'a str,
query: &'a str,
param_types: &'a [Oid],
},
PasswordMessage {
password: &'a str,
},
Query {
query: &'a str,
},
SslRequest,
StartupMessage {
parameters: &'a [(String, String)],
},
Sync,
Terminate,
#[doc(hidden)]
__ForExtensibility,
}
impl<'a> Message<'a> {
#[inline]
pub fn serialize(&self, buf: &mut Vec<u8>) -> io::Result<()> {
match *self {
Message::Bind { portal, statement, formats, values, result_formats } => {
let r = bind(portal,
statement,
formats.iter().cloned(),
values,
|v, buf| {
match *v {
Some(ref v) => {
buf.extend_from_slice(v);
Ok(IsNull::No)
}
None => Ok(IsNull::Yes),
}
},
result_formats.iter().cloned(),
buf);
match r {
Ok(()) => Ok(()),
Err(BindError::Conversion(_)) => unreachable!(),
Err(BindError::Serialization(e)) => Err(e),
}
}
Message::CancelRequest { process_id, secret_key } => {
Ok(cancel_request(process_id, secret_key, buf))
}
Message::Close { variant, name } => close(variant, name, buf),
Message::CopyData { data } => copy_data(data, buf),
Message::CopyDone => Ok(copy_done(buf)),
Message::CopyFail { message } => copy_fail(message, buf),
Message::Describe { variant, name } => describe(variant, name, buf),
Message::Execute { portal, max_rows } => execute(portal, max_rows, buf),
Message::Parse { name, query, param_types } => {
parse(name, query, param_types.iter().cloned(), buf)
}
Message::PasswordMessage { password } => password_message(password, buf),
Message::Query { query: q } => query(q, buf),
Message::SslRequest => Ok(ssl_request(buf)),
Message::StartupMessage { parameters } => {
startup_message(parameters.iter().map(|&(ref k, ref v)| (&**k, &**v)), buf)
}
Message::Sync => Ok(sync(buf)),
Message::Terminate => Ok(terminate(buf)),
Message::__ForExtensibility => unreachable!(),
}
}
}
#[inline]
fn write_body<F, E>(buf: &mut Vec<u8>, f: F) -> Result<(), E>
where F: FnOnce(&mut Vec<u8>) -> Result<(), E>,
E: From<io::Error>
{
let base = buf.len();
buf.extend_from_slice(&[0; 4]);
try!(f(buf));
let size = try!(i32::from_usize(buf.len() - base));
BigEndian::write_i32(&mut buf[base..], size);
Ok(())
}
pub enum BindError {
Conversion(Box<Error + marker::Sync + Send>),
Serialization(io::Error),
}
impl From<Box<Error + marker::Sync + Send>> for BindError {
#[inline]
fn from(e: Box<Error + marker::Sync + Send>) -> BindError {
BindError::Conversion(e)
}
}
impl From<io::Error> for BindError {
#[inline]
fn from(e: io::Error) -> BindError {
BindError::Serialization(e)
}
}
#[inline]
pub fn bind<I, J, F, T, K>(portal: &str,
statement: &str,
formats: I,
values: J,
mut serializer: F,
result_formats: K,
buf: &mut Vec<u8>)
-> Result<(), BindError>
where I: IntoIterator<Item = i16>,
J: IntoIterator<Item = T>,
F: FnMut(T, &mut Vec<u8>) -> Result<IsNull, Box<Error + marker::Sync + Send>>,
K: IntoIterator<Item = i16>,
{
buf.push(b'B');
write_body(buf, |buf| {
try!(buf.write_cstr(portal));
try!(buf.write_cstr(statement));
try!(write_counted(formats, |f, buf| buf.write_i16::<BigEndian>(f), buf));
try!(write_counted(values,
|v, buf| write_nullable(|buf| serializer(v, buf), buf),
buf));
try!(write_counted(result_formats, |f, buf| buf.write_i16::<BigEndian>(f), buf));
Ok(())
})
}
#[inline]
fn write_counted<I, T, F, E>(items: I, mut serializer: F, buf: &mut Vec<u8>) -> Result<(), E>
where I: IntoIterator<Item = T>,
F: FnMut(T, &mut Vec<u8>) -> Result<(), E>,
E: From<io::Error>
{
let base = buf.len();
buf.extend_from_slice(&[0; 2]);
let mut count = 0;
for item in items {
try!(serializer(item, buf));
count += 1;
}
let count = try!(i16::from_usize(count));
BigEndian::write_i16(&mut buf[base..], count);
Ok(())
}
#[inline]
pub fn cancel_request(process_id: i32, secret_key: i32, buf: &mut Vec<u8>) {
write_body(buf, |buf| {
buf.write_i32::<BigEndian>(80877102).unwrap();
buf.write_i32::<BigEndian>(process_id).unwrap();
buf.write_i32::<BigEndian>(secret_key)
}).unwrap();
}
#[inline]
pub fn close(variant: u8, name: &str, buf: &mut Vec<u8>) -> io::Result<()> {
buf.push(b'C');
write_body(buf, |buf| {
buf.push(variant);
buf.write_cstr(name)
})
}
// FIXME ideally this'd take a Read but it's unclear what to do at EOF
#[inline]
pub fn copy_data(data: &[u8], buf: &mut Vec<u8>) -> io::Result<()> {
buf.push(b'd');
write_body(buf, |buf| {
buf.extend_from_slice(data);
Ok(())
})
}
#[inline]
pub fn copy_done(buf: &mut Vec<u8>) {
buf.push(b'c');
write_body(buf, |_| Ok::<(), io::Error>(())).unwrap();
}
#[inline]
pub fn copy_fail(message: &str, buf: &mut Vec<u8>) -> io::Result<()> {
buf.push(b'f');
write_body(buf, |buf| buf.write_cstr(message))
}
#[inline]
pub fn describe(variant: u8, name: &str, buf: &mut Vec<u8>) -> io::Result<()> {
buf.push(b'D');
write_body(buf, |buf| {
buf.push(variant);
buf.write_cstr(name)
})
}
#[inline]
pub fn execute(portal: &str, max_rows: i32, buf: &mut Vec<u8>) -> io::Result<()> {
buf.push(b'E');
write_body(buf, |buf| {
try!(buf.write_cstr(portal));
buf.write_i32::<BigEndian>(max_rows).unwrap();
Ok(())
})
}
#[inline]
pub fn parse<I>(name: &str, query: &str, param_types: I, buf: &mut Vec<u8>) -> io::Result<()>
where I: IntoIterator<Item = Oid>
{
buf.push(b'P');
write_body(buf, |buf| {
try!(buf.write_cstr(name));
try!(buf.write_cstr(query));
try!(write_counted(param_types, |t, buf| buf.write_u32::<BigEndian>(t), buf));
Ok(())
})
}
#[inline]
pub fn password_message(password: &str, buf: &mut Vec<u8>) -> io::Result<()> {
buf.push(b'p');
write_body(buf, |buf| buf.write_cstr(password))
}
#[inline]
pub fn query(query: &str, buf: &mut Vec<u8>) -> io::Result<()> {
buf.push(b'Q');
write_body(buf, |buf| buf.write_cstr(query))
}
#[inline]
pub fn ssl_request(buf: &mut Vec<u8>) {
write_body(buf, |buf| buf.write_i32::<BigEndian>(80877103)).unwrap();
}
#[inline]
pub fn startup_message<'a, I>(parameters: I, buf: &mut Vec<u8>) -> io::Result<()>
where I: IntoIterator<Item = (&'a str, &'a str)>
{
write_body(buf, |buf| {
buf.write_i32::<BigEndian>(196608).unwrap();
for (key, value) in parameters {
try!(buf.write_cstr(key.as_ref()));
try!(buf.write_cstr(value.as_ref()));
}
buf.push(0);
Ok(())
})
}
#[inline]
pub fn sync(buf: &mut Vec<u8>) {
buf.push(b'S');
write_body(buf, |_| Ok::<(), io::Error>(())).unwrap();
}
#[inline]
pub fn terminate(buf: &mut Vec<u8>) {
buf.push(b'X');
write_body(buf, |_| Ok::<(), io::Error>(())).unwrap();
}
trait WriteCStr {
fn write_cstr(&mut self, s: &str) -> Result<(), io::Error>;
}
impl WriteCStr for Vec<u8> {
#[inline]
fn write_cstr(&mut self, s: &str) -> Result<(), io::Error> {
if s.as_bytes().contains(&0) {
return Err(io::Error::new(io::ErrorKind::InvalidInput,
"string contains embedded null"));
}
self.extend_from_slice(s.as_bytes());
self.push(0);
Ok(())
}
}

8
postgres-protocol/src/message/mod.rs Normal file
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//! Postgres message protocol support.
//!
//! See [Postgres's documentation][docs] for more information on message flow.
//!
//! [docs]: https://www.postgresql.org/docs/9.5/static/protocol-flow.html
pub mod backend;
pub mod frontend;

850
postgres-protocol/src/types.rs Normal file
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//! Conversions to and from Postgres's binary format for various types.
use byteorder::{ReadBytesExt, WriteBytesExt, BigEndian};
use fallible_iterator::FallibleIterator;
use std::error::Error;
use std::str;
use {Oid, IsNull, write_nullable, FromUsize};
const RANGE_UPPER_UNBOUNDED: u8 = 0b0001_0000;
const RANGE_LOWER_UNBOUNDED: u8 = 0b0000_1000;
const RANGE_UPPER_INCLUSIVE: u8 = 0b0000_0100;
const RANGE_LOWER_INCLUSIVE: u8 = 0b0000_0010;
const RANGE_EMPTY: u8 = 0b0000_0001;
/// Serializes a `BOOL` value.
#[inline]
pub fn bool_to_sql(v: bool, buf: &mut Vec<u8>) {
buf.push(v as u8);
}
/// Deserializes a `BOOL` value.
#[inline]
pub fn bool_from_sql(buf: &[u8]) -> Result<bool, Box<Error + Sync + Send>> {
if buf.len() != 1 {
return Err("invalid buffer size".into());
}
Ok(buf[0] != 0)
}
/// Serializes a `BYTEA` value.
#[inline]
pub fn bytea_to_sql(v: &[u8], buf: &mut Vec<u8>) {
buf.extend_from_slice(v);
}
/// Deserializes a `BYTEA value.
#[inline]
pub fn bytea_from_sql(buf: &[u8]) -> &[u8] {
buf
}
/// Serializes a `TEXT`, `VARCHAR`, `CHAR(n)`, `NAME`, or `CITEXT` value.
#[inline]
pub fn text_to_sql(v: &str, buf: &mut Vec<u8>) {
buf.extend_from_slice(v.as_bytes());
}
/// Deserializes a `TEXT`, `VARCHAR`, `CHAR(n)`, `NAME`, or `CITEXT` value.
#[inline]
pub fn text_from_sql(buf: &[u8]) -> Result<&str, Box<Error + Sync + Send>> {
Ok(try!(str::from_utf8(buf)))
}
/// Serializes a `"char"` value.
#[inline]
pub fn char_to_sql(v: i8, buf: &mut Vec<u8>) {
buf.write_i8(v).unwrap();
}
/// Deserializes a `"char"` value.
#[inline]
pub fn char_from_sql(mut buf: &[u8]) -> Result<i8, Box<Error + Sync + Send>> {
let v = try!(buf.read_i8());
if !buf.is_empty() {
return Err("invalid buffer size".into());
}
Ok(v)
}
/// Serializes an `INT2` value.
#[inline]
pub fn int2_to_sql(v: i16, buf: &mut Vec<u8>) {
buf.write_i16::<BigEndian>(v).unwrap();
}
/// Deserializes an `INT2` value.
#[inline]
pub fn int2_from_sql(mut buf: &[u8]) -> Result<i16, Box<Error + Sync + Send>> {
let v = try!(buf.read_i16::<BigEndian>());
if !buf.is_empty() {
return Err("invalid buffer size".into());
}
Ok(v)
}
/// Serializes an `INT4` value.
#[inline]
pub fn int4_to_sql(v: i32, buf: &mut Vec<u8>) {
buf.write_i32::<BigEndian>(v).unwrap();
}
/// Deserializes an `INT4` value.
#[inline]
pub fn int4_from_sql(mut buf: &[u8]) -> Result<i32, Box<Error + Sync + Send>> {
let v = try!(buf.read_i32::<BigEndian>());
if !buf.is_empty() {
return Err("invalid buffer size".into());
}
Ok(v)
}
/// Serializes an `OID` value.
#[inline]
pub fn oid_to_sql(v: Oid, buf: &mut Vec<u8>) {
buf.write_u32::<BigEndian>(v).unwrap();
}
/// Deserializes an `OID` value.
#[inline]
pub fn oid_from_sql(mut buf: &[u8]) -> Result<Oid, Box<Error + Sync + Send>> {
let v = try!(buf.read_u32::<BigEndian>());
if !buf.is_empty() {
return Err("invalid buffer size".into());
}
Ok(v)
}
/// Serializes an `INT8` value.
#[inline]
pub fn int8_to_sql(v: i64, buf: &mut Vec<u8>) {
buf.write_i64::<BigEndian>(v).unwrap();
}
/// Deserializes an `INT8` value.
#[inline]
pub fn int8_from_sql(mut buf: &[u8]) -> Result<i64, Box<Error + Sync + Send>> {
let v = try!(buf.read_i64::<BigEndian>());
if !buf.is_empty() {
return Err("invalid buffer size".into());
}
Ok(v)
}
/// Serializes a `FLOAT4` value.
#[inline]
pub fn float4_to_sql(v: f32, buf: &mut Vec<u8>) {
buf.write_f32::<BigEndian>(v).unwrap();
}
/// Deserializes a `FLOAT4` value.
#[inline]
pub fn float4_from_sql(mut buf: &[u8]) -> Result<f32, Box<Error + Sync + Send>> {
let v = try!(buf.read_f32::<BigEndian>());
if !buf.is_empty() {
return Err("invalid buffer size".into());
}
Ok(v)
}
/// Serializes a `FLOAT8` value.
#[inline]
pub fn float8_to_sql(v: f64, buf: &mut Vec<u8>) {
buf.write_f64::<BigEndian>(v).unwrap();
}
/// Deserializes a `FLOAT8` value.
#[inline]
pub fn float8_from_sql(mut buf: &[u8]) -> Result<f64, Box<Error + Sync + Send>> {
let v = try!(buf.read_f64::<BigEndian>());
if !buf.is_empty() {
return Err("invalid buffer size".into());
}
Ok(v)
}
/// Serializes an `HSTORE` value.
#[inline]
pub fn hstore_to_sql<'a, I>(values: I, buf: &mut Vec<u8>) -> Result<(), Box<Error + Sync + Send>>
where I: IntoIterator<Item = (&'a str, Option<&'a str>)>
{
let base = buf.len();
buf.extend_from_slice(&[0; 4]);
let mut count = 0;
for (key, value) in values {
count += 1;
try!(write_pascal_string(key, buf));
match value {
Some(value) => {
try!(write_pascal_string(value, buf));
}
None => buf.write_i32::<BigEndian>(-1).unwrap(),
}
}
let count = try!(i32::from_usize(count));
(&mut buf[base..base + 4]).write_i32::<BigEndian>(count).unwrap();
Ok(())
}
fn write_pascal_string(s: &str, buf: &mut Vec<u8>) -> Result<(), Box<Error + Sync + Send>> {
let size = try!(i32::from_usize(s.len()));
buf.write_i32::<BigEndian>(size).unwrap();
buf.extend_from_slice(s.as_bytes());
Ok(())
}
/// Deserializes an `HSTORE` value.
#[inline]
pub fn hstore_from_sql<'a>(mut buf: &'a [u8])
-> Result<HstoreEntries<'a>, Box<Error + Sync + Send>> {
let count = try!(buf.read_i32::<BigEndian>());
if count < 0 {
return Err("invalid entry count".into());
}
Ok(HstoreEntries {
remaining: count,
buf: buf,
})
}
/// A fallible iterator over `HSTORE` entries.
pub struct HstoreEntries<'a> {
remaining: i32,
buf: &'a [u8],
}
impl<'a> FallibleIterator for HstoreEntries<'a> {
type Item = (&'a str, Option<&'a str>);
type Error = Box<Error + Sync + Send>;
#[inline]
fn next(&mut self) -> Result<Option<(&'a str, Option<&'a str>)>, Box<Error + Sync + Send>> {
if self.remaining == 0 {
if !self.buf.is_empty() {
return Err("invalid buffer size".into());
}
return Ok(None);
}
self.remaining -= 1;
let key_len = try!(self.buf.read_i32::<BigEndian>());
if key_len < 0 {
return Err("invalid key length".into());
}
let (key, buf) = self.buf.split_at(key_len as usize);
let key = try!(str::from_utf8(key));
self.buf = buf;
let value_len = try!(self.buf.read_i32::<BigEndian>());
let value = if value_len < 0 {
None
} else {
let (value, buf) = self.buf.split_at(value_len as usize);
let value = try!(str::from_utf8(value));
self.buf = buf;
Some(value)
};
Ok(Some((key, value)))
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let len = self.remaining as usize;
(len, Some(len))
}
}
/// Serializes a `VARBIT` or `BIT` value.
#[inline]
pub fn varbit_to_sql<I>(len: usize, v: I, buf: &mut Vec<u8>) -> Result<(), Box<Error + Sync + Send>>
where I: Iterator<Item = u8>
{
let len = try!(i32::from_usize(len));
buf.write_i32::<BigEndian>(len).unwrap();
for byte in v {
buf.push(byte);
}
Ok(())
}
/// Deserializes a `VARBIT` or `BIT` value.
#[inline]
pub fn varbit_from_sql<'a>(mut buf: &'a [u8]) -> Result<Varbit<'a>, Box<Error + Sync + Send>> {
let len = try!(buf.read_i32::<BigEndian>());
if len < 0 {
return Err("invalid varbit length".into());
}
let bytes = (len as usize + 7) / 8;
if buf.len() != bytes {
return Err("invalid message length".into());
}
Ok(Varbit {
len: len as usize,
bytes: buf,
})
}
/// A `VARBIT` value.
pub struct Varbit<'a> {
len: usize,
bytes: &'a [u8],
}
impl<'a> Varbit<'a> {
/// Returns the number of bits.
#[inline]
pub fn len(&self) -> usize {
self.len
}
/// Returns the bits as a slice of bytes.
#[inline]
pub fn bytes(&self) -> &'a [u8] {
self.bytes
}
}
/// Serializes a `TIMESTAMP` or `TIMESTAMPTZ` value.
///
/// The value should represent the number of microseconds since midnight, January 1st, 2000.
#[inline]
pub fn timestamp_to_sql(v: i64, buf: &mut Vec<u8>) {
buf.write_i64::<BigEndian>(v).unwrap();
}
/// Deserializes a `TIMESTAMP` or `TIMESTAMPTZ` value.
///
/// The value represents the number of microseconds since midnight, January 1st, 2000.
#[inline]
pub fn timestamp_from_sql(mut buf: &[u8]) -> Result<i64, Box<Error + Sync + Send>> {
let v = try!(buf.read_i64::<BigEndian>());
if !buf.is_empty() {
return Err("invalid message length".into());
}
Ok(v)
}
/// Serializes a `DATE` value.
///
/// The value should represent the number of days since January 1st, 2000.
#[inline]
pub fn date_to_sql(v: i32, buf: &mut Vec<u8>) {
buf.write_i32::<BigEndian>(v).unwrap();
}
/// Deserializes a `DATE` value.
///
/// The value represents the number of days since January 1st, 2000.
#[inline]
pub fn date_from_sql(mut buf: &[u8]) -> Result<i32, Box<Error + Sync + Send>> {
let v = try!(buf.read_i32::<BigEndian>());
if !buf.is_empty() {
return Err("invalid message length".into());
}
Ok(v)
}
/// Serializes a `TIME` or `TIMETZ` value.
///
/// The value should represent the number of microseconds since midnight.
#[inline]
pub fn time_to_sql(v: i64, buf: &mut Vec<u8>) {
buf.write_i64::<BigEndian>(v).unwrap();
}
/// Deserializes a `TIME` or `TIMETZ` value.
///
/// The value represents the number of microseconds since midnight.
#[inline]
pub fn time_from_sql(mut buf: &[u8]) -> Result<i64, Box<Error + Sync + Send>> {
let v = try!(buf.read_i64::<BigEndian>());
if !buf.is_empty() {
return Err("invalid message length".into());
}
Ok(v)
}
/// Serializes a `MACADDR` value.
#[inline]
pub fn macaddr_to_sql(v: [u8; 6], buf: &mut Vec<u8>) {
buf.extend_from_slice(&v);
}
/// Deserializes a `MACADDR` value.
#[inline]
pub fn macaddr_from_sql(buf: &[u8]) -> Result<[u8; 6], Box<Error + Sync + Send>> {
if buf.len() != 6 {
return Err("invalid message length".into());
}
let mut out = [0; 6];
out.copy_from_slice(buf);
Ok(out)
}
/// Serializes a `UUID` value.
#[inline]
pub fn uuid_to_sql(v: [u8; 16], buf: &mut Vec<u8>) {
buf.extend_from_slice(&v);
}
/// Deserializes a `UUID` value.
#[inline]
pub fn uuid_from_sql(buf: &[u8]) -> Result<[u8; 16], Box<Error + Sync + Send>> {
if buf.len() != 16 {
return Err("invalid message length".into());
}
let mut out = [0; 16];
out.copy_from_slice(buf);
Ok(out)
}
/// Serializes an array value.
#[inline]
pub fn array_to_sql<T, I, J, F>(dimensions: I,
has_nulls: bool,
element_type: Oid,
elements: J,
mut serializer: F,
buf: &mut Vec<u8>)
-> Result<(), Box<Error + Sync + Send>>
where I: IntoIterator<Item = ArrayDimension>,
J: IntoIterator<Item = T>,
F: FnMut(T, &mut Vec<u8>) -> Result<IsNull, Box<Error + Sync + Send>>
{
let dimensions_idx = buf.len();
buf.extend_from_slice(&[0; 4]);
buf.write_i32::<BigEndian>(has_nulls as i32).unwrap();
buf.write_u32::<BigEndian>(element_type).unwrap();
let mut num_dimensions = 0;
for dimension in dimensions {
num_dimensions += 1;
buf.write_i32::<BigEndian>(dimension.len).unwrap();
buf.write_i32::<BigEndian>(dimension.lower_bound).unwrap();
}
let num_dimensions = try!(i32::from_usize(num_dimensions));
(&mut buf[dimensions_idx..dimensions_idx + 4])
.write_i32::<BigEndian>(num_dimensions)
.unwrap();
for element in elements {
try!(write_nullable(|buf| serializer(element, buf), buf));
}
Ok(())
}
/// Deserializes an array value.
#[inline]
pub fn array_from_sql<'a>(mut buf: &'a [u8]) -> Result<Array<'a>, Box<Error + Sync + Send>> {
let dimensions = try!(buf.read_i32::<BigEndian>());
if dimensions < 0 {
return Err("invalid dimension count".into());
}
let has_nulls = try!(buf.read_i32::<BigEndian>()) != 0;
let element_type = try!(buf.read_u32::<BigEndian>());
let mut r = buf;
let mut elements = 1i32;
for _ in 0..dimensions {
let len = try!(r.read_i32::<BigEndian>());
if len < 0 {
return Err("invalid dimension size".into());
}
let _lower_bound = try!(r.read_i32::<BigEndian>());
elements = match elements.checked_mul(len) {
Some(elements) => elements,
None => return Err("too many array elements".into()),
};
}
if dimensions == 0 {
elements = 0;
}
Ok(Array {
dimensions: dimensions,
has_nulls: has_nulls,
element_type: element_type,
elements: elements,
buf: buf,
})
}
/// A Postgres array.
pub struct Array<'a> {
dimensions: i32,
has_nulls: bool,
element_type: Oid,
elements: i32,
buf: &'a [u8],
}
impl<'a> Array<'a> {
/// Returns true if there are `NULL` elements.
#[inline]
pub fn has_nulls(&self) -> bool {
self.has_nulls
}
/// Returns the OID of the elements of the array.
#[inline]
pub fn element_type(&self) -> Oid {
self.element_type
}
/// Returns an iterator over the dimensions of the array.
#[inline]
pub fn dimensions(&self) -> ArrayDimensions<'a> {
ArrayDimensions(&self.buf[..self.dimensions as usize * 8])
}
/// Returns an iterator over the values of the array.
#[inline]
pub fn values(&self) -> ArrayValues<'a> {
ArrayValues {
remaining: self.elements,
buf: &self.buf[self.dimensions as usize * 8..],
}
}
}
/// An iterator over the dimensions of an array.
pub struct ArrayDimensions<'a>(&'a [u8]);
impl<'a> FallibleIterator for ArrayDimensions<'a> {
type Item = ArrayDimension;
type Error = Box<Error + Sync + Send>;
#[inline]
fn next(&mut self) -> Result<Option<ArrayDimension>, Box<Error + Sync + Send>> {
if self.0.is_empty() {
return Ok(None);
}
let len = try!(self.0.read_i32::<BigEndian>());
let lower_bound = try!(self.0.read_i32::<BigEndian>());
Ok(Some(ArrayDimension {
len: len,
lower_bound: lower_bound,
}))
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let len = self.0.len() / 8;
(len, Some(len))
}
}
/// Information about a dimension of an array.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct ArrayDimension {
/// The length of this dimension.
pub len: i32,
/// The base value used to index into this dimension.
pub lower_bound: i32,
}
/// An iterator over the values of an array, in row-major order.
pub struct ArrayValues<'a> {
remaining: i32,
buf: &'a [u8],
}
impl<'a> FallibleIterator for ArrayValues<'a> {
type Item = Option<&'a [u8]>;
type Error = Box<Error + Sync + Send>;
#[inline]
fn next(&mut self) -> Result<Option<Option<&'a [u8]>>, Box<Error + Sync + Send>> {
if self.remaining == 0 {
if !self.buf.is_empty() {
return Err("invalid message length".into());
}
return Ok(None);
}
self.remaining -= 1;
let len = try!(self.buf.read_i32::<BigEndian>());
let val = if len < 0 {
None
} else {
if self.buf.len() < len as usize {
return Err("invalid value length".into());
}
let (val, buf) = self.buf.split_at(len as usize);
self.buf = buf;
Some(val)
};
Ok(Some(val))
}
fn size_hint(&self) -> (usize, Option<usize>) {
let len = self.remaining as usize;
(len, Some(len))
}
}
/// Serializes an empty range.
#[inline]
pub fn empty_range_to_sql(buf: &mut Vec<u8>) {
buf.push(RANGE_EMPTY);
}
/// Serializes a range value.
pub fn range_to_sql<F, G>(lower: F,
upper: G,
buf: &mut Vec<u8>)
-> Result<(), Box<Error + Sync + Send>>
where F: FnOnce(&mut Vec<u8>) -> Result<RangeBound<IsNull>, Box<Error + Sync + Send>>,
G: FnOnce(&mut Vec<u8>) -> Result<RangeBound<IsNull>, Box<Error + Sync + Send>>
{
let tag_idx = buf.len();
buf.push(0);
let mut tag = 0;
match try!(write_bound(lower, buf)) {
RangeBound::Inclusive(()) => tag |= RANGE_LOWER_INCLUSIVE,
RangeBound::Exclusive(()) => {}
RangeBound::Unbounded => tag |= RANGE_LOWER_UNBOUNDED,
}
match try!(write_bound(upper, buf)) {
RangeBound::Inclusive(()) => tag |= RANGE_UPPER_INCLUSIVE,
RangeBound::Exclusive(()) => {}
RangeBound::Unbounded => tag |= RANGE_UPPER_UNBOUNDED,
}
buf[tag_idx] = tag;
Ok(())
}
fn write_bound<F>(bound: F, buf: &mut Vec<u8>) -> Result<RangeBound<()>, Box<Error + Sync + Send>>
where F: FnOnce(&mut Vec<u8>) -> Result<RangeBound<IsNull>, Box<Error + Sync + Send>>
{
let base = buf.len();
buf.extend_from_slice(&[0; 4]);
let (null, ret) = match try!(bound(buf)) {
RangeBound::Inclusive(null) => (Some(null), RangeBound::Inclusive(())),
RangeBound::Exclusive(null) => (Some(null), RangeBound::Exclusive(())),
RangeBound::Unbounded => (None, RangeBound::Unbounded),
};
match null {
Some(null) => {
let len = match null {
IsNull::No => try!(i32::from_usize(buf.len() - base - 4)),
IsNull::Yes => -1,
};
(&mut buf[base..base + 4]).write_i32::<BigEndian>(len).unwrap();
}
None => buf.truncate(base),
}
Ok(ret)
}
/// One side of a range.
pub enum RangeBound<T> {
/// An inclusive bound.
Inclusive(T),
/// An exclusive bound.
Exclusive(T),
/// No bound.
Unbounded,
}
/// Deserializes a range value.
#[inline]
pub fn range_from_sql<'a>(mut buf: &'a [u8]) -> Result<Range<'a>, Box<Error + Sync + Send>> {
let tag = try!(buf.read_u8());
if tag == RANGE_EMPTY {
if !buf.is_empty() {
return Err("invalid message size".into());
}
return Ok(Range::Empty);
}
let lower = try!(read_bound(&mut buf, tag, RANGE_LOWER_UNBOUNDED, RANGE_LOWER_INCLUSIVE));
let upper = try!(read_bound(&mut buf, tag, RANGE_UPPER_UNBOUNDED, RANGE_UPPER_INCLUSIVE));
if !buf.is_empty() {
return Err("invalid message size".into());
}
Ok(Range::Nonempty(lower, upper))
}
#[inline]
fn read_bound<'a>(buf: &mut &'a [u8],
tag: u8,
unbounded: u8,
inclusive: u8)
-> Result<RangeBound<Option<&'a [u8]>>, Box<Error + Sync + Send>> {
if tag & unbounded != 0 {
Ok(RangeBound::Unbounded)
} else {
let len = try!(buf.read_i32::<BigEndian>());
let value = if len < 0 {
None
} else {
let len = len as usize;
if buf.len() < len {
return Err("invalid message size".into());
}
let (value, tail) = buf.split_at(len);
*buf = tail;
Some(value)
};
if tag & inclusive != 0 {
Ok(RangeBound::Inclusive(value))
} else {
Ok(RangeBound::Exclusive(value))
}
}
}
/// A Postgres range.
pub enum Range<'a> {
/// An empty range.
Empty,
/// A nonempty range.
Nonempty(RangeBound<Option<&'a [u8]>>, RangeBound<Option<&'a [u8]>>),
}
#[cfg(test)]
mod test {
use std::collections::HashMap;
use fallible_iterator::FallibleIterator;
use super::*;
use IsNull;
#[test]
fn bool() {
let mut buf = vec![];
bool_to_sql(true, &mut buf);
assert_eq!(bool_from_sql(&buf).unwrap(), true);
let mut buf = vec![];
bool_to_sql(false, &mut buf);
assert_eq!(bool_from_sql(&buf).unwrap(), false);
}
#[test]
fn int2() {
let mut buf = vec![];
int2_to_sql(0x0102, &mut buf);
assert_eq!(int2_from_sql(&buf).unwrap(), 0x0102);
}
#[test]
fn int4() {
let mut buf = vec![];
int4_to_sql(0x01020304, &mut buf);
assert_eq!(int4_from_sql(&buf).unwrap(), 0x01020304);
}
#[test]
fn int8() {
let mut buf = vec![];
int8_to_sql(0x0102030405060708, &mut buf);
assert_eq!(int8_from_sql(&buf).unwrap(), 0x0102030405060708);
}
#[test]
fn float4() {
let mut buf = vec![];
float4_to_sql(10343.95, &mut buf);
assert_eq!(float4_from_sql(&buf).unwrap(), 10343.95);
}
#[test]
fn float8() {
let mut buf = vec![];
float8_to_sql(10343.95, &mut buf);
assert_eq!(float8_from_sql(&buf).unwrap(), 10343.95);
}
#[test]
fn hstore() {
let mut map = HashMap::new();
map.insert("hello", Some("world"));
map.insert("hola", None);
let mut buf = vec![];
hstore_to_sql(map.iter().map(|(&k, &v)| (k, v)), &mut buf).unwrap();
assert_eq!(hstore_from_sql(&buf).unwrap().collect::<HashMap<_, _>>().unwrap(),
map);
}
#[test]
fn varbit() {
let len = 12;
let bits = [0b0010_1011, 0b0000_1111];
let mut buf = vec![];
varbit_to_sql(len, bits.iter().cloned(), &mut buf).unwrap();
let out = varbit_from_sql(&buf).unwrap();
assert_eq!(out.len(), len);
assert_eq!(out.bytes(), bits);
}
#[test]
fn array() {
let dimensions = [ArrayDimension {
len: 1,
lower_bound: 10,
},
ArrayDimension {
len: 2,
lower_bound: 0,
}];
let values = [None, Some(&b"hello"[..])];
let mut buf = vec![];
array_to_sql(dimensions.iter().cloned(),
true,
10,
values.iter().cloned(),
|v, buf| {
match v {
Some(v) => {
buf.extend_from_slice(v);
Ok(IsNull::No)
}
None => Ok(IsNull::Yes),
}
},
&mut buf)
.unwrap();
let array = array_from_sql(&buf).unwrap();
assert_eq!(array.has_nulls(), true);
assert_eq!(array.element_type(), 10);
assert_eq!(array.dimensions().collect::<Vec<_>>().unwrap(), dimensions);
assert_eq!(array.values().collect::<Vec<_>>().unwrap(), values);
}
}

2
postgres-shared/Cargo.toml
View File

@ -20,7 +20,7 @@ with-uuid = ["uuid"]
hex = "0.2" hex = "0.2"
fallible-iterator = "0.1.3" fallible-iterator = "0.1.3"
phf = "=0.7.21" phf = "=0.7.21"
postgres-protocol = "0.2" postgres-protocol = { version = "0.2", path = "../postgres-protocol" }
bit-vec = { version = "0.4", optional = true } bit-vec = { version = "0.4", optional = true }
chrono = { version = "0.3", optional = true } chrono = { version = "0.3", optional = true }

2
postgres/Cargo.toml
View File

@ -42,7 +42,6 @@ bufstream = "0.1"
fallible-iterator = "0.1.3" fallible-iterator = "0.1.3"
hex = "0.2" hex = "0.2"
log = "0.3" log = "0.3"
postgres-protocol = "0.2"
openssl = { version = "0.9.2", optional = true } openssl = { version = "0.9.2", optional = true }
native-tls = { version = "0.1", optional = true } native-tls = { version = "0.1", optional = true }
@ -50,6 +49,7 @@ rustc-serialize = { version = "0.3", optional = true }
schannel = { version = "0.1", optional = true } schannel = { version = "0.1", optional = true }
security-framework = { version = "0.1.2", optional = true } security-framework = { version = "0.1.2", optional = true }
postgres-protocol = { version = "0.2", path = "../postgres-protocol" }
postgres-shared = { version = "0.2", path = "../postgres-shared" } postgres-shared = { version = "0.2", path = "../postgres-shared" }
[dev-dependencies] [dev-dependencies]

2
tokio-postgres/Cargo.toml
View File

@ -25,8 +25,8 @@ with-openssl = ["tokio-openssl", "openssl"]
fallible-iterator = "0.1.3" fallible-iterator = "0.1.3"
futures = "0.1.7" futures = "0.1.7"
futures-state-stream = "0.1" futures-state-stream = "0.1"
postgres-protocol = { version = "0.2", path = "../postgres-protocol" }
postgres-shared = { version = "0.2", path = "../postgres-shared" } postgres-shared = { version = "0.2", path = "../postgres-shared" }
postgres-protocol = "0.2"
tokio-core = "0.1" tokio-core = "0.1"
tokio-dns-unofficial = "0.1" tokio-dns-unofficial = "0.1"