Move postgres-protocol in-tree

Author: sfackler

Cargo.toml

@@ -1,2 +1,8 @@
 [workspace]
-members = ["codegen", "postgres", "postgres-shared", "tokio-postgres"]
+members = [
+    "codegen",
+    "postgres",
+    "postgres-protocol",
+    "postgres-shared",
+    "tokio-postgres"
+]

postgres-protocol/.gitignore

@@ -0,0 +1,4 @@
+target
+Cargo.lock
+.idea/
+*.iml

postgres-protocol/.travis.yml

@@ -0,0 +1,7 @@
+language: rust
+cache: cargo
+rust:
+- nightly
+- 1.10.0
+script:
+- cargo test

postgres-protocol/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "postgres-protocol"
+version = "0.2.1"
+authors = ["Steven Fackler <[email protected]>"]
+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"

postgres-protocol/LICENSE-APACHE

@@ -0,0 +1,201 @@
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postgres-protocol/LICENSE-MIT

@@ -0,0 +1,22 @@
+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
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

postgres-protocol/src/authentication.rs

@@ -0,0 +1,34 @@
+//! 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");
+    }
+}

postgres-protocol/src/lib.rs

@@ -0,0 +1,73 @@
+//! 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);