360 lines
9.4 KiB
Rust
360 lines
9.4 KiB
Rust
extern mod extra;
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use extra::time::Timespec;
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use extra::json;
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use extra::json::Json;
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use extra::uuid::Uuid;
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use std::rt::io::Decorator;
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use std::rt::io::extensions::{WriterByteConversions, ReaderByteConversions};
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use std::rt::io::mem::{MemWriter, BufReader};
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use std::str;
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/// A Postgres OID
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pub type Oid = i32;
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// Values from pg_type.h
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static BOOLOID: Oid = 16;
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static BYTEAOID: Oid = 17;
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static CHAROID: Oid = 18;
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static INT8OID: Oid = 20;
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static INT2OID: Oid = 21;
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static INT4OID: Oid = 23;
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static TEXTOID: Oid = 25;
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static JSONOID: Oid = 114;
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static FLOAT4OID: Oid = 700;
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static FLOAT8OID: Oid = 701;
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static BPCHAROID: Oid = 1042;
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static VARCHAROID: Oid = 1043;
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static TIMESTAMPOID: Oid = 1114;
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static TIMESTAMPZOID: Oid = 1184;
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static UUIDOID: Oid = 2950;
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static USEC_PER_SEC: i64 = 1_000_000;
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static NSEC_PER_USEC: i64 = 1_000;
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// Number of seconds from 1970-01-01 to 2000-01-01
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static TIME_SEC_CONVERSION: i64 = 946684800;
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/// A Postgres type
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#[deriving(Eq)]
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pub enum PostgresType {
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/// BOOL
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PgBool,
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/// BYTEA
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PgByteA,
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/// "char"
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PgChar,
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/// INT8/BIGINT
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PgInt8,
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/// INT2/SMALLINT
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PgInt2,
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/// INT4/INT
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PgInt4,
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/// TEXT
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PgText,
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/// JSON
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PgJson,
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/// FLOAT4/REAL
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PgFloat4,
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/// FLOAT8/DOUBLE PRECISION
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PgFloat8,
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/// TIMESTAMP
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PgTimestamp,
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/// TIMESTAMP WITH TIME ZONE
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PgTimestampZ,
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/// CHAR(n)/CHARACTER(n)
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PgCharN,
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/// VARCHAR/CHARACTER VARYING
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PgVarchar,
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/// UUID
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PgUuid,
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/// An unknown type along with its OID
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PgUnknownType(Oid)
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}
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impl PostgresType {
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/// Creates a PostgresType from a Postgres OID.
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pub fn from_oid(oid: Oid) -> PostgresType {
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match oid {
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BOOLOID => PgBool,
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BYTEAOID => PgByteA,
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CHAROID => PgChar,
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INT8OID => PgInt8,
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INT2OID => PgInt2,
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INT4OID => PgInt4,
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TEXTOID => PgText,
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JSONOID => PgJson,
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FLOAT4OID => PgFloat4,
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FLOAT8OID => PgFloat8,
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TIMESTAMPOID => PgTimestamp,
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TIMESTAMPZOID => PgTimestampZ,
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BPCHAROID => PgCharN,
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VARCHAROID => PgVarchar,
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UUIDOID => PgUuid,
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oid => PgUnknownType(oid)
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}
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}
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/// Returns the wire format needed for the value of `self`.
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pub fn result_format(&self) -> Format {
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match *self {
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PgUnknownType(*) => Text,
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_ => Binary
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}
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}
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}
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/// The wire format of a Postgres value
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pub enum Format {
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/// A user-readable string format
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Text = 0,
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/// A machine-readable binary format
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Binary = 1
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}
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macro_rules! check_types(
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($($expected:pat)|+, $actual:ident) => (
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match $actual {
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$($expected)|+ => (),
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actual => fail2!("Invalid Postgres type {:?}", actual)
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}
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)
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)
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/// A trait for types that can be created from a Postgres value
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pub trait FromSql {
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/// Creates a new value of this type from a buffer of Postgres data.
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///
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/// If the value was `NULL`, the buffer will be `None`.
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///
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/// # Failure
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///
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/// Fails if this type can not be created from the provided Postgres type.
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fn from_sql(ty: PostgresType, raw: &Option<~[u8]>) -> Self;
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}
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macro_rules! from_map_impl(
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($($expected:pat)|+, $t:ty, $blk:expr) => (
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impl FromSql for Option<$t> {
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fn from_sql(ty: PostgresType, raw: &Option<~[u8]>) -> Option<$t> {
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check_types!($($expected)|+, ty)
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raw.as_ref().map($blk)
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}
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}
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)
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)
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macro_rules! from_conversions_impl(
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($expected:pat, $t:ty, $f:ident) => (
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from_map_impl!($expected, $t, |buf| {
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let mut reader = BufReader::new(buf.as_slice());
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reader.$f()
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})
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)
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)
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macro_rules! from_option_impl(
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($t:ty) => (
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impl FromSql for $t {
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fn from_sql(ty: PostgresType, raw: &Option<~[u8]>) -> $t {
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// FIXME when you can specify Self types properly
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let ret: Option<$t> = FromSql::from_sql(ty, raw);
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ret.unwrap()
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}
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}
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)
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)
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from_map_impl!(PgBool, bool, |buf| { buf[0] != 0 })
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from_option_impl!(bool)
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from_conversions_impl!(PgChar, i8, read_i8_)
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from_option_impl!(i8)
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from_conversions_impl!(PgInt2, i16, read_be_i16_)
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from_option_impl!(i16)
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from_conversions_impl!(PgInt4, i32, read_be_i32_)
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from_option_impl!(i32)
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from_conversions_impl!(PgInt8, i64, read_be_i64_)
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from_option_impl!(i64)
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from_conversions_impl!(PgFloat4, f32, read_be_f32_)
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from_option_impl!(f32)
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from_conversions_impl!(PgFloat8, f64, read_be_f64_)
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from_option_impl!(f64)
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from_map_impl!(PgVarchar | PgText | PgCharN, ~str, |buf| {
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str::from_utf8(buf.as_slice())
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})
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from_option_impl!(~str)
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impl FromSql for Option<~[u8]> {
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fn from_sql(ty: PostgresType, raw: &Option<~[u8]>) -> Option<~[u8]> {
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check_types!(PgByteA, ty)
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raw.clone()
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}
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}
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from_option_impl!(~[u8])
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from_map_impl!(PgJson, Json, |buf| {
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json::from_str(str::from_utf8_slice(buf.as_slice())).unwrap()
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})
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from_option_impl!(Json)
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from_map_impl!(PgUuid, Uuid, |buf| {
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Uuid::from_bytes(buf.as_slice()).unwrap()
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})
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from_option_impl!(Uuid)
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from_map_impl!(PgTimestamp | PgTimestampZ, Timespec, |buf| {
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let mut rdr = BufReader::new(buf.as_slice());
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let t = rdr.read_be_i64_();
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let mut sec = t / USEC_PER_SEC + TIME_SEC_CONVERSION;
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let mut usec = t % USEC_PER_SEC;
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if usec < 0 {
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sec -= 1;
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usec = USEC_PER_SEC + usec;
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}
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Timespec::new(sec, (usec * NSEC_PER_USEC) as i32)
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})
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from_option_impl!(Timespec)
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/// A trait for types that can be converted into Postgres values
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pub trait ToSql {
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/// Converts the value of `self` into a format appropriate for the Postgres
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/// backend.
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///
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/// # Failure
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///
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/// Fails if this type cannot be converted into the specified Postgres
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/// type.
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>);
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}
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macro_rules! to_option_impl(
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($($oid:ident)|+, $t:ty) => (
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impl ToSql for Option<$t> {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!($($oid)|+, ty)
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match *self {
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None => (Text, None),
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Some(ref val) => val.to_sql(ty)
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}
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}
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}
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);
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(self, $($oid:ident)|+, $t:ty) => (
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impl<'self> ToSql for Option<$t> {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!($($oid)|+, ty)
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match *self {
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None => (Text, None),
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Some(ref val) => val.to_sql(ty)
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}
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}
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}
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)
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)
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macro_rules! to_conversions_impl(
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($($oid:ident)|+, $t:ty, $f:ident) => (
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impl ToSql for $t {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!($($oid)|+, ty)
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let mut writer = MemWriter::new();
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writer.$f(*self);
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(Binary, Some(writer.inner()))
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}
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}
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)
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)
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impl ToSql for bool {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgBool, ty)
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(Binary, Some(~[*self as u8]))
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}
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}
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to_option_impl!(PgBool, bool)
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to_conversions_impl!(PgChar, i8, write_i8_)
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to_option_impl!(PgChar, i8)
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to_conversions_impl!(PgInt2, i16, write_be_i16_)
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to_option_impl!(PgInt2, i16)
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to_conversions_impl!(PgInt4, i32, write_be_i32_)
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to_option_impl!(PgInt4, i32)
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to_conversions_impl!(PgInt8, i64, write_be_i64_)
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to_option_impl!(PgInt8, i64)
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to_conversions_impl!(PgFloat4, f32, write_be_f32_)
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to_option_impl!(PgFloat4, f32)
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to_conversions_impl!(PgFloat8, f64, write_be_f64_)
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to_option_impl!(PgFloat8, f64)
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impl ToSql for ~str {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgVarchar | PgText | PgCharN, ty)
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(Text, Some(self.as_bytes().to_owned()))
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}
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}
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impl<'self> ToSql for &'self str {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgVarchar | PgText | PgCharN, ty)
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(Text, Some(self.as_bytes().to_owned()))
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}
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}
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to_option_impl!(PgVarchar | PgText | PgCharN, ~str)
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to_option_impl!(self, PgVarchar | PgText | PgCharN, &'self str)
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impl ToSql for ~[u8] {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgByteA, ty)
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(Binary, Some(self.to_owned()))
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}
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}
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impl<'self> ToSql for &'self [u8] {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgByteA, ty)
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(Binary, Some(self.to_owned()))
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}
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}
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to_option_impl!(PgByteA, ~[u8])
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to_option_impl!(self, PgByteA, &'self [u8])
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impl ToSql for Json {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgJson, ty)
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(Text, Some(self.to_str().into_bytes()))
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}
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}
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to_option_impl!(PgJson, Json)
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impl ToSql for Uuid {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgUuid, ty)
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(Binary, Some(self.to_bytes().to_owned()))
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}
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}
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to_option_impl!(PgUuid, Uuid)
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impl ToSql for Timespec {
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fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
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check_types!(PgTimestamp | PgTimestampZ, ty)
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let t = (self.sec - TIME_SEC_CONVERSION) * USEC_PER_SEC
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+ self.nsec as i64 / NSEC_PER_USEC;
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let mut buf = MemWriter::new();
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buf.write_be_i64_(t);
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(Binary, Some(buf.inner()))
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}
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}
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to_option_impl!(PgTimestamp | PgTimestampZ, Timespec)
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