735 lines
20 KiB
Rust
735 lines
20 KiB
Rust
//! Traits dealing with Postgres data types
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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::hashmap::HashMap;
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use std::io::Decorator;
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use std::io::mem::{MemWriter, BufReader};
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use std::mem;
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use std::str;
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use std::vec;
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use self::array::{Array, ArrayBase, DimensionInfo};
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use self::range::{RangeBound, Inclusive, Exclusive, Range};
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pub mod array;
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pub mod range;
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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 INT4ARRAYOID: Oid = 1007;
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static INT8ARRAYOID: Oid = 1016;
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static FLOAT4ARRAYOID: Oid = 1021;
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static FLAOT8ARRAYOID: Oid = 1022;
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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 INT4RANGEOID: Oid = 3904;
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static TSRANGEOID: Oid = 3908;
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static TSTZRANGEOID: Oid = 3910;
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static INT8RANGEOID: Oid = 3926;
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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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static RANGE_UPPER_UNBOUNDED: i8 = 0b0001_0000;
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static RANGE_LOWER_UNBOUNDED: i8 = 0b0000_1000;
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static RANGE_UPPER_INCLUSIVE: i8 = 0b0000_0100;
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static RANGE_LOWER_INCLUSIVE: i8 = 0b0000_0010;
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static RANGE_EMPTY: i8 = 0b0000_0001;
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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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/// INT4[]
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PgInt4Array,
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/// INT8[]
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PgInt8Array,
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/// FLOAT4[]
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PgFloat4Array,
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/// FLOAT8[]
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PgFloat8Array,
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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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/// INT4RANGE
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PgInt4Range,
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/// INT8RANGE
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PgInt8Range,
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/// TSRANGE
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PgTsRange,
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/// TSTZRANGE
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PgTstzRange,
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/// An unknown type
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PgUnknownType {
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/// The name of the type
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name: ~str,
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/// The OID of the type
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oid: Oid
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}
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}
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impl PostgresType {
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#[doc(hidden)]
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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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INT4ARRAYOID => PgInt4Array,
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INT8ARRAYOID => PgInt8Array,
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FLOAT4ARRAYOID => PgFloat4Array,
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FLAOT8ARRAYOID => PgFloat8Array,
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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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INT4RANGEOID => PgInt4Range,
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INT8RANGEOID => PgInt8Range,
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TSRANGEOID => PgTsRange,
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TSTZRANGEOID => PgTstzRange,
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// We have to load an empty string now, it'll get filled in later
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oid => PgUnknownType { name: ~"", oid: 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 { name: ~"hstore", .. } => Binary,
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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 $actual {
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$(&$expected)|+ => (),
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actual => fail!("Invalid Postgres type {:?}", actual)
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}
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)
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)
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/// A trait for types that can be created from a Postgres value
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pub trait FromSql {
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/// Creates a new value of this type from a buffer of Postgres data.
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///
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/// If the value was `NULL`, the buffer will be `None`.
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///
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/// # Failure
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///
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/// Fails if this type can not be created from the provided Postgres type.
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fn from_sql(ty: &PostgresType, raw: &Option<~[u8]>) -> Self;
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}
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trait RawFromSql {
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fn raw_from_sql<R: Reader>(raw: &mut R) -> Self;
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}
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macro_rules! raw_from_impl(
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($t:ty, $f:ident) => (
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impl RawFromSql for $t {
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fn raw_from_sql<R: Reader>(raw: &mut R) -> $t {
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raw.$f()
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}
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}
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)
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)
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raw_from_impl!(i32, read_be_i32)
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raw_from_impl!(i64, read_be_i64)
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raw_from_impl!(f32, read_be_f32)
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raw_from_impl!(f64, read_be_f64)
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impl RawFromSql for Timespec {
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fn raw_from_sql<R: Reader>(raw: &mut R) -> Timespec {
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let t = raw.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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}
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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_raw_from_impl(
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($($expected:pat)|+, $t:ty) => (
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from_map_impl!($($expected)|+, $t, |buf| {
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let mut reader = BufReader::new(buf.as_slice());
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RawFromSql::raw_from_sql(&mut reader)
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})
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)
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)
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macro_rules! from_conversions_impl(
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($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_raw_from_impl!(PgInt4, i32)
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from_option_impl!(i32)
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from_raw_from_impl!(PgInt8, i64)
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from_option_impl!(i64)
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from_raw_from_impl!(PgFloat4, f32)
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from_option_impl!(f32)
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from_raw_from_impl!(PgFloat8, f64)
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from_option_impl!(f64)
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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_map_impl!(PgVarchar | PgText | PgCharN, ~str, |buf| {
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str::from_utf8_owned(buf.clone())
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})
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from_option_impl!(~str)
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from_map_impl!(PgByteA, ~[u8], |buf| {
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buf.clone()
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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(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_raw_from_impl!(PgTimestamp | PgTimestampZ, Timespec)
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from_option_impl!(Timespec)
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macro_rules! from_range_impl(
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($($oid:ident)|+, $t:ty) => (
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from_map_impl!($($oid)|+, Range<$t>, |buf| {
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let mut rdr = BufReader::new(buf.as_slice());
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let t = rdr.read_i8();
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if t & RANGE_EMPTY != 0 {
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Range::empty()
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} else {
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let lower = match t & RANGE_LOWER_UNBOUNDED {
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0 => {
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let type_ = match t & RANGE_LOWER_INCLUSIVE {
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0 => Exclusive,
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_ => Inclusive
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};
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rdr.read_be_i32();
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Some(RangeBound::new(RawFromSql::raw_from_sql(&mut rdr),
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type_))
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}
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_ => None
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};
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let upper = match t & RANGE_UPPER_UNBOUNDED {
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0 => {
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let type_ = match t & RANGE_UPPER_INCLUSIVE {
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0 => Exclusive,
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_ => Inclusive
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};
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rdr.read_be_i32();
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Some(RangeBound::new(RawFromSql::raw_from_sql(&mut rdr),
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type_))
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}
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_ => None
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};
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Range::new(lower, upper)
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}
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})
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)
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)
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from_range_impl!(PgInt4Range, i32)
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from_option_impl!(Range<i32>)
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from_range_impl!(PgInt8Range, i64)
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from_option_impl!(Range<i64>)
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from_range_impl!(PgTsRange | PgTstzRange, Timespec)
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from_option_impl!(Range<Timespec>)
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macro_rules! from_array_impl(
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($($oid:ident)|+, $t:ty) => (
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from_map_impl!($($oid)|+, ArrayBase<Option<$t>>, |buf| {
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let mut rdr = BufReader::new(buf.as_slice());
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let ndim = rdr.read_be_i32() as uint;
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let _has_null = rdr.read_be_i32() == 1;
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let _element_type: Oid = rdr.read_be_i32();
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let mut dim_info = vec::with_capacity(ndim);
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for _ in range(0, ndim) {
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dim_info.push(DimensionInfo {
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len: rdr.read_be_i32() as uint,
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lower_bound: rdr.read_be_i32() as int
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});
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}
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let nele = dim_info.iter().fold(1, |acc, info| acc * info.len);
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let mut elements = vec::with_capacity(nele);
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for _ in range(0, nele) {
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let len = rdr.read_be_i32();
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if len < 0 {
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elements.push(None);
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} else {
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elements.push(Some(RawFromSql::raw_from_sql(&mut rdr)));
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}
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}
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ArrayBase::from_raw(elements, dim_info)
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})
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)
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)
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from_array_impl!(PgInt4Array, i32)
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from_option_impl!(ArrayBase<Option<i32>>)
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from_array_impl!(PgInt8Array, i64)
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from_option_impl!(ArrayBase<Option<i64>>)
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from_array_impl!(PgFloat4Array, f32)
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from_option_impl!(ArrayBase<Option<f32>>)
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from_array_impl!(PgFloat8Array, f64)
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from_option_impl!(ArrayBase<Option<f64>>)
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from_map_impl!(PgUnknownType { name: ~"hstore", .. },
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HashMap<~str, Option<~str>>, |buf| {
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let mut rdr = BufReader::new(buf.as_slice());
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let mut map = HashMap::new();
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let count = rdr.read_be_i32();
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for _ in range(0, count) {
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let key_len = rdr.read_be_i32();
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let key = str::from_utf8_owned(rdr.read_bytes(key_len as uint));
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let val_len = rdr.read_be_i32();
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let val = if val_len < 0 {
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None
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} else {
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Some(str::from_utf8_owned(rdr.read_bytes(val_len as uint)))
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};
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map.insert(key, val);
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}
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map
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})
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from_option_impl!(HashMap<~str, Option<~str>>)
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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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trait RawToSql {
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fn raw_to_sql<W: Writer>(&self, w: &mut W);
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fn raw_size(&self) -> uint;
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}
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macro_rules! raw_to_impl(
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($t:ty, $f:ident) => (
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impl RawToSql for $t {
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fn raw_to_sql<W: Writer>(&self, w: &mut W) {
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w.$f(*self)
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}
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fn raw_size(&self) -> uint {
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mem::size_of::<$t>()
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}
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}
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)
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)
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raw_to_impl!(i32, write_be_i32)
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raw_to_impl!(i64, write_be_i64)
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raw_to_impl!(f32, write_be_f32)
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raw_to_impl!(f64, write_be_f64)
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impl RawToSql for Timespec {
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fn raw_to_sql<W: Writer>(&self, w: &mut W) {
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let t = (self.sec - TIME_SEC_CONVERSION) * USEC_PER_SEC
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+ self.nsec as i64 / NSEC_PER_USEC;
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w.write_be_i64(t);
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}
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fn raw_size(&self) -> uint {
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8
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}
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}
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macro_rules! to_option_impl(
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($($oid:pat)|+, $t:ty) => (
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impl ToSql for Option<$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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)
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macro_rules! to_option_impl_self(
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($($oid:pat)|+, $t:ty) => (
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impl<'self> ToSql for Option<$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_raw_to_impl(
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($($oid:ident)|+, $t:ty) => (
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impl ToSql for $t {
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fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
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check_types!($($oid)|+, ty)
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let mut writer = MemWriter::new();
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self.raw_to_sql(&mut writer);
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(Binary, Some(writer.inner()))
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}
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}
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)
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)
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macro_rules! to_conversions_impl(
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($($oid:ident)|+, $t:ty, $f:ident) => (
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impl ToSql for $t {
|
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fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!($($oid)|+, ty)
|
|
|
|
let mut writer = MemWriter::new();
|
|
writer.$f(*self);
|
|
(Binary, Some(writer.inner()))
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
impl ToSql for bool {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgBool, ty)
|
|
(Binary, Some(~[*self as u8]))
|
|
}
|
|
}
|
|
to_option_impl!(PgBool, bool)
|
|
|
|
to_raw_to_impl!(PgInt4, i32)
|
|
to_option_impl!(PgInt4, i32)
|
|
to_raw_to_impl!(PgInt8, i64)
|
|
to_option_impl!(PgInt8, i64)
|
|
to_raw_to_impl!(PgFloat4, f32)
|
|
to_option_impl!(PgFloat4, f32)
|
|
to_raw_to_impl!(PgFloat8, f64)
|
|
to_option_impl!(PgFloat8, f64)
|
|
|
|
to_conversions_impl!(PgChar, i8, write_i8)
|
|
to_option_impl!(PgChar, i8)
|
|
to_conversions_impl!(PgInt2, i16, write_be_i16)
|
|
to_option_impl!(PgInt2, i16)
|
|
|
|
impl ToSql for ~str {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgVarchar | PgText | PgCharN, ty)
|
|
(Text, Some(self.as_bytes().to_owned()))
|
|
}
|
|
}
|
|
|
|
impl<'self> ToSql for &'self str {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgVarchar | PgText | PgCharN, ty)
|
|
(Text, Some(self.as_bytes().to_owned()))
|
|
}
|
|
}
|
|
|
|
to_option_impl!(PgVarchar | PgText | PgCharN, ~str)
|
|
to_option_impl_self!(PgVarchar | PgText | PgCharN, &'self str)
|
|
|
|
impl ToSql for ~[u8] {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgByteA, ty)
|
|
(Binary, Some(self.to_owned()))
|
|
}
|
|
}
|
|
|
|
impl<'self> ToSql for &'self [u8] {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgByteA, ty)
|
|
(Binary, Some(self.to_owned()))
|
|
}
|
|
}
|
|
|
|
to_option_impl!(PgByteA, ~[u8])
|
|
to_option_impl_self!(PgByteA, &'self [u8])
|
|
|
|
impl ToSql for Json {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgJson, ty)
|
|
(Text, Some(self.to_str().into_bytes()))
|
|
}
|
|
}
|
|
|
|
to_option_impl!(PgJson, Json)
|
|
|
|
impl ToSql for Uuid {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgUuid, ty)
|
|
(Binary, Some(self.to_bytes().to_owned()))
|
|
}
|
|
}
|
|
|
|
to_option_impl!(PgUuid, Uuid)
|
|
|
|
to_raw_to_impl!(PgTimestamp | PgTimestampZ, Timespec)
|
|
to_option_impl!(PgTimestamp | PgTimestampZ, Timespec)
|
|
|
|
macro_rules! to_range_impl(
|
|
($($oid:ident)|+, $t:ty) => (
|
|
impl ToSql for Range<$t> {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!($($oid)|+, ty)
|
|
let mut buf = MemWriter::new();
|
|
|
|
let mut tag = 0;
|
|
if self.is_empty() {
|
|
tag |= RANGE_EMPTY;
|
|
} else {
|
|
match *self.lower() {
|
|
None => tag |= RANGE_LOWER_UNBOUNDED,
|
|
Some(RangeBound { type_: Inclusive, .. }) =>
|
|
tag |= RANGE_LOWER_INCLUSIVE,
|
|
_ => {}
|
|
}
|
|
match *self.upper() {
|
|
None => tag |= RANGE_UPPER_UNBOUNDED,
|
|
Some(RangeBound { type_: Inclusive, .. }) =>
|
|
tag |= RANGE_UPPER_INCLUSIVE,
|
|
_ => {}
|
|
}
|
|
}
|
|
|
|
buf.write_i8(tag);
|
|
|
|
match *self.lower() {
|
|
Some(ref bound) => {
|
|
buf.write_be_i32(bound.value.raw_size() as i32);
|
|
bound.value.raw_to_sql(&mut buf);
|
|
}
|
|
None => {}
|
|
}
|
|
match *self.upper() {
|
|
Some(ref bound) => {
|
|
buf.write_be_i32(bound.value.raw_size() as i32);
|
|
bound.value.raw_to_sql(&mut buf);
|
|
}
|
|
None => {}
|
|
}
|
|
|
|
(Binary, Some(buf.inner()))
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
to_range_impl!(PgInt4Range, i32)
|
|
to_option_impl!(PgInt4Range, Range<i32>)
|
|
|
|
to_range_impl!(PgInt8Range, i64)
|
|
to_option_impl!(PgInt8Range, Range<i64>)
|
|
|
|
to_range_impl!(PgTsRange | PgTstzRange, Timespec)
|
|
to_option_impl!(PgTsRange | PgTstzRange, Range<Timespec>)
|
|
|
|
macro_rules! to_array_impl(
|
|
($($oid:ident)|+, $base_oid:ident, $t:ty) => (
|
|
impl ToSql for ArrayBase<Option<$t>> {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!($($oid)|+, ty)
|
|
let mut buf = MemWriter::new();
|
|
|
|
buf.write_be_i32(self.dimension_info().len() as i32);
|
|
buf.write_be_i32(1);
|
|
buf.write_be_i32($base_oid);
|
|
|
|
for info in self.dimension_info().iter() {
|
|
buf.write_be_i32(info.len as i32);
|
|
buf.write_be_i32(info.lower_bound as i32);
|
|
}
|
|
|
|
for v in self.values() {
|
|
match *v {
|
|
Some(ref val) => {
|
|
buf.write_be_i32(val.raw_size() as i32);
|
|
val.raw_to_sql(&mut buf);
|
|
}
|
|
None => buf.write_be_i32(-1)
|
|
}
|
|
}
|
|
|
|
(Binary, Some(buf.inner()))
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
to_array_impl!(PgInt4Array, INT4OID, i32)
|
|
to_option_impl!(PgInt4Array, ArrayBase<Option<i32>>)
|
|
|
|
to_array_impl!(PgInt8Array, INT8OID, i64)
|
|
to_option_impl!(PgInt8Array, ArrayBase<Option<i64>>)
|
|
|
|
to_array_impl!(PgFloat4Array, FLOAT4OID, f32)
|
|
to_option_impl!(PgFloat4Array, ArrayBase<Option<f32>>)
|
|
|
|
to_array_impl!(PgFloat8Array, FLOAT8OID, f64)
|
|
to_option_impl!(PgFloat8Array, ArrayBase<Option<f64>>)
|
|
|
|
impl<'self> ToSql for HashMap<~str, Option<~str>> {
|
|
fn to_sql(&self, ty: &PostgresType) -> (Format, Option<~[u8]>) {
|
|
check_types!(PgUnknownType { name: ~"hstore", .. }, ty)
|
|
let mut buf = MemWriter::new();
|
|
|
|
buf.write_be_i32(self.len() as i32);
|
|
|
|
for (key, val) in self.iter() {
|
|
buf.write_be_i32(key.len() as i32);
|
|
buf.write(key.as_bytes());
|
|
|
|
match *val {
|
|
Some(ref val) => {
|
|
buf.write_be_i32(val.len() as i32);
|
|
buf.write(val.as_bytes());
|
|
}
|
|
None => buf.write_be_i32(-1)
|
|
}
|
|
}
|
|
|
|
(Binary, Some(buf.inner()))
|
|
}
|
|
}
|
|
to_option_impl!(PgUnknownType { name: ~"hstore", .. },
|
|
HashMap<~str, Option<~str>>)
|