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//! pgwire result encoding — `QueryResult` -> wire frames and the
//! `Value`/`DataType` -> `WireValue`/`WireType` conversions. Lifted
//! out of `main.rs` (server file split).
use std::io::Write;
use std::net::TcpStream;
use spg_engine::{EngineError, QueryResult};
use spg_storage::{ColumnSchema, DataType, Row, Value};
use spg_wire::{
ColumnDesc, Frame, WireType, WireValue, build_command_complete, build_data_row,
build_data_row_batch, build_error_response, build_row_description, encode,
};
use crate::BATCH_ROWS_PER_FRAME;
pub(crate) fn emit_result(
stream: &mut TcpStream,
result: Result<QueryResult, EngineError>,
) -> std::io::Result<()> {
match result {
Ok(QueryResult::CommandOk { affected, .. }) => {
write_frame(stream, &build_command_complete(affected as u64))
}
Ok(QueryResult::Rows { columns, rows }) => {
// v3.3.1: encode the entire response (RowDescription +
// DataRowBatch chunks + CommandComplete) into one Vec<u8>
// then a single write_all. Saves 2 syscalls per SELECT vs
// the old 3-write_frame path.
let descs = columns
.iter()
.map(column_schema_to_desc)
.collect::<Vec<_>>();
let rd =
build_row_description(&descs).map_err(|e| std::io::Error::other(e.to_string()))?;
let mut out: Vec<u8> = Vec::with_capacity(
spg_wire::FRAME_HEADER_LEN + rd.payload.len() + rows.len() * 64 + 16,
);
encode(&rd, &mut out).map_err(|e| std::io::Error::other(e.to_string()))?;
// v7.15.0 — column types thread through the wire path
// so TIMESTAMPTZ can render with PG-canonical `+00`
// offset, distinguishing it from plain TIMESTAMP.
// Both are stored as i64 microseconds UTC; the type
// tag is the only thing that says "include offset".
let col_types: Vec<DataType> = columns.iter().map(|c| c.ty).collect();
if rows.len() <= 1 {
for row in rows {
let wire = row_to_wire_with_types(&row, &col_types);
let frame =
build_data_row(&wire).map_err(|e| std::io::Error::other(e.to_string()))?;
encode(&frame, &mut out).map_err(|e| std::io::Error::other(e.to_string()))?;
}
} else {
let wire_rows: Vec<Vec<WireValue>> = rows
.iter()
.map(|r| row_to_wire_with_types(r, &col_types))
.collect();
for chunk in wire_rows.chunks(BATCH_ROWS_PER_FRAME) {
let frame = build_data_row_batch(chunk)
.map_err(|e| std::io::Error::other(e.to_string()))?;
encode(&frame, &mut out).map_err(|e| std::io::Error::other(e.to_string()))?;
}
}
let cc = build_command_complete(0);
encode(&cc, &mut out).map_err(|e| std::io::Error::other(e.to_string()))?;
stream.write_all(&out)
}
Err(e) => write_frame(stream, &build_error_response(&e.to_string())),
// v7.5.0 — QueryResult is #[non_exhaustive].
Ok(_) => write_frame(
stream,
&build_error_response("unexpected QueryResult variant"),
),
}
}
fn column_schema_to_desc(c: &ColumnSchema) -> ColumnDesc {
ColumnDesc {
name: c.name.clone(),
ty: data_type_to_wire(c.ty),
nullable: c.nullable,
}
}
const fn data_type_to_wire(t: DataType) -> WireType {
match t {
// v1.11 surfaces SMALLINT as INT on the wire — the wire layer
// doesn't (yet) carry a separate 16-bit tag, and PG drivers
// happily render an i32 for any narrower integer column.
DataType::SmallInt | DataType::Int => WireType::Int,
DataType::BigInt => WireType::BigInt,
DataType::Float => WireType::Float,
// VARCHAR / CHAR / NUMERIC / DATE / TIMESTAMP collapse to
// TEXT on the wire. Schema tracks bounds and precision; values
// are plain UTF-8 in their canonical text forms.
DataType::Text
| DataType::Varchar(_)
| DataType::Char(_)
| DataType::Numeric { .. }
| DataType::Date
| DataType::Timestamp
| DataType::Timestamptz
| DataType::Interval
| DataType::Json
| DataType::Jsonb
// v7.10.4 — BYTEA serialises to Text on the wire as the
// PG hex form (`\xDEADBEEF`). pg_type OID 17 is set
// elsewhere via `pg_type_oid`; the WireType collapses
// to the catch-all Text path so the existing encoder
// emits the hex-formatted body.
| DataType::Bytes
// v7.10.9 — TEXT[] collapses to Text on the wire as the
// PG external array form `{a,b,NULL}`. OID 1009 is set
// via `pg_type_oid`. Binary array format lands in v7.12+.
| DataType::TextArray
// v7.11.12 — INT[] / BIGINT[] same text-mode collapse;
// OIDs 1007 / 1016 via `pg_type_oid`.
| DataType::IntArray
| DataType::BigIntArray
// v7.12.0 — tsvector / tsquery collapse to Text on the
// wire; OIDs 3614 / 3615 advertised via `pg_type_oid`.
| DataType::TsVector
| DataType::TsQuery
// v7.17.0 — UUID collapses to Text on the wire as the
// canonical 8-4-4-4-12 lowercase hyphenated form. PG
// OID 2950 is advertised via `pg_type_oid`; binary
// 16-byte format lands when binary-format clients
// arrive.
| DataType::Uuid
// v7.17.0 Phase 3.P0-32 — TIME collapses to Text on the
// wire as canonical `HH:MM:SS[.ffffff]`. PG OID 1083
// advertised via `pg_type_oid`.
| DataType::Time
// v7.17.0 Phase 3.P0-33 — YEAR collapses to Text on the
// wire as 4-digit zero-padded. Pgwire advertises as
// INT4 OID; integer clients still parse it cleanly.
| DataType::Year
// v7.17.0 Phase 3.P0-34 — TIMETZ collapses to Text on
// the wire as `HH:MM:SS[.ffffff]±HH[:MM]`. PG OID 1266
// advertised via `pg_type_oid`.
| DataType::TimeTz
// v7.17.0 Phase 3.P0-35 — MONEY collapses to Text on
// the wire as canonical `$N,NNN.CC`. PG OID 790
// advertised via `pg_type_oid`.
| DataType::Money
// v7.17.0 Phase 3.P0-38 — range types collapse to Text
// on the wire as canonical `[a,b)` / `(a,b]` form. PG
// OIDs (3904/3926/...) advertised via `pg_type_oid`.
| DataType::Range(_)
// v7.17.0 Phase 3.P0-39 — hstore collapses to Text on
// the wire as canonical `"k"=>"v"` form.
| DataType::Hstore
// v7.17.0 Phase 3.P0-40 — 2D arrays collapse to Text on
// the wire as nested `'{{a,b},{c,d}}'` form.
| DataType::IntArray2D
| DataType::BigIntArray2D
| DataType::TextArray2D => WireType::Text,
DataType::Bool => WireType::Bool,
// RowDescription drops the dimension; DataRow's WireValue::Vector
// carries the actual element count back to the client.
DataType::Vector { .. } => WireType::Vector,
}
}
/// v7.15.0 — column-type-aware wire conversion. Used wherever a
/// SELECT result needs to distinguish TIMESTAMP from TIMESTAMPTZ
/// at render time (canonical PG output includes `+00` for
/// TIMESTAMPTZ). Both share the i64 microseconds UTC on-disk
/// shape; the type-tag is what flips the renderer.
fn row_to_wire_with_types(r: &Row, col_types: &[DataType]) -> Vec<WireValue> {
r.values
.iter()
.zip(col_types.iter())
.map(|(v, ty)| value_to_wire_typed(v, *ty))
.collect()
}
fn value_to_wire_typed(v: &Value, ty: DataType) -> WireValue {
match (v, ty) {
(Value::Timestamp(t), DataType::Timestamptz) => {
WireValue::Text(spg_engine::eval::format_timestamptz(*t))
}
_ => value_to_wire(v),
}
}
fn value_to_wire(v: &Value) -> WireValue {
match v {
Value::Null => WireValue::Null,
// SMALLINT widens to wire INT — drivers see a plain i32.
Value::SmallInt(n) => WireValue::Int(i32::from(*n)),
Value::Int(n) => WireValue::Int(*n),
Value::BigInt(n) => WireValue::BigInt(*n),
Value::Float(x) => WireValue::Float(*x),
// v4.9: TEXT and JSON ride the wire identically — the
// client's column type (RowDescription OID) carries the
// "this is JSON" semantic.
Value::Text(s) | Value::Json(s) => WireValue::Text(s.clone()),
Value::Bool(b) => WireValue::Bool(*b),
Value::Vector(v) => WireValue::Vector(v.clone()),
// v6.0.1: SQ8 cells dequantise to f32 on the wire so
// pgwire clients (psql, drivers, the conformance corpora)
// see the same `WireValue::Vector` shape regardless of
// the column's storage encoding. Recall envelope absorbs
// the ≤ (max-min)/255/2 dequantisation error.
Value::Sq8Vector(q) => WireValue::Vector(spg_storage::quantize::dequantize(q)),
// v6.0.3: HalfVector cells decode bit-exactly back to f32.
Value::HalfVector(h) => WireValue::Vector(h.to_f32_vec()),
// NUMERIC / DATE / TIMESTAMP render as their canonical
// text form on the wire. Drivers receive plain UTF-8,
// identical to what `value_to_text` produces in the engine.
Value::Numeric { scaled, scale } => {
WireValue::Text(spg_engine::eval::format_numeric(*scaled, *scale))
}
Value::Date(d) => WireValue::Text(spg_engine::eval::format_date(*d)),
Value::Timestamp(t) => WireValue::Text(spg_engine::eval::format_timestamp(*t)),
Value::Interval { months, micros } => {
WireValue::Text(spg_engine::eval::format_interval(*months, *micros))
}
// v7.10.4 — BYTEA goes on the wire as PG hex text
// (`\x` + lowercase hex). RowDescription advertises OID 17
// (`pg_type_oid` covers that), and PG text-mode clients
// expect this exact format. Binary-mode (sqlx/pgx Bind)
// path lands when the wire layer grows BYTEA binary
// codec — for now binary fetches surface as the hex text
// and clients decode normally.
Value::Bytes(b) => WireValue::Text(spg_engine::eval::format_bytea_hex(b)),
// v7.10.9 — TEXT[] goes on the wire as PG external array
// form (`{a,b,NULL}`). RowDescription advertises OID 1009.
Value::TextArray(items) => WireValue::Text(spg_engine::eval::format_text_array(items)),
// v7.11.14 — INT[] / BIGINT[] external form `{1,2,NULL}`.
// RowDescription advertises OIDs 1007 / 1016.
Value::IntArray(items) => WireValue::Text(spg_engine::eval::format_int_array(items)),
Value::BigIntArray(items) => WireValue::Text(spg_engine::eval::format_bigint_array(items)),
// v7.12.0 — tsvector / tsquery on the wire as PG external
// form. RowDescription OIDs 3614 / 3615 via `pg_type_oid`.
Value::TsVector(lexs) => WireValue::Text(spg_engine::eval::format_tsvector(lexs)),
Value::TsQuery(ast) => WireValue::Text(spg_engine::eval::format_tsquery(ast)),
// v7.5.0 — Value is #[non_exhaustive].
_ => WireValue::Text(format!("{v:?}")),
}
}
pub(crate) fn write_frame(stream: &mut TcpStream, frame: &Frame) -> std::io::Result<()> {
let mut out = Vec::with_capacity(32);
encode(frame, &mut out).map_err(|e| std::io::Error::other(e.to_string()))?;
stream.write_all(&out)
}