Line data Source code
1 : use std::future::Future;
2 : use std::pin::Pin;
3 : use std::sync::Arc;
4 :
5 : use bytes::Bytes;
6 : use fallible_iterator::FallibleIterator;
7 : use futures_util::{TryStreamExt, pin_mut};
8 : use log::debug;
9 : use postgres_protocol2::message::backend::Message;
10 : use postgres_protocol2::message::frontend;
11 :
12 : use crate::client::InnerClient;
13 : use crate::codec::FrontendMessage;
14 : use crate::connection::RequestMessages;
15 : use crate::types::{Field, Kind, Oid, Type};
16 : use crate::{Column, Error, Statement, query, slice_iter};
17 :
18 : pub(crate) const TYPEINFO_QUERY: &str = "\
19 : SELECT t.typname, t.typtype, t.typelem, r.rngsubtype, t.typbasetype, n.nspname, t.typrelid
20 : FROM pg_catalog.pg_type t
21 : LEFT OUTER JOIN pg_catalog.pg_range r ON r.rngtypid = t.oid
22 : INNER JOIN pg_catalog.pg_namespace n ON t.typnamespace = n.oid
23 : WHERE t.oid = $1
24 : ";
25 :
26 : const TYPEINFO_ENUM_QUERY: &str = "\
27 : SELECT enumlabel
28 : FROM pg_catalog.pg_enum
29 : WHERE enumtypid = $1
30 : ORDER BY enumsortorder
31 : ";
32 :
33 : pub(crate) const TYPEINFO_COMPOSITE_QUERY: &str = "\
34 : SELECT attname, atttypid
35 : FROM pg_catalog.pg_attribute
36 : WHERE attrelid = $1
37 : AND NOT attisdropped
38 : AND attnum > 0
39 : ORDER BY attnum
40 : ";
41 :
42 0 : pub async fn prepare(
43 0 : client: &Arc<InnerClient>,
44 0 : name: &'static str,
45 0 : query: &str,
46 0 : types: &[Type],
47 0 : ) -> Result<Statement, Error> {
48 0 : let buf = encode(client, name, query, types)?;
49 0 : let mut responses = client.send(RequestMessages::Single(FrontendMessage::Raw(buf)))?;
50 :
51 0 : match responses.next().await? {
52 0 : Message::ParseComplete => {}
53 0 : _ => return Err(Error::unexpected_message()),
54 : }
55 :
56 0 : let parameter_description = match responses.next().await? {
57 0 : Message::ParameterDescription(body) => body,
58 0 : _ => return Err(Error::unexpected_message()),
59 : };
60 :
61 0 : let row_description = match responses.next().await? {
62 0 : Message::RowDescription(body) => Some(body),
63 0 : Message::NoData => None,
64 0 : _ => return Err(Error::unexpected_message()),
65 : };
66 :
67 0 : let mut parameters = vec![];
68 0 : let mut it = parameter_description.parameters();
69 0 : while let Some(oid) = it.next().map_err(Error::parse)? {
70 0 : let type_ = get_type(client, oid).await?;
71 0 : parameters.push(type_);
72 : }
73 :
74 0 : let mut columns = vec![];
75 0 : if let Some(row_description) = row_description {
76 0 : let mut it = row_description.fields();
77 0 : while let Some(field) = it.next().map_err(Error::parse)? {
78 0 : let type_ = get_type(client, field.type_oid()).await?;
79 0 : let column = Column::new(field.name().to_string(), type_, field);
80 0 : columns.push(column);
81 : }
82 0 : }
83 :
84 0 : Ok(Statement::new(client, name, parameters, columns))
85 0 : }
86 :
87 0 : fn prepare_rec<'a>(
88 0 : client: &'a Arc<InnerClient>,
89 0 : name: &'static str,
90 0 : query: &'a str,
91 0 : types: &'a [Type],
92 0 : ) -> Pin<Box<dyn Future<Output = Result<Statement, Error>> + 'a + Send>> {
93 0 : Box::pin(prepare(client, name, query, types))
94 0 : }
95 :
96 0 : fn encode(client: &InnerClient, name: &str, query: &str, types: &[Type]) -> Result<Bytes, Error> {
97 0 : if types.is_empty() {
98 0 : debug!("preparing query {}: {}", name, query);
99 : } else {
100 0 : debug!("preparing query {} with types {:?}: {}", name, types, query);
101 : }
102 :
103 0 : client.with_buf(|buf| {
104 0 : frontend::parse(name, query, types.iter().map(Type::oid), buf).map_err(Error::encode)?;
105 0 : frontend::describe(b'S', name, buf).map_err(Error::encode)?;
106 0 : frontend::sync(buf);
107 0 : Ok(buf.split().freeze())
108 0 : })
109 0 : }
110 :
111 0 : pub async fn get_type(client: &Arc<InnerClient>, oid: Oid) -> Result<Type, Error> {
112 0 : if let Some(type_) = Type::from_oid(oid) {
113 0 : return Ok(type_);
114 0 : }
115 :
116 0 : if let Some(type_) = client.type_(oid) {
117 0 : return Ok(type_);
118 0 : }
119 :
120 0 : let stmt = typeinfo_statement(client).await?;
121 :
122 0 : let rows = query::query(client, stmt, slice_iter(&[&oid])).await?;
123 0 : pin_mut!(rows);
124 :
125 0 : let row = match rows.try_next().await? {
126 0 : Some(row) => row,
127 0 : None => return Err(Error::unexpected_message()),
128 : };
129 :
130 0 : let name: String = row.try_get(0)?;
131 0 : let type_: i8 = row.try_get(1)?;
132 0 : let elem_oid: Oid = row.try_get(2)?;
133 0 : let rngsubtype: Option<Oid> = row.try_get(3)?;
134 0 : let basetype: Oid = row.try_get(4)?;
135 0 : let schema: String = row.try_get(5)?;
136 0 : let relid: Oid = row.try_get(6)?;
137 :
138 0 : let kind = if type_ == b'e' as i8 {
139 0 : let variants = get_enum_variants(client, oid).await?;
140 0 : Kind::Enum(variants)
141 0 : } else if type_ == b'p' as i8 {
142 0 : Kind::Pseudo
143 0 : } else if basetype != 0 {
144 0 : let type_ = get_type_rec(client, basetype).await?;
145 0 : Kind::Domain(type_)
146 0 : } else if elem_oid != 0 {
147 0 : let type_ = get_type_rec(client, elem_oid).await?;
148 0 : Kind::Array(type_)
149 0 : } else if relid != 0 {
150 0 : let fields = get_composite_fields(client, relid).await?;
151 0 : Kind::Composite(fields)
152 0 : } else if let Some(rngsubtype) = rngsubtype {
153 0 : let type_ = get_type_rec(client, rngsubtype).await?;
154 0 : Kind::Range(type_)
155 : } else {
156 0 : Kind::Simple
157 : };
158 :
159 0 : let type_ = Type::new(name, oid, kind, schema);
160 0 : client.set_type(oid, &type_);
161 0 :
162 0 : Ok(type_)
163 0 : }
164 :
165 0 : fn get_type_rec<'a>(
166 0 : client: &'a Arc<InnerClient>,
167 0 : oid: Oid,
168 0 : ) -> Pin<Box<dyn Future<Output = Result<Type, Error>> + Send + 'a>> {
169 0 : Box::pin(get_type(client, oid))
170 0 : }
171 :
172 0 : async fn typeinfo_statement(client: &Arc<InnerClient>) -> Result<Statement, Error> {
173 0 : if let Some(stmt) = client.typeinfo() {
174 0 : return Ok(stmt);
175 0 : }
176 0 :
177 0 : let typeinfo = "neon_proxy_typeinfo";
178 0 : let stmt = prepare_rec(client, typeinfo, TYPEINFO_QUERY, &[]).await?;
179 :
180 0 : client.set_typeinfo(&stmt);
181 0 : Ok(stmt)
182 0 : }
183 :
184 0 : async fn get_enum_variants(client: &Arc<InnerClient>, oid: Oid) -> Result<Vec<String>, Error> {
185 0 : let stmt = typeinfo_enum_statement(client).await?;
186 :
187 0 : query::query(client, stmt, slice_iter(&[&oid]))
188 0 : .await?
189 0 : .and_then(|row| async move { row.try_get(0) })
190 0 : .try_collect()
191 0 : .await
192 0 : }
193 :
194 0 : async fn typeinfo_enum_statement(client: &Arc<InnerClient>) -> Result<Statement, Error> {
195 0 : if let Some(stmt) = client.typeinfo_enum() {
196 0 : return Ok(stmt);
197 0 : }
198 0 :
199 0 : let typeinfo = "neon_proxy_typeinfo_enum";
200 0 : let stmt = prepare_rec(client, typeinfo, TYPEINFO_ENUM_QUERY, &[]).await?;
201 :
202 0 : client.set_typeinfo_enum(&stmt);
203 0 : Ok(stmt)
204 0 : }
205 :
206 0 : async fn get_composite_fields(client: &Arc<InnerClient>, oid: Oid) -> Result<Vec<Field>, Error> {
207 0 : let stmt = typeinfo_composite_statement(client).await?;
208 :
209 0 : let rows = query::query(client, stmt, slice_iter(&[&oid]))
210 0 : .await?
211 0 : .try_collect::<Vec<_>>()
212 0 : .await?;
213 :
214 0 : let mut fields = vec![];
215 0 : for row in rows {
216 0 : let name = row.try_get(0)?;
217 0 : let oid = row.try_get(1)?;
218 0 : let type_ = get_type_rec(client, oid).await?;
219 0 : fields.push(Field::new(name, type_));
220 : }
221 :
222 0 : Ok(fields)
223 0 : }
224 :
225 0 : async fn typeinfo_composite_statement(client: &Arc<InnerClient>) -> Result<Statement, Error> {
226 0 : if let Some(stmt) = client.typeinfo_composite() {
227 0 : return Ok(stmt);
228 0 : }
229 0 :
230 0 : let typeinfo = "neon_proxy_typeinfo_composite";
231 0 : let stmt = prepare_rec(client, typeinfo, TYPEINFO_COMPOSITE_QUERY, &[]).await?;
232 :
233 0 : client.set_typeinfo_composite(&stmt);
234 0 : Ok(stmt)
235 0 : }
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