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