opendal/services/persy/
backend.rs1use std::fmt::Debug;
19use std::fmt::Formatter;
20use std::str;
21
22use persy;
23
24use crate::Builder;
25use crate::Error;
26use crate::ErrorKind;
27use crate::Scheme;
28use crate::raw::adapters::kv;
29use crate::raw::*;
30use crate::services::PersyConfig;
31use crate::*;
32
33#[doc = include_str!("docs.md")]
35#[derive(Default, Debug)]
36pub struct PersyBuilder {
37 pub(super) config: PersyConfig,
38}
39
40impl PersyBuilder {
41 pub fn datafile(mut self, path: &str) -> Self {
43 self.config.datafile = Some(path.into());
44 self
45 }
46
47 pub fn segment(mut self, path: &str) -> Self {
49 self.config.segment = Some(path.into());
50 self
51 }
52
53 pub fn index(mut self, path: &str) -> Self {
55 self.config.index = Some(path.into());
56 self
57 }
58}
59
60impl Builder for PersyBuilder {
61 type Config = PersyConfig;
62
63 fn build(self) -> Result<impl Access> {
64 let datafile_path = self.config.datafile.ok_or_else(|| {
65 Error::new(ErrorKind::ConfigInvalid, "datafile is required but not set")
66 .with_context("service", Scheme::Persy)
67 })?;
68
69 let segment_name = self.config.segment.ok_or_else(|| {
70 Error::new(ErrorKind::ConfigInvalid, "segment is required but not set")
71 .with_context("service", Scheme::Persy)
72 })?;
73
74 let segment = segment_name.clone();
75
76 let index_name = self.config.index.ok_or_else(|| {
77 Error::new(ErrorKind::ConfigInvalid, "index is required but not set")
78 .with_context("service", Scheme::Persy)
79 })?;
80
81 let index = index_name.clone();
82
83 let persy = persy::OpenOptions::new()
84 .create(true)
85 .prepare_with(move |p| init(p, &segment_name, &index_name))
86 .open(&datafile_path)
87 .map_err(|e| {
88 Error::new(ErrorKind::ConfigInvalid, "open db")
89 .with_context("service", Scheme::Persy)
90 .with_context("datafile", datafile_path.clone())
91 .set_source(e)
92 })?;
93
94 fn init(
96 persy: &persy::Persy,
97 segment_name: &str,
98 index_name: &str,
99 ) -> Result<(), Box<dyn std::error::Error>> {
100 let mut tx = persy.begin()?;
101
102 if !tx.exists_segment(segment_name)? {
103 tx.create_segment(segment_name)?;
104 }
105 if !tx.exists_index(index_name)? {
106 tx.create_index::<String, persy::PersyId>(index_name, persy::ValueMode::Replace)?;
107 }
108
109 let prepared = tx.prepare()?;
110 prepared.commit()?;
111
112 Ok(())
113 }
114
115 Ok(PersyBackend::new(Adapter {
116 datafile: datafile_path,
117 segment,
118 index,
119 persy,
120 }))
121 }
122}
123
124pub type PersyBackend = kv::Backend<Adapter>;
126
127#[derive(Clone)]
128pub struct Adapter {
129 datafile: String,
130 segment: String,
131 index: String,
132 persy: persy::Persy,
133}
134
135impl Debug for Adapter {
136 fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
137 let mut ds = f.debug_struct("Adapter");
138 ds.field("path", &self.datafile);
139 ds.field("segment", &self.segment);
140 ds.field("index", &self.index);
141 ds.finish()
142 }
143}
144
145impl kv::Adapter for Adapter {
146 type Scanner = ();
147
148 fn info(&self) -> kv::Info {
149 kv::Info::new(
150 Scheme::Persy,
151 &self.datafile,
152 Capability {
153 read: true,
154 write: true,
155 delete: true,
156 shared: false,
157 ..Default::default()
158 },
159 )
160 }
161
162 async fn get(&self, path: &str) -> Result<Option<Buffer>> {
163 let mut read_id = self
164 .persy
165 .get::<String, persy::PersyId>(&self.index, &path.to_string())
166 .map_err(parse_error)?;
167 if let Some(id) = read_id.next() {
168 let value = self.persy.read(&self.segment, &id).map_err(parse_error)?;
169 return Ok(value.map(Buffer::from));
170 }
171
172 Ok(None)
173 }
174
175 async fn set(&self, path: &str, value: Buffer) -> Result<()> {
176 let mut tx = self.persy.begin().map_err(parse_error)?;
177 let id = tx
178 .insert(&self.segment, &value.to_vec())
179 .map_err(parse_error)?;
180
181 tx.put::<String, persy::PersyId>(&self.index, path.to_string(), id)
182 .map_err(parse_error)?;
183 let prepared = tx.prepare().map_err(parse_error)?;
184 prepared.commit().map_err(parse_error)?;
185
186 Ok(())
187 }
188
189 async fn delete(&self, path: &str) -> Result<()> {
190 let mut delete_id = self
191 .persy
192 .get::<String, persy::PersyId>(&self.index, &path.to_string())
193 .map_err(parse_error)?;
194 if let Some(id) = delete_id.next() {
195 let mut tx = self.persy.begin().map_err(parse_error)?;
197 tx.delete(&self.segment, &id).map_err(parse_error)?;
199 tx.remove::<String, persy::PersyId>(&self.index, path.to_string(), Some(id))
201 .map_err(parse_error)?;
202 let prepared = tx.prepare().map_err(parse_error)?;
204 prepared.commit().map_err(parse_error)?;
205 }
206
207 Ok(())
208 }
209}
210
211fn parse_error<T: Into<persy::PersyError>>(err: persy::PE<T>) -> Error {
212 let err: persy::PersyError = err.persy_error();
213 let kind = match err {
214 persy::PersyError::RecordNotFound(_) => ErrorKind::NotFound,
215 _ => ErrorKind::Unexpected,
216 };
217
218 Error::new(kind, "error from persy").set_source(err)
219}