1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
#[macro_use]
extern crate anyhow;
use anyhow::Result;
use blake2::{Blake2b, Digest};
use rusqlite::{params, Connection};
use std::io;
use std::path::Path;
/// Return a hex-encoded string representing the contents of `hash`.
fn hexlify(hash: &[u8]) -> String {
hash.iter()
.map(|b| format!("{:x}", b))
.collect::<Vec<String>>()
.join("")
}
#[derive(Debug)]
struct TagBase {
conn: Connection,
}
fn hash_file(path: &Path) -> Result<String> {
let mut file = std::fs::File::open(path)?;
let mut hasher = Blake2b::new();
let _ = io::copy(&mut file, &mut hasher)?;
Ok(base64::encode(&hasher.result()))
}
impl TagBase {
/// Instantiate a new `TagBase` whose backing database is at `path`.
pub fn new(path: &str) -> Result<Self> {
let tb = TagBase {
conn: Connection::open(path)?,
};
tb.initialize_tables()?;
Ok(tb)
}
fn make_temporary() -> Result<Self> {
let tb = TagBase {
conn: Connection::open_in_memory()?,
};
tb.initialize_tables()?;
Ok(tb)
}
/// Create the table structure for the tag database.
fn initialize_tables(&self) -> Result<()> {
self.conn.execute(
"CREATE TABLE IF NOT EXISTS images (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
blake2 TEXT NOT NULL,
filename TEXT NOT NULL,
orig_dir TEXT NOT NULL
)",
params![],
)?;
self.conn.execute(
"CREATE TABLE IF NOT EXISTS tags (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
name TEXT NOT NULL
)",
params![],
)?;
self.conn.execute(
"CREATE TABLE IF NOT EXISTS mapping (
image INTEGER NOT NULL,
tag INTEGER NOT NULL
)",
params![],
)?;
Ok(())
}
/// Insert the image at `path` into the data.
fn import_image(&self, path: &Path, hash: &str) -> Result<i64> {
if path.is_dir() {
bail!("`path` does not name a file.");
}
let file_name = path
.file_name()
.and_then(|os| os.to_str())
.ok_or(anyhow!("Couldn't parse file name."))?;
let path = path.to_str().ok_or(anyhow!("Couldn't parse path."))?;
let split_index = path.len() - file_name.len();
let parent_directory = &path[0..split_index];
let id = self
.conn
.prepare("INSERT INTO images (blake2, filename, orig_dir) VALUES(?,?,?)")?
.insert(params![hash, file_name, parent_directory])?;
Ok(id)
}
/// Insert `tag` into the database, if it does not already exist.
fn add_tag(&self, tag: &str) -> Result<()> {
let exists = self
.conn
.prepare("SELECT * FROM tags WHERE name = ?")?
.exists(params![tag]);
if let Err(_) = exists {
self.conn
.execute("INSERT INTO tags (name) VALUES(?)", params![tag])?;
}
Ok(())
}
/// Associate `tag` with the image specified by `image_id`.
fn tag_image(&self, image_id: i64, tag: &str) -> Result<()> {
let tag_id: i64 = self
.conn
.prepare("SELECT * FROM tags WHERE name = ?")?
.query_row(params![tag], |row| Ok(row.get(0)))??;
self.conn.execute(
"INSERT INTO mapping (image, tag) VALUES(?, ?)",
params![image_id, tag_id],
)?;
Ok(())
}
fn tags_for_image(&self, image_id: i64) -> Result<Vec<String>> {
Ok(self
.conn
.prepare(
"SELECT tags.name, COUNT(mapping.tag) as tag_count
FROM mapping
INNER JOIN images ON images.id = ?
INNER JOIN tags
GROUP BY tags.name",
)?
.query_map(params![image_id], |row| row.get(0))?
.filter_map(|tag| tag.ok())
.collect())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn tables_exist() {
let tb = TagBase::make_temporary().unwrap();
for table in ["images", "tags", "mapping"].iter() {
let exists = tb
.conn
.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name=?;")
.unwrap()
.exists(params![table])
.unwrap();
assert!(exists);
}
}
#[test]
fn insert_file() {
let tb = TagBase::make_temporary().unwrap();
let id = tb
.import_image(Path::new("/fake/path"), "fakehash")
.unwrap();
let exists = tb
.conn
.prepare("SELECT filename, blake2 FROM images WHERE id = ?;")
.unwrap()
.exists(params![id])
.unwrap();
assert!(exists);
}
}
fn main() {
let tb = TagBase::new("/tmp/test.db").unwrap();
let path = Path::new("/home/jakob/Sync/06fc9ae71549eb4d.jpeg");
let hash = hash_file(path).unwrap();
tb.import_image(path, &hash).unwrap();
println!("{:?}", tb);
}
|
