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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
//!
// This integration relies on _knowing_ which backend is being used at compile-time
// This is a poor woman's XOR - if you know how to make it more pretty, PRs welcome <3
#[cfg(any(
all(feature = "pg", feature = "mysql"),
all(feature = "pg", feature = "sqlite3"),
all(feature = "mysql", feature = "sqlite3")
))]
compile_error!("`barrel` can only integrate with `diesel` if you select one (1) backend!");
use diesel_rs::connection::SimpleConnection;
use diesel_rs::migration::{Migration, RunMigrationsError};
use std::fs::{self, File};
use std::io::prelude::*;
use std::path::{Path, PathBuf};
use std::process::Command;
/// Represents a migration run inside Diesel
///
/// 1. Path
/// 2. Version
/// 3. Up
/// 4. Down
pub struct BarrelMigration(PathBuf, String, String, String);
impl Migration for BarrelMigration {
fn file_path(&self) -> Option<&Path> {
Some(self.0.as_path())
}
fn version(&self) -> &str {
&self.1
}
fn run(&self, conn: &SimpleConnection) -> Result<(), RunMigrationsError> {
conn.batch_execute(&self.2)?;
Ok(())
}
fn revert(&self, conn: &SimpleConnection) -> Result<(), RunMigrationsError> {
conn.batch_execute(&self.3)?;
Ok(())
}
}
/// Generate migration files using the barrel schema builder
pub fn generate_initial(path: &PathBuf) {
generate_initial_with_content(
path,
&"fn up(migr: &mut Migration) {} \n\n".to_string(),
&"fn down(migr: &mut Migration) {} \n".to_string(),
)
}
/// Generate migration files using the barrel schema builder with initial content
pub fn generate_initial_with_content(path: &PathBuf, up_content: &String, down_content: &String) {
let migr_path = path.join("mod.rs");
println!("Creating {}", migr_path.display());
let mut barrel_migr = fs::File::create(migr_path).unwrap();
barrel_migr.write(b"/// Handle up migrations \n").unwrap();
barrel_migr.write(up_content.as_bytes()).unwrap();
barrel_migr.write(b"/// Handle down migrations \n").unwrap();
barrel_migr.write(down_content.as_bytes()).unwrap();
}
/// Generate a Migration from the provided path
pub fn migration_from(path: &Path) -> Option<Box<Migration>> {
match path.join("mod.rs").exists() {
true => Some(run_barrel_migration_wrapper(&path.join("mod.rs"))),
false => None,
}
}
fn version_from_path(path: &Path) -> Result<String, ()> {
path.parent()
.unwrap_or_else(|| {
panic!(
"Migration doesn't appear to be in a directory: `{:?}`",
path
)
})
.file_name()
.unwrap_or_else(|| panic!("Can't get file name from path `{:?}`", path))
.to_string_lossy()
.split('_')
.nth(0)
.map(|s| Ok(s.replace('-', "")))
.unwrap_or_else(|| Err(()))
}
fn run_barrel_migration_wrapper(path: &Path) -> Box<Migration> {
let (up, down) = run_barrel_migration(&path);
let version = version_from_path(path).unwrap();
let migration_path = match path.parent() {
Some(parent_path) => parent_path.to_path_buf(),
None => path.to_path_buf(),
};
Box::new(BarrelMigration(migration_path, version, up, down))
}
fn run_barrel_migration(migration: &Path) -> (String, String) {
/* Create a tmp dir with src/ child */
use tempfile::Builder;
let dir = Builder::new().prefix("barrel").tempdir().unwrap();
fs::create_dir_all(&dir.path().join("src")).unwrap();
let (feat, ident) = get_backend_pair();
let toml = format!(
"# This file is auto generated by barrel
[package]
name = \"tmp-generator\"
description = \"Doing nasty things with cargo\"
version = \"0.0.0\"
authors = [\"Katharina Fey <kookie@spacekookie.de>\"]
# TODO: Use same `barrel` dependency as crate
[dependencies]
barrel = {{ version = \"*\", features = [ {:?} ] }}",
feat
);
/* Add a Cargo.toml file */
let ct = dir.path().join("Cargo.toml");
let mut cargo_toml = File::create(&ct).unwrap();
cargo_toml.write_all(toml.as_bytes()).unwrap();
/* Generate main.rs based on user migration */
let main_file_path = &dir.path().join("src").join("main.rs");
let mut main_file = File::create(&main_file_path).unwrap();
let user_migration = migration.as_os_str().to_os_string().into_string().unwrap();
main_file
.write_all(
format!(
"//! This file is auto generated by barrel
extern crate barrel;
use barrel::*;
use barrel::backend::{ident};
include!(\"{}\");
fn main() {{
let mut m_up = Migration::new();
up(&mut m_up);
println!(\"{{}}\", m_up.make::<{ident}>());
let mut m_down = Migration::new();
down(&mut m_down);
println!(\"{{}}\", m_down.make::<{ident}>());
}}
",
user_migration,
ident = ident
)
.as_bytes(),
)
.unwrap();
let output = if cfg!(target_os = "windows") {
Command::new("cargo")
.current_dir(dir.path())
.arg("run")
.output()
.expect("failed to execute cargo!")
} else {
Command::new("sh")
.current_dir(dir.path())
.arg("-c")
.arg("cargo run")
.output()
.expect("failed to execute cargo!")
};
let output = String::from_utf8_lossy(&output.stdout);
let vec: Vec<&str> = output.split("\n").collect();
let up = String::from(vec[0]);
let down = String::from(vec[1]);
(up, down)
}
/// Uses the fact that barrel with diesel support is only compiled with _one_ feature
///
/// The first string is the feature-name, the other the struct ident
fn get_backend_pair() -> (&'static str, &'static str) {
#[cfg(feature = "pg")]
return ("pg", "Pg");
#[cfg(feature = "mysql")]
return ("mysql", "Mysql");
#[cfg(feature = "sqlite3")]
return ("sqlite3", "Sqlite");
}
|
