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

use deadpool_postgres::{CreatePoolError, Pool, PoolError, Runtime};

use tokio_postgres::Error as PgError;
use tokio_postgres::NoTls;

pub use deadpool::managed::TimeoutType;
pub use deadpool_postgres::{Config as PgConfig, ConfigError};

use crate::connection::ConnectionOwned;
use crate::migrations::Migrations;
use crate::table::TableOwned;
use crate::table::TableTemplate;

#[derive(Debug, thiserror::Error)]
#[non_exhaustive]
pub enum DatabaseError {
	#[error("The database configuration is invalid {0}")]
	Config(ConfigError),

	#[error("Getting a connection timed out {0:?}")]
	Timeout(TimeoutType),

	#[error("Connection error {0}")]
	Connection(#[from] crate::Error),

	#[error("Postgres error {0}")]
	Other(#[from] PgError),
}

#[derive(Clone, Debug, Default)]
pub struct Config {
	pg_config: PgConfig,
	migration_table: Option<String>,
}

impl Config {
	pub fn from_pg_config(pg_config: PgConfig) -> Self {
		Self {
			pg_config,
			..Default::default()
		}
	}

	pub fn host(mut self, host: impl Into<String>) -> Self {
		self.pg_config.host = Some(host.into());
		self
	}

	pub fn dbname(mut self, dbname: impl Into<String>) -> Self {
		self.pg_config.dbname = Some(dbname.into());
		self
	}

	pub fn user(mut self, user: impl Into<String>) -> Self {
		self.pg_config.user = Some(user.into());
		self
	}

	pub fn password(mut self, password: impl Into<String>) -> Self {
		self.pg_config.password = Some(password.into());
		self
	}

	pub fn migration_table(mut self, table: impl Into<String>) -> Self {
		self.migration_table = Some(table.into());
		self
	}

	pub fn pg_config(&self) -> &PgConfig {
		&self.pg_config
	}

	pub fn pg_config_mut(&mut self) -> &mut PgConfig {
		&mut self.pg_config
	}
}

#[derive(Debug, Clone)]
pub struct Database {
	pool: Pool,
	migrations: Migrations,
}

impl Database {
	/// Create a new database
	pub async fn new(
		name: impl Into<String>,
		user: impl Into<String>,
		password: impl Into<String>,
	) -> Result<Self, DatabaseError> {
		Self::with_host("localhost", name, user, password).await
	}

	/// Create a new database with a host
	pub async fn with_host(
		host: impl Into<String>,
		name: impl Into<String>,
		user: impl Into<String>,
		password: impl Into<String>,
	) -> Result<Self, DatabaseError> {
		Self::with_cfg(
			Config::default()
				.host(host)
				.dbname(name)
				.user(user)
				.password(password),
		)
		.await
	}

	pub async fn with_cfg(cfg: Config) -> Result<Self, DatabaseError> {
		let pool = cfg
			.pg_config
			.create_pool(Some(Runtime::Tokio1), NoTls)
			.map_err(|e| match e {
				CreatePoolError::Config(e) => DatabaseError::Config(e),
				CreatePoolError::Build(_) => unreachable!(
					"since we provide a runtime this should never happen"
				),
			})?;

		let this = Self {
			pool,
			migrations: Migrations::new(cfg.migration_table),
		};

		// just make sure the connection worked
		let mut db = this.get().await?;

		this.migrations.init(&mut db).await?;

		Ok(this)
	}

	pub async fn get(&self) -> Result<ConnectionOwned, DatabaseError> {
		self.pool
			.get()
			.await
			.map_err(|e| match e {
				PoolError::Timeout(tim) => DatabaseError::Timeout(tim),
				PoolError::Backend(e) => e.into(),
				PoolError::Closed => todo!("when can a pool be closed?"),
				PoolError::NoRuntimeSpecified => unreachable!(),
				PoolError::PostCreateHook(e) => {
					todo!("what is this error {e:?}?")
				}
			})
			.map(ConnectionOwned)
	}

	pub fn migrations(&self) -> Migrations {
		self.migrations.clone()
	}

	/// Get a table from the database
	pub fn table_owned<T>(&self, name: &'static str) -> TableOwned<T>
	where
		T: TableTemplate,
	{
		TableOwned::new(self.clone(), name)
	}
}