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
|
//! This module implements the database connection actor.
use actix::prelude::*;
use diesel;
use diesel::prelude::*;
use diesel::r2d2::{Pool, ConnectionManager};
use models::*;
use errors::{ConverseError, Result};
/// The DB actor itself. Several of these will be run in parallel by
/// `SyncArbiter`.
pub struct DbExecutor(pub Pool<ConnectionManager<PgConnection>>);
impl Actor for DbExecutor {
type Context = SyncContext<Self>;
}
/// Message used to request a list of threads.
/// TODO: This should support page numbers.
pub struct ListThreads;
impl Message for ListThreads {
type Result = Result<Vec<Thread>>;
}
impl Handler<ListThreads> for DbExecutor {
type Result = <ListThreads as Message>::Result;
fn handle(&mut self, _: ListThreads, _: &mut Self::Context) -> Self::Result {
use schema::threads::dsl::*;
let conn = self.0.get()?;
let results = threads
.order(posted.desc())
.load::<Thread>(&conn)?;
Ok(results)
}
}
/// Message used to fetch a specific thread. Returns the thread and
/// its posts.
pub struct GetThread(pub i32);
impl Message for GetThread {
type Result = Result<(Thread, Vec<Post>)>;
}
impl Handler<GetThread> for DbExecutor {
type Result = <GetThread as Message>::Result;
fn handle(&mut self, msg: GetThread, _: &mut Self::Context) -> Self::Result {
use schema::threads::dsl::*;
let conn = self.0.get()?;
let thread_result: Thread = threads
.find(msg.0).first(&conn)?;
let post_list = Post::belonging_to(&thread_result).load::<Post>(&conn)?;
Ok((thread_result, post_list))
}
}
/// Message used to create a new thread
pub struct CreateThread {
pub new_thread: NewThread,
pub body: String,
}
impl Message for CreateThread {
type Result = Result<Thread>;
}
impl Handler<CreateThread> for DbExecutor {
type Result = <CreateThread as Message>::Result;
fn handle(&mut self, msg: CreateThread, _: &mut Self::Context) -> Self::Result {
use schema::threads;
use schema::posts;
let conn = self.0.get()?;
conn.transaction::<Thread, ConverseError, _>(|| {
// First insert the thread structure itself
let thread: Thread = diesel::insert_into(threads::table)
.values(&msg.new_thread)
.get_result(&conn)?;
// ... then create the first post in the thread.
let new_post = NewPost {
thread_id: thread.id,
body: msg.body,
author_name: msg.new_thread.author_name.clone(),
author_email: msg.new_thread.author_email.clone(),
};
diesel::insert_into(posts::table)
.values(&new_post)
.execute(&conn)?;
Ok(thread)
})
}
}
/// Message used to create a new reply
pub struct CreatePost(pub NewPost);
impl Message for CreatePost {
type Result = Result<Post>;
}
impl Handler<CreatePost> for DbExecutor {
type Result = <CreatePost as Message>::Result;
fn handle(&mut self, msg: CreatePost, _: &mut Self::Context) -> Self::Result {
use schema::posts;
let conn = self.0.get()?;
Ok(diesel::insert_into(posts::table)
.values(&msg.0)
.get_result(&conn)?)
}
}
|
