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
use std::error::Error;
use crate::handler::RequestHandler;
use crate::{OptionReqBody, RequestContext, ResponseBody, Router};
use async_trait::async_trait;
use http::{Request, Response};
use micro_http::connection::HttpConnection;
use micro_http::handler::Handler;
use micro_http::protocol::body::ReqBody;
use micro_http::protocol::RequestHeader;
use std::net::{SocketAddr, ToSocketAddrs};
use std::sync::Arc;
use thiserror::Error;
use tokio::net::TcpListener;
use tracing::{error, info, warn, Level};
use tracing_subscriber::FmtSubscriber;
pub struct ServerBuilder {
router: Option<Router>,
default_handler: Option<Box<dyn RequestHandler>>,
address: Option<Vec<SocketAddr>>,
}
impl ServerBuilder {
fn new() -> Self {
Self { router: None, default_handler: None, address: None }
}
pub fn address<A: ToSocketAddrs>(mut self, address: A) -> Self {
self.address = Some(address.to_socket_addrs().unwrap().collect::<Vec<_>>());
self
}
pub fn router(mut self, router: Router) -> Self {
self.router = Some(router);
self
}
pub fn default_handler(mut self, request_handler: impl RequestHandler + 'static) -> Self {
self.default_handler = Some(Box::new(request_handler));
self
}
pub fn build(self) -> Result<Server, ServerBuildError> {
let router = self.router.ok_or(ServerBuildError::MissingRouter).unwrap();
let address = self.address.ok_or(ServerBuildError::MissingAddress).unwrap();
Ok(Server { router, default_handler: self.default_handler, address })
}
}
pub struct Server {
router: Router,
default_handler: Option<Box<dyn RequestHandler>>,
address: Vec<SocketAddr>,
}
#[derive(Error, Debug)]
pub enum ServerBuildError {
#[error("router must be set")]
MissingRouter,
#[error("address must be set")]
MissingAddress,
}
impl Server {
pub fn builder() -> ServerBuilder {
ServerBuilder::new()
}
pub async fn start(self) {
let subscriber = FmtSubscriber::builder().with_max_level(Level::INFO).finish();
tracing::subscriber::set_global_default(subscriber).expect("setting default subscriber failed");
info!("start listening at {:?}", self.address);
let tcp_listener = match TcpListener::bind(self.address.as_slice()).await {
Ok(tcp_listener) => tcp_listener,
Err(e) => {
error!(cause = %e, "bind server error");
return;
}
};
let handler = Arc::new(self);
loop {
let (tcp_stream, _remote_addr) = match tcp_listener.accept().await {
Ok(stream_and_addr) => stream_and_addr,
Err(e) => {
warn!(cause = %e, "failed to accept");
continue;
}
};
let handler = handler.clone();
tokio::spawn(async move {
let (reader, writer) = tcp_stream.into_split();
let connection = HttpConnection::new(reader, writer);
match connection.process(handler).await {
Ok(_) => {
info!("finished process, connection shutdown");
}
Err(e) => {
error!("service has error, cause {}, connection shutdown", e);
}
}
});
}
}
}
#[async_trait]
impl Handler for Server {
type RespBody = ResponseBody;
type Error = Box<dyn Error + Send + Sync>;
async fn call(&self, req: Request<ReqBody>) -> Result<Response<Self::RespBody>, Self::Error> {
let (parts, body) = req.into_parts();
let header = RequestHeader::from(parts);
let req_body = OptionReqBody::from(body);
let path = header.uri().path();
let route_result = self.router.at(path);
let request_context = RequestContext::new(&header, route_result.params());
let handler_option = route_result
.router_items()
.into_iter()
.filter(|item| item.filter().check(&request_context))
.map(|item| item.handler())
.take(1)
.next();
match handler_option {
Some(handler) => handler.invoke(request_context, req_body).await,
None => {
let default_handler = self.default_handler.as_ref().unwrap();
default_handler.invoke(request_context, req_body).await
}
}
}
}