17 unstable releases (3 breaking)
0.3.6 | May 2, 2023 |
---|---|
0.3.5 | Mar 13, 2023 |
0.3.4 | Feb 22, 2023 |
0.3.0-alpha.2 |
|
0.0.1 | Dec 9, 2022 |
#14 in #handshake
56 downloads per month
48KB
1K
SLoC
cometd-client
lib.rs
:
This crate aims to make a client for CometD protocol.
This project is in progress and might change a lot from version to version.
Table of contents
- Connect endpoints
- Authentication
- Authentication through authorization header
- Authentication through cookie
- How to interact with client?
Connect endpoints
Client has ability to customize endpoints base paths:
CometdClientBuilder::handshake_base_path
;CometdClientBuilder::subscribe_base_path
;CometdClientBuilder::connect_base_path
;CometdClientBuilder::disconnect_base_path
;
For example to change handshake base path and
get http://[::1]:1025/notifications/node/0/handshake
you can do this:
use cometd_client::CometdClientBuilder;
let client = CometdClientBuilder::new(&"http://[::1]:1025/notifications/".parse()?)
.handshake_base_path("hand/")
.build()?;
Same for others endpoints.
Authentication
There is 2 options to authenticate on server,
through authorization
header and cookie.
Authentication through authorization header
To use access token with authorization
header,
you must set it through CometdClientBuilder::access_token
.
This library provide 2 default structs:
types::access_token::Bearer
and types::access_token::Basic
.
use cometd_client::{CometdClientBuilder, types::access_token::{Bearer, Basic}};
// let access_token = Bearer::new("access-token");
let access_token = Basic::create("username", Some("optional password"))?;
let client = CometdClientBuilder::new(&"http://[::1]:1025/notifications/".parse()?)
.access_token(access_token)
.build()?;
But you can make you own access token for authorization
header:
use core::fmt::{Formatter, Debug};
use cometd_client::types::AccessToken;
struct OAuth(String);
impl Debug for OAuth {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "OAuth(***)")
}
}
impl OAuth {
pub fn new(access_token: &str) -> Self {
Self(format!("OAuth {access_token}"))
}
}
impl AccessToken for OAuth {
fn get_authorization_token(&self) -> &str {
&self.0
}
}
Authentication through cookie
If you use session cookies for authentication (or other reasons) you can set it (or them)
through CometdClientBuilder::cookie
or CometdClientBuilder::cookies
.
use cometd_client::CometdClientBuilder;
let client = CometdClientBuilder::new(&"http://[::1]:1025/notifications/".parse()?)
.cookie("cookie0-name", "cookie0-value")
.cookies([
("cookie1-name", "cookie1-value"),
("cookie2-name", "cookie2-value")
])
.build()?;
How to interact with client?
Client use MPMC channel to send messages and errors.
CometdClientBuilder::build
spawn task which do handshake and start wait for messages.
If handshake request was unsuccessful with types::Reconnect::Handshake
or types::Reconnect::Retry
advice from server,
then client tries redo it by CometdClientBuilder::number_of_retries
times.
In other cases task send error to event channel and stops.
After successful handshake task start listen messages coming from server.
If during that requests occurs error with types::Reconnect::Handshake
advice,
then client will tries redo handshake (look above).
If error will be with types::Reconnect::Retry
advice, then it will try redo it
by CometdClientBuilder::number_of_retries
times.
To send subscribe command you must use CometdClient::subscribe
.
If error occurs it will be redone by same scheme as for connect (look above).
To get event channel receiver use CometdClient::rx
.
use cometd_client::{types::CometdClientEvent, CometdClientBuilder};
let client = CometdClientBuilder::new(&"http://[::0]:1025/notifications/".parse()?)
.build()?;
let mut rx = client.rx();
tokio::spawn(async move {
while let Some(event) = rx.recv().await {
match event {
CometdClientEvent::Message(messages) => println!("got messages: `{messages:?}`."),
CometdClientEvent::Error(error) => eprintln!("got error: `{error:?}`."),
}
}
});
Dependencies
~10–21MB
~303K SLoC