hiqlite 0.13.0

Hiqlite - highly-available, embeddable, raft-based SQLite + cache
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

use crate::Error;
use crate::app_state::RaftType;
use crate::helpers::serialize;
use crate::server::proxy::state::AppStateProxy;
use crate::server::proxy::stream;
use crate::store::state_machine::memory::notify_handler::NotifyRequest;
use axum::Json;
use axum::extract::Path;
use axum::http::header::ACCEPT;
use axum::http::{HeaderMap, HeaderValue};
use axum::response::{IntoResponse, Response, sse};
use fastwebsockets::upgrade;
use futures_util::Stream;
use serde::Serialize;
use std::fmt::Debug;
use std::sync::Arc;
use tracing::error;

pub type AppStateExt = axum::extract::State<Arc<AppStateProxy>>;

static HEADER_NAME_SECRET: &str = "X-API-SECRET";

pub async fn ping() {}

pub async fn listen(
    state: AppStateExt,
    headers: HeaderMap,
) -> Result<sse::Sse<impl Stream<Item = Result<sse::Event, Error>>>, Error> {
    validate_secret(&state, &headers)?;

    let (tx, rx) = flume::unbounded();
    state
        .tx_notify
        .send_async(NotifyRequest::Listen(tx))
        .await?;

    Ok(sse::Sse::new(rx.into_stream()).keep_alive(sse::KeepAlive::default()))
}

pub async fn stream(
    state: AppStateExt,
    ws: upgrade::IncomingUpgrade,
) -> Result<impl IntoResponse, Error> {
    let (response, socket) = ws.upgrade()?;

    tokio::task::spawn(async move {
        if let Err(err) = stream::handle_socket(state, socket).await {
            // if let Err(err) = handle_socket_sequential(state, socket).await {
            error!("Error in websocket connection: {}", err);
        }
    });

    Ok(response)
}

pub(crate) async fn metrics(
    state: AppStateExt,
    headers: HeaderMap,
    Path(raft_type): Path<RaftType>,
) -> Result<Response, Error> {
    validate_secret(&state, &headers)?;

    let metrics = match raft_type {
        #[cfg(feature = "sqlite")]
        RaftType::Sqlite => state.client.metrics_db().await?,
        #[cfg(feature = "cache")]
        RaftType::Cache => state.client.metrics_cache().await?,
        RaftType::Unknown => panic!("neither `sqlite` nor `cache` feature enabled"),
    };

    fmt_ok(headers, &metrics)
}

#[inline(always)]
fn fmt_ok<S: Debug + Serialize>(headers: HeaderMap, payload: S) -> Result<Response, Error> {
    if let Some(accept) = headers.get(ACCEPT)
        && accept == HeaderValue::from_static("application/json")
    {
        return Ok(Json(payload).into_response());
    }
    Ok(serialize(&payload)?.into_response())
}

#[inline(always)]
fn validate_secret(state: &AppStateExt, headers: &HeaderMap) -> Result<(), Error> {
    match headers.get(HEADER_NAME_SECRET) {
        None => Err(Error::Token("API Secret missing".into())),
        Some(secret) => {
            if state.secret_api.as_bytes() != secret.as_bytes() {
                Err(Error::Token("Invalid API Secret".into()))
            } else {
                Ok(())
            }
        }
    }
}