mirror of https://github.com/mastodon/flodgatt
111 lines
4.0 KiB
Rust
111 lines
4.0 KiB
Rust
use super::redis_msg::RedisMsg;
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use crate::{config::RedisNamespace, redis_to_client_stream::receiver::MessageQueues};
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use futures::{Async, Poll};
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use std::{io::Read, net};
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use tokio::io::AsyncRead;
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#[derive(Debug)]
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pub struct RedisStream {
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pub inner: net::TcpStream,
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incoming_raw_msg: String,
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pub namespace: RedisNamespace,
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}
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impl RedisStream {
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pub fn from_stream(inner: net::TcpStream) -> Self {
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RedisStream {
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inner,
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incoming_raw_msg: String::new(),
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namespace: RedisNamespace(None),
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}
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}
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pub fn with_namespace(self, namespace: RedisNamespace) -> Self {
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RedisStream { namespace, ..self }
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}
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// Text comes in from redis as a raw stream, which could be more than one message
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// and is not guaranteed to end on a message boundary. We need to break it down
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// into messages. Incoming messages *are* guaranteed to be RESP arrays,
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// https://redis.io/topics/protocol
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/// Adds any new Redis messages to the `MsgQueue` for the appropriate `ClientAgent`.
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pub fn poll_redis(&mut self, msg_queues: &mut MessageQueues) {
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let mut buffer = vec![0u8; 6000];
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if let Async::Ready(num_bytes_read) = self.poll_read(&mut buffer).unwrap() {
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let raw_utf = self.as_utf8(buffer, num_bytes_read);
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self.incoming_raw_msg.push_str(&raw_utf);
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// Only act if we have a full message (end on a msg boundary)
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if !self.incoming_raw_msg.ends_with("}\r\n") {
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return;
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};
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let prefix_to_skip = match &*self.namespace {
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Some(namespace) => format!("{}:timeline:", namespace),
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None => "timeline:".to_string(),
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};
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let mut msg = RedisMsg::from_raw(&self.incoming_raw_msg, prefix_to_skip.len());
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while !msg.raw.is_empty() {
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let command = msg.next_field();
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match command.as_str() {
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"message" => {
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let (timeline, msg_value) = msg.extract_timeline_and_message();
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for msg_queue in msg_queues.values_mut() {
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if msg_queue.redis_channel == timeline {
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msg_queue.messages.push_back(msg_value.clone());
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}
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}
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}
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"subscribe" | "unsubscribe" => {
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// No msg, so ignore & advance cursor to end
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let _channel = msg.next_field();
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msg.cursor += ":".len();
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let _active_subscriptions = msg.process_number();
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msg.cursor += "\r\n".len();
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}
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cmd => panic!("Invariant violation: {} is invalid Redis input", cmd),
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};
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msg = RedisMsg::from_raw(&msg.raw[msg.cursor..], msg.prefix_len);
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}
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self.incoming_raw_msg.clear();
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}
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}
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fn as_utf8(&mut self, cur_buffer: Vec<u8>, size: usize) -> String {
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String::from_utf8(cur_buffer[..size].to_vec()).unwrap_or_else(|_| {
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let mut new_buffer = vec![0u8; 1];
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self.poll_read(&mut new_buffer).unwrap();
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let buffer = ([cur_buffer, new_buffer]).concat();
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self.as_utf8(buffer, size + 1)
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})
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}
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}
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impl std::ops::Deref for RedisStream {
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type Target = net::TcpStream;
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fn deref(&self) -> &Self::Target {
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&self.inner
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}
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}
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impl std::ops::DerefMut for RedisStream {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.inner
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}
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}
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impl Read for RedisStream {
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fn read(&mut self, buffer: &mut [u8]) -> Result<usize, std::io::Error> {
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self.inner.read(buffer)
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}
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}
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impl AsyncRead for RedisStream {
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fn poll_read(&mut self, buf: &mut [u8]) -> Poll<usize, std::io::Error> {
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match self.read(buf) {
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Ok(t) => Ok(Async::Ready(t)),
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Err(_) => Ok(Async::NotReady),
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}
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}
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}
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