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feat: adds trace events to server

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Avery Harnish
2020-03-03 12:31:49 -06:00
parent 80511f2cb5
commit 2b6b19ebc3
7 changed files with 651 additions and 7 deletions
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Cargo.lock generated
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@@ -1,5 +1,21 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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@@ -8,6 +24,11 @@ dependencies = [
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6
Cargo.toml
View File

@@ -6,6 +6,10 @@ version = "0.1.0"
[dependencies]
atoi = "0.3.2"
bytes = "0.5"
bytes = "0.5.4"
clap = { git = "https://github.com/clap-rs/clap/" }
tokio = { git = "https://github.com/tokio-rs/tokio", features = ["full"] }
tracing = "0.1.13"
tracing-futures = { version = "0.2.3", features = ["tokio"] }
tracing-subscriber = "0.2.2"
anyhow = "1.0.26"

11
README.md
View File

@@ -1,4 +1,11 @@
# Logging
* get / set
`mini-redis` uses [`tracing`](https://github.com/tokio-rs/tracing) to provide structured logs. Debug logs can be displayed by running:
* timeouts?
```console
RUST_LOG=debug cargo run --bin server
```
Logs will appear when commands are sent to the server from a client.
More documentation on enabling different log levels and filtering logs can be found [here](https://docs.rs/tracing-subscriber/latest/tracing_subscriber/filter/struct.EnvFilter.html#directives).

8
src/bin/server.rs
View File

@@ -1,9 +1,13 @@
use clap::Clap;
use mini_redis::{server, DEFAULT_PORT};
use std::io;
use anyhow::{anyhow, Result};
#[tokio::main]
pub async fn main() -> io::Result<()> {
pub async fn main() -> Result<()> {
// enable logging
// see https://docs.rs/tracing for more info
tracing_subscriber::fmt::try_init().map_err(|e| anyhow!("{:?}", e))?;
let cli = Cli::parse();
let port = cli.port.unwrap_or(DEFAULT_PORT.to_string());
server::run(&port).await

16
src/cmd/get.rs
View File

@@ -1,6 +1,7 @@
use crate::{Connection, Frame, Kv, Parse, ParseError};
use std::io;
use tracing::{debug, instrument};
#[derive(Debug)]
pub struct Get {
@@ -8,18 +9,31 @@ pub struct Get {
}
impl Get {
// instrumenting functions will log all of the arguments passed to the function
// with their debug implementations
// see https://docs.rs/tracing/0.1.13/tracing/attr.instrument.html
#[instrument]
pub(crate) fn parse(parse: &mut Parse) -> Result<Get, ParseError> {
let key = parse.next_string()?;
// adding this debug event allows us to see what key is parsed
// the ? sigil tells `tracing` to use the `Debug` implementation
// get parse events can be filtered by running
// RUST_LOG=mini_redis::cmd::get[parse]=debug cargo run --bin server
// see https://docs.rs/tracing/0.1.13/tracing/#recording-fields
debug!(?key);
Ok(Get { key })
}
#[instrument]
pub(crate) async fn apply(self, kv: &Kv, dst: &mut Connection) -> io::Result<()> {
let response = if let Some(value) = kv.get(&self.key) {
Frame::Bulk(value)
} else {
Frame::Null
};
debug!(?response);
dst.write_frame(&response).await
}
}

6
src/cmd/set.rs
View File

@@ -4,6 +4,7 @@ use crate::{Connection, Frame, Kv};
use bytes::Bytes;
use std::io;
use std::time::Duration;
use tracing::{debug, instrument};
#[derive(Debug)]
pub struct Set {
@@ -13,6 +14,7 @@ pub struct Set {
}
impl Set {
#[instrument]
pub(crate) fn parse(parse: &mut Parse) -> Result<Set, ParseError> {
use ParseError::EndOfStream;
@@ -34,14 +36,18 @@ impl Set {
Err(err) => return Err(err),
}
debug!(?key, ?value, ?expire);
Ok(Set { key, value, expire })
}
#[instrument]
pub(crate) async fn apply(self, kv: &Kv, dst: &mut Connection) -> io::Result<()> {
// Set the value
kv.set(self.key, self.value, self.expire);
let response = Frame::Simple("OK".to_string());
debug!(?response);
dst.write_frame(&response).await
}
}

3
src/server.rs
View File

@@ -1,5 +1,6 @@
use crate::{Command, Connection, Kv, Shutdown};
use anyhow::Result;
use tokio::io;
use tokio::net::TcpListener;
use tokio::signal;
@@ -29,7 +30,7 @@ struct Handler {
}
/// Run the mini-redis server.
pub async fn run(port: &str) -> io::Result<()> {
pub async fn run(port: &str) -> Result<()> {
let (notify_shutdown, _) = broadcast::channel(1);
let mut server = Server {