diff --git a/Cargo.lock b/Cargo.lock index 36cee8f..8fb82b7 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1,5 +1,21 @@ # This file is automatically @generated by Cargo. # It is not intended for manual editing. +[[package]] +name = "aho-corasick" +version = "0.7.9" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "memchr 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)", +] + +[[package]] +name = "ansi_term" +version = "0.11.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)", +] + [[package]] name = "ansi_term" version = "0.12.1" @@ -8,6 +24,11 @@ dependencies = [ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)", ] +[[package]] +name = "anyhow" +version = "1.0.26" +source = "registry+https://github.com/rust-lang/crates.io-index" + [[package]] name = "arc-swap" version = "0.4.4" @@ -41,6 +62,20 @@ name = 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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). diff --git a/src/bin/server.rs b/src/bin/server.rs index 194b5a3..0fdf9cf 100644 --- a/src/bin/server.rs +++ b/src/bin/server.rs @@ -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 diff --git a/src/cmd/get.rs b/src/cmd/get.rs index 69c2396..77f9da1 100644 --- a/src/cmd/get.rs +++ b/src/cmd/get.rs @@ -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 { 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 } } diff --git a/src/cmd/set.rs b/src/cmd/set.rs index 60e0c32..e8fcd3e 100644 --- a/src/cmd/set.rs +++ b/src/cmd/set.rs @@ -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 { 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 } } diff --git a/src/server.rs b/src/server.rs index b8b6181..6fbd9be 100644 --- a/src/server.rs +++ b/src/server.rs @@ -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 {