use 'chrono' for grabbing and printing timestamps in log

Cargo.lock

@@ -1,5 +1,11 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "autocfg"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
+
 [[package]]
 name = "bitflags"
 version = "1.2.1"
@@ -27,6 +33,17 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
+[[package]]
+name = "chrono"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80094f509cf8b5ae86a4966a39b3ff66cd7e2a3e594accec3743ff3fabeab5b2"
+dependencies = [
+ "num-integer",
+ "num-traits",
+ "time",
+]
+
 [[package]]
 name = "fuchsia-zircon"
 version = "0.3.3"
@@ -58,6 +75,7 @@ dependencies = [
 name = "hptp"
 version = "0.1.0"
 dependencies = [
+ "chrono",
  "rand",
  "thiserror",
  "tokio",
@@ -169,6 +187,25 @@ dependencies = [
  "winapi 0.3.8",
 ]
 
+[[package]]
+name = "num-integer"
+version = "0.1.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f6ea62e9d81a77cd3ee9a2a5b9b609447857f3d358704331e4ef39eb247fcba"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c62be47e61d1842b9170f0fdeec8eba98e60e90e5446449a0545e5152acd7096"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.1.4"
@@ -240,6 +277,12 @@ dependencies = [
  "rand_core",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.1.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
+
 [[package]]
 name = "slab"
 version = "0.4.2"
@@ -277,6 +320,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "time"
+version = "0.1.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
+dependencies = [
+ "libc",
+ "redox_syscall",
+ "winapi 0.3.8",
+]
+
 [[package]]
 name = "tokio"
 version = "0.2.13"

hptp/Cargo.toml

@@ -10,4 +10,5 @@ edition = "2018"
 [dependencies]
 tokio = {version = "0.2.*", features = ["io-std", "io-util", "udp"]}
 rand = "0.7.*"
-thiserror = "*"
+thiserror = "*"
+chrono = "0.4.*"

hptp/src/lib.rs

@@ -1,6 +1,7 @@
 extern crate rand;
 #[macro_use]
 extern crate thiserror;
+extern crate chrono;
 
 pub mod logger;
 pub mod msg;

hptp/src/logger.rs

@@ -1,7 +1,6 @@
 extern crate tokio;
 
 use std::fmt::Display;
-use std::time::SystemTime;
 use tokio::io::{AsyncWriteExt, Stderr};
 
 pub struct Logger {
@@ -26,11 +25,7 @@ impl Logger {
     }
 
     async fn log_payload(&mut self, payload: LogPayload<'_>) {
-        self.log_message(LogMessage {
-            timestamp: SystemTime::now(),
-            payload,
-        })
-        .await
+        self.log_message(LogMessage::now(payload)).await
     }
 
     // -----------------------------------------------------------------------------------
@@ -71,10 +66,19 @@ impl Logger {
 }
 
 struct LogMessage<'a> {
-    pub timestamp: SystemTime,
+    pub timestamp: chrono::DateTime<chrono::Local>,
     pub payload: LogPayload<'a>,
 }
 
+impl<'a> LogMessage<'a> {
+    fn now(payload: LogPayload<'a>) -> Self {
+        LogMessage {
+            timestamp: chrono::Local::now(),
+            payload,
+        }
+    }
+}
+
 enum LogPayload<'a> {
     Debug {
         what: &'a str,
@@ -109,7 +113,15 @@ pub use AcceptedOrder::*;
 
 impl Display for LogMessage<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        // TODO: write timestamp
+        use chrono::Timelike;
+        write!(
+            f,
+            "{:02}:{:02}:{:02} {:03.3} ",
+            self.timestamp.hour(),
+            self.timestamp.minute(),
+            self.timestamp.second(),
+            self.timestamp.nanosecond() as f64 * 0.000001
+        )?;
         self.payload.fmt(f)
     }
 }