From 9b5218edb966aa705bff99b57574abea098dceab Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sun, 3 Oct 2021 11:15:07 +0200
Subject: executor: store start time and duration of tasks

---
 src/executor.rs | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/executor.rs b/src/executor.rs
index 06b3610..66b4af3 100644
--- a/src/executor.rs
+++ b/src/executor.rs
@@ -1,4 +1,8 @@
-use std::collections::{HashMap, HashSet};
+use std::{
+	collections::{HashMap, HashSet},
+	convert::TryInto,
+	time::{Instant, SystemTime, UNIX_EPOCH},
+};
 
 use indoc::indoc;
 use serde::{Deserialize, Serialize};
@@ -25,6 +29,8 @@ struct TaskMeta {
 	pub depends: HashMap<DependencyHash, Dependency>,
 	pub input_hash: InputHash,
 	pub output: HashMap<String, ArchiveHash>,
+	pub start_time: u64,
+	pub duration: u64,
 }
 
 impl TaskMeta {
@@ -49,6 +55,15 @@ impl TaskMeta {
 	}
 }
 
+fn epoch_msecs() -> u64 {
+	SystemTime::now()
+		.duration_since(UNIX_EPOCH)
+		.unwrap()
+		.as_millis()
+		.try_into()
+		.unwrap()
+}
+
 #[derive(Debug)]
 pub struct Executor<'ctx> {
 	ctx: &'ctx Context,
@@ -285,8 +300,14 @@ impl<'ctx> Executor<'ctx> {
 			input_hash,
 		};
 
+		let start_time = epoch_msecs();
+		let start_instant = Instant::now();
+
 		let output = runner.run(&task)?;
 
+		let end_instant = Instant::now();
+		let duration = end_instant.duration_since(start_instant);
+
 		let meta = TaskMeta {
 			id: task_ref.id.clone(),
 			args: task_ref
@@ -298,6 +319,8 @@ impl<'ctx> Executor<'ctx> {
 			depends: task.input.depends,
 			input_hash,
 			output,
+			start_time,
+			duration: duration.as_millis().try_into().unwrap(),
 		};
 		meta.save()?;
 
-- 
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