From f26c19cbcd60175598824c7e09b64b8896daf721 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Fri, 22 Jan 2021 20:15:27 +0100
Subject: [PATCH] common/mclock: remove dependency on
 github.com/aristanetworks/goarista (#22211)

It takes three lines of code to get to runtime.nanotime, no need to
pull a dependency for that.
---
 common/mclock/mclock.go | 12 ++++++++----
 common/mclock/mclock.s  |  1 +
 go.mod                  |  1 -
 go.sum                  |  2 --
 4 files changed, 9 insertions(+), 7 deletions(-)
 create mode 100644 common/mclock/mclock.s

diff --git a/common/mclock/mclock.go b/common/mclock/mclock.go
index 3aca257cb3..c05738cf2b 100644
--- a/common/mclock/mclock.go
+++ b/common/mclock/mclock.go
@@ -20,15 +20,19 @@ package mclock
 import (
 	"time"
 
-	"github.com/aristanetworks/goarista/monotime"
+	_ "unsafe" // for go:linkname
 )
 
+//go:noescape
+//go:linkname nanotime runtime.nanotime
+func nanotime() int64
+
 // AbsTime represents absolute monotonic time.
-type AbsTime time.Duration
+type AbsTime int64
 
 // Now returns the current absolute monotonic time.
 func Now() AbsTime {
-	return AbsTime(monotime.Now())
+	return AbsTime(nanotime())
 }
 
 // Add returns t + d as absolute time.
@@ -74,7 +78,7 @@ type System struct{}
 
 // Now returns the current monotonic time.
 func (c System) Now() AbsTime {
-	return AbsTime(monotime.Now())
+	return Now()
 }
 
 // Sleep blocks for the given duration.
diff --git a/common/mclock/mclock.s b/common/mclock/mclock.s
new file mode 100644
index 0000000000..99a7a878f0
--- /dev/null
+++ b/common/mclock/mclock.s
@@ -0,0 +1 @@
+// This file exists in order to be able to use go:linkname.
diff --git a/go.mod b/go.mod
index d630dc6996..9162754ea3 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,6 @@ require (
 	github.com/Azure/go-autorest/autorest/adal v0.8.0 // indirect
 	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
 	github.com/VictoriaMetrics/fastcache v1.5.7
-	github.com/aristanetworks/goarista v0.0.0-20170210015632-ea17b1a17847
 	github.com/aws/aws-sdk-go v1.25.48
 	github.com/btcsuite/btcd v0.0.0-20171128150713-2e60448ffcc6
 	github.com/cespare/cp v0.1.0
diff --git a/go.sum b/go.sum
index f8939df2ba..327af03735 100644
--- a/go.sum
+++ b/go.sum
@@ -29,8 +29,6 @@ github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156 h1:eMwmnE/GDgah4HI848JfFxHt+iPb26b4zyfspmqY0/8=
 github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156/go.mod h1:Cb/ax3seSYIx7SuZdm2G2xzfwmv3TPSk2ucNfQESPXM=
-github.com/aristanetworks/goarista v0.0.0-20170210015632-ea17b1a17847 h1:rtI0fD4oG/8eVokGVPYJEW1F88p1ZNgXiEIs9thEE4A=
-github.com/aristanetworks/goarista v0.0.0-20170210015632-ea17b1a17847/go.mod h1:D/tb0zPVXnP7fmsLZjtdUhSsumbK/ij54UXjjVgMGxQ=
 github.com/aws/aws-sdk-go v1.25.48 h1:J82DYDGZHOKHdhx6hD24Tm30c2C3GchYGfN0mf9iKUk=
 github.com/aws/aws-sdk-go v1.25.48/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=