From 89b0e25e2c6084025c3c6e88237a54aa8766fd9c Mon Sep 17 00:00:00 2001
From: yyforyongyu <yy2452@columbia.edu>
Date: Thu, 19 Jan 2023 06:31:17 +0800
Subject: [PATCH] multi: add `lnutils` to host fundamental utility functions

We also move the `fn/stream.go` into the package `lnutils`. Eventually
we will put all the [utility
functions](https://github.com/lightninglabs/taro/tree/main/chanutils)
into this package.
---
 discovery/gossiper.go     | 4 ++--
 lnutils/README.md         | 4 ++++
 {fn => lnutils}/stream.go | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)
 create mode 100644 lnutils/README.md
 rename {fn => lnutils}/stream.go (93%)

diff --git a/discovery/gossiper.go b/discovery/gossiper.go
index 9bb6959e5..eb13d77ea 100644
--- a/discovery/gossiper.go
+++ b/discovery/gossiper.go
@@ -18,10 +18,10 @@ import (
 	"github.com/lightningnetwork/lnd/batch"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/channeldb"
-	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/kvdb"
 	"github.com/lightningnetwork/lnd/lnpeer"
+	"github.com/lightningnetwork/lnd/lnutils"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/multimutex"
@@ -1185,7 +1185,7 @@ func (d *AuthenticatedGossiper) sendBatch(annBatch []msgWithSenders,
 	// skip the filter and dedup logic below, and just send the
 	// announcements out to all our coonnected peers.
 	if isLocal {
-		msgsToSend := fn.Map(
+		msgsToSend := lnutils.Map(
 			annBatch, func(m msgWithSenders) lnwire.Message {
 				return m.msg
 			},
diff --git a/lnutils/README.md b/lnutils/README.md
new file mode 100644
index 000000000..fe2fafa7c
--- /dev/null
+++ b/lnutils/README.md
@@ -0,0 +1,4 @@
+# `lnutils`
+
+This package provides fundamental types and utility functions that can be used
+by all other packages.
diff --git a/fn/stream.go b/lnutils/stream.go
similarity index 93%
rename from fn/stream.go
rename to lnutils/stream.go
index 9974eb467..ed04fa2ee 100644
--- a/fn/stream.go
+++ b/lnutils/stream.go
@@ -1,4 +1,4 @@
-package fn
+package lnutils
 
 // Map takes an input slice, and applies the function f to each element,
 // yielding a new slice.