From fcd85ee5de82745211bdb4a1eef0077dc8a815d7 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Mon, 12 Jun 2023 23:15:28 +0300
Subject: can serialize and deserialise a vote from and to json

---
 internal/vote/vote.go      | 40 ++++++++++++++++++++++++++++++++++++++--
 internal/vote/vote_test.go | 21 +++++++++++++++++++++
 2 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/internal/vote/vote.go b/internal/vote/vote.go
index 7407848..f65b21d 100644
--- a/internal/vote/vote.go
+++ b/internal/vote/vote.go
@@ -1,6 +1,7 @@
 package vote
 
 import (
+	"encoding/json"
 	"log"
 	"strings"
 	"time"
@@ -13,7 +14,7 @@ const Expiry = 20 * time.Second
 type Vote struct {
 	FromID    string
 	IDs       []string
-	ExpiresAt time.Time
+	ExpiresAt time.Time `json:"-"`
 }
 
 func New(conf config.Config, message string) Vote {
@@ -34,10 +35,45 @@ func New(conf config.Config, message string) Vote {
 		ids = append(ids, id)
 	}
 
-	return Vote{fromID, ids, time.Now().Add(Expiry)}
+	return Vote{
+		FromID: fromID,
+		IDs:    ids,
+	}
+}
+
+func NewFromJSON(bytes []byte) (v Vote, err error) {
+	if err = json.Unmarshal(bytes, &v); err != nil {
+		return
+	}
+	v.ExpiresAt = time.Now().Add(Expiry)
+	return
+}
+
+func (v Vote) ToJSON() ([]byte, error) {
+	return json.Marshal(v)
 }
 
 func (v Vote) Expired() bool {
 	now := time.Now()
 	return now.After(v.ExpiresAt) || now.Equal(v.ExpiresAt)
 }
+
+func (v Vote) equals(v2 Vote) bool {
+	if v.FromID != v2.FromID {
+		return false
+	}
+
+	if len(v.IDs) != len(v2.IDs) {
+		return false
+	}
+
+	for i, id := range v.IDs {
+		if id != v2.IDs[i] {
+			return false
+		}
+	}
+
+	// Not comparing ExpiresAt
+
+	return true
+}
diff --git a/internal/vote/vote_test.go b/internal/vote/vote_test.go
index ca9e77c..8bc6647 100644
--- a/internal/vote/vote_test.go
+++ b/internal/vote/vote_test.go
@@ -48,3 +48,24 @@ func TestVoteExpiry(t *testing.T) {
 		t.Errorf("Expected vote to be expired")
 	}
 }
+
+func TestMarshalling(t *testing.T) {
+	var (
+		conf = config.Config{Nodes: []string{"foo:1234", "bay:4321"}}
+		v    = New(conf, "earth foo bar baz bay\n")
+	)
+
+	bytes, err := v.ToJSON()
+	if err != nil {
+		t.Errorf("unable to serialize vote to json: %v", err)
+	}
+
+	v2, err := NewFromJSON(bytes)
+	if err != nil {
+		t.Errorf("unable to deserialize json to vote: %v", err)
+	}
+
+	if !v.equals(v2) {
+		t.Errorf("serialized %v and deserialized %v votes differ", v, v2)
+	}
+}
-- 
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