From 3a7a6a30130ed6f3eae25d21bde607a979a305c1 Mon Sep 17 00:00:00 2001
From: Ian Davis <nospam@iandavis.com>
Date: Tue, 26 Oct 2021 12:01:34 +0100
Subject: [PATCH] Remove arbitrary sleeps from tests

---
 pubsub_test.go | 64 ++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 57 insertions(+), 7 deletions(-)

diff --git a/pubsub_test.go b/pubsub_test.go
index a89ba67..68ac541 100644
--- a/pubsub_test.go
+++ b/pubsub_test.go
@@ -3,6 +3,7 @@ package namesys
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"testing"
 	"time"
@@ -146,7 +147,8 @@ func TestEarlyPublish(t *testing.T) {
 	}
 
 	// Wait for Fetch protocol to retrieve data
-	time.Sleep(time.Second * 1)
+	waitForPropagation(ctx, t, vss, key)
+
 	for i, vs := range vss {
 		checkValue(ctx, t, i, vs, key, val)
 	}
@@ -168,7 +170,7 @@ func TestPubsubPublishSubscribe(t *testing.T) {
 	}
 
 	// let the flood propagate
-	time.Sleep(time.Second * 1)
+	waitForPropagation(ctx, t, vss, key)
 	for i, vs := range vss {
 		checkValue(ctx, t, i, vs, key, val)
 	}
@@ -180,7 +182,7 @@ func TestPubsubPublishSubscribe(t *testing.T) {
 	}
 
 	// let the flood propagate
-	time.Sleep(time.Second * 1)
+	waitForPropagation(ctx, t, vss, key)
 	for i, vs := range vss {
 		checkValue(ctx, t, i, vs, key, val)
 	}
@@ -193,7 +195,7 @@ func TestPubsubPublishSubscribe(t *testing.T) {
 	}
 
 	// let the flood propagate
-	time.Sleep(time.Second * 1)
+	waitForPropagation(ctx, t, vss, key)
 	for i, vs := range vss {
 		checkValue(ctx, t, i, vs, key, val)
 	}
@@ -206,7 +208,7 @@ func TestPubsubPublishSubscribe(t *testing.T) {
 	}
 
 	// let the flood propagate
-	time.Sleep(time.Second * 1)
+	waitForPropagation(ctx, t, vss, key)
 	for i, vs := range vss {
 		checkValue(ctx, t, i, vs, key, val)
 	}
@@ -227,7 +229,8 @@ func TestPubsubPublishSubscribe(t *testing.T) {
 	}
 
 	// let the flood propagate
-	time.Sleep(time.Second * 1)
+	waitForPropagation(ctx, t, vss, key2)
+	waitForPropagation(ctx, t, vss, key)
 	for i, vs := range vss {
 		checkValue(ctx, t, i, vs, key2, nval)
 		checkValue(ctx, t, i, vs, key, val)
@@ -254,7 +257,7 @@ func TestPubsubPublishSubscribe(t *testing.T) {
 	}
 
 	// check that we get the new value
-	time.Sleep(time.Second * 1)
+	waitForPropagation(ctx, t, vss, key)
 	for i, vs := range vss {
 		checkValue(ctx, t, i, vs, key, nval)
 	}
@@ -392,3 +395,50 @@ func checkValue(ctx context.Context, t *testing.T, i int, vs routing.ValueStore,
 		t.Fatalf("[ValueStore %d] unexpected value: expected '%s', got '%s'", i, val, xval)
 	}
 }
+
+func waitForPropagation(ctx context.Context, t *testing.T, vss []*PubsubValueStore, key string) {
+	t.Helper()
+
+	condition := func(ctx context.Context) (bool, error) {
+		for _, vs := range vss {
+			_, err := vs.GetValue(ctx, key)
+			if err == nil {
+				continue
+			} else if errors.Is(err, routing.ErrNotFound) {
+				// Not propogated yet
+				return false, nil
+			} else {
+				// Some other error occured
+				return false, err
+			}
+		}
+
+		// No errors, all done
+		return true, nil
+	}
+
+	err := waitUntil(ctx, condition, 100*time.Millisecond)
+	if err != nil {
+		t.Fatalf("[ValueStore] vssolve failed: %v", err)
+	}
+}
+
+func waitUntil(ctx context.Context, condition func(context.Context) (bool, error), interval time.Duration) error {
+	tick := time.NewTicker(interval)
+	defer tick.Stop()
+
+	for {
+		select {
+		case <-tick.C:
+			done, err := condition(ctx)
+			if err != nil {
+				return err
+			}
+			if done {
+				return nil
+			}
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+}