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kiara_test.go
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kiara_test.go
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package kiara_test
import (
"context"
"fmt"
"time"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"github.com/genkami/kiara"
"github.com/genkami/kiara/adapter/inmemory"
)
const defaultChSize = 10
var (
timeoutExpectedNotToExceed = 3 * time.Second
timeoutExpectedToExceed = 10 * time.Millisecond
)
var _ = Describe("Kiara", func() {
var (
broker *inmemory.Broker
pubsub *kiara.PubSub
)
BeforeEach(func() {
broker = inmemory.NewBroker()
adapter := inmemory.NewAdapter(broker)
pubsub = kiara.NewPubSub(adapter)
})
AfterEach(func() {
pubsub.Close()
broker.Close()
})
Describe("Subscribe", func() {
Context("when the second argument is `chan T`", func() {
It("can subscribe to the topic", func() {
var ch chan int = make(chan int, defaultChSize)
sub, err := pubsub.Subscribe("room:123", ch)
Expect(err).NotTo(HaveOccurred())
err = sub.Unsubscribe()
Expect(err).NotTo(HaveOccurred())
})
})
Context("when the second argument is `chan<- T`", func() {
It("can subscribe to the topic", func() {
var ch chan<- int = make(chan int, defaultChSize)
sub, err := pubsub.Subscribe("room:123", ch)
Expect(err).NotTo(HaveOccurred())
err = sub.Unsubscribe()
Expect(err).NotTo(HaveOccurred())
})
})
Context("when the second argument is `<-chan T`", func() {
It("returns an error", func() {
var ch <-chan int = make(chan int, defaultChSize)
_, err := pubsub.Subscribe("room:123", ch)
Expect(err).To(MatchError(kiara.ErrArgumentMustBeChannel))
})
})
Context("when the second argument is not a channel", func() {
It("returns an error", func() {
var ch []int = make([]int, defaultChSize)
_, err := pubsub.Subscribe("room:123", ch)
Expect(err).To(MatchError(kiara.ErrArgumentMustBeChannel))
})
})
})
Describe("Publish", func() {
Context("when a topic is subscribed", func() {
It("sends a message to the subscriber", func() {
topic := "room:123"
ch := make(chan int, defaultChSize)
sub, err := pubsub.Subscribe(topic, ch)
Expect(err).NotTo(HaveOccurred())
defer func() { Expect(sub.Unsubscribe()).NotTo(HaveOccurred()) }()
ctx, cancel := context.WithTimeout(context.Background(), timeoutExpectedNotToExceed)
defer cancel()
var sent int = 123
err = pubsub.Publish(ctx, topic, sent)
Expect(err).NotTo(HaveOccurred())
select {
case received := <-ch:
Expect(received).To(Equal(sent))
case <-time.After(timeoutExpectedNotToExceed):
Fail("timeout")
}
})
})
Context("when a topic is not subscribed", func() {
It("does not send any message to the subscriber", func() {
topic := "room:123"
anotherTopic := "room:321"
ch := make(chan int, defaultChSize)
sub, err := pubsub.Subscribe(anotherTopic, ch)
Expect(err).NotTo(HaveOccurred())
defer func() { Expect(sub.Unsubscribe()).NotTo(HaveOccurred()) }()
ctx, cancel := context.WithTimeout(context.Background(), timeoutExpectedNotToExceed)
defer cancel()
var sent int = 123
err = pubsub.Publish(ctx, topic, sent)
Expect(err).NotTo(HaveOccurred())
select {
case msg := <-ch:
Fail(fmt.Sprintf("expected no message but got %v", msg))
case <-time.After(timeoutExpectedToExceed):
// OK
}
})
})
Context("when a topic was subscribed but is now unsubscribed", func() {
It("stops sending messages to the subscriber", func() {
topic := "room:123"
unsubscribed := false
ch := make(chan int, defaultChSize)
sub, err := pubsub.Subscribe(topic, ch)
Expect(err).NotTo(HaveOccurred())
defer func() {
if !unsubscribed {
Expect(sub.Unsubscribe()).NotTo(HaveOccurred())
}
}()
ctx, cancel := context.WithTimeout(context.Background(), timeoutExpectedNotToExceed)
defer cancel()
var sent int = 123
err = pubsub.Publish(ctx, topic, sent)
Expect(err).NotTo(HaveOccurred())
select {
case received := <-ch:
Expect(received).To(Equal(sent))
case <-time.After(timeoutExpectedNotToExceed):
Fail("timeout")
}
unsubscribed = true
err = sub.Unsubscribe()
Expect(err).NotTo(HaveOccurred())
ctx, cancel = context.WithTimeout(context.Background(), timeoutExpectedNotToExceed)
defer cancel()
sent = 456
err = pubsub.Publish(ctx, topic, sent)
Expect(err).NotTo(HaveOccurred())
select {
case msg := <-ch:
Fail(fmt.Sprintf("expected no message but got %v", msg))
case <-time.After(timeoutExpectedToExceed):
// OK
}
})
})
Context("when a topic is subscribed to by multiple channels", func() {
It("sends a message to all subscribers", func() {
topic := "room:123"
n := 3
chs := make([]chan int, 0, n)
for i := 0; i < n; i++ {
ch := make(chan int, defaultChSize)
sub, err := pubsub.Subscribe(topic, ch)
Expect(err).NotTo(HaveOccurred())
defer func() { Expect(sub.Unsubscribe()).NotTo(HaveOccurred()) }()
chs = append(chs, ch)
}
ctx, cancel := context.WithTimeout(context.Background(), timeoutExpectedNotToExceed)
defer cancel()
var sent int = 123
err := pubsub.Publish(ctx, topic, sent)
Expect(err).NotTo(HaveOccurred())
for i, ch := range chs {
select {
case received := <-ch:
Expect(received).To(Equal(sent))
case <-time.After(timeoutExpectedNotToExceed):
Fail(fmt.Sprintf("%d: timeout", i))
}
}
})
})
Context("when a topic is subscribed to by multiple channels and some of then stops subscribing", func() {
It("sends a message only to the channels that continues subscribing", func() {
topic := "room:123"
subAUnsubscribed := false
chA := make(chan int, defaultChSize)
subA, err := pubsub.Subscribe(topic, chA)
Expect(err).NotTo(HaveOccurred())
defer func() {
if !subAUnsubscribed {
Expect(subA.Unsubscribe()).NotTo(HaveOccurred())
}
}()
chB := make(chan int, defaultChSize)
subB, err := pubsub.Subscribe(topic, chB)
Expect(err).NotTo(HaveOccurred())
defer func() { Expect(subB.Unsubscribe()).NotTo(HaveOccurred()) }()
ctx, cancel := context.WithTimeout(context.Background(), timeoutExpectedNotToExceed)
defer cancel()
var sent int = 123
err = pubsub.Publish(ctx, topic, sent)
Expect(err).NotTo(HaveOccurred())
// ensure that all `ch`s are subscribing to the topic
for i, ch := range []chan int{chA, chB} {
select {
case received := <-ch:
Expect(received).To(Equal(sent))
case <-time.After(timeoutExpectedNotToExceed):
Fail(fmt.Sprintf("%d: timeout", i))
}
}
subAUnsubscribed = true
err = subA.Unsubscribe()
Expect(err).NotTo(HaveOccurred())
ctx, cancel = context.WithTimeout(context.Background(), timeoutExpectedNotToExceed)
defer cancel()
sent = 456
err = pubsub.Publish(ctx, topic, sent)
Expect(err).NotTo(HaveOccurred())
select {
case msg := <-chA:
Fail(fmt.Sprintf("A: expected no message but got %v", msg))
case <-time.After(timeoutExpectedToExceed):
// OK
}
select {
case received := <-chB:
Expect(received).To(Equal(sent))
case <-time.After(timeoutExpectedNotToExceed):
Fail("timeout")
}
})
})
})
})