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listener_test.go
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listener_test.go
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package pg_test
import (
"net"
"time"
"github.com/go-pg/pg/v10"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Context("Listener", func() {
var db *pg.DB
var ln *pg.Listener
BeforeEach(func() {
opt := pgOptions()
opt.PoolSize = 2
opt.PoolTimeout = time.Second
db = pg.Connect(opt)
ln = db.Listen(ctx, "test_channel")
})
_ = AfterEach(func() {
_ = ln.Close()
_ = db.Close()
})
It("implements Stringer", func() {
Expect(ln.String()).To(Equal("Listener(test_channel)"))
_ = ln.Channel()
Expect(ln.String()).To(Equal("Listener(test_channel, gopg:ping)"))
})
It("reuses connection", func() {
for i := 0; i < 100; i++ {
_, _, err := ln.ReceiveTimeout(ctx, time.Nanosecond)
Expect(err).To(HaveOccurred())
Expect(err.Error()).To(MatchRegexp(".+ i/o timeout"))
}
st := db.PoolStats()
Expect(st.Hits).To(Equal(uint32(0)))
Expect(st.Misses).To(Equal(uint32(0)))
Expect(st.Timeouts).To(Equal(uint32(0)))
Expect(st.TotalConns).To(Equal(uint32(1)))
Expect(st.IdleConns).To(Equal(uint32(0)))
})
It("listens for notifications", func() {
wait := make(chan struct{}, 2)
go func() {
defer GinkgoRecover()
wait <- struct{}{}
channel, payload, err := ln.Receive(ctx)
Expect(err).NotTo(HaveOccurred())
Expect(channel).To(Equal("test_channel"))
Expect(payload).To(Equal(""))
wait <- struct{}{}
}()
select {
case <-wait:
// ok
case <-time.After(3 * time.Second):
Fail("timeout")
}
_, err := db.Exec("NOTIFY test_channel")
Expect(err).NotTo(HaveOccurred())
select {
case <-wait:
// ok
case <-time.After(3 * time.Second):
Fail("timeout")
}
})
It("is closed when DB is closed", func() {
wait := make(chan struct{}, 2)
go func() {
defer GinkgoRecover()
wait <- struct{}{}
_, _, err := ln.Receive(ctx)
Expect(err).ToNot(BeNil())
Expect(err.Error()).To(SatisfyAny(
Equal("EOF"),
MatchRegexp(`use of closed (file or )?network connection$`),
))
wait <- struct{}{}
}()
select {
case <-wait:
// ok
case <-time.After(time.Second):
Fail("timeout")
}
select {
case <-wait:
Fail("Receive is not blocked")
case <-time.After(time.Second):
// ok
}
Expect(db.Close()).To(BeNil())
select {
case <-wait:
// ok
case <-time.After(3 * time.Second):
Fail("Listener is not closed")
}
_, _, err := ln.Receive(ctx)
Expect(err).To(MatchError("pg: listener is closed"))
err = ln.Close()
Expect(err).To(MatchError("pg: listener is closed"))
})
It("returns an error on timeout", func() {
channel, payload, err := ln.ReceiveTimeout(ctx, time.Second)
Expect(err.(net.Error).Timeout()).To(BeTrue())
Expect(channel).To(Equal(""))
Expect(payload).To(Equal(""))
})
It("reconnects on bad connection", func() {
cn := ln.CurrentConn()
Expect(cn).NotTo(BeNil())
cn.SetNetConn(&badConn{})
err := ln.Listen(ctx, "test_channel2")
Expect(err).Should(MatchError("bad connection"))
err = ln.Listen(ctx, "test_channel2")
Expect(err).NotTo(HaveOccurred())
})
It("reconnects on receive error", func() {
cn := ln.CurrentConn()
Expect(cn).NotTo(BeNil())
cn.SetNetConn(&badConn{})
_, _, err := ln.ReceiveTimeout(ctx, time.Second)
Expect(err).Should(MatchError("bad connection"))
_, _, err = ln.ReceiveTimeout(ctx, time.Second)
Expect(err.(net.Error).Timeout()).To(BeTrue())
wait := make(chan struct{}, 2)
go func() {
defer GinkgoRecover()
wait <- struct{}{}
_, _, lnerr := ln.Receive(ctx)
Expect(lnerr).NotTo(HaveOccurred())
wait <- struct{}{}
}()
select {
case <-wait:
// ok
case <-time.After(3 * time.Second):
Fail("timeout")
}
select {
case <-wait:
Fail("Receive is not blocked")
case <-time.After(time.Second):
// ok
}
_, err = db.Exec("NOTIFY test_channel")
Expect(err).NotTo(HaveOccurred())
select {
case <-wait:
// ok
case <-time.After(3 * time.Second):
Fail("timeout")
}
})
It("supports concurrent Listen and Receive", func() {
const N = 100
wg := performAsync(N, func(_ int) {
_, err := db.Exec("NOTIFY test_channel")
Expect(err).NotTo(HaveOccurred())
})
done := make(chan struct{})
go func() {
defer GinkgoRecover()
for i := 0; i < N; i++ {
_, _, err := ln.ReceiveTimeout(ctx, 5*time.Second)
Expect(err).NotTo(HaveOccurred())
}
close(done)
}()
for i := 0; i < N; i++ {
err := ln.Listen(ctx, "test_channel")
Expect(err).NotTo(HaveOccurred())
}
select {
case <-done:
wg.Wait()
case <-time.After(30 * time.Second):
Fail("timeout")
}
})
})