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package gbytes_test
import (
"io"
"time"
. "github.com/onsi/gomega/gbytes"
"bytes"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
type SlowReader struct {
R io.Reader
D time.Duration
}
func (s SlowReader) Read(p []byte) (int, error) {
time.Sleep(s.D)
return s.R.Read(p)
}
var _ = Describe("Buffer", func() {
var buffer *Buffer
BeforeEach(func() {
buffer = NewBuffer()
})
Describe("dumping the entire contents of the buffer", func() {
It("should return everything that's been written", func() {
buffer.Write([]byte("abc"))
buffer.Write([]byte("def"))
Expect(buffer.Contents()).Should(Equal([]byte("abcdef")))
Expect(buffer).Should(Say("bcd"))
Expect(buffer.Contents()).Should(Equal([]byte("abcdef")))
})
})
Describe("creating a buffer with bytes", func() {
It("should create the buffer with the cursor set to the beginning", func() {
buffer := BufferWithBytes([]byte("abcdef"))
Expect(buffer.Contents()).Should(Equal([]byte("abcdef")))
Expect(buffer).Should(Say("abc"))
Expect(buffer).ShouldNot(Say("abc"))
Expect(buffer).Should(Say("def"))
})
})
Describe("creating a buffer that wraps a reader", func() {
Context("for a well-behaved reader", func() {
It("should buffer the contents of the reader", func() {
reader := bytes.NewBuffer([]byte("abcdef"))
buffer := BufferReader(reader)
Eventually(buffer).Should(Say("abc"))
Expect(buffer).ShouldNot(Say("abc"))
Eventually(buffer).Should(Say("def"))
Eventually(buffer.Closed).Should(BeTrue())
})
})
Context("for a slow reader", func() {
It("should allow Eventually to time out", func() {
slowReader := SlowReader{
R: bytes.NewBuffer([]byte("abcdef")),
D: time.Second,
}
buffer := BufferReader(slowReader)
failures := InterceptGomegaFailures(func() {
Eventually(buffer, 100*time.Millisecond).Should(Say("abc"))
})
Expect(failures).ShouldNot(BeEmpty())
fastReader := SlowReader{
R: bytes.NewBuffer([]byte("abcdef")),
D: time.Millisecond,
}
buffer = BufferReader(fastReader)
Eventually(buffer, 100*time.Millisecond).Should(Say("abc"))
Eventually(buffer.Closed).Should(BeTrue())
})
})
})
Describe("reading from a buffer", func() {
It("should read the current contents of the buffer", func() {
buffer := BufferWithBytes([]byte("abcde"))
dest := make([]byte, 3)
n, err := buffer.Read(dest)
Expect(err).ShouldNot(HaveOccurred())
Expect(n).Should(Equal(3))
Expect(string(dest)).Should(Equal("abc"))
dest = make([]byte, 3)
n, err = buffer.Read(dest)
Expect(err).ShouldNot(HaveOccurred())
Expect(n).Should(Equal(2))
Expect(string(dest[:n])).Should(Equal("de"))
n, err = buffer.Read(dest)
Expect(err).Should(Equal(io.EOF))
Expect(n).Should(Equal(0))
})
Context("after the buffer has been closed", func() {
It("returns an error", func() {
buffer := BufferWithBytes([]byte("abcde"))
buffer.Close()
dest := make([]byte, 3)
n, err := buffer.Read(dest)
Expect(err).Should(HaveOccurred())
Expect(n).Should(Equal(0))
})
})
})
Describe("detecting regular expressions", func() {
It("should fire the appropriate channel when the passed in pattern matches, then close it", func(done Done) {
go func() {
time.Sleep(10 * time.Millisecond)
buffer.Write([]byte("abcde"))
}()
A := buffer.Detect("%s", "a.c")
B := buffer.Detect("def")
var gotIt bool
select {
case gotIt = <-A:
case <-B:
Fail("should not have gotten here")
}
Expect(gotIt).Should(BeTrue())
Eventually(A).Should(BeClosed())
buffer.Write([]byte("f"))
Eventually(B).Should(Receive())
Eventually(B).Should(BeClosed())
close(done)
})
It("should fast-forward the buffer upon detection", func(done Done) {
buffer.Write([]byte("abcde"))
<-buffer.Detect("abc")
Expect(buffer).ShouldNot(Say("abc"))
Expect(buffer).Should(Say("de"))
close(done)
})
It("should only fast-forward the buffer when the channel is read, and only if doing so would not rewind it", func(done Done) {
buffer.Write([]byte("abcde"))
A := buffer.Detect("abc")
time.Sleep(20 * time.Millisecond) //give the goroutine a chance to detect and write to the channel
Expect(buffer).Should(Say("abcd"))
<-A
Expect(buffer).ShouldNot(Say("d"))
Expect(buffer).Should(Say("e"))
Eventually(A).Should(BeClosed())
close(done)
})
It("should be possible to cancel a detection", func(done Done) {
A := buffer.Detect("abc")
B := buffer.Detect("def")
buffer.CancelDetects()
buffer.Write([]byte("abcdef"))
Eventually(A).Should(BeClosed())
Eventually(B).Should(BeClosed())
Expect(buffer).Should(Say("bcde"))
<-buffer.Detect("f")
close(done)
})
})
Describe("closing the buffer", func() {
It("should error when further write attempts are made", func() {
_, err := buffer.Write([]byte("abc"))
Expect(err).ShouldNot(HaveOccurred())
buffer.Close()
_, err = buffer.Write([]byte("def"))
Expect(err).Should(HaveOccurred())
Expect(buffer.Contents()).Should(Equal([]byte("abc")))
})
It("should be closed", func() {
Expect(buffer.Closed()).Should(BeFalse())
buffer.Close()
Expect(buffer.Closed()).Should(BeTrue())
})
})
})
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