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package self
import (
"bytes"
"fmt"
"math/rand"
"github.com/marten-seemann/qpack"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Self Tests", func() {
getEncoder := func() (*qpack.Encoder, *bytes.Buffer) {
output := &bytes.Buffer{}
return qpack.NewEncoder(output), output
}
randomString := func(l int) string {
const charset = "abcdefghijklmnopqrstuvwxyz" +
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
s := make([]byte, l)
for i := range s {
s[i] = charset[rand.Intn(len(charset))]
}
return string(s)
}
It("encodes and decodes a single header field", func() {
hf := qpack.HeaderField{
Name: randomString(15),
Value: randomString(15),
}
encoder, output := getEncoder()
Expect(encoder.WriteField(hf)).To(Succeed())
headerFields, err := qpack.NewDecoder(nil).DecodeFull(output.Bytes())
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(Equal([]qpack.HeaderField{hf}))
})
It("encodes and decodes multiple header fields", func() {
hfs := []qpack.HeaderField{
{Name: "foo", Value: "bar"},
{Name: "lorem", Value: "ipsum"},
{Name: randomString(15), Value: randomString(20)},
}
encoder, output := getEncoder()
for _, hf := range hfs {
Expect(encoder.WriteField(hf)).To(Succeed())
}
headerFields, err := qpack.NewDecoder(nil).DecodeFull(output.Bytes())
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(Equal(hfs))
})
It("encodes and decodes multiple requests", func() {
hfs1 := []qpack.HeaderField{{Name: "foo", Value: "bar"}}
hfs2 := []qpack.HeaderField{
{Name: "lorem", Value: "ipsum"},
{Name: randomString(15), Value: randomString(20)},
}
encoder, output := getEncoder()
for _, hf := range hfs1 {
Expect(encoder.WriteField(hf)).To(Succeed())
}
req1 := append([]byte{}, output.Bytes()...)
output.Reset()
for _, hf := range hfs2 {
Expect(encoder.WriteField(hf)).To(Succeed())
}
req2 := append([]byte{}, output.Bytes()...)
var headerFields []qpack.HeaderField
decoder := qpack.NewDecoder(func(hf qpack.HeaderField) { headerFields = append(headerFields, hf) })
_, err := decoder.Write(req1)
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(Equal(hfs1))
headerFields = nil
_, err = decoder.Write(req2)
Expect(err).ToNot(HaveOccurred())
Expect(headerFields).To(Equal(hfs2))
})
// replace one character by a random character at a random position
replaceRandomCharacter := func(s string) string {
pos := rand.Intn(len(s))
new := s[:pos]
for {
if c := randomString(1); c != string(s[pos]) {
new += c
break
}
}
new += s[pos+1:]
return new
}
check := func(encoded []byte, hf qpack.HeaderField) {
headerFields, err := qpack.NewDecoder(nil).DecodeFull(encoded)
ExpectWithOffset(1, err).ToNot(HaveOccurred())
ExpectWithOffset(1, headerFields).To(HaveLen(1))
ExpectWithOffset(1, headerFields[0]).To(Equal(hf))
}
// use an entry with a value, for example "set-cookie"
It("uses the static table for field names, for fields without values", func() {
var hf qpack.HeaderField
for {
if entry := staticTable[rand.Intn(len(staticTable))]; len(entry.Value) == 0 {
hf = qpack.HeaderField{Name: entry.Name}
break
}
}
encoder, output := getEncoder()
Expect(encoder.WriteField(hf)).To(Succeed())
encodedLen := output.Len()
check(output.Bytes(), hf)
encoder, output = getEncoder()
oldName := hf.Name
hf.Name = replaceRandomCharacter(hf.Name)
Expect(encoder.WriteField(hf)).To(Succeed())
fmt.Fprintf(GinkgoWriter, "Encoding field name:\n\t%s: %d bytes\n\t%s: %d bytes\n", oldName, encodedLen, hf.Name, output.Len())
Expect(output.Len()).To(BeNumerically(">", encodedLen))
})
// use an entry with a value, for example "set-cookie",
// but now use a custom value
It("uses the static table for field names, for fields without values", func() {
var hf qpack.HeaderField
for {
if entry := staticTable[rand.Intn(len(staticTable))]; len(entry.Value) == 0 {
hf = qpack.HeaderField{
Name: entry.Name,
Value: randomString(5),
}
break
}
}
encoder, output := getEncoder()
Expect(encoder.WriteField(hf)).To(Succeed())
encodedLen := output.Len()
check(output.Bytes(), hf)
encoder, output = getEncoder()
oldName := hf.Name
hf.Name = replaceRandomCharacter(hf.Name)
Expect(encoder.WriteField(hf)).To(Succeed())
fmt.Fprintf(GinkgoWriter, "Encoding field name:\n\t%s: %d bytes\n\t%s: %d bytes\n", oldName, encodedLen, hf.Name, output.Len())
Expect(output.Len()).To(BeNumerically(">", encodedLen))
})
// use an entry with a value, for example
// cache-control -> Value: "max-age=0"
// but encode a different value
// cache-control -> xyz
It("uses the static table for field names, for fields with values", func() {
var hf qpack.HeaderField
for {
// Only use values with at least 2 characters.
// This makes sure that Huffman enocding doesn't compress them as much as encoding it using the static table would.
if entry := staticTable[rand.Intn(len(staticTable))]; len(entry.Value) > 1 {
hf = qpack.HeaderField{
Name: entry.Name,
Value: randomString(20),
}
break
}
}
encoder, output := getEncoder()
Expect(encoder.WriteField(hf)).To(Succeed())
encodedLen := output.Len()
check(output.Bytes(), hf)
encoder, output = getEncoder()
oldName := hf.Name
hf.Name = replaceRandomCharacter(hf.Name)
Expect(encoder.WriteField(hf)).To(Succeed())
fmt.Fprintf(GinkgoWriter, "Encoding field name:\n\t%s: %d bytes\n\t%s: %d bytes\n", oldName, encodedLen, hf.Name, output.Len())
Expect(output.Len()).To(BeNumerically(">", encodedLen))
})
It("uses the static table for field values", func() {
var hf qpack.HeaderField
for {
// Only use values with at least 2 characters.
// This makes sure that Huffman enocding doesn't compress them as much as encoding it using the static table would.
if entry := staticTable[rand.Intn(len(staticTable))]; len(entry.Value) > 1 {
hf = qpack.HeaderField{
Name: entry.Name,
Value: entry.Value,
}
break
}
}
encoder, output := getEncoder()
Expect(encoder.WriteField(hf)).To(Succeed())
encodedLen := output.Len()
check(output.Bytes(), hf)
encoder, output = getEncoder()
oldValue := hf.Value
hf.Value = replaceRandomCharacter(hf.Value)
Expect(encoder.WriteField(hf)).To(Succeed())
fmt.Fprintf(GinkgoWriter,
"Encoding field value:\n\t%s: %s -> %d bytes\n\t%s: %s -> %d bytes\n",
hf.Name, oldValue, encodedLen,
hf.Name, hf.Value, output.Len(),
)
Expect(output.Len()).To(BeNumerically(">", encodedLen))
})
})
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