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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"fmt"
"strings"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Utils", func() {
Describe("FormatChainName", func() {
It("must format a short name", func() {
chain := FormatChainName("test", "1234")
Expect(len(chain)).To(Equal(maxChainLength))
Expect(chain).To(Equal("CNI-2bbe0c48b91a7d1b8a6753a8"))
})
It("must truncate a long name", func() {
chain := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
Expect(len(chain)).To(Equal(maxChainLength))
Expect(chain).To(Equal("CNI-374f33fe84ab0ed84dcdebe3"))
})
It("must be predictable", func() {
chain1 := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
chain2 := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
Expect(len(chain1)).To(Equal(maxChainLength))
Expect(len(chain2)).To(Equal(maxChainLength))
Expect(chain1).To(Equal(chain2))
})
It("must change when a character changes", func() {
chain1 := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
chain2 := FormatChainName("testalongnamethatdoesnotmakesense", "1235")
Expect(len(chain1)).To(Equal(maxChainLength))
Expect(len(chain2)).To(Equal(maxChainLength))
Expect(chain1).To(Equal("CNI-374f33fe84ab0ed84dcdebe3"))
Expect(chain1).NotTo(Equal(chain2))
})
})
Describe("MustFormatChainNameWithPrefix", func() {
It("generates a chain name with a prefix", func() {
chain := MustFormatChainNameWithPrefix("test", "1234", "PREFIX-")
Expect(len(chain)).To(Equal(maxChainLength))
Expect(chain).To(Equal("CNI-PREFIX-2bbe0c48b91a7d1b8"))
})
It("must format a short name", func() {
chain := MustFormatChainNameWithPrefix("test", "1234", "PREFIX-")
Expect(len(chain)).To(Equal(maxChainLength))
Expect(chain).To(Equal("CNI-PREFIX-2bbe0c48b91a7d1b8"))
})
It("must truncate a long name", func() {
chain := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
Expect(len(chain)).To(Equal(maxChainLength))
Expect(chain).To(Equal("CNI-PREFIX-374f33fe84ab0ed84"))
})
It("must be predictable", func() {
chain1 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
chain2 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
Expect(len(chain1)).To(Equal(maxChainLength))
Expect(len(chain2)).To(Equal(maxChainLength))
Expect(chain1).To(Equal(chain2))
})
It("must change when a character changes", func() {
chain1 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
chain2 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1235", "PREFIX-")
Expect(len(chain1)).To(Equal(maxChainLength))
Expect(len(chain2)).To(Equal(maxChainLength))
Expect(chain1).To(Equal("CNI-PREFIX-374f33fe84ab0ed84"))
Expect(chain1).NotTo(Equal(chain2))
})
It("panics when prefix is too large", func() {
longPrefix := strings.Repeat("PREFIX-", 4)
Expect(func() {
MustFormatChainNameWithPrefix("test", "1234", longPrefix)
}).To(Panic())
})
})
Describe("MustFormatHashWithPrefix", func() {
It("always returns a string with the given prefix", func() {
Expect(MustFormatHashWithPrefix(10, "AAA", "some string")).To(HavePrefix("AAA"))
Expect(MustFormatHashWithPrefix(10, "foo", "some string")).To(HavePrefix("foo"))
Expect(MustFormatHashWithPrefix(10, "bar", "some string")).To(HavePrefix("bar"))
})
It("always returns a string of the given length", func() {
Expect(MustFormatHashWithPrefix(10, "AAA", "some string")).To(HaveLen(10))
Expect(MustFormatHashWithPrefix(15, "AAA", "some string")).To(HaveLen(15))
Expect(MustFormatHashWithPrefix(5, "AAA", "some string")).To(HaveLen(5))
})
It("is deterministic", func() {
val1 := MustFormatHashWithPrefix(10, "AAA", "some string")
val2 := MustFormatHashWithPrefix(10, "AAA", "some string")
val3 := MustFormatHashWithPrefix(10, "AAA", "some string")
Expect(val1).To(Equal(val2))
Expect(val1).To(Equal(val3))
})
It("is (nearly) perfect (injective function)", func() {
hashes := map[string]int{}
for i := 0; i < 1000; i++ {
name := fmt.Sprintf("string %d", i)
hashes[MustFormatHashWithPrefix(8, "", name)]++
}
for key, count := range hashes {
Expect(count).To(Equal(1), "for key "+key+" got non-unique correspondence")
}
})
assertPanicWith := func(f func(), expectedErrorMessage string) {
defer func() {
Expect(recover()).To(Equal(expectedErrorMessage))
}()
f()
Fail("function should have panicked but did not")
}
It("panics when prefix is longer than the length", func() {
assertPanicWith(
func() { MustFormatHashWithPrefix(3, "AAA", "some string") },
"invalid length",
)
})
It("panics when length is not positive", func() {
assertPanicWith(
func() { MustFormatHashWithPrefix(0, "", "some string") },
"invalid length",
)
})
It("panics when length is larger than MaxLen", func() {
assertPanicWith(
func() { MustFormatHashWithPrefix(MaxHashLen+1, "", "some string") },
"invalid length",
)
})
})
})
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