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iptables: add idempotent functions

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Add the following idempotent functions to iptables utils:

DeleteRule: idempotently delete an iptables rule
DeleteChain: idempotently delete an iptables chain
ClearChain: idempotently flush an iptables chain

Signed-off-by: Antonio Ojea <antonio.ojea.garcia@gmail.com>
This commit is contained in:
Antonio Ojea
2019-12-12 14:03:33 +01:00
parent 3603738c6a
commit bf8f171041
3 changed files with 88 additions and 36 deletions
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31
pkg/utils/iptables_test.go
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@ -67,12 +67,31 @@ var _ = Describe("chain tests", func() {
cleanup()
})
It("creates chains idempotently", func() {
err := EnsureChain(ipt, TABLE, testChain)
Expect(err).NotTo(HaveOccurred())
Describe("EnsureChain", func() {
It("creates chains idempotently", func() {
err := EnsureChain(ipt, TABLE, testChain)
Expect(err).NotTo(HaveOccurred())
// Create it again!
err = EnsureChain(ipt, TABLE, testChain)
Expect(err).NotTo(HaveOccurred())
// Create it again!
err = EnsureChain(ipt, TABLE, testChain)
Expect(err).NotTo(HaveOccurred())
})
})
Describe("DeleteChain", func() {
It("delete chains idempotently", func() {
// Create chain
err := EnsureChain(ipt, TABLE, testChain)
Expect(err).NotTo(HaveOccurred())
// Delete chain
err = DeleteChain(ipt, TABLE, testChain)
Expect(err).NotTo(HaveOccurred())
// Delete it again!
err = DeleteChain(ipt, TABLE, testChain)
Expect(err).NotTo(HaveOccurred())
})
})
})