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vault: detect namespace change in config reload #14298

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merged 3 commits into from
Aug 24, 2022
Merged

vault: detect namespace change in config reload #14298

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b2c2ab5
vault: detect namespace change in config reload
tgross Aug 24, 2022
9692586
add accessor method for testing
tgross Aug 24, 2022
3f63499
fix TLSSkipVerify comparison too
tgross Aug 24, 2022
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8 changes: 7 additions & 1 deletion nomad/structs/config/vault.go
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Original file line number Diff line number Diff line change
Expand Up @@ -245,9 +245,15 @@ func (c *VaultConfig) Equals(b *VaultConfig) bool {
if c.TLSKeyFile != b.TLSKeyFile {
return false
}
if c.TLSSkipVerify != b.TLSSkipVerify {

if c.TLSSkipVerify == nil || b.TLSSkipVerify == nil {
if c.TLSSkipVerify != b.TLSSkipVerify {
return false
}
} else if *c.TLSSkipVerify != *b.TLSSkipVerify {
Comment on lines +249 to +253
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i was thinking, maybe we could have pointer.Compare similar to (and replacing) helper.CompareTimePtrs - caveat being it should only be used on basic types (not on structs with also pointer fields)

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Good idea, lemme take a crack at that.

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@shoenig shoenig Aug 24, 2022 •
edited

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caveat being it should only be used on basic types

what am I thinking, we can enforce that with a type parameter constraint!

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@shoenig shoenig Aug 24, 2022 •
edited

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pretty sure this is effectively what we'd want

// Compare returns whether a and b contain the same value.
func Compare[A constraints.Ordered](a, b *A) bool {
// but also check nil
	return *a == *b
}```

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@schmichael schmichael Aug 24, 2022 •
edited

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Yeah, something like this? https://go.dev/play/p/nE1aQVTzsuz

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the problem is I want to prevent comparisons like this:

https://go.dev/play/p/Lh26c-YWmBd

using constraints.Ordered as a constraint prevents comparing pointers of anything but underlying Numeric/String types which are safe

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hrm, I seem to be stuck there.

type primitivePointer interface {
	*bool | *string | *int // etc, we can add the rest here
}

// Compare is an equality check for pointers that point to primitives.
func Compare[A primitivePointer](a, b A) bool {
	if a == nil || b == nil {
		return a == b
	}

	return *a == *b
}

Gives me:

# github.com/hashicorp/nomad/helper/pointer
helper/pointer/pointer.go:28:10: invalid operation: pointers of a (variable of type A constrained by primitivePointer) must have identical base types
helper/pointer/pointer.go:28:16: invalid operation: pointers of b (variable of type A constrained by primitivePointer) must have identical base types

For now I'm going to merge the bugfix and then we'll come up with some nicer comparison functions in a separate PR.

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Ah, I posted that without seeing the other solutions. In any case, probably better for another PR.

return false
}

if c.TLSServerName != b.TLSServerName {
return false
}
Expand Down
9 changes: 3 additions & 6 deletions nomad/structs/config/vault_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,10 +5,9 @@ import (
"testing"
"time"

"github.com/stretchr/testify/require"

"github.com/hashicorp/nomad/ci"
"github.com/hashicorp/nomad/helper/pointer"
"github.com/shoenig/test/must"
)

func TestVaultConfig_Merge(t *testing.T) {
Expand Down Expand Up @@ -102,8 +101,7 @@ func TestVaultConfig_Equals(t *testing.T) {
TLSServerName: "1",
}

// TODO: must.Equals(t, c, c2) should work here?
require.True(t, c.Equals(c2))
must.Equals(t, c1, c2)

c3 := &VaultConfig{
Enabled: pointer.Of(true),
Expand Down Expand Up @@ -139,6 +137,5 @@ func TestVaultConfig_Equals(t *testing.T) {
TLSServerName: "1",
}

// TODO: must.NotEquals(t, c3, c4) should work here?
require.False(t, c3.Equals(c4))
must.NotEquals(t, c3, c4)
}