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Add helper to detect empty configuration #122

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8 changes: 8 additions & 0 deletions config/util.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
package config

// IsZero reports whether the provided configuration struct is empty.
// This can be used to detect missing or unset configuration.
func IsZero[T comparable](cfg T) bool {
var zero T
return cfg == zero
}
21 changes: 21 additions & 0 deletions config/util_test.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
package config

import "testing"

type testConfig struct {
Name string
Port int
}

func TestIsZero(t *testing.T) {
var empty testConfig
nonEmpty := testConfig{Name: "chaos", Port: 8080}

if !IsZero(empty) {
t.Fatalf("expected empty config to be zero")
}

if IsZero(nonEmpty) {
t.Fatalf("expected non-empty config to not be zero")
}
}
8 changes: 4 additions & 4 deletions go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -59,10 +59,10 @@ github.com/ziutek/mymysql v1.5.4 h1:GB0qdRGsTwQSBVYuVShFBKaXSnSnYYC2d9knnE1LHFs=
github.com/ziutek/mymysql v1.5.4/go.mod h1:LMSpPZ6DbqWFxNCHW77HeMg9I646SAhApZ/wKdgO/C0=
golang.org/x/crypto v0.0.0-20160922170629-8e06e8ddd962 h1:mWFWs/KZ0R2cLgNYRn+C4pQvMDmpkqxF1Npt3NEAPg0=
golang.org/x/crypto v0.0.0-20160922170629-8e06e8ddd962/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/sys v0.0.0-20160916181909-8f0908ab3b24 h1:BL/wcoHkjubwHn2wDTAD1fehKZ9lf67KOVzucRKWPtM=
golang.org/x/sys v0.0.0-20160916181909-8f0908ab3b24/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.0.0-20160922232553-a7c023693a94 h1:QmdGgXvDlzDdp+l90rsC+qLFmFhl2nn+rSfBnS8P4zI=
golang.org/x/text v0.0.0-20160922232553-a7c023693a94/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/sys v0.5.0 h1:MUK/U/4lj1t1oPg0HfuXDN/Z1wv31ZJ/YcPiGccS4DU=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
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