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Labels.Has quick check on first character

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Exit early if we've gone past - labels are sorted in order.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2023-08-13 14:56:15 +01:00
parent 33aab1b2cc
commit b5c6807fea
1 changed files with 18 additions and 5 deletions
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23
model/labels/labels_stringlabels.go
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@ -300,13 +300,26 @@ func (ls Labels) Get(name string) string {
// Has returns true if the label with the given name is present. // Has returns true if the label with the given name is present.
func (ls Labels) Has(name string) bool { func (ls Labels) Has(name string) bool {
if name == "" { // Avoid crash in loop if someone asks for "".
return false // Prometheus does not store blank label names.
}
for i := 0; i < len(ls.data); { for i := 0; i < len(ls.data); {
var lName string var size int
lName, i = decodeString(ls.data, i) size, i = decodeSize(ls.data, i)
_, i = decodeString(ls.data, i) if ls.data[i] == name[0] {
if lName == name { lName := ls.data[i : i+size]
return true i += size
if lName == name {
return true
}
} else {
if ls.data[i] > name[0] { // Stop looking if we've gone past.
break
}
i += size
} }
size, i = decodeSize(ls.data, i)
i += size
} }
return false return false
} }