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Allow metric and label names to begin with underscores (#2961)

Browse source 
While this is not recommended, it is allowed in our data model
(https://prometheus.io/docs/concepts/data_model/).

Fixes https://github.com/prometheus/prometheus/issues/2959
This commit is contained in:
Julius Volz 2017-07-18 12:35:41 +02:00 committed by GitHub
parent 931f2705f2
commit c6f41ce391
3 changed files with 22 additions and 14 deletions
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5
pkg/textparse/lex.l
View file

@ -51,7 +51,6 @@ func (l *lexer) Lex() int {
%}
D [0-9]
S [a-zA-Z]
L [a-zA-Z_]
M [a-zA-Z_:]
@ -69,7 +68,7 @@ M [a-zA-Z_:]
#[^\r\n]*\n l.mstart = l.i
[\r\n \t]+ l.mstart = l.i
{S}({M}|{D})* l.state = lstateName
{M}({M}|{D})* l.state = lstateName
l.offsets = append(l.offsets, l.i)
l.mend = l.i
@ -85,7 +84,7 @@ M [a-zA-Z_:]
<lstateLabels>(,?[ \t]*) l.state = lstateLName
l.offsets = append(l.offsets, l.i)
<lstateLName>{S}({L}|{D})* l.offsets = append(l.offsets, l.i)
<lstateLName>{L}({L}|{D})* l.offsets = append(l.offsets, l.i)
<lstateLName>[ \t]*= l.state = lstateLValue
<lstateLValue>[ \t]+

11
pkg/textparse/lex.l.go
View file

@ -83,12 +83,12 @@ yystart1:
goto yyabort
case c == '#':
goto yystate4
case c == ':' || c >= 'A' && c <= 'Z' || c == '_' || c >= 'a' && c <= 'z':
goto yystate6
case c == '\t' || c == '\n' || c == '\r' || c == ' ':
goto yystate3
case c == '\x00':
goto yystate2
case c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z':
goto yystate6
}
yystate2:
@ -327,7 +327,7 @@ yystart26:
goto yystate28
case c == '\t' || c == ' ':
goto yystate27
case c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z':
case c >= 'A' && c <= 'Z' || c == '_' || c >= 'a' && c <= 'z':
goto yystate29
}
@ -436,7 +436,7 @@ yyrule3: // [\r\n \t]+
l.mstart = l.i
goto yystate0
}
yyrule4: // {S}({M}|{D})*
yyrule4: // {M}({M}|{D})*
{
l.state = lstateName
l.offsets = append(l.offsets, l.i)
@ -469,7 +469,7 @@ yyrule9: // (,?[ \t]*)
l.offsets = append(l.offsets, l.i)
goto yystate0
}
yyrule10: // {S}({L}|{D})*
yyrule10: // {L}({L}|{D})*
{
l.offsets = append(l.offsets, l.i)
goto yystate0
@ -543,7 +543,6 @@ yyrule20: // [\r\n]+
yyrule21: // \0
{
return 1
}
panic("unreachable")

12
pkg/textparse/parse_test.go
View file

@ -43,7 +43,9 @@ go_gc_duration_seconds_count 99
some:aggregate:rate5m{a_b="c"} 1
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 33 123123`
go_goroutines 33 123123
_metric_starting_with_underscore 1
testmetric{_label_starting_with_underscore="foo"} 1`
input += "\nnull_byte_metric{a=\"abc\x00\"} 1"
int64p := func(x int64) *int64 { return &x }
@ -103,6 +105,14 @@ go_goroutines 33 123123`
v: 33,
t: int64p(123123),
lset: labels.FromStrings("__name__", "go_goroutines"),
}, {
m: "_metric_starting_with_underscore",
v: 1,
lset: labels.FromStrings("__name__", "_metric_starting_with_underscore"),
}, {
m: "testmetric{_label_starting_with_underscore=\"foo\"}",
v: 1,
lset: labels.FromStrings("__name__", "testmetric", "_label_starting_with_underscore", "foo"),
}, {
m: "null_byte_metric{a=\"abc\x00\"}",
v: 1,