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Add new & improved glob matcher #457

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merged 10 commits into from
Mar 11, 2018
Merged

Add new & improved glob matcher #457

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48dbe18
Add new and improved glob matcher
Feb 28, 2018
6e2b05b
Vendoring in version 19c076cdf202b3d1c0489bdfa2f2f289f634474b of gobw…
Feb 28, 2018
6cd642b
Use one glob matcher & cache compiled pattern in route table
Mar 1, 2018
e13a5a8
Rename Matcher to Glob
Mar 6, 2018
c19bd67
Handle glob compilation error
Mar 6, 2018
6b7a0ef
Refactor glob matcher test
Mar 6, 2018
1eb27b9
Compile matcher on adding route to existing host
Mar 6, 2018
59d967d
Remove go-glob usage
Mar 6, 2018
9d1d82a
Fix doc-string
Mar 6, 2018
315cde9
Vendoring out version 572520ed46dbddaed19ea3d9541bdd0494163693 of git…
Mar 6, 2018
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11 changes: 2 additions & 9 deletions route/matcher.go
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Original file line number Diff line number Diff line change
@@ -1,8 +1,6 @@
package route

import (
"log"
"path"
"strings"
)

Expand All @@ -21,12 +19,7 @@ func prefixMatcher(uri string, r *Route) bool {
return strings.HasPrefix(uri, r.Path)
}

// globMatcher matches path to the routes' path using globbing.
// globMatcher matches path to the routes' path using gobwas/glob.
func globMatcher(uri string, r *Route) bool {
var hasMatch, err = path.Match(r.Path, uri)
if err != nil {
log.Printf("[ERROR] Glob matching error %s for path %s route %s", err, uri, r.Path)
return false
}
return hasMatch
return r.Glob.Match(uri)
}
6 changes: 6 additions & 0 deletions route/matcher_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@ package route

import (
"testing"

"github.com/gobwas/glob"
)

func TestPrefixMatcher(t *testing.T) {
Expand Down Expand Up @@ -38,16 +40,20 @@ func TestGlobMatcher(t *testing.T) {
{uri: "/fools", matches: true, route: &Route{Path: "/foo*"}},
{uri: "/fools", matches: true, route: &Route{Path: "/foo*"}},
{uri: "/foo/x/bar", matches: true, route: &Route{Path: "/foo/*/bar"}},
{uri: "/foo/x/y/z/w/bar", matches: true, route: &Route{Path: "/foo/**"}},
{uri: "/foo/x/y/z/w/bar", matches: true, route: &Route{Path: "/foo/**/bar"}},

// error flows
{uri: "/fo", matches: false, route: &Route{Path: "/foo"}},
{uri: "/fools", matches: false, route: &Route{Path: "/foo"}},
{uri: "/fo", matches: false, route: &Route{Path: "/foo*"}},
{uri: "/fools", matches: false, route: &Route{Path: "/foo.*"}},
{uri: "/foo/x/y/z/w/baz", matches: false, route: &Route{Path: "/foo/**/bar"}},
}

for _, tt := range tests {
t.Run(tt.uri, func(t *testing.T) {
tt.route.Glob = glob.MustCompile(tt.route.Path)
if got, want := globMatcher(tt.uri, tt.route), tt.matches; got != want {
t.Fatalf("got %v want %v", got, want)
}
Expand Down
4 changes: 4 additions & 0 deletions route/route.go
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ import (
"strings"

"github.com/fabiolb/fabio/metrics"
"github.com/gobwas/glob"
)

// Route maps a path prefix to one or more target URLs.
Expand All @@ -36,6 +37,9 @@ type Route struct {
// total contains the total number of requests for this route.
// Used by the RRPicker
total uint64

// Glob represents compiled pattern.
Glob glob.Glob
}

func (r *Route) addTarget(service string, targetURL *url.URL, fixedWeight float64, tags []string, opts map[string]string) {
Expand Down
17 changes: 13 additions & 4 deletions route/table.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ import (
"sync/atomic"

"github.com/fabiolb/fabio/metrics"
"github.com/ryanuber/go-glob"
"github.com/gobwas/glob"
)

var errInvalidPrefix = errors.New("route: prefix must not be empty")
Expand Down Expand Up @@ -153,13 +153,21 @@ func (t Table) addRoute(d *RouteDef) error {
switch {
// add new host
case t[host] == nil:
r := &Route{Host: host, Path: path}
g, err := glob.Compile(path)
if err != nil {
return err
}
r := &Route{Host: host, Path: path, Glob: g}
r.addTarget(d.Service, targetURL, d.Weight, d.Tags, d.Opts)
t[host] = Routes{r}

// add new route to existing host
case t[host].find(path) == nil:
r := &Route{Host: host, Path: path}
g, err := glob.Compile(path)
if err != nil {
return err
}
r := &Route{Host: host, Path: path, Glob: g}
r.addTarget(d.Service, targetURL, d.Weight, d.Tags, d.Opts)
t[host] = append(t[host], r)
sort.Sort(t[host])
Expand Down Expand Up @@ -290,7 +298,8 @@ func (t Table) matchingHosts(req *http.Request) (hosts []string) {
host := normalizeHost(req.Host, req.TLS != nil)
for pattern := range t {
normpat := normalizeHost(pattern, req.TLS != nil)
if glob.Glob(normpat, host) {
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I'm not sure why you used the glob matcher here in the first place, can a host contain wildcards ?

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Good question. I'll check.

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Yes, you can have a route for *.example.com/foo

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I wrote a small benchmark to verify performance. gobwas is fast but only when the expression is pre-compiled. It is only 1.4 ms but this sits in the hot-path. However, there is no easy way to refactor this since Table is just a map[string]Routes. Might be a good time to finally change this to a struct. I'll have a look.

$ go test -bench .
goos: darwin
goarch: amd64
pkg: globbench
BenchmarkGlob/ryanuber-8         	20000000	        91.4 ns/op
BenchmarkGlob/gobwas-8           	 1000000	      1385 ns/op
BenchmarkGlob/gobwas-precompile-8         	200000000	         7.29 ns/op
PASS
ok  	globbench	5.537s

package main

import "testing"
import ryanuber "github.com/ryanuber/go-glob"
import gobwas "github.com/gobwas/glob"

var n int

func BenchmarkGlob(b *testing.B) {
	b.Run("ryanuber", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			if ryanuber.Glob("*.example.com", "foo.example.com") {
				n++
			}
		}
	})
	b.Run("gobwas", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			m := gobwas.MustCompile("*.example.com")
			if m.Match("foo.example.com") {
				n++
			}
		}
	})
	b.Run("gobwas-precompile", func(b *testing.B) {
		m := gobwas.MustCompile("*.example.com")
		for i := 0; i < b.N; i++ {
			if m.Match("foo.example.com") {
				n++
			}
		}
	})
	b.Log(n)
}

g := glob.MustCompile(normpat)
if g.Match(host) {
hosts = append(hosts, pattern)
}
}
Expand Down
4 changes: 2 additions & 2 deletions vendor/github.com/ryanuber/go-glob/LICENSE → vendor/github.com/gobwas/glob/LICENSE
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26 changes: 26 additions & 0 deletions vendor/github.com/gobwas/glob/bench.sh
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