Performance improvements and introduction of VendorID + ProductID

README.md

@@ -1,9 +1,7 @@
 # libudev
 Golang native implementation Udev library
 
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 [![GoDoc](https://godoc.org/github.com/qubesome/libudev?status.svg)](https://godoc.org/github.com/qubesome/libudev)
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 Installation

matcher/matcher.go

@@ -1,11 +1,9 @@
-/*
-Package matcher implements a service for filtering devices.
-
-Matcher allows you to add multiple filter rules by using the method `AddRule`
-and effectively filter the list of devices in a single pass.
-
-By default, Matcher uses the `AND` comparison strategy, but you can set the filtering strategy to` OR`.
-*/
+// Package matcher implements a mechanism for filtering devices.
+//
+// Matcher allows you to add multiple filter rules by using the method `AddRule`
+// and effectively filter the list of devices in a single pass.
+//
+// By default, Matcher uses the `AND` comparison strategy, but you can set the filtering strategy to` OR`.
 package matcher
 
 import (
@@ -50,7 +48,17 @@ func (m *Matcher) AddRule(rule Rule) {
 	m.rules = append(m.rules, rule)
 }
 
-func (m *Matcher) Match(devices []*types.Device) []*types.Device {
+func (m *Matcher) Match(devices ...*types.Device) bool {
+	for _, v := range devices {
+		if m.matchDevice(v) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (m *Matcher) Matches(devices []*types.Device) []*types.Device {
 	var ret []*types.Device
 	for _, v := range devices {
 		if !m.matchDevice(v) {

matcher/matcher_test.go

@@ -44,19 +44,19 @@ func TestMatchDefault(t *testing.T) {
 	m := NewMatcher()
 	m.AddRule(NewRuleDevpath("devpaht-1"))
 	m.AddRule(NewRuleDevpath("devpaht-2"))
-	if len(m.Match(devices)) != 0 {
+	if len(m.Matches(devices)) != 0 {
 		t.Fatal("Devices was found incorrectly")
 	}
 
 	m2 := NewMatcher()
 	m2.AddRule(NewRuleDevpath("devpaht-.+"))
 	m2.AddRule(NewRuleDevpath("devpaht-[0-9]+"))
-	if len(m2.Match(devices)) != 2 {
+	if len(m2.Matches(devices)) != 2 {
 		t.Fatal("Not found two devices")
 	}
 
 	m3 := NewMatcher()
-	if len(m3.Match(devices)) != 0 {
+	if len(m3.Matches(devices)) != 0 {
 		t.Fatal("Empty rules Matcher finded not 0 devices")
 	}
 }
@@ -68,34 +68,34 @@ func TestMatchAnd(t *testing.T) {
 	m.SetStrategy(StrategyAnd)
 	m.AddRule(NewRuleDevpath("devpaht-1"))
 	m.AddRule(NewRuleDevpath("devpaht-2"))
-	if len(m.Match(devices)) != 0 {
+	if len(m.Matches(devices)) != 0 {
 		t.Fatal("Devices was found incorrectly")
 	}
 
 	m2 := NewMatcher()
 	m2.SetStrategy(StrategyAnd)
 	m2.AddRule(NewRuleDevpath("devpaht-.+"))
 	m2.AddRule(NewRuleDevpath("devpaht-[0-9]+"))
-	if len(m2.Match(devices)) != 2 {
+	if len(m2.Matches(devices)) != 2 {
 		t.Fatal("Not found two devices")
 	}
 
 	m2.AddRule(NewRuleEnv("ENV-1", "[a-z]+"))
 	m2.AddRule(NewRuleEnv("ENV-2", "[0-9]+"))
 	m2.AddRule(NewRuleAttr("ATTR-1", "[a-z]+"))
 	m2.AddRule(NewRuleAttr("ATTR-2", "[0-9]+"))
-	if len(m2.Match(devices)) != 2 {
+	if len(m2.Matches(devices)) != 2 {
 		t.Fatal("Not found two devices")
 	}
 
 	m2.AddRule(NewRuleAttr("ATTR-2", "123"))
-	if len(m.Match(devices)) != 0 {
+	if len(m.Matches(devices)) != 0 {
 		t.Fatal("Devices was found incorrectly")
 	}
 
 	m3 := NewMatcher()
 	m3.SetStrategy(StrategyAnd)
-	if len(m3.Match(devices)) != 0 {
+	if len(m3.Matches(devices)) != 0 {
 		t.Fatal("Empty rules Matcher finded not 0 devices")
 	}
 }
@@ -107,12 +107,12 @@ func TestMatchOr(t *testing.T) {
 	m.SetStrategy(StrategyOr)
 	m.AddRule(NewRuleDevpath("devpaht-1"))
 	m.AddRule(NewRuleDevpath("devpaht-3"))
-	if len(m.Match(devices)) != 1 {
+	if len(m.Matches(devices)) != 1 {
 		t.Fatal("Not found one device")
 	}
 
 	m.AddRule(NewRuleDevpath("devpaht-2"))
-	if len(m.Match(devices)) != 2 {
+	if len(m.Matches(devices)) != 2 {
 		t.Fatal("Not found two devices")
 	}
 
@@ -123,13 +123,13 @@ func TestMatchOr(t *testing.T) {
 	m2.AddRule(NewRuleEnv("ENV-2", "NOT_FOUND"))
 	m2.AddRule(NewRuleAttr("ATTR-1", "ghi456jkl"))
 	m2.AddRule(NewRuleAttr("ATTR-2", "NOT_FOUND"))
-	if len(m2.Match(devices)) != 2 {
+	if len(m2.Matches(devices)) != 2 {
 		t.Fatal("Not found two devices")
 	}
 
 	m3 := NewMatcher()
 	m3.SetStrategy(StrategyOr)
-	if len(m3.Match(devices)) != 0 {
+	if len(m3.Matches(devices)) != 0 {
 		t.Fatal("Empty rules Matcher finded not 0 devices")
 	}
 }

options.go

@@ -0,0 +1,58 @@
+package libudev
+
+import (
+	"os"
+	"regexp"
+
+	"github.com/qubesome/libudev/matcher"
+)
+
+type Option func(*scanner)
+
+type options struct {
+	matcher *matcher.Matcher
+
+	pathFilterPattern *regexp.Regexp
+
+	devicesRoot  *os.Root
+	udevDataRoot *os.Root
+}
+
+// WithPathFilterPattern sets a pattern to filter out device paths that
+// are irrelevant to the query. This speeds up the scanning process, as
+// the scanner won't deal with files (and devices) that do not match the
+// regex.
+//
+// For example, when querying USB devices, this could be used:
+// libudev.WithPathFilterPattern(regexp.MustCompile("(?i)^.*pci0000:00.*usb.*"))
+func WithPathFilterPattern(p *regexp.Regexp) Option {
+	return func(o *scanner) {
+		o.opts.pathFilterPattern = p
+	}
+}
+
+// WithMatcher sets a matcher to the scanner, so that only devices matching
+// the rules are returned.
+func WithMatcher(m *matcher.Matcher) Option {
+	return func(o *scanner) {
+		o.opts.matcher = m
+	}
+}
+
+// WithDevicesRoot provides a way to set a different os.Root to be used
+// as the Devices dir. When not provided, defaults to an os.Root pointing
+// to /sys/devices.
+func WithDevicesRoot(r *os.Root) Option {
+	return func(o *scanner) {
+		o.opts.devicesRoot = r
+	}
+}
+
+// WithUDevDataRoot provides a way to set a different os.Root to be used
+// as the udev data dir. When not provided, defaults to an os.Root pointing
+// to /run/udev/data.
+func WithUDevDataRoot(r *os.Root) Option {
+	return func(o *scanner) {
+		o.opts.udevDataRoot = r
+	}
+}