ext: lock all drivers

ext/notification/driver.go

@@ -21,6 +21,8 @@
 package notification
 
 import (
+	"sync"
+
 	"github.com/coreos/pkg/capnslog"
 
 	"github.com/coreos/clair/config"
@@ -30,8 +32,8 @@ import (
 var (
 	log = capnslog.NewPackageLogger("github.com/coreos/clair", "ext/notification")
 
-	// Senders is the list of registered Senders.
-	Senders = make(map[string]Sender)
+	sendersM sync.RWMutex
+	senders  = make(map[string]Sender)
 )
 
 // Sender represents anything that can transmit notifications.
@@ -46,8 +48,8 @@ type Sender interface {
 
 // RegisterSender makes a Sender available by the provided name.
 //
-// If RegisterSender is called twice with the same name, the name is blank, or
-// if the provided Sender is nil, this function panics.
+// If called twice with the same name, the name is blank, or if the provided
+// Sender is nil, this function panics.
 func RegisterSender(name string, s Sender) {
 	if name == "" {
 		panic("notification: could not register a Sender with an empty name")
@@ -57,9 +59,33 @@ func RegisterSender(name string, s Sender) {
 		panic("notification: could not register a nil Sender")
 	}
 
-	if _, dup := Senders[name]; dup {
+	sendersM.Lock()
+	defer sendersM.Unlock()
+
+	if _, dup := senders[name]; dup {
 		panic("notification: RegisterSender called twice for " + name)
 	}
 
-	Senders[name] = s
+	senders[name] = s
+}
+
+// Senders returns the list of the registered Senders.
+func Senders() map[string]Sender {
+	sendersM.RLock()
+	defer sendersM.RUnlock()
+
+	ret := make(map[string]Sender)
+	for k, v := range senders {
+		ret[k] = v
+	}
+
+	return ret
+}
+
+// UnregisterSender removes a Sender with a particular name from the list.
+func UnregisterSender(name string) {
+	sendersM.Lock()
+	defer sendersM.Unlock()
+
+	delete(senders, name)
 }

ext/versionfmt/driver.go

@@ -63,18 +63,20 @@ type Parser interface {
 // if the provided Parser is nil, this function panics.
 func RegisterParser(name string, p Parser) {
 	if name == "" {
-		panic("Could not register a Parser with an empty name")
+		panic("versionfmt: could not register a Parser with an empty name")
 	}
+
 	if p == nil {
-		panic("Could not register a nil Parser")
+		panic("versionfmt: could not register a nil Parser")
 	}
 
 	parsersM.Lock()
 	defer parsersM.Unlock()
 
-	if _, alreadyExists := parsers[name]; alreadyExists {
-		panic("Parser '" + name + "' is already registered")
+	if _, dup := parsers[name]; dup {
+		panic("versionfmt: RegisterParser called twice for " + name)
 	}
+
 	parsers[name] = p
 }
 

ext/vulnmdsrc/driver.go

@@ -17,12 +17,16 @@
 package vulnmdsrc
 
 import (
+	"sync"
+
 	"github.com/coreos/clair/database"
 	"github.com/coreos/clair/utils/types"
 )
 
-// Appenders is the list of registered Appenders.
-var Appenders = make(map[string]Appender)
+var (
+	appendersM sync.RWMutex
+	appenders  = make(map[string]Appender)
+)
 
 // AppendFunc is the type of a callback provided to an Appender.
 type AppendFunc func(metadataKey string, metadata interface{}, severity types.Priority)
@@ -49,20 +53,37 @@ type Appender interface {
 }
 
 // RegisterAppender makes an Appender available by the provided name.
-// If Register is called twice with the same name or if driver is nil,
-// it panics.
+//
+// If called twice with the same name, the name is blank, or if the provided
+// Appender is nil, this function panics.
 func RegisterAppender(name string, a Appender) {
 	if name == "" {
-		panic("updater: could not register an Appender with an empty name")
+		panic("vulnmdsrc: could not register an Appender with an empty name")
 	}
 
 	if a == nil {
 		panic("vulnmdsrc: could not register a nil Appender")
 	}
 
-	if _, dup := Appenders[name]; dup {
+	appendersM.Lock()
+	defer appendersM.Unlock()
+
+	if _, dup := appenders[name]; dup {
 		panic("vulnmdsrc: RegisterAppender called twice for " + name)
 	}
 
-	Appenders[name] = a
+	appenders[name] = a
+}
+
+// Appenders returns the list of the registered Appenders.
+func Appenders() map[string]Appender {
+	appendersM.RLock()
+	defer appendersM.RUnlock()
+
+	ret := make(map[string]Appender)
+	for k, v := range appenders {
+		ret[k] = v
+	}
+
+	return ret
 }

ext/vulnsrc/driver.go

@@ -18,21 +18,30 @@ package vulnsrc
 
 import (
 	"errors"
+	"sync"
 
 	"github.com/coreos/clair/database"
 )
 
 var (
-	// Updaters is the list of registered Updaters.
-	Updaters = make(map[string]Updater)
-
 	// ErrFilesystem is returned when a fetcher fails to interact with the local filesystem.
 	ErrFilesystem = errors.New("vulnsrc: something went wrong when interacting with the fs")
 
 	// ErrGitFailure is returned when a fetcher fails to interact with git.
 	ErrGitFailure = errors.New("vulnsrc: something went wrong when interacting with git")
+
+	updatersM sync.RWMutex
+	updaters  = make(map[string]Updater)
 )
 
+// UpdateResponse represents the sum of results of an update.
+type UpdateResponse struct {
+	FlagName        string
+	FlagValue       string
+	Notes           []string
+	Vulnerabilities []database.Vulnerability
+}
+
 // Updater represents anything that can fetch vulnerabilities and insert them
 // into a Clair datastore.
 type Updater interface {
@@ -44,18 +53,10 @@ type Updater interface {
 	Clean()
 }
 
-// UpdateResponse represents the sum of results of an update.
-type UpdateResponse struct {
-	FlagName        string
-	FlagValue       string
-	Notes           []string
-	Vulnerabilities []database.Vulnerability
-}
-
 // RegisterUpdater makes an Updater available by the provided name.
 //
-// If RegisterUpdater is called twice with the same name, the name is blank, or
-// if the provided Updater is nil, this function panics.
+// If called twice with the same name, the name is blank, or if the provided
+// Updater is nil, this function panics.
 func RegisterUpdater(name string, u Updater) {
 	if name == "" {
 		panic("vulnsrc: could not register an Updater with an empty name")
@@ -65,9 +66,25 @@ func RegisterUpdater(name string, u Updater) {
 		panic("vulnsrc: could not register a nil Updater")
 	}
 
-	if _, dup := Updaters[name]; dup {
+	updatersM.Lock()
+	defer updatersM.Unlock()
+
+	if _, dup := updaters[name]; dup {
 		panic("vulnsrc: RegisterUpdater called twice for " + name)
 	}
 
-	Updaters[name] = u
+	updaters[name] = u
+}
+
+// Updaters returns the list of the registered Updaters.
+func Updaters() map[string]Updater {
+	updatersM.RLock()
+	defer updatersM.RUnlock()
+
+	ret := make(map[string]Updater)
+	for k, v := range updaters {
+		ret[k] = v
+	}
+
+	return ret
 }

notifier/notifier.go

@@ -63,19 +63,19 @@ func Run(config *config.NotifierConfig, datastore database.Datastore, stopper *u
 	defer stopper.End()
 
 	// Configure registered notifiers.
-	for senderName, sender := range notification.Senders {
+	for senderName, sender := range notification.Senders() {
 		if configured, err := sender.Configure(config); configured {
 			log.Infof("sender '%s' configured\n", senderName)
 		} else {
-			delete(notification.Senders, senderName)
+			notification.UnregisterSender(senderName)
 			if err != nil {
 				log.Errorf("could not configure notifier '%s': %s", senderName, err)
 			}
 		}
 	}
 
 	// Do not run the updater if there is no notifier enabled.
-	if len(notification.Senders) == 0 {
+	if len(notification.Senders()) == 0 {
 		log.Infof("notifier service is disabled")
 		return
 	}
@@ -149,7 +149,7 @@ func findTask(datastore database.Datastore, renotifyInterval time.Duration, whoA
 
 func handleTask(n database.VulnerabilityNotification, st *utils.Stopper, maxAttempts int) (bool, bool) {
 	// Send notification.
-	for senderName, sender := range notification.Senders {
+	for senderName, sender := range notification.Senders() {
 		var attempts int
 		var backOff time.Duration
 		for {

updater/updater.go

@@ -152,10 +152,10 @@ func Run(config *config.UpdaterConfig, datastore database.Datastore, st *utils.S
 	}
 
 	// Clean resources.
-	for _, appenders := range vulnmdsrc.Appenders {
+	for _, appenders := range vulnmdsrc.Appenders() {
 		appenders.Clean()
 	}
-	for _, updaters := range vulnsrc.Updaters {
+	for _, updaters := range vulnsrc.Updaters() {
 		updaters.Clean()
 	}
 
@@ -215,7 +215,7 @@ func fetch(datastore database.Datastore) (bool, []database.Vulnerability, map[st
 	// Fetch updates in parallel.
 	log.Info("fetching vulnerability updates")
 	var responseC = make(chan *vulnsrc.UpdateResponse, 0)
-	for n, u := range vulnsrc.Updaters {
+	for n, u := range vulnsrc.Updaters() {
 		go func(name string, u vulnsrc.Updater) {
 			response, err := u.Update(datastore)
 			if err != nil {
@@ -231,7 +231,7 @@ func fetch(datastore database.Datastore) (bool, []database.Vulnerability, map[st
 	}
 
 	// Collect results of updates.
-	for i := 0; i < len(vulnsrc.Updaters); i++ {
+	for i := 0; i < len(vulnsrc.Updaters()); i++ {
 		resp := <-responseC
 		if resp != nil {
 			vulnerabilities = append(vulnerabilities, doVulnerabilitiesNamespacing(resp.Vulnerabilities)...)
@@ -248,7 +248,7 @@ func fetch(datastore database.Datastore) (bool, []database.Vulnerability, map[st
 
 // Add metadata to the specified vulnerabilities using the registered MetadataFetchers, in parallel.
 func addMetadata(datastore database.Datastore, vulnerabilities []database.Vulnerability) []database.Vulnerability {
-	if len(vulnmdsrc.Appenders) == 0 {
+	if len(vulnmdsrc.Appenders()) == 0 {
 		return vulnerabilities
 	}
 
@@ -264,9 +264,9 @@ func addMetadata(datastore database.Datastore, vulnerabilities []database.Vulner
 	}
 
 	var wg sync.WaitGroup
-	wg.Add(len(vulnmdsrc.Appenders))
+	wg.Add(len(vulnmdsrc.Appenders()))
 
-	for n, a := range vulnmdsrc.Appenders {
+	for n, a := range vulnmdsrc.Appenders() {
 		go func(name string, appender vulnmdsrc.Appender) {
 			defer wg.Done()