diff --git a/README.md b/README.md index 4035f62..8f63e93 100644 --- a/README.md +++ b/README.md @@ -1,21 +1,22 @@ # kuberesolver -Grpc Client-Side Load Balancer with Kubernetes name resolver + +A Grpc name resolver by using kubernetes API. +It comes with a small ~250 LOC kubernetes client to find service endpoints. Therefore it won't bloat your binaries. ```go -// Register kuberesolver to grpc +// Register kuberesolver to grpc before calling grpc.Dial kuberesolver.RegisterInCluster() + // is same as -resolver.Register(kuberesolver.NewBuilder(nil)) -// you can bring your own k8s client, below is default behaviour -client, err := kuberesolver.NewInClusterK8sClient() -resolver.Register(kuberesolver.NewBuilder(client)) +resolver.Register(kuberesolver.NewBuilder(nil /*custom kubernetes client*/ , "kubernetes")) // USAGE: // if schema is 'kubernetes' then grpc will use kuberesolver to resolve addresses -cc, err := grpc.Dial("kubernetes:///service-name.namespace:portname", opts...) +cc, err := grpc.Dial("kubernetes:///service.namespace:portname", opts...) ``` An url can be one of the following, [grpc naming docs](https://github.com/grpc/grpc/blob/master/doc/naming.md) + ``` kubernetes:///service-name:8080 kubernetes:///service-name:portname @@ -26,3 +27,27 @@ kubernetes://service-name:8080/ kubernetes://service-name.namespace:8080/ ``` + +### Using alternative Schema + +Use `RegisterInClusterWithSchema(schema)` instead of `RegisterInCluster` on start. + +### Client Side Load Balancing + +You need to pass grpc.WithBalancerName option to grpc on dial: + +```go +grpc.DialContext(ctx, "kubernetes:///service:grpc", grpc.WithBalancerName("round_robin") ) +``` +This will create subconnections for each available service endpoints. + +### How is this different from dialing to `service.namespace:8080` + +Connecting to a service by dialing to `service.namespace:8080` uses DNS and it returns service stable IP. Therefore, gRPC doesn't know the endpoint IP addresses and it fails to reconnect to target services in case of failure. + +Kuberesolver uses kubernetes API to get and watch service endpoint IP addresses. +Since it provides and updates all available service endpoints, together with a client-side balancer you can achive zero downtime deployments. + +### RBAC + +You need give `GET` and `WATCH` access to the `endpoints` if you are using RBAC in your cluster. diff --git a/builder.go b/builder.go index aaa84a6..f0c0fe9 100644 --- a/builder.go +++ b/builder.go @@ -1,6 +1,7 @@ package kuberesolver import ( + "context" "fmt" "io" "net" @@ -11,7 +12,6 @@ import ( "github.com/prometheus/client_golang/prometheus" "github.com/prometheus/client_golang/prometheus/promauto" - "golang.org/x/net/context" "google.golang.org/grpc/grpclog" "google.golang.org/grpc/resolver" ) @@ -47,19 +47,20 @@ type targetInfo struct { } func (ti targetInfo) String() string { - return fmt.Sprintf("kubernetes:///%s/%s:%s", ti.serviceNamespace, ti.serviceName, ti.port) + return fmt.Sprintf("kubernetes://%s/%s:%s", ti.serviceNamespace, ti.serviceName, ti.port) } -// RegisterInCluster registers the kuberesolver builder to grpc +// RegisterInCluster registers the kuberesolver builder to grpc with kubernetes schema func RegisterInCluster() { RegisterInClusterWithSchema(kubernetesSchema) } +// RegisterInClusterWithSchema registers the kuberesolver builder to the grpc with custom schema func RegisterInClusterWithSchema(schema string) { resolver.Register(NewBuilder(nil, schema)) } -// NewBuilder creates a kubeBuilder which is used to factory Kuberesolvers. +// NewBuilder creates a kubeBuilder which is used by grpc resolver. func NewBuilder(client K8sClient, schema string) resolver.Builder { return &kubeBuilder{ k8sClient: client, @@ -79,14 +80,8 @@ func parseResolverTarget(target resolver.Target) (targetInfo, error) { // kubernetes://service.default:port/ if end == "" { end = target.Authority - snamespace = "default" + snamespace = "" } - // kubernetes:///service:port - // kubernetes://service:port/ - if snamespace == "" { - snamespace = "default" - } - ti := targetInfo{} if end == "" { return targetInfo{}, fmt.Errorf("target(%q) is empty", target) @@ -140,6 +135,9 @@ func (b *kubeBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts if err != nil { return nil, err } + if ti.serviceNamespace == "" { + ti.serviceNamespace = getCurrentNamespaceOrDefault() + } ctx, cancel := context.WithCancel(context.Background()) r := &kResolver{ target: ti, diff --git a/builder_test.go b/builder_test.go index 687b886..db20ca2 100644 --- a/builder_test.go +++ b/builder_test.go @@ -2,12 +2,12 @@ package kuberesolver import ( "fmt" - "google.golang.org/grpc/serviceconfig" "log" "strings" "testing" "google.golang.org/grpc/resolver" + "google.golang.org/grpc/serviceconfig" ) func newTestBuilder() resolver.Builder { @@ -68,9 +68,10 @@ func TestBuilder(t *testing.T) { } -// +// copied from grpc package to test parsing endpoints + // split2 returns the values from strings.SplitN(s, sep, 2). -// If sep is not found, it returns ("", s, false) instead. +// If sep is not found, it returns ("", "", false) instead. func split2(s, sep string) (string, string, bool) { spl := strings.SplitN(s, sep, 2) if len(spl) < 2 { @@ -79,29 +80,33 @@ func split2(s, sep string) (string, string, bool) { return spl[0], spl[1], true } -// copied from grpc package to test parsing endpoints +// ParseTarget splits target into a resolver.Target struct containing scheme, +// authority and endpoint. // -// parseTarget splits target into a struct containing scheme, authority and -// endpoint. +// If target is not a valid scheme://authority/endpoint, it returns {Endpoint: +// target}. func parseTarget(target string) (ret resolver.Target) { var ok bool ret.Scheme, ret.Endpoint, ok = split2(target, "://") if !ok { return resolver.Target{Endpoint: target} } - ret.Authority, ret.Endpoint, _ = split2(ret.Endpoint, "/") + ret.Authority, ret.Endpoint, ok = split2(ret.Endpoint, "/") + if !ok { + return resolver.Target{Endpoint: target} + } return ret } func TestParseResolverTarget(t *testing.T) { - for _, test := range []struct { + for i, test := range []struct { target resolver.Target want targetInfo err bool }{ {resolver.Target{"", "", ""}, targetInfo{"", "", "", false, false}, true}, - {resolver.Target{"", "a", ""}, targetInfo{"a", "default", "", false, true}, false}, - {resolver.Target{"", "", "a"}, targetInfo{"a", "default", "", false, true}, false}, + {resolver.Target{"", "a", ""}, targetInfo{"a", "", "", false, true}, false}, + {resolver.Target{"", "", "a"}, targetInfo{"a", "", "", false, true}, false}, {resolver.Target{"", "a", "b"}, targetInfo{"b", "a", "", false, true}, false}, {resolver.Target{"", "a.b", ""}, targetInfo{"a", "b", "", false, true}, false}, {resolver.Target{"", "", "a.b"}, targetInfo{"a", "b", "", false, true}, false}, @@ -113,21 +118,21 @@ func TestParseResolverTarget(t *testing.T) { } { got, err := parseResolverTarget(test.target) if err == nil && test.err { - t.Errorf("want error but got nil") + t.Errorf("case %d: want error but got nil", i) continue } if err != nil && !test.err { - t.Errorf("got '%v' error but don't want an error", err) + t.Errorf("case %d: got '%v' error but don't want an error", i, err) continue } if got != test.want { - t.Errorf("parseTarget(%q) = %+v, want %+v", test.target, got, test.want) + t.Errorf("case %d parseTarget(%q) = %+v, want %+v", i, test.target, got, test.want) } } } func TestParseTargets(t *testing.T) { - for _, test := range []struct { + for i, test := range []struct { target string want targetInfo err bool @@ -135,28 +140,28 @@ func TestParseTargets(t *testing.T) { {"", targetInfo{}, true}, {"kubernetes:///", targetInfo{}, true}, {"kubernetes://a:30", targetInfo{}, true}, - {"kubernetes://a/", targetInfo{"a", "default", "", false, true}, false}, - {"kubernetes:///a", targetInfo{"a", "default", "", false, true}, false}, + {"kubernetes://a/", targetInfo{"a", "", "", false, true}, false}, + {"kubernetes:///a", targetInfo{"a", "", "", false, true}, false}, {"kubernetes://a/b", targetInfo{"b", "a", "", false, true}, false}, {"kubernetes://a.b/", targetInfo{"a", "b", "", false, true}, false}, {"kubernetes:///a.b:80", targetInfo{"a", "b", "80", false, false}, false}, {"kubernetes:///a.b:port", targetInfo{"a", "b", "port", true, false}, false}, - {"kubernetes:///a:port", targetInfo{"a", "default", "port", true, false}, false}, + {"kubernetes:///a:port", targetInfo{"a", "", "port", true, false}, false}, {"kubernetes://x/a:port", targetInfo{"a", "x", "port", true, false}, false}, {"kubernetes://a.x:port/", targetInfo{"a", "x", "port", true, false}, false}, {"kubernetes://a.x:30/", targetInfo{"a", "x", "30", false, false}, false}, } { got, err := parseResolverTarget(parseTarget(test.target)) if err == nil && test.err { - t.Errorf("want error but got nil") + t.Errorf("case %d: want error but got nil", i) continue } if err != nil && !test.err { - t.Errorf("got '%v' error but don't want an error", err) + t.Errorf("case %d:got '%v' error but don't want an error", i, err) continue } if got != test.want { - t.Errorf("parseTarget(%q) = %+v, want %+v", test.target, got, test.want) + t.Errorf("case %d: parseTarget(%q) = %+v, want %+v", i, test.target, got, test.want) } } } diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..6d3a73c --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +module github.com/sercand/kuberesolver/v3 + +go 1.14 + +require ( + github.com/prometheus/client_golang v1.7.1 + google.golang.org/grpc v1.31.0 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..39d8fec --- /dev/null +++ b/go.sum @@ -0,0 +1,131 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod 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+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/kubernetes.go b/kubernetes.go index 18925ea..278331e 100644 --- a/kubernetes.go +++ b/kubernetes.go @@ -15,8 +15,10 @@ import ( ) const ( - serviceAccountToken = "/var/run/secrets/kubernetes.io/serviceaccount/token" - serviceAccountCACert = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt" + serviceAccountToken = "/var/run/secrets/kubernetes.io/serviceaccount/token" + serviceAccountCACert = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt" + kubernetesNamespaceFile = "/var/run/secrets/kubernetes.io/serviceaccount/namespace" + defaultNamespace = "default" ) // K8sClient is minimal kubernetes client interface @@ -135,3 +137,11 @@ func watchEndpoints(client K8sClient, namespace, targetName string) (watchInterf } return newStreamWatcher(resp.Body), nil } + +func getCurrentNamespaceOrDefault() string { + ns, err := ioutil.ReadFile(kubernetesNamespaceFile) + if err != nil { + return defaultNamespace + } + return string(ns) +}