plugin/grpc: New gRPC plugin (#2667)

* plugin/grpc: New gRPC plugin

* some changes after the first review:

- remove healthcheck. gRPC already has this implicitly implemented
- some naming and stetic changes
- fix some comments
- other minor fixes

* plugin/grpc: New gRPC plugin

* some changes after the first review:

- remove healthcheck. gRPC already has this implicitly implemented
- some naming and stetic changes
- fix some comments
- other minor fixes

* add OWNERS file and change plugin order

* remove Rcode checker

1 files changed, 156 insertions, 0 deletions

diff --git a/plugin/grpc/setup_test.go b/plugin/grpc/setup_test.go
new file mode 100644
index 000000000..fb470a541
--- /dev/null
+++ b/plugin/grpc/setup_test.go
@@ -0,0 +1,156 @@
+package grpc
+
+import (
+	"io/ioutil"
+	"os"
+	"reflect"
+	"strings"
+	"testing"
+
+	"github.com/mholt/caddy"
+)
+
+func TestSetup(t *testing.T) {
+	tests := []struct {
+		input           string
+		shouldErr       bool
+		expectedFrom    string
+		expectedIgnored []string
+		expectedErr     string
+	}{
+		// positive
+		{"grpc . 127.0.0.1", false, ".", nil, ""},
+		{"grpc . 127.0.0.1 {\nexcept miek.nl\n}\n", false, ".", nil, ""},
+		{"grpc . 127.0.0.1", false, ".", nil, ""},
+		{"grpc . 127.0.0.1:53", false, ".", nil, ""},
+		{"grpc . 127.0.0.1:8080", false, ".", nil, ""},
+		{"grpc . [::1]:53", false, ".", nil, ""},
+		{"grpc . [2003::1]:53", false, ".", nil, ""},
+		// negative
+		{"grpc . a27.0.0.1", true, "", nil, "not an IP"},
+		{"grpc . 127.0.0.1 {\nblaatl\n}\n", true, "", nil, "unknown property"},
+		{`grpc . ::1
+		grpc com ::2`, true, "", nil, "plugin"},
+	}
+
+	for i, test := range tests {
+		c := caddy.NewTestController("grpc", test.input)
+		g, err := parseGRPC(c)
+
+		if test.shouldErr && err == nil {
+			t.Errorf("Test %d: expected error but found %s for input %s", i, err, test.input)
+		}
+
+		if err != nil {
+			if !test.shouldErr {
+				t.Errorf("Test %d: expected no error but found one for input %s, got: %v", i, test.input, err)
+			}
+
+			if !strings.Contains(err.Error(), test.expectedErr) {
+				t.Errorf("Test %d: expected error to contain: %v, found error: %v, input: %s", i, test.expectedErr, err, test.input)
+			}
+		}
+
+		if !test.shouldErr && g.from != test.expectedFrom {
+			t.Errorf("Test %d: expected: %s, got: %s", i, test.expectedFrom, g.from)
+		}
+		if !test.shouldErr && test.expectedIgnored != nil {
+			if !reflect.DeepEqual(g.ignored, test.expectedIgnored) {
+				t.Errorf("Test %d: expected: %q, actual: %q", i, test.expectedIgnored, g.ignored)
+			}
+		}
+	}
+}
+
+func TestSetupTLS(t *testing.T) {
+	tests := []struct {
+		input              string
+		shouldErr          bool
+		expectedServerName string
+		expectedErr        string
+	}{
+		// positive
+		{`grpc . 127.0.0.1 {
+tls_servername dns
+}`, false, "dns", ""},
+		{`grpc . 127.0.0.1 {
+tls_servername dns
+}`, false, "", ""},
+		{`grpc . 127.0.0.1 {
+tls
+}`, false, "", ""},
+		{`grpc . 127.0.0.1`, false, "", ""},
+	}
+
+	for i, test := range tests {
+		c := caddy.NewTestController("dns", test.input)
+		g, err := parseGRPC(c)
+
+		if test.shouldErr && err == nil {
+			t.Errorf("Test %d: expected error but found %s for input %s", i, err, test.input)
+		}
+
+		if err != nil {
+			if !test.shouldErr {
+				t.Errorf("Test %d: expected no error but found one for input %s, got: %v", i, test.input, err)
+			}
+
+			if !strings.Contains(err.Error(), test.expectedErr) {
+				t.Errorf("Test %d: expected error to contain: %v, found error: %v, input: %s", i, test.expectedErr, err, test.input)
+			}
+		}
+
+		if !test.shouldErr && test.expectedServerName != "" && g.tlsConfig != nil && test.expectedServerName != g.tlsConfig.ServerName {
+			t.Errorf("Test %d: expected: %q, actual: %q", i, test.expectedServerName, g.tlsConfig.ServerName)
+		}
+	}
+}
+
+func TestSetupResolvconf(t *testing.T) {
+	const resolv = "resolv.conf"
+	if err := ioutil.WriteFile(resolv,
+		[]byte(`nameserver 10.10.255.252
+nameserver 10.10.255.253`), 0666); err != nil {
+		t.Fatalf("Failed to write resolv.conf file: %s", err)
+	}
+	defer os.Remove(resolv)
+
+	tests := []struct {
+		input         string
+		shouldErr     bool
+		expectedErr   string
+		expectedNames []string
+	}{
+		// pass
+		{`grpc . ` + resolv, false, "", []string{"10.10.255.252:53", "10.10.255.253:53"}},
+	}
+
+	for i, test := range tests {
+		c := caddy.NewTestController("grpc", test.input)
+		f, err := parseGRPC(c)
+
+		if test.shouldErr && err == nil {
+			t.Errorf("Test %d: expected error but found %s for input %s", i, err, test.input)
+			continue
+		}
+
+		if err != nil {
+			if !test.shouldErr {
+				t.Errorf("Test %d: expected no error but found one for input %s, got: %v", i, test.input, err)
+			}
+
+			if !strings.Contains(err.Error(), test.expectedErr) {
+				t.Errorf("Test %d: expected error to contain: %v, found error: %v, input: %s", i, test.expectedErr, err, test.input)
+			}
+		}
+
+		if !test.shouldErr {
+			for j, n := range test.expectedNames {
+				addr := f.proxies[j].addr
+				if n != addr {
+					t.Errorf("Test %d, expected %q, got %q", j, n, addr)
+				}
+			}
+		}
+	}
+}