add debug server to activitylog & check web availability

Signed-off-by: Christian Richter <crichter@owncloud.com>

services/activitylog/pkg/command/server.go

@@ -13,9 +13,7 @@ import (
 	microstore "go-micro.dev/v4/store"
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/config/configlog"
-	"github.com/owncloud/ocis/v2/ocis-pkg/handlers"
 	"github.com/owncloud/ocis/v2/ocis-pkg/registry"
-	"github.com/owncloud/ocis/v2/ocis-pkg/service/debug"
 	ogrpc "github.com/owncloud/ocis/v2/ocis-pkg/service/grpc"
 	"github.com/owncloud/ocis/v2/ocis-pkg/tracing"
 	"github.com/owncloud/ocis/v2/ocis-pkg/version"
@@ -25,6 +23,7 @@ import (
 	"github.com/owncloud/ocis/v2/services/activitylog/pkg/config/parser"
 	"github.com/owncloud/ocis/v2/services/activitylog/pkg/logging"
 	"github.com/owncloud/ocis/v2/services/activitylog/pkg/metrics"
+	"github.com/owncloud/ocis/v2/services/activitylog/pkg/server/debug"
 	"github.com/owncloud/ocis/v2/services/activitylog/pkg/server/http"
 )
 
@@ -146,25 +145,19 @@ func Server(cfg *config.Config) *cli.Command {
 			}
 
 			{
-				checkHandler := handlers.NewCheckHandler(
-					handlers.NewCheckHandlerConfiguration().
-						WithLogger(logger),
-				)
-
-				server := debug.NewService(
+				debugServer, err := debug.Server(
 					debug.Logger(logger),
-					debug.Name(cfg.Service.Name),
-					debug.Version(version.GetString()),
-					debug.Address(cfg.Debug.Addr),
-					debug.Token(cfg.Debug.Token),
-					debug.Pprof(cfg.Debug.Pprof),
-					debug.Zpages(cfg.Debug.Zpages),
-					debug.Health(checkHandler),
-					debug.Ready(checkHandler),
+					debug.Context(ctx),
+					debug.Config(cfg),
 				)
 
-				gr.Add(server.ListenAndServe, func(_ error) {
-					_ = server.Shutdown(ctx)
+				if err != nil {
+					logger.Info().Err(err).Str("server", "debug").Msg("Failed to initialize server")
+					return err
+				}
+
+				gr.Add(debugServer.ListenAndServe, func(_ error) {
+					_ = debugServer.Shutdown(ctx)
 					cancel()
 				})
 			}

services/activitylog/pkg/server/debug/option.go

@@ -0,0 +1,50 @@
+package debug
+
+import (
+	"context"
+
+	"github.com/owncloud/ocis/v2/ocis-pkg/log"
+	"github.com/owncloud/ocis/v2/services/activitylog/pkg/config"
+)
+
+// Option defines a single option function.
+type Option func(o *Options)
+
+// Options defines the available options for this package.
+type Options struct {
+	Logger  log.Logger
+	Context context.Context
+	Config  *config.Config
+}
+
+// newOptions initializes the available default options.
+func newOptions(opts ...Option) Options {
+	opt := Options{}
+
+	for _, o := range opts {
+		o(&opt)
+	}
+
+	return opt
+}
+
+// Logger provides a function to set the logger option.
+func Logger(val log.Logger) Option {
+	return func(o *Options) {
+		o.Logger = val
+	}
+}
+
+// Context provides a function to set the context option.
+func Context(val context.Context) Option {
+	return func(o *Options) {
+		o.Context = val
+	}
+}
+
+// Config provides a function to set the config option.
+func Config(val *config.Config) Option {
+	return func(o *Options) {
+		o.Config = val
+	}
+}

services/activitylog/pkg/server/debug/server.go

@@ -0,0 +1,40 @@
+package debug
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/cs3org/reva/v2/pkg/events/stream"
+	"github.com/owncloud/ocis/v2/ocis-pkg/handlers"
+	"github.com/owncloud/ocis/v2/ocis-pkg/service/debug"
+	"github.com/owncloud/ocis/v2/ocis-pkg/version"
+)
+
+// Server initializes the debug service and server.
+func Server(opts ...Option) (*http.Server, error) {
+	options := newOptions(opts...)
+
+	checkHandler := handlers.NewCheckHandler(
+		handlers.NewCheckHandlerConfiguration().
+			WithLogger(options.Logger).WithCheck("nats reachability", func(ctx context.Context) error {
+			_, err := stream.NatsFromConfig("healthcheckfornats", false, stream.NatsConfig(options.Config.Events))
+			if err != nil {
+				return fmt.Errorf("could not connect to nats server: %v", err)
+			}
+			return nil
+		}),
+	)
+
+	return debug.NewService(
+		debug.Logger(options.Logger),
+		debug.Name(options.Config.Service.Name),
+		debug.Version(version.GetString()),
+		debug.Address(options.Config.Debug.Addr),
+		debug.Token(options.Config.Debug.Token),
+		debug.Pprof(options.Config.Debug.Pprof),
+		debug.Zpages(options.Config.Debug.Zpages),
+		debug.Health(checkHandler),
+		debug.Ready(checkHandler),
+	), nil
+}

services/web/pkg/server/debug/server.go

@@ -1,6 +1,9 @@
 package debug
 
 import (
+	"context"
+	"fmt"
+	"net"
 	"net/http"
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/handlers"
@@ -14,7 +17,20 @@ func Server(opts ...Option) (*http.Server, error) {
 
 	checkHandler := handlers.NewCheckHandler(
 		handlers.NewCheckHandlerConfiguration().
-			WithLogger(options.Logger),
+			WithLogger(options.Logger).WithCheck("web reachability", func(ctx context.Context) error {
+			conn, err := net.Dial("tcp", options.Config.HTTP.Addr)
+			defer func(conn net.Conn) {
+				err := conn.Close()
+				if err != nil {
+					return
+				}
+			}(conn)
+			if err != nil {
+				return fmt.Errorf("could not connect to web server: %v", err)
+			}
+
+			return nil
+		}),
 	)
 
 	return debug.NewService(