enhancement: add sse service skeleton

.drone.star

@@ -78,6 +78,7 @@ config = {
         "services/search",
         "services/settings",
         "services/sharing",
+        "services/sse",
         "services/storage-system",
         "services/storage-publiclink",
         "services/storage-shares",

.gitignore

@@ -49,6 +49,7 @@ protogen/buf.sha1.lock
 /third-party-licenses
 
 # misc
+/tmp
 go.work
 go.work.sum
 .env

Makefile

@@ -44,6 +44,7 @@ OCIS_MODULES = \
 	services/search \
 	services/settings \
 	services/sharing \
+	services/sse \
 	services/storage-system \
 	services/storage-publiclink \
 	services/storage-shares \

changelog/unreleased/enhancement-sse-messaging.md

@@ -0,0 +1,10 @@
+Enhancement: SSE for messaging
+
+So far, sse has only been used to exchange messages between the server and the client.
+In order to be able to send more content to the client, we have moved the endpoint to a separate service and are now also using it for other notifications like:
+
+* notify postprocessing state changes.
+* notify file locking and unlocking.
+* ... @toDo
+
+https://github.com/owncloud/ocis/pull/6992

docs/services/general-info/port-ranges.md

@@ -30,7 +30,7 @@ We also suggest to use the last port in your extensions' range as a debug/metric
 | 9120-9124  | [graph]({{< ref "../graph/_index.md" >}})                                              |
 | 9125-9129  | [policies]({{< ref "../policies/_index.md" >}})                                        |
 | 9130-9134  | [idp]({{< ref "../idp/_index.md" >}})                                                  |
-| 9135-9139  | FREE (formerly used by graph-explorer)                                                 |
+| 9135-9139  | [sse]({{< ref "../sse/_index.md" >}})                                                  |
 | 9140-9141  | [frontend]({{< ref "../frontend/_index.md" >}})                                        |
 | 9142-9143  | [gateway]({{< ref "../gateway/_index.md" >}})                                          |
 | 9144-9145  | [users]({{< ref "../users/_index.md" >}})                                              |

docs/services/sse/_index.md

@@ -0,0 +1,16 @@
+---
+title: SSE
+date: 2022-08-08T00:00:00+00:00
+weight: 20
+geekdocRepo: https://github.com/owncloud/ocis
+geekdocEditPath: edit/master/docs/services/sse
+geekdocFilePath: _index.md
+geekdocCollapseSection: true
+---
+
+## Abstract
+
+
+## Table of Contents
+
+{{< toc-tree >}}

docs/services/sse/configuration.md

@@ -0,0 +1,15 @@
+---
+title: Service Configuration
+date: 2018-08-08T00:00:00+00:00
+weight: 20
+geekdocRepo: https://github.com/owncloud/ocis
+geekdocEditPath: edit/master/docs/services/sse
+geekdocFilePath: configuration.md
+geekdocCollapseSection: true
+---
+
+## Example YAML Config
+
+{{< include file="services/_includes/app-provider-config-example.yaml"  language="yaml" >}}
+
+{{< include file="services/_includes/app-provider_configvars.md" >}}

ocis-pkg/config/config.go

@@ -27,6 +27,7 @@ import (
 	search "github.com/owncloud/ocis/v2/services/search/pkg/config"
 	settings "github.com/owncloud/ocis/v2/services/settings/pkg/config"
 	sharing "github.com/owncloud/ocis/v2/services/sharing/pkg/config"
+	sse "github.com/owncloud/ocis/v2/services/sse/pkg/config"
 	storagepublic "github.com/owncloud/ocis/v2/services/storage-publiclink/pkg/config"
 	storageshares "github.com/owncloud/ocis/v2/services/storage-shares/pkg/config"
 	storagesystem "github.com/owncloud/ocis/v2/services/storage-system/pkg/config"
@@ -99,6 +100,7 @@ type Config struct {
 	Proxy             *proxy.Config          `yaml:"proxy"`
 	Settings          *settings.Config       `yaml:"settings"`
 	Sharing           *sharing.Config        `yaml:"sharing"`
+	SSE               *sse.Config            `yaml:"sse"`
 	StorageSystem     *storagesystem.Config  `yaml:"storage_system"`
 	StoragePublicLink *storagepublic.Config  `yaml:"storage_public"`
 	StorageShares     *storageshares.Config  `yaml:"storage_shares"`

ocis-pkg/config/defaultconfig.go

@@ -26,6 +26,7 @@ import (
 	search "github.com/owncloud/ocis/v2/services/search/pkg/config/defaults"
 	settings "github.com/owncloud/ocis/v2/services/settings/pkg/config/defaults"
 	sharing "github.com/owncloud/ocis/v2/services/sharing/pkg/config/defaults"
+	sse "github.com/owncloud/ocis/v2/services/sse/pkg/config/defaults"
 	storagepublic "github.com/owncloud/ocis/v2/services/storage-publiclink/pkg/config/defaults"
 	storageshares "github.com/owncloud/ocis/v2/services/storage-shares/pkg/config/defaults"
 	storageSystem "github.com/owncloud/ocis/v2/services/storage-system/pkg/config/defaults"
@@ -72,6 +73,7 @@ func DefaultConfig() *Config {
 		Search:            search.FullDefaultConfig(),
 		Settings:          settings.DefaultConfig(),
 		Sharing:           sharing.DefaultConfig(),
+		SSE:               sse.DefaultConfig(),
 		StoragePublicLink: storagepublic.DefaultConfig(),
 		StorageShares:     storageshares.DefaultConfig(),
 		StorageSystem:     storageSystem.DefaultConfig(),

ocis/pkg/command/services.go

@@ -1,13 +1,13 @@
 package command
 
 import (
+	"github.com/urfave/cli/v2"
+
 	"github.com/owncloud/ocis/v2/ocis-pkg/config"
 	"github.com/owncloud/ocis/v2/ocis-pkg/config/configlog"
 	"github.com/owncloud/ocis/v2/ocis-pkg/config/parser"
 	"github.com/owncloud/ocis/v2/ocis/pkg/command/helper"
 	"github.com/owncloud/ocis/v2/ocis/pkg/register"
-	"github.com/urfave/cli/v2"
-
 	antivirus "github.com/owncloud/ocis/v2/services/antivirus/pkg/command"
 	appprovider "github.com/owncloud/ocis/v2/services/app-provider/pkg/command"
 	appregistry "github.com/owncloud/ocis/v2/services/app-registry/pkg/command"
@@ -33,6 +33,7 @@ import (
 	search "github.com/owncloud/ocis/v2/services/search/pkg/command"
 	settings "github.com/owncloud/ocis/v2/services/settings/pkg/command"
 	sharing "github.com/owncloud/ocis/v2/services/sharing/pkg/command"
+	sse "github.com/owncloud/ocis/v2/services/sse/pkg/command"
 	storagepubliclink "github.com/owncloud/ocis/v2/services/storage-publiclink/pkg/command"
 	storageshares "github.com/owncloud/ocis/v2/services/storage-shares/pkg/command"
 	storagesystem "github.com/owncloud/ocis/v2/services/storage-system/pkg/command"
@@ -172,6 +173,11 @@ var svccmds = []register.Command{
 			cfg.Sharing.Commons = cfg.Commons
 		})
 	},
+	func(cfg *config.Config) *cli.Command {
+		return ServiceCommand(cfg, cfg.SSE.Service.Name, sse.GetCommands(cfg.SSE), func(c *config.Config) {
+			cfg.SSE.Commons = cfg.Commons
+		})
+	},
 	func(cfg *config.Config) *cli.Command {
 		return ServiceCommand(cfg, cfg.StoragePublicLink.Service.Name, storagepubliclink.GetCommands(cfg.StoragePublicLink), func(c *config.Config) {
 			cfg.StoragePublicLink.Commons = cfg.Commons

ocis/pkg/runtime/service/service.go

@@ -15,6 +15,8 @@ import (
 
 	"github.com/mohae/deepcopy"
 	"github.com/olekukonko/tablewriter"
+	"github.com/thejerf/suture/v4"
+
 	ociscfg "github.com/owncloud/ocis/v2/ocis-pkg/config"
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 	"github.com/owncloud/ocis/v2/ocis-pkg/shared"
@@ -42,6 +44,7 @@ import (
 	search "github.com/owncloud/ocis/v2/services/search/pkg/command"
 	settings "github.com/owncloud/ocis/v2/services/settings/pkg/command"
 	sharing "github.com/owncloud/ocis/v2/services/sharing/pkg/command"
+	sse "github.com/owncloud/ocis/v2/services/sse/pkg/command"
 	storagepublic "github.com/owncloud/ocis/v2/services/storage-publiclink/pkg/command"
 	storageshares "github.com/owncloud/ocis/v2/services/storage-shares/pkg/command"
 	storageSystem "github.com/owncloud/ocis/v2/services/storage-system/pkg/command"
@@ -53,7 +56,6 @@ import (
 	web "github.com/owncloud/ocis/v2/services/web/pkg/command"
 	webdav "github.com/owncloud/ocis/v2/services/webdav/pkg/command"
 	webfinger "github.com/owncloud/ocis/v2/services/webfinger/pkg/command"
-	"github.com/thejerf/suture/v4"
 )
 
 var (
@@ -298,11 +300,16 @@ func NewService(options ...Option) (*Service, error) {
 		cfg.Sharing.Commons = cfg.Commons
 		return sharing.Execute(cfg.Sharing)
 	})
+	dreg(opts.Config.SSE.Service.Name, func(ctx context.Context, cfg *ociscfg.Config) error {
+		cfg.SSE.Context = ctx
+		cfg.SSE.Commons = cfg.Commons
+		return sse.Execute(cfg.SSE)
+	})
 
 	return s, nil
 }
 
-// Start an rpc service. By default the package scope Start will run all default services to provide with a working
+// Start a rpc service. By default, the package scope Start will run all default services to provide with a working
 // oCIS instance.
 func Start(o ...Option) error {
 	// Start the runtime. Most likely this was called ONLY by the `ocis server` subcommand, but since we cannot protect

services/proxy/pkg/config/defaults/defaultconfig.go

@@ -122,6 +122,11 @@ func DefaultPolicies() []config.Policy {
 					Endpoint: "/archiver",
 					Service:  "com.owncloud.web.frontend",
 				},
+				{
+					// reroute oc10 notifications endpoint to userlog service
+					Endpoint: "/ocs/v2.php/apps/notifications/api/v1/notifications/sse",
+					Service:  "com.owncloud.sse.sse",
+				},
 				{
 					// reroute oc10 notifications endpoint to userlog service
 					Endpoint: "/ocs/v2.php/apps/notifications/api/v1/notifications",

services/sse/Makefile

@@ -0,0 +1,37 @@
+SHELL := bash
+NAME := sse
+
+include ../../.make/recursion.mk
+
+############ tooling ############
+ifneq (, $(shell command -v go 2> /dev/null)) # suppress `command not found warnings` for non go targets in CI
+include ../../.bingo/Variables.mk
+endif
+
+############ go tooling ############
+include ../../.make/go.mk
+
+############ release ############
+include ../../.make/release.mk
+
+############ docs generate ############
+include ../../.make/docs.mk
+
+.PHONY: docs-generate
+docs-generate: config-docs-generate
+
+############ generate ############
+include ../../.make/generate.mk
+
+.PHONY: ci-go-generate
+ci-go-generate: # CI runs ci-node-generate automatically before this target
+
+.PHONY: ci-node-generate
+ci-node-generate:
+
+############ licenses ############
+.PHONY: ci-node-check-licenses
+ci-node-check-licenses:
+
+.PHONY: ci-node-save-licenses
+ci-node-save-licenses:

services/sse/README.md

@@ -0,0 +1,7 @@
+# SSE
+
+The `sse` service is responsible for sending sse (Server-Sent Events) to a user. See [What is Server-Sent Events](https://medium.com/yemeksepeti-teknoloji/what-is-server-sent-events-sse-and-how-to-implement-it-904938bffd73) for a simple introduction and examples of server sent events.
+
+## Subscribing
+
+Clients can subscribe to the `/sse` endpoint to be informed by the server when an event happens. The `sse` endpoint will respect language changes of the user without needing to reconnect. Note that SSE has a limitation of six open connections per browser which can be reached if one has opened various tabs of the Web UI pointing to the same Infinite Scale instance.

services/sse/cmd/sse/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"os"
+
+	"github.com/owncloud/ocis/v2/services/sse/pkg/command"
+	"github.com/owncloud/ocis/v2/services/sse/pkg/config/defaults"
+)
+
+func main() {
+	if err := command.Execute(defaults.DefaultConfig()); err != nil {
+		os.Exit(1)
+	}
+}

services/sse/pkg/command/health.go

@@ -0,0 +1,62 @@
+package command
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/owncloud/ocis/v2/ocis-pkg/log"
+
+	"github.com/urfave/cli/v2"
+
+	"github.com/owncloud/ocis/v2/ocis-pkg/config/configlog"
+	"github.com/owncloud/ocis/v2/services/sse/pkg/config"
+	"github.com/owncloud/ocis/v2/services/sse/pkg/config/parser"
+)
+
+// Health is the entrypoint for the health command.
+func Health(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "health",
+		Usage:    "check health status",
+		Category: "info",
+		Before: func(c *cli.Context) error {
+			return configlog.ReturnError(parser.ParseConfig(cfg))
+		},
+		Action: func(c *cli.Context) error {
+			logger := log.NewLogger(
+				log.Name(cfg.Service.Name),
+				log.Level(cfg.Log.Level),
+				log.Pretty(cfg.Log.Pretty),
+				log.Color(cfg.Log.Color),
+				log.File(cfg.Log.File),
+			)
+
+			resp, err := http.Get(
+				fmt.Sprintf(
+					"http://%s/healthz",
+					cfg.Debug.Addr,
+				),
+			)
+
+			if err != nil {
+				logger.Fatal().
+					Err(err).
+					Msg("Failed to request health check")
+			}
+
+			defer resp.Body.Close()
+
+			if resp.StatusCode != http.StatusOK {
+				logger.Fatal().
+					Int("code", resp.StatusCode).
+					Msg("Health seems to be in bad state")
+			}
+
+			logger.Debug().
+				Int("code", resp.StatusCode).
+				Msg("Health got a good state")
+
+			return nil
+		},
+	}
+}

services/sse/pkg/command/root.go

@@ -0,0 +1,30 @@
+package command
+
+import (
+	"os"
+
+	"github.com/urfave/cli/v2"
+
+	"github.com/owncloud/ocis/v2/ocis-pkg/clihelper"
+	"github.com/owncloud/ocis/v2/services/sse/pkg/config"
+)
+
+// GetCommands provides all commands for this service
+func GetCommands(cfg *config.Config) cli.Commands {
+	return []*cli.Command{
+		Server(cfg),
+		Health(cfg),
+		Version(cfg),
+	}
+}
+
+// Execute is the entry point for the sse command.
+func Execute(cfg *config.Config) error {
+	app := clihelper.DefaultApp(&cli.App{
+		Name:     "sse",
+		Usage:    "Serve ownCloud sse for oCIS",
+		Commands: GetCommands(cfg),
+	})
+
+	return app.Run(os.Args)
+}