4 files changed, 194 insertions, 0 deletions
diff --git a/plugins/checker/config.go b/plugins/checker/config.go
new file mode 100644
index 00000000..5f952592
--- /dev/null
+++ b/plugins/checker/config.go
@@ -0,0 +1,5 @@
+package checker
+
+type Config struct {
+	Address string
+}
diff --git a/plugins/checker/interface.go b/plugins/checker/interface.go
new file mode 100644
index 00000000..dd9dcada
--- /dev/null
+++ b/plugins/checker/interface.go
@@ -0,0 +1,11 @@
+package checker
+
+// Status consists of status code from the service
+type Status struct {
+	Code int
+}
+
+// Checker interface used to get latest status from plugin
+type Checker interface {
+	Status() Status
+}
diff --git a/plugins/checker/plugin.go b/plugins/checker/plugin.go
new file mode 100644
index 00000000..95f4f68c
--- /dev/null
+++ b/plugins/checker/plugin.go
@@ -0,0 +1,151 @@
+package checker
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/gofiber/fiber/v2"
+	fiberLogger "github.com/gofiber/fiber/v2/middleware/logger"
+	"github.com/spiral/endure"
+	"github.com/spiral/errors"
+	"github.com/spiral/roadrunner/v2/plugins/config"
+	"github.com/spiral/roadrunner/v2/plugins/logger"
+)
+
+const (
+	// PluginName declares public plugin name.
+	PluginName = "status"
+)
+
+type Plugin struct {
+	registry map[string]Checker
+	server   *fiber.App
+	log      logger.Logger
+	cfg      *Config
+}
+
+func (c *Plugin) Init(log logger.Logger, cfg config.Configurer) error {
+	const op = errors.Op("status plugin init")
+	err := cfg.UnmarshalKey(PluginName, &c.cfg)
+	if err != nil {
+		return errors.E(op, errors.Disabled, err)
+	}
+
+	if c.cfg == nil {
+		return errors.E(errors.Disabled)
+	}
+
+	c.registry = make(map[string]Checker)
+	c.log = log
+	return nil
+}
+
+func (c *Plugin) Serve() chan error {
+	errCh := make(chan error, 1)
+	c.server = fiber.New(fiber.Config{
+		ReadTimeout:  time.Second * 5,
+		WriteTimeout: time.Second * 5,
+		IdleTimeout:  time.Second * 5,
+	})
+	c.server.Group("/v1", c.healthHandler)
+	c.server.Use(fiberLogger.New())
+	c.server.Use("/health", c.healthHandler)
+
+	go func() {
+		err := c.server.Listen(c.cfg.Address)
+		if err != nil {
+			errCh <- err
+		}
+	}()
+
+	return errCh
+}
+
+func (c *Plugin) Stop() error {
+	const op = errors.Op("checker stop")
+	err := c.server.Shutdown()
+	if err != nil {
+		return errors.E(op, err)
+	}
+	return nil
+}
+
+// Reset named service.
+func (c *Plugin) Status(name string) (Status, error) {
+	const op = errors.Op("get status")
+	svc, ok := c.registry[name]
+	if !ok {
+		return Status{}, errors.E(op, errors.Errorf("no such service: %s", name))
+	}
+
+	return svc.Status(), nil
+}
+
+// CollectTarget collecting services which can provide Status.
+func (c *Plugin) CollectTarget(name endure.Named, r Checker) error {
+	c.registry[name.Name()] = r
+	return nil
+}
+
+// Collects declares services to be collected.
+func (c *Plugin) Collects() []interface{} {
+	return []interface{}{
+		c.CollectTarget,
+	}
+}
+
+// Name of the service.
+func (c *Plugin) Name() string {
+	return PluginName
+}
+
+// RPCService returns associated rpc service.
+func (c *Plugin) RPC() interface{} {
+	return &rpc{srv: c, log: c.log}
+}
+
+type Plugins struct {
+	Plugins []string `query:"plugin"`
+}
+
+const template string = "Service: %s: Status: %d\n"
+
+func (c *Plugin) healthHandler(ctx *fiber.Ctx) error {
+	const op = errors.Op("health_handler")
+	plugins := &Plugins{}
+	err := ctx.QueryParser(plugins)
+	if err != nil {
+		return errors.E(op, err)
+	}
+
+	if len(plugins.Plugins) == 0 {
+		ctx.Status(http.StatusOK)
+		_, _ = ctx.WriteString("No plugins provided in query. Query should be in form of: /v1/health?plugin=plugin1&plugin=plugin2 \n")
+		return nil
+	}
+
+	failed := false
+	// iterate over all provided plugins
+	for i := 0; i < len(plugins.Plugins); i++ {
+		// check if the plugin exists
+		if plugin, ok := c.registry[plugins.Plugins[i]]; ok {
+			st := plugin.Status()
+			if st.Code >= 500 {
+				failed = true
+				continue
+			} else if st.Code >= 100 && st.Code <= 400 {
+				_, _ = ctx.WriteString(fmt.Sprintf(template, plugins.Plugins[i], st.Code))
+			}
+		} else {
+			_, _ = ctx.WriteString(fmt.Sprintf("Service: %s not found", plugins.Plugins[i]))
+		}
+	}
+	if failed {
+		ctx.Status(http.StatusInternalServerError)
+		return nil
+	}
+
+	ctx.Status(http.StatusOK)
+	return nil
+}
diff --git a/plugins/checker/rpc.go b/plugins/checker/rpc.go
new file mode 100644
index 00000000..0daa62fe
--- /dev/null
+++ b/plugins/checker/rpc.go
@@ -0,0 +1,27 @@
+package checker
+
+import (
+	"github.com/spiral/errors"
+	"github.com/spiral/roadrunner/v2/plugins/logger"
+)
+
+type rpc struct {
+	srv *Plugin
+	log logger.Logger
+}
+
+// Status return current status of the provided plugin
+func (rpc *rpc) Status(service string, status *Status) error {
+	const op = errors.Op("status")
+	rpc.log.Debug("started Status method", "service", service)
+	st, err := rpc.srv.Status(service)
+	if err != nil {
+		return errors.E(op, err)
+	}
+
+	*status = st
+
+	rpc.log.Debug("status code", "code", st.Code)
+	rpc.log.Debug("successfully finished Status method")
+	return nil
+}