adds a health service for determining the status of the workers

This commit adds a health service which ensures that at least
one worker is active. Uses `isActive()` to determine if the
worker is ready. The health service runs on a seperate address.
Will return a HTTP 200 if health, HTTP 500 otherwise.

Fixes #192

Signed-off-by: Alex Price <[email protected]>

1 files changed, 32 insertions, 0 deletions

diff --git a/service/health/config.go b/service/health/config.go
new file mode 100644
index 00000000..60a52d6e
--- /dev/null
+++ b/service/health/config.go
@@ -0,0 +1,32 @@
+package health
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/spiral/roadrunner/service"
+)
+
+// Config configures the health service
+type Config struct {
+	// Address to listen on
+	Address string
+}
+
+// Hydrate the config
+func (c *Config) Hydrate(cfg service.Config) error {
+	if err := cfg.Unmarshal(c); err != nil {
+		return err
+	}
+	return c.Valid()
+}
+
+// Valid validates the configuration.
+func (c *Config) Valid() error {
+	// Validate the address
+	if c.Address != "" && !strings.Contains(c.Address, ":") {
+		return errors.New("malformed http server address")
+	}
+
+	return nil
+}