config validation

1 files changed, 43 insertions, 1 deletions

diff --git a/config/config.go b/config/config.go
index 4c23ba1..62e7136 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,6 +1,11 @@
 package config
 
-import "time"
+import (
+	"fmt"
+	"os"
+	"regexp"
+	"time"
+)
 
 type Config struct {
 	Domain   string
@@ -18,3 +23,40 @@ type Handler struct {
 	DedupWindow       time.Duration
 	Interval          time.Duration
 }
+
+func (c *Config) Validate() error {
+	if c.Domain == "" {
+		return fmt.Errorf("domain cant be blank")
+	}
+	if c.DbPath == "" {
+		return fmt.Errorf("dbPath cant be blank")
+	}
+	// TODO do we care?
+	if len(c.Handlers) == 0 {
+		return fmt.Errorf("no [[handlers]] defined, nothing to do")
+	}
+
+	r, _ := regexp.Compile("[A-Za-z0-9]+")
+
+	for _, handler := range c.Handlers {
+		if handler.Name == "" {
+			return fmt.Errorf("handler name cant be blank")
+		}
+
+		matches := r.FindAllString(handler.Name, -1)
+		if len(matches) != 1 {
+			return fmt.Errorf("handler names can only be [A-Za-z0-9]")
+		}
+		if handler.Interval == 0 {
+			return fmt.Errorf("handler %s needs interval", handler.Name)
+		}
+		if handler.Exec == "" {
+			return fmt.Errorf("handler %s exec cant be blank", handler.Name)
+		}
+		if _, err := os.Stat(handler.Exec); err != nil {
+			return fmt.Errorf("handler %s exec %s does not exist or is not readable", handler.Name, handler.Exec)
+		}
+
+	}
+	return nil
+}