parse the rules

Signed-off-by: Jess Frazelle <[email protected]>

rules/rules.go

@@ -0,0 +1,30 @@
+package rules
+
+import (
+	"fmt"
+	"io/ioutil"
+
+	"github.com/BurntSushi/toml"
+	"github.com/jessfraz/bpfd/types"
+)
+
+// Parse parses the rules files and returns an array of rules for each program.
+func Parse(files ...string) (map[string][]types.Rule, error) {
+	rules := map[string][]types.Rule{}
+
+	for _, file := range files {
+		b, err := ioutil.ReadFile(file)
+		if err != nil {
+			return nil, fmt.Errorf("reading file %s failed: %v", file, err)
+		}
+
+		var rule types.Rule
+		if _, err := toml.Decode(string(b), &rule); err != nil {
+			return nil, fmt.Errorf("decoding file %s as rule failed: %v", file, err)
+		}
+
+		rules[rule.Program] = append(rules[rule.Program], rule)
+	}
+
+	return rules, nil
+}