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server/config.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+	"gopkg.in/yaml.v3"
+	"os"
+)
+
+type Config struct {
+	Links   []Link `yaml:"links"`
+	Monitor []Item `yaml:"monitor"`
+	Exec    []Item `yaml:"exec"`
+}
+
+func loadConfig(path string) (*Config, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	var cfg Config
+	dec := yaml.NewDecoder(f)
+	dec.KnownFields(true)
+	if err := dec.Decode(&cfg); err != nil {
+		return nil, fmt.Errorf("parse %s: %w", path, err)
+	}
+	seen := map[string]bool{} // item names are global keys (monVals, RunScript)
+	for _, l := range cfg.Links {
+		if seen[l.Name] {
+			return nil, fmt.Errorf("duplicate name %q", l.Name)
+		}
+		seen[l.Name] = true
+	}
+	for _, list := range [][]Item{cfg.Monitor, cfg.Exec} {
+		for _, it := range list {
+			if seen[it.Name] {
+				return nil, fmt.Errorf("duplicate name %q", it.Name)
+			}
+			seen[it.Name] = true
+		}
+	}
+	for _, it := range cfg.Monitor {
+		if it.Refresh <= 0 {
+			return nil, fmt.Errorf("monitor %q: refresh must be > 0", it.Name)
+		}
+		if it.Data != "text" && it.Data != "percentage" {
+			return nil, fmt.Errorf("monitor %q: data must be text|percentage", it.Name)
+		}
+	}
+	for _, it := range cfg.Exec {
+		if len(it.ArgTypes) != it.Args {
+			return nil, fmt.Errorf("exec %q: arg_types must have args entries", it.Name)
+		}
+		for _, t := range it.ArgTypes {
+			if t != "text" && t != "number" {
+				return nil, fmt.Errorf("exec %q: arg type must be text|number", it.Name)
+			}
+		}
+	}
+	return &cfg, nil
+}