initial release

internal/config/config.go

@@ -0,0 +1,43 @@
+package config
+
+import (
+	"errors"
+	"io"
+	"os"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type Contract struct {
+	Network      string `yaml:"network"`
+	Address      string `yaml:"address"`
+	MaxTokenId   string `yaml:"max_token_id"`
+	FromBlock    string `yaml:"from_block"` // kept for backward compatibility, maps to MaxTokenId
+}
+
+type File struct {
+	Contracts map[string]Contract `yaml:"contracts"`
+}
+
+func Load(path string) (*File, error) {
+	if path == "" { return &File{Contracts: map[string]Contract{}}, nil }
+	f, err := os.Open(path)
+	if err != nil { return nil, err }
+	defer f.Close()
+	b, err := io.ReadAll(f)
+	if err != nil { return nil, err }
+	var cfg File
+	if err := yaml.Unmarshal(b, &cfg); err != nil { return nil, err }
+	if cfg.Contracts == nil { cfg.Contracts = map[string]Contract{} }
+	return &cfg, nil
+}
+
+func (f *File) Get(name string) (Contract, bool) {
+	c, ok := f.Contracts[name]
+	return c, ok
+}
+
+func (c Contract) Validate() error {
+	if c.Network == "" || c.Address == "" { return errors.New("missing network or address") }
+	return nil
+}