add: token syncer

core:
- add koanf for runtime config loading
- cicnet connection must dial else panic
- add db connection init
- add goyesql for convenient querying
- add async tasker processor (scheduler, processor)

dev:
- add redis server to dev docker-compose
- update volume to prune-able local

pkg/cicnet/cicnet.go

@@ -10,16 +10,13 @@ type CicNet struct {
 	tokenIndex common.Address
 }
 
-func NewCicNet(rpcEndpoint string, tokenIndex common.Address) (*CicNet, error) {
-	ethClient, err := w3.Dial(rpcEndpoint)
-	if err != nil {
-		return &CicNet{}, err
-	}
+func NewCicNet(rpcEndpoint string, tokenIndex common.Address) *CicNet {
+	ethClient := w3.MustDial(rpcEndpoint)
 
 	return &CicNet{
 		ethClient:  ethClient,
 		tokenIndex: tokenIndex,
-	}, nil
+	}
 }
 
 func (c *CicNet) Close() error {

pkg/cicnet/token_index.go

@@ -6,6 +6,7 @@ import (
 	"github.com/lmittmann/w3"
 	"github.com/lmittmann/w3/module/eth"
 	"math/big"
+	"strings"
 )
 
 func (c *CicNet) EntryCount(ctx context.Context) (big.Int, error) {
@@ -22,7 +23,7 @@ func (c *CicNet) EntryCount(ctx context.Context) (big.Int, error) {
 	return tokenCount, nil
 }
 
-func (c *CicNet) AddressAtIndex(ctx context.Context, index *big.Int) (common.Address, error) {
+func (c *CicNet) AddressAtIndex(ctx context.Context, index *big.Int) (string, error) {
 	var address common.Address
 
 	err := c.ethClient.CallCtx(
@@ -30,8 +31,9 @@ func (c *CicNet) AddressAtIndex(ctx context.Context, index *big.Int) (common.Add
 		eth.CallFunc(w3.MustNewFunc("entry(uint256 _idx)", "address"), c.tokenIndex, index).Returns(&address),
 	)
 	if err != nil {
-		return [20]byte{}, err
+		return "", err
 	}
 
-	return address, nil
+	// strip 0x at pkg level
+	return strings.Trim(address.String(), "0x"), nil
 }