Fix genesis block response (#42)

* Get genesis hash from env

* Print error message if hash env is not set

server/rosetta/lib/internal/service/online.go

@@ -2,6 +2,8 @@ package service
 
 import (
 	"context"
+	"fmt"
+	"os"
 	"time"
 
 	"github.com/coinbase/rosetta-sdk-go/types"
@@ -11,30 +13,37 @@ import (
 )
 
 // genesisBlockFetchTimeout defines a timeout to fetch the genesis block
-const genesisBlockFetchTimeout = 15 * time.Second
+const (
+	genesisBlockFetchTimeout = 15 * time.Second
+	genesisHashEnv           = "GENESIS_HASH"
+)
 
 // NewOnlineNetwork builds a single network adapter.
 // It will get the Genesis block on the beginning to avoid calling it everytime.
 func NewOnlineNetwork(network *types.NetworkIdentifier, client crgtypes.Client) (crgtypes.API, error) {
-	//ctx, cancel := context.WithTimeout(context.Background(), genesisBlockFetchTimeout)
-	//defer cancel()
+	ctx, cancel := context.WithTimeout(context.Background(), genesisBlockFetchTimeout)
+	defer cancel()
 
-	/*var genesisHeight int64 = -1 // to use initial_height in genesis.json
+	var genesisHeight int64 = -1 // to use initial_height in genesis.json
 	block, err := client.BlockByHeight(ctx, &genesisHeight)
 	if err != nil {
 		return OnlineNetwork{}, err
-	}*/
+	}
 
-	block := types.BlockIdentifier{
-		Index: 9283650, // Theta upgrade height
-		Hash:  "0x09E5CC1760C63AB706C79D936024E35AE226D983724F3BB026C4BD1407CDB7FD",
+	// Get genesis hash from ENV. It should be set by an external script since is not possible to get
+	// using tendermint API
+	genesisHash := os.Getenv(genesisHashEnv)
+	if genesisHash == "" {
+		_ = fmt.Sprintf("[Warning]- Genesis hash env '%s' is not properly set!", genesisHashEnv)
 	}
 
+	block.Block.Hash = genesisHash
+
 	return OnlineNetwork{
 		client:                 client,
 		network:                network,
-		networkOptions:         networkOptionsFromClient(client, &block),
-		genesisBlockIdentifier: &block,
+		networkOptions:         networkOptionsFromClient(client, block.Block),
+		genesisBlockIdentifier: block.Block,
 	}, nil
 }