Refactoring (#101)

* Make naming consistent for watched_contracts

* Update FindContract and FindBlockByNumber to return errors rather than nil

cmd/watch_contract/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"flag"
+
+	"github.com/8thlight/vulcanizedb/cmd"
+	"github.com/8thlight/vulcanizedb/pkg/core"
+	"github.com/8thlight/vulcanizedb/pkg/geth"
+)
+
+func main() {
+	environment := flag.String("environment", "", "Environment name")
+	contractHash := flag.String("contract-hash", "", "contract-hash=x1234")
+	abiFilepath := flag.String("abi-filepath", "", "path/to/abifile.json")
+	flag.Parse()
+
+	contractAbiString := cmd.GetAbi(*abiFilepath, *contractHash)
+	config := cmd.LoadConfig(*environment)
+	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
+	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
+	watchedContract := core.Contract{
+		Abi:  contractAbiString,
+		Hash: *contractHash,
+	}
+	repository.CreateContract(watchedContract)
+}