rename to collator.go and implement the watchShards func

Former-commit-id: a408cce4805fab38dd0d52d8743c4d00b82133ee [formerly 01b8b29da9443a10ba632f386385e4bc9fc86a84]
Former-commit-id: a88f703397c4f0a90414b1769a499bd108dcff05

sharding/collator.go

@@ -27,6 +27,15 @@ func subscribeBlockHeaders(c *Client) error {
 		case head := <-headerChan:
 			// Query the current state to see if we are an eligible proposer
 			log.Info(fmt.Sprintf("received new header %v", head.Number.String()))
+			// TODO: Only run this code on certain periods?
+			watchShards(head)
 		}
 	}
 }
+
+// watchShards checks if we are an eligible proposer for collation for
+// the available shards in the VMC. The function calls getEligibleProposer from
+// the VMC and proposes a collation if conditions are met
+func watchShards(head types.Header) {
+
+}

sharding/vmc.go

@@ -71,9 +71,10 @@ func initVMC(c *Client) error {
 // the account is not in the set, it will deposit 100ETH into contract.
 func initVMCValidator(c *Client) error {
 
-	// TODO: Check if account is already in validator set. Do we need to implement
-	// a func in solidity to do this?
+	// TODO: Check if account is already in validator set. Fetch this From
+	// the VMC contract's validator set.
 
+	// Unlocks the current account from the keystore
 	accounts := c.keystore.Accounts()
 	if len(accounts) == 0 {
 		return fmt.Errorf("no accounts found")
@@ -96,10 +97,11 @@ func initVMCValidator(c *Client) error {
 		},
 	}
 
-	tx, err := c.vmc.VMCTransactor.Deposit(&ops, /* validatorcodeaddr */, accounts[0].Address)
+	_, err := c.vmc.VMCTransactor.Deposit(&ops, accounts[0].Address)
 	if err != nil {
 		return fmt.Errorf("unable to deposit eth and become a validator: %v", err)
 	}
+	log.Info(fmt.Sprintf("deposited 100ETH into contract"))
 	return nil
 
 }