Update coordinator to work better under real net

- cli / node
    - Update handler of SIGINT so that after 3 SIGINTs, the process terminates
      unconditionally
- coordinator
    - Store stats without pointer
    - In all functions that send a variable via channel, check for context done
      to avoid deadlock (due to no process reading from the channel, which has
      no queue) when the node is stopped.
    - Abstract `canForge` so that it can be used outside of the `Coordinator`
    - In `canForge` check the blockNumber in current and next slot.
    - Update tests due to smart contract changes in slot handling, and minimum
      bid defaults
    - TxManager
        - Add consts, vars and stats to allow evaluating `canForge`
        - Add `canForge` method (not used yet)
        - Store batch and nonces status (last success and last pending)
        - Track nonces internally instead of relying on the ethereum node (this
          is required to work with ganache when there are pending txs)
        - Handle the (common) case of the receipt not being found after the tx
          is sent.
        - Don't start the main loop until we get an initial messae fo the stats
          and vars (so that in the loop the stats and vars are set to
          synchronizer values)
- eth / ethereum client
    - Add necessary methods to create the auth object for transactions manually
      so that we can set the nonce, gas price, gas limit, etc manually
    - Update `RollupForgeBatch` to take an auth object as input (so that the
      coordinator can set parameters manually)
- synchronizer
    - In stats, add `NextSlot`

cli/node/.gitignore

@@ -1 +1,2 @@
 cfg.example.secret.toml
+cfg.toml

cli/node/cfg.buidler.toml

@@ -39,12 +39,12 @@ TokenHEZ = "0x5D94e3e7aeC542aB0F9129B9a7BAdeb5B3Ca0f77"
 TokenHEZName = "Hermez Network Token"
 
 [Coordinator]
-# ForgerAddress = "0x05c23b938a85ab26A36E6314a0D02080E9ca6BeD" # Non-Boot Coordinator
+ForgerAddress = "0x05c23b938a85ab26A36E6314a0D02080E9ca6BeD" # Non-Boot Coordinator
 # ForgerAddressPrivateKey = "0x30f5fddb34cd4166adb2c6003fa6b18f380fd2341376be42cf1c7937004ac7a3"
-ForgerAddress = "0xb4124ceb3451635dacedd11767f004d8a28c6ee7" # Boot Coordinator
+# ForgerAddress = "0xb4124ceb3451635dacedd11767f004d8a28c6ee7" # Boot Coordinator
 # ForgerAddressPrivateKey = "0xa8a54b2d8197bc0b19bb8a084031be71835580a01e70a45a13babd16c9bc1563"
 ConfirmBlocks = 10
-L1BatchTimeoutPerc = 0.4
+L1BatchTimeoutPerc = 0.999
 ProofServerPollInterval = "1s"
 ForgeRetryInterval = "500ms"
 SyncRetryInterval = "1s"
@@ -82,7 +82,7 @@ ReceiptTimeout      = "60s"
 ReceiptLoopInterval = "500ms"
 CheckLoopInterval = "500ms"
 Attempts = 4
-AttemptsDelay = "200ms"
+AttemptsDelay = "500ms"
 CallGasLimit = 300000
 GasPriceDiv = 100
 

cli/node/main.go

@@ -119,10 +119,17 @@ func cmdRun(c *cli.Context) error {
 	// catch ^C to send the stop signal
 	ossig := make(chan os.Signal, 1)
 	signal.Notify(ossig, os.Interrupt)
+	const forceStopCount = 3
 	go func() {
+		n := 0
 		for sig := range ossig {
 			if sig == os.Interrupt {
+				log.Info("Received Interrupt Signal")
 				stopCh <- nil
+				n++
+				if n == forceStopCount {
+					log.Fatalf("Received %v Interrupt Signals", forceStopCount)
+				}
 			}
 		}
 	}()