From 19225fc5d478315db8fc44a37b1cb9bfd1991708 Mon Sep 17 00:00:00 2001
From: Jae Kwon <jae@tendermint.com>
Date: Mon, 22 Oct 2018 02:42:40 -0700
Subject: [PATCH] Print debugging info

---
 x/distribution/types/fee_pool.go       | 26 +++++++++++++++++++++++++-
 x/distribution/types/validator_info.go | 13 +++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/x/distribution/types/fee_pool.go b/x/distribution/types/fee_pool.go
index ae1d72cc01..759519c9e2 100644
--- a/x/distribution/types/fee_pool.go
+++ b/x/distribution/types/fee_pool.go
@@ -1,7 +1,10 @@
 package types
 
 import (
+	"fmt"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	cmn "github.com/tendermint/tendermint/libs/common"
 )
 
 // total accumulation tracker
@@ -29,6 +32,27 @@ func (ta TotalAccum) UpdateForNewHeight(height int64, accumCreatedPerBlock sdk.D
 	return ta
 }
 
+// update total validator accumulation factor for the new height
+// CONTRACT: height should be greater than the old height
+func (ta TotalAccum) UpdateForNewHeight_DEBUG(height int64, accumCreatedPerBlock sdk.Dec) TotalAccum {
+	blocks := height - ta.UpdateHeight
+	if blocks < 0 {
+		panic("reverse updated for new height")
+	}
+	fmt.Println(
+		cmn.Blue(
+			fmt.Sprintf("FP Add %v * %v = %v +=> %v",
+				accumCreatedPerBlock, sdk.NewInt(blocks),
+				accumCreatedPerBlock.MulInt(sdk.NewInt(blocks)),
+				ta.Accum.Add(accumCreatedPerBlock.MulInt(sdk.NewInt(blocks))),
+			),
+		),
+	)
+	ta.Accum = ta.Accum.Add(accumCreatedPerBlock.MulInt(sdk.NewInt(blocks)))
+	ta.UpdateHeight = height
+	return ta
+}
+
 //___________________________________________________________________________________________
 
 // global fee pool for distribution
@@ -41,7 +65,7 @@ type FeePool struct {
 // update total validator accumulation factor
 // NOTE: Do not call this except from ValidatorDistInfo.TakeFeePoolRewards().
 func (f FeePool) UpdateTotalValAccum(height int64, totalBondedTokens sdk.Dec) FeePool {
-	f.TotalValAccum = f.TotalValAccum.UpdateForNewHeight(height, totalBondedTokens)
+	f.TotalValAccum = f.TotalValAccum.UpdateForNewHeight_DEBUG(height, totalBondedTokens)
 	return f
 }
 
diff --git a/x/distribution/types/validator_info.go b/x/distribution/types/validator_info.go
index 1744e3baac..e082c2ee83 100644
--- a/x/distribution/types/validator_info.go
+++ b/x/distribution/types/validator_info.go
@@ -1,7 +1,10 @@
 package types
 
 import (
+	"fmt"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	cmn "github.com/tendermint/tendermint/libs/common"
 )
 
 // distribution info for a particular validator
@@ -62,6 +65,16 @@ func (vi ValidatorDistInfo) TakeFeePoolRewards(fp FeePool, height int64, totalBo
 	commission := withdrawalTokens.MulDec(commissionRate)
 	afterCommission := withdrawalTokens.Minus(commission)
 
+	fmt.Println(
+		cmn.Red(
+			fmt.Sprintf("FP Sub %v * %v = %v -=> %v",
+				vdTokens, sdk.NewInt(blocks),
+				accum,
+				fp.TotalValAccum.Accum.Sub(accum),
+			),
+		),
+	)
+
 	fp.TotalValAccum.Accum = fp.TotalValAccum.Accum.Sub(accum)
 	fp.Pool = remainingTokens
 	vi.PoolCommission = vi.PoolCommission.Plus(commission)