AVM: Provide access to some more block header values (#6107)

data/transactions/logic/TEAL_opcodes_v10.md

@@ -1638,7 +1638,7 @@ Fields
 
 | Index | Name | Type | Notes |
 | - | ------ | -- | --------- |
-| 0 | BlkSeed | []byte |  |
+| 0 | BlkSeed | [32]byte |  |
 | 1 | BlkTimestamp | uint64 |  |
 
 

data/transactions/logic/TEAL_opcodes_v7.md

@@ -1476,6 +1476,6 @@ Fields
 
 | Index | Name | Type | Notes |
 | - | ------ | -- | --------- |
-| 0 | BlkSeed | []byte |  |
+| 0 | BlkSeed | [32]byte |  |
 | 1 | BlkTimestamp | uint64 |  |
 

data/transactions/logic/TEAL_opcodes_v8.md

@@ -1635,6 +1635,6 @@ Fields
 
 | Index | Name | Type | Notes |
 | - | ------ | -- | --------- |
-| 0 | BlkSeed | []byte |  |
+| 0 | BlkSeed | [32]byte |  |
 | 1 | BlkTimestamp | uint64 |  |
 

data/transactions/logic/TEAL_opcodes_v9.md

@@ -1635,6 +1635,6 @@ Fields
 
 | Index | Name | Type | Notes |
 | - | ------ | -- | --------- |
-| 0 | BlkSeed | []byte |  |
+| 0 | BlkSeed | [32]byte |  |
 | 1 | BlkTimestamp | uint64 |  |
 

data/transactions/logic/assembler_test.go

@@ -1700,11 +1700,21 @@ global AssetCreateMinBalance
 global AssetOptInMinBalance
 global GenesisHash
 pushint 1
+block BlkBranch
+pushint 1
+block BlkFeeSink
+pushint 1
+block BlkProtocol
+pushint 1
+block BlkTxnCounter
+pushint 1
 block BlkProposer
 pushint 1
 block BlkFeesCollected
 pushint 1
 block BlkBonus
+pushint 1
+block BlkProposerPayout
 global PayoutsEnabled
 global PayoutsGoOnlineFee
 global PayoutsPercent

data/transactions/logic/eval.go

@@ -5771,12 +5771,24 @@ func opBlock(cx *EvalContext) error {
 			return fmt.Errorf("block(%d) timestamp %d < 0", round, hdr.TimeStamp)
 		}
 		cx.Stack[last] = stackValue{Uint: uint64(hdr.TimeStamp)}
+
+	case BlkBranch:
+		cx.Stack[last].Bytes = hdr.Branch[:]
+	case BlkFeeSink:
+		cx.Stack[last].Bytes = hdr.FeeSink[:]
+	case BlkProtocol:
+		cx.Stack[last].Bytes = []byte(hdr.CurrentProtocol)
+	case BlkTxnCounter:
+		cx.Stack[last] = stackValue{Uint: hdr.TxnCounter}
+
 	case BlkProposer:
 		cx.Stack[last].Bytes = hdr.Proposer[:]
 	case BlkFeesCollected:
 		cx.Stack[last] = stackValue{Uint: hdr.FeesCollected.Raw}
 	case BlkBonus:
 		cx.Stack[last] = stackValue{Uint: hdr.Bonus.Raw}
+	case BlkProposerPayout:
+		cx.Stack[last] = stackValue{Uint: hdr.ProposerPayout.Raw}
 	default:
 		return fmt.Errorf("invalid block field %s", fs.field)
 	}

data/transactions/logic/fields.go

@@ -997,6 +997,16 @@ const (
 	BlkFeesCollected
 	// BlkBonus is the extra amount to be paid for the given block (from FeeSink)
 	BlkBonus
+	// BlkBranch is the hash of the previous block
+	BlkBranch
+	// BlkFeeSink is the fee sink for the given round
+	BlkFeeSink
+	// BlkProtocol is the ConsensusVersion of the block.
+	BlkProtocol
+	// BlkTxnCounter is the number of the next transaction after the block
+	BlkTxnCounter
+	// BlkProposerPayout is the actual amount moved from feesink to proposer
+	BlkProposerPayout
 
 	invalidBlockField // compile-time constant for number of fields
 )
@@ -1010,11 +1020,16 @@ type blockFieldSpec struct {
 }
 
 var blockFieldSpecs = [...]blockFieldSpec{
-	{BlkSeed, StackBytes, randomnessVersion},
+	{BlkSeed, StackBytes32, randomnessVersion},
 	{BlkTimestamp, StackUint64, randomnessVersion},
 	{BlkProposer, StackAddress, incentiveVersion},
 	{BlkFeesCollected, StackUint64, incentiveVersion},
 	{BlkBonus, StackUint64, incentiveVersion},
+	{BlkBranch, StackBytes32, incentiveVersion},
+	{BlkFeeSink, StackAddress, incentiveVersion},
+	{BlkProtocol, StackBytes, incentiveVersion},
+	{BlkTxnCounter, StackUint64, incentiveVersion},
+	{BlkProposerPayout, StackUint64, incentiveVersion},
 }
 
 func blockFieldSpecByField(r BlockField) (blockFieldSpec, bool) {

data/transactions/logic/langspec_v10.json

@@ -4601,7 +4601,7 @@
         "BlkTimestamp"
       ],
       "ArgEnumTypes": [
-        "[]byte",
+        "[32]byte",
         "uint64"
       ],
       "DocCost": "1",

data/transactions/logic/langspec_v7.json

@@ -4249,7 +4249,7 @@
         "BlkTimestamp"
       ],
       "ArgEnumTypes": [
-        "[]byte",
+        "[32]byte",
         "uint64"
       ],
       "DocCost": "1",

data/transactions/logic/langspec_v8.json

@@ -4595,7 +4595,7 @@
         "BlkTimestamp"
       ],
       "ArgEnumTypes": [
-        "[]byte",
+        "[32]byte",
         "uint64"
       ],
       "DocCost": "1",

data/transactions/logic/langspec_v9.json

@@ -4595,7 +4595,7 @@
         "BlkTimestamp"
       ],
       "ArgEnumTypes": [
-        "[]byte",
+        "[32]byte",
         "uint64"
       ],
       "DocCost": "1",

test/scripts/e2e_subs/hdr-access.py

@@ -1,8 +1,10 @@
 #!/usr/bin/env python
 
+import base64
 import os
 import sys
 from goal import Goal
+import algosdk.encoding as enc
 
 from datetime import datetime
 
@@ -43,13 +45,10 @@
 txinfo, err = goal.app_create(joe, goal.assemble(teal))
 assert "not available" in str(err), err
 
-# We want to manipulate lastvalid, so we need to turn off autosend
-goal.autosend = False
-
-# We will be able to access two blocks, by setting lv explcitly. So we
-# test that the block timestamp from two blocks ago is between 2 and 5
-# (inclusive) seconds before the previous block timestamp. devMode
-# might mess this test up.
+# We will be able to access more than one previous block by using a
+# shorter tx liftetime. So we test that the block timestamp from two
+# blocks ago is between 2 and 5 (inclusive) seconds before the
+# previous block timestamp. devMode might mess this test up.
 teal = """
 #pragma version 7
  txn FirstValid
@@ -73,10 +72,7 @@
  int 6
  <
 """
-checktimes = goal.assemble(teal)
-tx = goal.app_create(joe, goal.assemble(teal))
-tx.last_valid_round = tx.last_valid_round - 800
-txinfo, err = goal.send(tx)
+txinfo, err = goal.app_create(joe, goal.assemble(teal), lifetime=100)
 assert not err, err
 
 # block 0 is not accessible even with a low LastValid
@@ -85,11 +81,33 @@
  int 0
  block BlkTimestamp
 """
-tx = goal.app_create(joe, goal.assemble(teal))
-tx.last_valid_round = tx.last_valid_round - 800
-txinfo, err = goal.send(tx)
+txinfo, err = goal.app_create(joe, goal.assemble(teal), lifetime=100)
 assert "round 0 is not available" in str(err), err
 assert "outside [1-" in str(err), err  # confirms that we can look back to 1
 
+
+# Get FeeSink from `block` opcode, compare to REST API
+teal = """
+#pragma version 11
+ txn FirstValid
+ int 2
+ -
+ block BlkFeeSink
+ log
+ int 1
+ return
+"""
+txinfo, err = goal.app_create(joe, goal.assemble(teal), lifetime=100)
+assert not err, err
+assert len(txinfo["logs"]) == 1
+opcode = txinfo["logs"][0]
+
+block = goal.algod.block_info(txinfo['confirmed-round']-2)['block']
+api = base64.b64encode(enc.decode_address(block['fees'])).decode("utf-8")
+
+print(opcode, api)
+
+assert opcode == api
+
 stamp = datetime.now().strftime("%Y%m%d_%H%M%S")
 print(f"{os.path.basename(sys.argv[0])} OK {stamp}")