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https://github.com/btcsuite/btcd.git
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fdc2bc867b
This converts the majority of script errors from generic errors created via errors.New and fmt.Errorf to use a concrete type that implements the error interface with an error code and description. This allows callers to programmatically detect the type of error via type assertions and an error code while still allowing the errors to provide more context. For example, instead of just having an error the reads "disabled opcode" as would happen prior to these changes when a disabled opcode is encountered, the error will now read "attempt to execute disabled opcode OP_FOO". While it was previously possible to programmatically detect many errors due to them being exported, they provided no additional context and there were also various instances that were just returning errors created on the spot which callers could not reliably detect without resorting to looking at the actual error message, which is nearly always bad practice. Also, while here, export the MaxStackSize and MaxScriptSize constants since they can be useful for consumers of the package and perform some minor cleanup of some of the tests.
206 lines
6.9 KiB
Go
206 lines
6.9 KiB
Go
// Copyright (c) 2013-2017 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package txscript
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import (
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"bytes"
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"fmt"
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"strconv"
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"strings"
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"testing"
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)
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// TestOpcodeDisabled tests the opcodeDisabled function manually because all
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// disabled opcodes result in a script execution failure when executed normally,
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// so the function is not called under normal circumstances.
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func TestOpcodeDisabled(t *testing.T) {
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t.Parallel()
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tests := []byte{OP_CAT, OP_SUBSTR, OP_LEFT, OP_RIGHT, OP_INVERT,
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OP_AND, OP_OR, OP_2MUL, OP_2DIV, OP_MUL, OP_DIV, OP_MOD,
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OP_LSHIFT, OP_RSHIFT,
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}
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for _, opcodeVal := range tests {
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pop := parsedOpcode{opcode: &opcodeArray[opcodeVal], data: nil}
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err := opcodeDisabled(&pop, nil)
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if !IsErrorCode(err, ErrDisabledOpcode) {
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t.Errorf("opcodeDisabled: unexpected error - got %v, "+
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"want %v", err, ErrDisabledOpcode)
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continue
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}
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}
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}
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// TestOpcodeDisasm tests the print function for all opcodes in both the oneline
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// and full modes to ensure it provides the expected disassembly.
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func TestOpcodeDisasm(t *testing.T) {
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t.Parallel()
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// First, test the oneline disassembly.
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// The expected strings for the data push opcodes are replaced in the
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// test loops below since they involve repeating bytes. Also, the
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// OP_NOP# and OP_UNKNOWN# are replaced below too, since it's easier
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// than manually listing them here.
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oneBytes := []byte{0x01}
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oneStr := "01"
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expectedStrings := [256]string{0x00: "0", 0x4f: "-1",
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0x50: "OP_RESERVED", 0x61: "OP_NOP", 0x62: "OP_VER",
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0x63: "OP_IF", 0x64: "OP_NOTIF", 0x65: "OP_VERIF",
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0x66: "OP_VERNOTIF", 0x67: "OP_ELSE", 0x68: "OP_ENDIF",
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0x69: "OP_VERIFY", 0x6a: "OP_RETURN", 0x6b: "OP_TOALTSTACK",
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0x6c: "OP_FROMALTSTACK", 0x6d: "OP_2DROP", 0x6e: "OP_2DUP",
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0x6f: "OP_3DUP", 0x70: "OP_2OVER", 0x71: "OP_2ROT",
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0x72: "OP_2SWAP", 0x73: "OP_IFDUP", 0x74: "OP_DEPTH",
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0x75: "OP_DROP", 0x76: "OP_DUP", 0x77: "OP_NIP",
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0x78: "OP_OVER", 0x79: "OP_PICK", 0x7a: "OP_ROLL",
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0x7b: "OP_ROT", 0x7c: "OP_SWAP", 0x7d: "OP_TUCK",
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0x7e: "OP_CAT", 0x7f: "OP_SUBSTR", 0x80: "OP_LEFT",
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0x81: "OP_RIGHT", 0x82: "OP_SIZE", 0x83: "OP_INVERT",
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0x84: "OP_AND", 0x85: "OP_OR", 0x86: "OP_XOR",
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0x87: "OP_EQUAL", 0x88: "OP_EQUALVERIFY", 0x89: "OP_RESERVED1",
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0x8a: "OP_RESERVED2", 0x8b: "OP_1ADD", 0x8c: "OP_1SUB",
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0x8d: "OP_2MUL", 0x8e: "OP_2DIV", 0x8f: "OP_NEGATE",
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0x90: "OP_ABS", 0x91: "OP_NOT", 0x92: "OP_0NOTEQUAL",
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0x93: "OP_ADD", 0x94: "OP_SUB", 0x95: "OP_MUL", 0x96: "OP_DIV",
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0x97: "OP_MOD", 0x98: "OP_LSHIFT", 0x99: "OP_RSHIFT",
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0x9a: "OP_BOOLAND", 0x9b: "OP_BOOLOR", 0x9c: "OP_NUMEQUAL",
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0x9d: "OP_NUMEQUALVERIFY", 0x9e: "OP_NUMNOTEQUAL",
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0x9f: "OP_LESSTHAN", 0xa0: "OP_GREATERTHAN",
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0xa1: "OP_LESSTHANOREQUAL", 0xa2: "OP_GREATERTHANOREQUAL",
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0xa3: "OP_MIN", 0xa4: "OP_MAX", 0xa5: "OP_WITHIN",
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0xa6: "OP_RIPEMD160", 0xa7: "OP_SHA1", 0xa8: "OP_SHA256",
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0xa9: "OP_HASH160", 0xaa: "OP_HASH256", 0xab: "OP_CODESEPARATOR",
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0xac: "OP_CHECKSIG", 0xad: "OP_CHECKSIGVERIFY",
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0xae: "OP_CHECKMULTISIG", 0xaf: "OP_CHECKMULTISIGVERIFY",
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0xfa: "OP_SMALLINTEGER", 0xfb: "OP_PUBKEYS",
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0xfd: "OP_PUBKEYHASH", 0xfe: "OP_PUBKEY",
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0xff: "OP_INVALIDOPCODE",
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}
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for opcodeVal, expectedStr := range expectedStrings {
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var data []byte
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switch {
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// OP_DATA_1 through OP_DATA_65 display the pushed data.
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case opcodeVal >= 0x01 && opcodeVal < 0x4c:
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data = bytes.Repeat(oneBytes, opcodeVal)
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expectedStr = strings.Repeat(oneStr, opcodeVal)
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// OP_PUSHDATA1.
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case opcodeVal == 0x4c:
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data = bytes.Repeat(oneBytes, 1)
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expectedStr = strings.Repeat(oneStr, 1)
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// OP_PUSHDATA2.
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case opcodeVal == 0x4d:
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data = bytes.Repeat(oneBytes, 2)
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expectedStr = strings.Repeat(oneStr, 2)
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// OP_PUSHDATA4.
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case opcodeVal == 0x4e:
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data = bytes.Repeat(oneBytes, 3)
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expectedStr = strings.Repeat(oneStr, 3)
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// OP_1 through OP_16 display the numbers themselves.
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case opcodeVal >= 0x51 && opcodeVal <= 0x60:
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val := byte(opcodeVal - (0x51 - 1))
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data = []byte{val}
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expectedStr = strconv.Itoa(int(val))
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// OP_NOP1 through OP_NOP10.
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case opcodeVal >= 0xb0 && opcodeVal <= 0xb9:
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switch opcodeVal {
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case 0xb1:
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// OP_NOP2 is an alias of OP_CHECKLOCKTIMEVERIFY
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expectedStr = "OP_CHECKLOCKTIMEVERIFY"
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case 0xb2:
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// OP_NOP3 is an alias of OP_CHECKSEQUENCEVERIFY
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expectedStr = "OP_CHECKSEQUENCEVERIFY"
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default:
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val := byte(opcodeVal - (0xb0 - 1))
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expectedStr = "OP_NOP" + strconv.Itoa(int(val))
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}
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// OP_UNKNOWN#.
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case opcodeVal >= 0xba && opcodeVal <= 0xf9 || opcodeVal == 0xfc:
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expectedStr = "OP_UNKNOWN" + strconv.Itoa(int(opcodeVal))
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}
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pop := parsedOpcode{opcode: &opcodeArray[opcodeVal], data: data}
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gotStr := pop.print(true)
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if gotStr != expectedStr {
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t.Errorf("pop.print (opcode %x): Unexpected disasm "+
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"string - got %v, want %v", opcodeVal, gotStr,
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expectedStr)
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continue
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}
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}
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// Now, replace the relevant fields and test the full disassembly.
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expectedStrings[0x00] = "OP_0"
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expectedStrings[0x4f] = "OP_1NEGATE"
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for opcodeVal, expectedStr := range expectedStrings {
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var data []byte
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switch {
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// OP_DATA_1 through OP_DATA_65 display the opcode followed by
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// the pushed data.
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case opcodeVal >= 0x01 && opcodeVal < 0x4c:
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data = bytes.Repeat(oneBytes, opcodeVal)
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expectedStr = fmt.Sprintf("OP_DATA_%d 0x%s", opcodeVal,
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strings.Repeat(oneStr, opcodeVal))
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// OP_PUSHDATA1.
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case opcodeVal == 0x4c:
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data = bytes.Repeat(oneBytes, 1)
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expectedStr = fmt.Sprintf("OP_PUSHDATA1 0x%02x 0x%s",
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len(data), strings.Repeat(oneStr, 1))
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// OP_PUSHDATA2.
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case opcodeVal == 0x4d:
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data = bytes.Repeat(oneBytes, 2)
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expectedStr = fmt.Sprintf("OP_PUSHDATA2 0x%04x 0x%s",
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len(data), strings.Repeat(oneStr, 2))
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// OP_PUSHDATA4.
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case opcodeVal == 0x4e:
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data = bytes.Repeat(oneBytes, 3)
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expectedStr = fmt.Sprintf("OP_PUSHDATA4 0x%08x 0x%s",
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len(data), strings.Repeat(oneStr, 3))
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// OP_1 through OP_16.
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case opcodeVal >= 0x51 && opcodeVal <= 0x60:
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val := byte(opcodeVal - (0x51 - 1))
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data = []byte{val}
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expectedStr = "OP_" + strconv.Itoa(int(val))
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// OP_NOP1 through OP_NOP10.
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case opcodeVal >= 0xb0 && opcodeVal <= 0xb9:
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switch opcodeVal {
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case 0xb1:
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// OP_NOP2 is an alias of OP_CHECKLOCKTIMEVERIFY
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expectedStr = "OP_CHECKLOCKTIMEVERIFY"
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case 0xb2:
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// OP_NOP3 is an alias of OP_CHECKSEQUENCEVERIFY
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expectedStr = "OP_CHECKSEQUENCEVERIFY"
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default:
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val := byte(opcodeVal - (0xb0 - 1))
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expectedStr = "OP_NOP" + strconv.Itoa(int(val))
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}
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// OP_UNKNOWN#.
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case opcodeVal >= 0xba && opcodeVal <= 0xf9 || opcodeVal == 0xfc:
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expectedStr = "OP_UNKNOWN" + strconv.Itoa(int(opcodeVal))
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}
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pop := parsedOpcode{opcode: &opcodeArray[opcodeVal], data: data}
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gotStr := pop.print(false)
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if gotStr != expectedStr {
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t.Errorf("pop.print (opcode %x): Unexpected disasm "+
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"string - got %v, want %v", opcodeVal, gotStr,
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expectedStr)
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continue
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}
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}
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}
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