ffa6fb9e9d
This converts the GetSigOpCount function to make use of the new tokenizer instead of the far less efficient parseScript thereby significantly optimizing the function. A new function named countSigOpsV0 which accepts the raw script is introduced to perform the bulk of the work so it can be reused for precise signature operation counting as well in a later commit. It retains the same semantics in terms of counting the number of signature operations either up to the first parse error or the end of the script in the case it parses successfully as required by consensus. Finally, this also deprecates the getSigOpCount function that requires opcodes in favor of the new function and modifies the comment on GetSigOpCount to explicitly call out the script version semantics. The following is a before and after comparison of analyzing a large script: benchmark old ns/op new ns/op delta ----------------------------------------------------------- BenchmarkGetSigOpCount 163896 1048 -99.36% benchmark old allocs new allocs delta ----------------------------------------------------------- BenchmarkGetSigOpCount 1 0 -100.00% benchmark old bytes new bytes delta ----------------------------------------------------------- BenchmarkGetSigOpCount 466945 0 -100.00% |
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|---|---|---|
| .. | ||
| data | ||
| bench_test.go | ||
| consensus_test.go | ||
| consensus.go | ||
| doc.go | ||
| engine_test.go | ||
| engine.go | ||
| error_test.go | ||
| error.go | ||
| example_test.go | ||
| go.mod | ||
| go.sum | ||
| log.go | ||
| opcode_test.go | ||
| opcode.go | ||
| README.md | ||
| reference_test.go | ||
| script_test.go | ||
| script.go | ||
| scriptbuilder_test.go | ||
| scriptbuilder.go | ||
| scriptnum_test.go | ||
| scriptnum.go | ||
| sigcache_test.go | ||
| sigcache.go | ||
| sighash_test.go | ||
| sighash.go | ||
| sign_test.go | ||
| sign.go | ||
| stack_test.go | ||
| stack.go | ||
| standard_test.go | ||
| standard.go | ||
| tokenizer_test.go | ||
| tokenizer.go | ||
txscript
Package txscript implements the Decred transaction script language. There is a comprehensive test suite.
This package has intentionally been designed so it can be used as a standalone package for any projects needing to use or validate Decred transaction scripts.
Decred Scripts
Decred provides a stack-based, FORTH-like language for the scripts in the Decred transactions. This language is not turing complete although it is still fairly powerful.
Installation and Updating
$ go get -u github.com/decred/dcrd/txscript
Examples
-
Standard Pay-to-pubkey-hash Script
Demonstrates creating a script which pays to a Decred address. It also prints the created script hex and uses the DisasmString function to display the disassembled script. -
Extracting Details from Standard Scripts
Demonstrates extracting information from a standard public key script. -
Manually Signing a Transaction Output
Demonstrates manually creating and signing a redeem transaction. -
Counting Opcodes in Scripts
Demonstrates creating a script tokenizer instance and using it to count the number of opcodes a script contains.
License
Package txscript is licensed under the copyfree ISC License.