python
$ git clone https://github.com/ethereum/pyethereum
Cloning into 'pyethereum'...
remote: Counting objects: 12773, done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 12773 (delta 0), reused 0 (delta 0), pack-reused 12761
Receiving objects: 100% (12773/12773), 4.48 MiB | 48.00 KiB/s, done.
Resolving deltas: 100% (9465/9465), done.
Checking connectivity... done.
$ cd pyethereum/
$ git checkout develop
Already on 'develop'
Your branch is up-to-date with 'origin/develop'.
$ pip install -r requirements.txt
Collecting https://github.com/ethereum/ethash/tarball/master (from -r requirements.txt (line 9))
Downloading https://github.com/ethereum/ethash/tarball/master
- 92kB 89kB/s
：
：
Running setup.py install for pyethash ... done
Successfully installed bitcoin-1.1.42 pbkdf2-1.3 pycryptodome-3.4 pyethash-0.1.23 pysha3-0.3 repoze.lru-0.6 rlp-0.4.6 scrypt-0.7.1 secp256k1-0.13.2
$ pythin setup.py install
Installed /private/var/folders/53/svs5z_nd1b98rlwp_nn5ybk80000gn/T/easy_install-chm3e1an/pytest-runner-2.7/.eggs/setuptools_scm-1.11.1-py3.5.egg
zip_safe flag not set; analyzing archive contents...
packages
Finished processing dependencies for ethereum==1.5.2
python
$ git clone https://github.com/ethereum/serpent.git
Cloning into 'serpent'...
remote: Counting objects: 2053, done.
remote: Total 2053 (delta 0), reused 0 (delta 0), pack-reused 2053
Receiving objects: 100% (2053/2053), 3.38 MiB | 82.00 KiB/s, done.
Resolving deltas: 100% (1327/1327), done.
Checking connectivity... done.
$ cd serpent
$ git checkout develop
Branch develop set up to track remote branch develop from origin.
Switched to a new branch 'develop'
$ make && sudo make install
c++ -fPIC -Wno-sign-compare -c -o keccak-tiny.o keccak-tiny.cpp
c++ -fPIC -Wno-sign-compare -c -o bignum.o bignum.cpp
：
：
Installed /Users/abenben/.pyenv/versions/anaconda-2.2.0/lib/python2.7/site-packages/ethereum_serpent-2.0.2-py2.7-macosx-10.6-x86_64.egg
Processing dependencies for ethereum-serpent==2.0.2
Finished processing dependencies for ethereum-serpent==2.0.2
Essayez de déplacer certains des échantillons dans les emplacements suivants https://github.com/ethereum/wiki/wiki/Serpent
D'autres échantillons sont disponibles aux endroits suivants https://github.com/ethereum/serpent/tree/master/examples
Tout d'abord, préparez une implémentation simple de serpent
mul2.se
def double(x):
return(x * 2)
compiler
python
$ serpent compile mul2.se
604380600b600039604e567c010000000000000000000000000000000000000000000000000000000060003504636ffa1caa81141560415760043560405260026040510260605260206060f35b505b6000f3
Compiler (pretty_compile)
python
$ serpent pretty_compile mul2.se
[PUSH1, 67, DUP1, PUSH1, 11, PUSH1, 0, CODECOPY,
PUSH1, 78, JUMP, PUSH29, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, PUSH1, 0,
CALLDATALOAD, DIV, PUSH4, 111, 250, 28, 170, DUP2, EQ, ISZERO,
PUSH1, 65, JUMPI, PUSH1, 4, CALLDATALOAD, PUSH1, 64, MSTORE,
PUSH1, 2, PUSH1, 64, MLOAD, MUL, PUSH1, 96, MSTORE, PUSH1, 32,
PUSH1, 96, RETURN, JUMPDEST, POP, JUMPDEST, PUSH1, 0, RETURN]
Convertir au format LLL (LISP?)
python
$ serpent compile_to_lll mul2.se
(return 0
(lll
(with '__funid
(div (calldataload 0)
26959946667150639794667015087019630673637144422540572481103610249216
)
(unless (iszero (eq (get '__funid) 1878662314))
(seq
(set 'x (calldataload 4))
(seq
(set '_temp_521 (mul (get 'x) 2))
(return (ref '_temp_521) 32)
)
)
)
)
0
)
)
Essayez d'exécuter l'exemple de contrat intelligent à partir de Python
$ ipython
In [1]: from ethereum import tester as t
In [2]: s = t.state()
In [3]: c = s.abi_contract('mul2.se')
In [4]: c.double(42)
Out[4]: 84
In [5]:
Vérifiez la définition de la fonction
python
$ serpent mk_signature mul2.se
extern mul2.se: [double:[int256]:int256]
Préparez un autre échantillon Il s'agit d'une implémentation qui gère les valeurs de valeurs clés. Les services qui gèrent des domaines comme NameCoin sont susceptibles d'être réalisés avec des contrats intelligents.
namecoin.se
def register(key, value):
# Key not yet claimed
if not self.storage[key]:
self.storage[key] = value
return(1)
else:
return(0) # Key already claimed
def ask(key):
return(self.storage[key])
Essayez de courir à partir de Python
$ ipython
In [1]: from ethereum import tester as t
In [2]: s = t.state()
In [3]: c = s.abi_contract('namecoin.se')
In [4]: c.register(0x67656f726765, 45)
Out[4]: 1
In [5]: c.register(0x67656f726765, 20)
Out[5]: 0
In [6]: c.register(0x6861727279, 65)
Out[6]: 1
In [7]: c.ask(0x6861727279)
Out[7]: 65
C'est vraiment juste une touche pour créer une chance.
Il existe également un didacticiel ici, alors essayez différentes choses. http://mc2-umd.github.io/ethereumlab/docs/serpent_tutorial.pdf
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