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<a href="blocktools_8py.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"><a class="line" href="namespacetest__framework_1_1blocktools.html"> 1</a></span> <span class="comment"># blocktools.py - utilities for manipulating blocks and transactions</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">#</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"># Distributed under the MIT/X11 software license, see the accompanying</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"># file COPYING or http://www.opensource.org/licenses/mit-license.php.</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">#</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="keyword">from</span> .mininode <span class="keyword">import</span> *</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="keyword">from</span> .script <span class="keyword">import</span> CScript, OP_TRUE, OP_CHECKSIG</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"># Create a block (with regtest difficulty)</span></div><div class="line"><a name="l00011"></a><span class="lineno"><a class="line" href="namespacetest__framework_1_1blocktools.html#ab3c34a7489e18f5a954a59b06dfcd341"> 11</a></span> <span class="keyword">def </span><a class="code" href="namespacetest__framework_1_1blocktools.html#ab3c34a7489e18f5a954a59b06dfcd341">create_block</a>(hashprev, coinbase, nTime=None):</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  block = <a class="code" href="classtest__framework_1_1mininode_1_1CBlock.html">CBlock</a>()</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  <span class="keywordflow">if</span> nTime <span class="keywordflow">is</span> <span class="keywordtype">None</span>:</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  <span class="keyword">import</span> time</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  block.nTime = int(time.time()+600)</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keywordflow">else</span>:</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  block.nTime = nTime</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  block.hashPrevBlock = hashprev</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  block.nBits = 0x207fffff <span class="comment"># Will break after a difficulty adjustment...</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  block.vtx.append(coinbase)</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  block.hashMerkleRoot = block.calc_merkle_root()</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  block.calc_sha256()</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> block</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="namespacetest__framework_1_1blocktools.html#a73d94882951eb5adeb3b78264a48e389"> 25</a></span> <span class="keyword">def </span><a class="code" href="namespacetest__framework_1_1blocktools.html#a73d94882951eb5adeb3b78264a48e389">serialize_script_num</a>(value):</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  r = bytearray(0)</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">if</span> value == 0:</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">return</span> r</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  neg = value < 0</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  absvalue = -value <span class="keywordflow">if</span> neg <span class="keywordflow">else</span> value</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">while</span> (absvalue):</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  r.append(int(absvalue & 0xff))</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  absvalue >>= 8</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> r[-1] & 0x80:</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  r.append(0x80 <span class="keywordflow">if</span> neg <span class="keywordflow">else</span> 0)</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">elif</span> neg:</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  r[-1] |= 0x80</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">return</span> r</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"># Create a coinbase transaction, assuming no miner fees.</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"># If pubkey is passed in, the coinbase output will be a P2PK output;</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"># otherwise an anyone-can-spend output.</span></div><div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="namespacetest__framework_1_1blocktools.html#a3fcec92180100b1dcfd1d0f751561081"> 43</a></span> <span class="keyword">def </span><a class="code" href="namespacetest__framework_1_1blocktools.html#a3fcec92180100b1dcfd1d0f751561081">create_coinbase</a>(height, pubkey = None):</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  coinbase = <a class="code" href="classtest__framework_1_1mininode_1_1CTransaction.html">CTransaction</a>()</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  coinbase.vin.append(<a class="code" href="classtest__framework_1_1mininode_1_1CTxIn.html">CTxIn</a>(<a class="code" href="classtest__framework_1_1mininode_1_1COutPoint.html">COutPoint</a>(0, 0xffffffff), </div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <a class="code" href="namespacetest__framework_1_1mininode.html#a0d10ddcce8c03b9a96ba703e59bd8ee7">ser_string</a>(<a class="code" href="namespacetest__framework_1_1blocktools.html#a73d94882951eb5adeb3b78264a48e389">serialize_script_num</a>(height)), 0xffffffff))</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  coinbaseoutput = <a class="code" href="classtest__framework_1_1mininode_1_1CTxOut.html">CTxOut</a>()</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  coinbaseoutput.nValue = 500 * COIN</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  halvings = int(height/150) <span class="comment"># regtest</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  coinbaseoutput.nValue >>= halvings</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">if</span> (pubkey != <span class="keywordtype">None</span>):</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  coinbaseoutput.scriptPubKey = <a class="code" href="classtest__framework_1_1script_1_1CScript.html">CScript</a>([pubkey, OP_CHECKSIG])</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">else</span>:</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  coinbaseoutput.scriptPubKey = <a class="code" href="classtest__framework_1_1script_1_1CScript.html">CScript</a>([OP_TRUE])</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  coinbase.vout = [ coinbaseoutput ]</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  coinbase.calc_sha256()</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> coinbase</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"># Create a transaction with an anyone-can-spend output, that spends the</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"># nth output of prevtx.</span></div><div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="namespacetest__framework_1_1blocktools.html#ab96dd3d2ebdca9fe7b22d673a53ac05b"> 61</a></span> <span class="keyword">def </span><a class="code" href="namespacetest__framework_1_1blocktools.html#ab96dd3d2ebdca9fe7b22d673a53ac05b">create_transaction</a>(prevtx, n, sig, value):</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  tx = <a class="code" href="classtest__framework_1_1mininode_1_1CTransaction.html">CTransaction</a>()</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  assert(n < len(prevtx.vout))</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  tx.vin.append(<a class="code" href="classtest__framework_1_1mininode_1_1CTxIn.html">CTxIn</a>(<a class="code" href="classtest__framework_1_1mininode_1_1COutPoint.html">COutPoint</a>(prevtx.sha256, n), sig, 0xffffffff))</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  tx.vout.append(<a class="code" href="classtest__framework_1_1mininode_1_1CTxOut.html">CTxOut</a>(value, b<span class="stringliteral">""</span>))</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  tx.calc_sha256()</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span> tx</div><div class="ttc" id="namespacetest__framework_1_1blocktools_html_a73d94882951eb5adeb3b78264a48e389"><div class="ttname"><a href="namespacetest__framework_1_1blocktools.html#a73d94882951eb5adeb3b78264a48e389">test_framework.blocktools.serialize_script_num</a></div><div class="ttdeci">def serialize_script_num(value)</div><div class="ttdef"><b>Definition:</b> <a href="blocktools_8py_source.html#l00025">blocktools.py:25</a></div></div>
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<div class="ttc" id="namespacetest__framework_1_1blocktools_html_ab3c34a7489e18f5a954a59b06dfcd341"><div class="ttname"><a href="namespacetest__framework_1_1blocktools.html#ab3c34a7489e18f5a954a59b06dfcd341">test_framework.blocktools.create_block</a></div><div class="ttdeci">def create_block(hashprev, coinbase, nTime=None)</div><div class="ttdef"><b>Definition:</b> <a href="blocktools_8py_source.html#l00011">blocktools.py:11</a></div></div>
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<div class="ttc" id="classtest__framework_1_1script_1_1CScript_html"><div class="ttname"><a href="classtest__framework_1_1script_1_1CScript.html">test_framework.script.CScript</a></div><div class="ttdef"><b>Definition:</b> <a href="script_8py_source.html#l00641">script.py:641</a></div></div>
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<div class="ttc" id="classtest__framework_1_1mininode_1_1COutPoint_html"><div class="ttname"><a href="classtest__framework_1_1mininode_1_1COutPoint.html">test_framework.mininode.COutPoint</a></div><div class="ttdef"><b>Definition:</b> <a href="mininode_8py_source.html#l00323">mininode.py:323</a></div></div>
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<div class="ttc" id="namespacetest__framework_1_1mininode_html_a0d10ddcce8c03b9a96ba703e59bd8ee7"><div class="ttname"><a href="namespacetest__framework_1_1mininode.html#a0d10ddcce8c03b9a96ba703e59bd8ee7">test_framework.mininode.ser_string</a></div><div class="ttdeci">def ser_string(s)</div><div class="ttdef"><b>Definition:</b> <a href="mininode_8py_source.html#l00081">mininode.py:81</a></div></div>
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<div class="ttc" id="namespacetest__framework_1_1blocktools_html_a3fcec92180100b1dcfd1d0f751561081"><div class="ttname"><a href="namespacetest__framework_1_1blocktools.html#a3fcec92180100b1dcfd1d0f751561081">test_framework.blocktools.create_coinbase</a></div><div class="ttdeci">def create_coinbase(height, pubkey=None)</div><div class="ttdef"><b>Definition:</b> <a href="blocktools_8py_source.html#l00043">blocktools.py:43</a></div></div>
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<div class="ttc" id="namespacetest__framework_1_1blocktools_html_ab96dd3d2ebdca9fe7b22d673a53ac05b"><div class="ttname"><a href="namespacetest__framework_1_1blocktools.html#ab96dd3d2ebdca9fe7b22d673a53ac05b">test_framework.blocktools.create_transaction</a></div><div class="ttdeci">def create_transaction(prevtx, n, sig, value)</div><div class="ttdef"><b>Definition:</b> <a href="blocktools_8py_source.html#l00061">blocktools.py:61</a></div></div>
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<div class="ttc" id="classtest__framework_1_1mininode_1_1CTxIn_html"><div class="ttname"><a href="classtest__framework_1_1mininode_1_1CTxIn.html">test_framework.mininode.CTxIn</a></div><div class="ttdef"><b>Definition:</b> <a href="mininode_8py_source.html#l00342">mininode.py:342</a></div></div>
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<div class="ttc" id="classtest__framework_1_1mininode_1_1CTransaction_html"><div class="ttname"><a href="classtest__framework_1_1mininode_1_1CTransaction.html">test_framework.mininode.CTransaction</a></div><div class="ttdef"><b>Definition:</b> <a href="mininode_8py_source.html#l00391">mininode.py:391</a></div></div>
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<div class="ttc" id="classtest__framework_1_1mininode_1_1CTxOut_html"><div class="ttname"><a href="classtest__framework_1_1mininode_1_1CTxOut.html">test_framework.mininode.CTxOut</a></div><div class="ttdef"><b>Definition:</b> <a href="mininode_8py_source.html#l00370">mininode.py:370</a></div></div>
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<div class="ttc" id="classtest__framework_1_1mininode_1_1CBlock_html"><div class="ttname"><a href="classtest__framework_1_1mininode_1_1CBlock.html">test_framework.mininode.CBlock</a></div><div class="ttdef"><b>Definition:</b> <a href="mininode_8py_source.html#l00513">mininode.py:513</a></div></div>
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