From a1facbe71f8ff3c5b50071cdb03be96dcdf72dec Mon Sep 17 00:00:00 2001
From: Robert Martin-Legene <robert@martin-legene.dk>
Date: Fri, 28 Aug 2020 05:24:58 -0300
Subject: [PATCH] Adding script to print events logged to the blockchain
---
bin/events.js | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 96 insertions(+)
create mode 100755 bin/events.js
diff --git a/bin/events.js b/bin/events.js
new file mode 100755
index 0000000..ffaf83c
--- /dev/null
+++ b/bin/events.js
@@ -0,0 +1,96 @@
+#!/usr/bin/node
+// 20200828 Robert Martin-Legene
+// License: GPLv2-only
+// (c) Secretaria Legal y Tecnica, Presidencia De La Nacion, Argentina
+
+// Looks for the contract you're specifying as argument.
+// Tries to show you all the events that contract has ever logged on the blockchain.
+// The contract's ABI must be in a text file in ${BFANETWORKDIR}/contracts/${contractaddr}/abi
+
+const Web3 = require( "web3" );
+const fs = require( "fs" );
+const web3 = new Web3( "http://127.0.0.1:8545" );
+
+function writeEvent(ev)
+{
+ console.log("");
+ console.log( "Block number: " + ev.blockNumber );
+ console.log( "TX hash: " + ev.transactionHash );
+ console.log( "Event name: " + ev.event );
+ Object.keys( ev.returnValues ).forEach(
+ function writeEventValue( value )
+ {
+ // Will skip keys which are made entirely of digits.
+ if ( ! value.match(/^[0-9]+$/) )
+ {
+ console.log( "* " + value + ": " + ev.returnValues[value] )
+ }
+ }
+ );
+}
+
+
+function gotPastEvents( e, result )
+{
+ // We are called a single time.
+ // Either success or failure.
+ if ( e )
+ {
+ console.error( e );
+ process.exit( 1 );
+ }
+ result.forEach( writeEvent );
+ console.log( "\n" + result.length + " events." );
+}
+
+var contractname = process.argv[2];
+if ( contractname === undefined )
+{
+ console.error( "Usage: " + process.argv[1] + " <contractname|contractaddr>" );
+ process.exit( 1 );
+}
+if ( process.env.BFANETWORKDIR === undefined )
+{
+ console.error( "$BFANETWORKDIR must be defined" );
+ process.exit( 1 );
+}
+var pathprefix = process.env.BFANETWORKDIR + "/contracts/";
+var filename;
+if ( fs.existsSync( contractname ))
+ filename = contractname;
+else
+if ( fs.existsSync( contractname.toLowerCase() ))
+ filename = contractname.toLowerCase();
+else
+if ( fs.existsSync( pathprefix + contractname ))
+ filename = pathprefix + contractname;
+else
+if ( fs.existsSync( pathprefix + contractname.toLowerCase() ))
+ filename = pathprefix + contractname.toLowerCase();
+if ( filename === undefined )
+{
+ console.error( "Contract not found." );
+ process.exit( 1 );
+}
+var contractaddr = filename;
+var dirname = "";
+var idx = filename.lastIndexOf("/");
+if ( idx > -1 )
+{
+ dirname = filename.substr( 0, idx+1 );
+ filename = filename.substr( idx+1 )
+ contractaddr = filename;
+}
+var stats = fs.lstatSync( dirname + filename );
+if ( stats.isSymbolicLink() )
+{
+ let linkname = fs.readlinkSync( dirname + filename, { encoding: 'utf8' } );
+ filename = dirname + linkname;
+ contractaddr = linkname;
+}
+filename += "/abi";
+var abi_str = fs.readFileSync( filename, { encoding: 'utf8' } );
+var abi = JSON.parse( abi_str );
+var contract = new web3.eth.Contract( abi, contractaddr );
+console.log( "Address: " + contractaddr );
+contract.getPastEvents( "allEvents", { fromBlock: "earliest", toBlock: "latest" }, gotPastEvents);
--
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