GEEK Explorer – 0.9.0
An open source block explorer written in node.js originally forked from iquidus explorer.
See it in action
Requires
- node.js >= 8.17.0 (12.14.0 is advised for updated dependencies)
- mongodb 4.2.x
- geekcashd
Create database
Enter MongoDB cli:
$ mongo
Create databse:
> use explorerdb
Create user with read/write access:
> db.createUser( { user: "geek", pwd: "explorer", roles: [ "readWrite" ] } )
Note: If you’re using mongo shell 4.2.x, use the following to create your user:
> db.addUser( { user: "geek", pwd: "explorer", roles: [ "readWrite"] })
Get the source
git clone https://github.com/blazegeek/geek-explorer geek-explorer
Install node modules
cd geek-explorer && npm install --production
Configure
cp ./settings.json.template ./settings.json
Make required changes in settings.json
Start Explorer
npm start
Note: mongod must be running to start the explorer
The explorer defaults to cluster mode, forking an instance of its process to each cpu core. This results in increased performance and stability. Load balancing gets automatically taken care of and any instances that for some reason die, will be restarted automatically. For testing/development (or if you just wish to) a single instance can be launched with
node --stack-size=10000 bin/instance
To stop the cluster you can use
npm stop
Syncing databases with the blockchain
sync.js (located in scripts/) is used for updating the local databases. This script must be called from the explorer’s root directory.
Usage: node scripts/sync.js index [mode]
mode: (required)
update Updates index from last sync to current block
check checks index for (and adds) any missing transactions/addresses
reindex Clears index then resyncs from genesis to current block
notes:
* 'current block' is the latest created block when script is executed.
* If check mode finds missing data (ignoring new data since last sync),
index_timeout in settings.json is set too low.
It is recommended to have this script launched via a cronjob at 1+ min intervals.
Crontab
Example crontab; update index every minute and peer data every 5 minutes
*/1 * * * * cd /path/to/geek-explorer && /usr/bin/nodejs scripts/sync.js index update > /dev/null 2>&1
*/5 * * * * cd /path/to/geek-explorer && /usr/bin/nodejs scripts/peers.js > /dev/null 2>&1
Wallet
The GeekCash wallet must be running with at least the following flags:
-daemon -txindex
Security
Ensure mongodb is not exposed to the outside world via your mongo config or a firewall to prevent outside tampering of the indexed chain data.
Known Issues
script is already running.
If you receive this message when launching the sync script either: a) a sync is currently in progress; or b) a previous sync was killed before it completed. If you are certian a sync is not in progress remove the index.pid and from the tmp folder in the explorer root directory.
rm tmp/index.pid
exceeding stack size
RangeError: Maximum call stack size exceeded
Nodes default stack size may be too small to index addresses with many tx’s. If you experience the above error while running sync.js the stack size needs to be increased.
To determine the default setting run
node --v8-options | grep -B0 -A1 stack-size
To run sync.js with a larger stack size launch with
node --stack-size=[SIZE] scripts/sync.js index update
Where [SIZE] is an integer higher than the default.
note: SIZE will depend on which blockchain you are using, you may need to play around a bit to find an optimal setting
