Iquidus Explorer - 1.6.2

Requirements for MYCE EXPLORER

• 2 GB RAM
• 50 GB DISK
• At least 1 Core
• 4 GB Flap Memory

Install Docker and docker compose

Create Unix user

SSH using root user, then create new user for the application

useradd -g users -s `which bash` -m app

Change user using

sudo usermod -a -G docker app
su - app

Clone explorer and checkout

git clone https://github.com/myceworld/explorer.git explorer
cd explorer

See it in action

docker pull bitcoinsfacildoc/explorer:1.0.0 .

Start database

docker-compose up --build -Vd db

Create database

Enter MongoDB container:

docker exec it explorer_db_1 bash

Enter MongoDB cli:

mongo

Create databse

use explorerdb

Create user with read/write access:

db.createUser( { user: "imAnTeRDaROmbEdmilEr2", pwd: "ioNcEpTieNipMAdsOlKH", roles: [ "readWrite" ] } )

Start services

docker-compose up --build -Vd nginx app
docker-compose up --build -Vd update peers

Server Reqs

• vCPU 2
• memory: 4GB
• disk: 35GB

An open source block explorer written in node.js.

See it in action

• Deutsche eMark
• Vertcoin
• TheHolyRogerCoin (ROGER) Explorer
• CPUChain (CPU) Explorer
• Omega Blockchain Explorer
• Sugarchain Explorer
• Florincoin
• Sphere
• Vertcoin
• Vivo
• Florincoin
• Maxcoin Explorer 1
• Maxcoin Explorer 2

Note: If you would like your instance mentioned here contact me

Requires

• node.js >= 0.10.28 (8.17.0 is advised for updated dependencies)
• mongodb 2.6.x
• *coind

Create database

Enter MongoDB cli:

$ mongo

Create databse:

> use explorerdb

Create user with read/write access:

> db.createUser( { user: "imAnTeRDaROmbEdmilEr2", pwd: "ioNcEpTieNipMAdsOlKH", roles: [ "readWrite" ] } )

*Note: If you're using mongo shell 2.4.x, use the following to create your user:

> db.addUser( { user: "username", pwd: "password", roles: [ "readWrite"] })

Get the source

git clone https://github.com/iquidus/explorer explorer

Install node modules

cd 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

As of version 1.4.0 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 explorers root directory.

Usage: node scripts/sync.js [database] [mode]

database: (required)
index [mode] Main index: coin info/stats, transactions & addresses
market       Market data: summaries, orderbooks, trade history & chartdata

mode: (required for index database only)
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.
* The market database only supports (& defaults to) reindex mode.
* 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 market data every 2 minutes

*/5 * * * * docker start explorer_peers_1

*/1 * * * * cd /path/to/explorer && /usr/bin/nodejs scripts/sync.js index update > /dev/null 2>&1
*/2 * * * * cd /path/to/explorer && /usr/bin/nodejs scripts/sync.js market > /dev/null 2>&1
*/5 * * * * cd /path/to/explorer && /usr/bin/nodejs scripts/peers.js > /dev/null 2>&1

Wallet

Iquidus Explorer is intended to be generic, so it can be used with any wallet following the usual standards. The wallet must be running with atleast 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 db_index.pid from the tmp folder in the explorer root directory.

rm tmp/index.pid
rm tmp/db_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

License

Copyright (c) 2015, Iquidus Technology
Copyright (c) 2015, Luke Williams
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of Iquidus Technology nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.