Cannasight API is an open-source Cannacoin blockchain REST and websocket API. Cannasight API runs in NodeJS and uses LevelDB for storage.
This is a backend-only service. If you're looking for a web frontend application, take a look at our official blockchain explorer Cannasight.
Cannasight API allows everyone to develop Cannacoin-related applications (such as wallets) that require certain information from the blockchain that cannacoind does not provide.
- cannacoind - Download and install Cannacoin.
Cannasight API needs a trusted cannacoind node to run. Cannasight API will connect to the node through the RPC API, Cannacoin peer-to-peer protocol, and will even read its raw block .dat files for syncing.
Configure cannacoind to listen to RPC calls and set txindex to true. cannacoind must be running and must have
finished downloading the blockchain before running Cannasight API.
-
Node.js v0.10.x - Download and Install Node.js.
-
NPM - Node.js package manager, should be automatically installed when you get Node.js.
Check the Prerequisites section above before installing.
To install Cannasight API, clone the main repository:
$ git clone https://github.com/cannacoin-project/cannasight-api.git && cd cannasight-api
Install dependencies:
$ npm install
Run the main application:
$ node insight.js
Then open a browser and go to:
http://localhost:3000
Please note that the app will need to sync its internal database with the blockchain state, which may take some time. You can check sync progress at http://localhost:3000/api/sync.
All configuration is specified in the config folder, particularly the config.js file. There you can specify your application name and database name. Certain configuration values are pulled from environment variables if they are defined:
BITCOIND_HOST # RPC cannacoind host
BITCOIND_PORT # RPC cannacoind Port
BITCOIND_P2P_HOST # P2P cannacoind Host (will default to BITCOIND_HOST, if specified)
BITCOIND_P2P_PORT # P2P cannacoind Port
BITCOIND_USER # RPC username
BITCOIND_PASS # RPC password
BITCOIND_DATADIR # cannacoind datadir. 'testnet' will be appended automatically if testnet is used. NEED to finish with '/'. e.g: `/vol/data/`
INSIGHT_NETWORK [= 'livenet' | 'testnet']
INSIGHT_PORT # insight api port
INSIGHT_DB # Path where to store the internal DB. (defaults to $HOME/.cannasight)
INSIGHT_SAFE_CONFIRMATIONS=6 # Nr. of confirmation needed to start caching transaction information
INSIGHT_IGNORE_CACHE # True to ignore cache of spents in transaction, with more than INSIGHT_SAFE_CONFIRMATIONS confirmations. This is useful for tracking double spents for old transactions.
ENABLE_MAILBOX # if "true" will enable mailbox plugin
ENABLE_CLEANER # if "true" will enable message db cleaner plugin
ENABLE_MONITOR # if "true" will enable message db monitor plugin
ENABLE_EMAILSTORE # if "true" will enable a plugin to store data with a validated email address
ENABLE_RATELIMITER # if "true" will enable the ratelimiter plugin
LOGGER_LEVEL # defaults to 'info', can be 'debug','verbose','error', etc.
ENABLE_HTTPS # if "true" it will server using SSL/HTTPS
Make sure that cannacoind is configured to accept incoming connections using 'rpcallowip'.
In case the network is changed (testnet to livenet or vice versa) levelDB database needs to be deleted. This can be performed running:
util/sync.js -D and waiting for Cannasight API to synchronize again. Once the database is deleted,
the sync.js process can be safely interrupted (CTRL+C) and continued from the synchronization process embedded in main app.
The initial synchronization process scans the blockchain from the paired cannacoind server to update addresses and balances. cannasight-api needs exactly one trusted cannacoind node to run. This node must have finished downloading the blockchain before running cannasight-api.
While cannasight-api is synchronizing the website can be accessed (the sync process is embedded in the webserver),
but there may be missing data or incorrect balances for addresses. The 'sync' status is shown at the /api/sync endpoint.
The blockchain can be read from cannacoind's raw .dat files or RPC interface.
Reading the information from the .dat files is much faster so it's the
recommended (and default) alternative. .dat files are scanned in the default
location for each platform (for example, ~/.cannacoin on Linux). In case a
non-standard location is used, it needs to be defined (see the Configuration section).
While synchronizing the blockchain, cannasight-api listens for new blocks and
transactions relayed by the cannacoind node. Those are also stored on cannasight-api's database.
In case cannasight-api is shutdown for a period of time, restarting it will trigger
a partial (historic) synchronization of the blockchain. Depending on the size of
that synchronization task, a reverse RPC or forward .dat syncing strategy will be used.
If cannacoind is shutdown, cannasight-api needs to be stopped and restarted once cannacoind is restarted.
Old blockchain data can be manually synced issuing:
$ util/sync.js
Check util/sync.js --help for options, particularly -D to erase the current DB.
NOTE: there is no need to run this manually since the historic synchronization is built in into the web application. Running cannasight-api normally will trigger the historic sync automatically.
To store the blockchain and address related information, cannasight-api uses LevelDB. Two DBs are created: txs and blocks. By default these are stored on
~/.cannsight/
This can be changed at config/config.js.
To run cannasight-api locally for development with grunt:
$ NODE_ENV=development grunt
To run the tests
$ grunt test
Contributions and suggestions are welcome at cannasight-api github repository.
Since v0.2 a new cache schema has been introduced. Only information from transactions with INSIGHT_SAFE_CONFIRMATIONS settings will be cached (by default SAFE_CONFIRMATIONS=6). There are 3 different caches:
- Number of confirmations
- Transaction output spent/unspent status
- scriptPubKey for unspent transactions
Cache data is only populated on request, i.e., only after accessing the required data for
the first time, the information is cached, there is not pre-caching procedure. To ignore
cache by default, use INSIGHT_IGNORE_CACHE. Also, address related calls support ?noCache=1
to ignore the cache in a particular API request.
By default, cannasight-api provides a REST API at /api, but this prefix is configurable from the var apiPrefix in the config.js file.
The end-points are:
/api/block/[:hash]
/api/block/00000000a967199a2fad0877433c93df785a8d8ce062e5f9b451cd1397bdbf62
/api/tx/[:txid]
/api/tx/525de308971eabd941b139f46c7198b5af9479325c2395db7f2fb5ae8562556c
/api/addr/[:addr][?noTxList=1&noCache=1]
/api/addr/mmvP3mTe53qxHdPqXEvdu8WdC7GfQ2vmx5?noTxList=1
/api/addr/[:addr]/balance
/api/addr/[:addr]/totalReceived
/api/addr/[:addr]/totalSent
/api/addr/[:addr]/unconfirmedBalance
The response contains the value in Satoshis.
/api/addr/[:addr]/utxo[?noCache=1]
Sample return:
[
{
address: "n2PuaAguxZqLddRbTnAoAuwKYgN2w2hZk7",
txid: "dbfdc2a0d22a8282c4e7be0452d595695f3a39173bed4f48e590877382b112fc",
vout: 0,
ts: 1401276201,
scriptPubKey: "76a914e50575162795cd77366fb80d728e3216bd52deac88ac",
amount: 0.001,
confirmations: 3
},
{
address: "n2PuaAguxZqLddRbTnAoAuwKYgN2w2hZk7",
txid: "e2b82af55d64f12fd0dd075d0922ee7d6a300f58fe60a23cbb5831b31d1d58b4",
vout: 0,
ts: 1401226410,
scriptPubKey: "76a914e50575162795cd77366fb80d728e3216bd52deac88ac",
amount: 0.001,
confirmation: 6
confirmationsFromCache: true,
}
]Please note that in case confirmations are cached (which happens by default when the number of confirmations is bigger that INSIGHT_SAFE_CONFIRMATIONS) the response will include the pair confirmationsFromCache:true, and confirmations will equal INSIGHT_SAFE_CONFIRMATIONS. See noCache and INSIGHT_IGNORE_CACHE options for details.
GET method:
/api/addrs/[:addrs]/utxo
/api/addrs/2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f/utxo
POST method:
/api/addrs/utxo
POST params:
addrs: 2NF2baYuJAkCKo5onjUKEPdARQkZ6SYyKd5,2NAre8sX2povnjy4aeiHKeEh97Qhn97tB1f
/api/txs/?block=HASH
/api/txs/?block=00000000fa6cf7367e50ad14eb0ca4737131f256fc4c5841fd3c3f140140e6b6
/api/txs/?address=ADDR
/api/txs/?address=mmhmMNfBiZZ37g1tgg2t8DDbNoEdqKVxAL
POST method:
/api/tx/send
POST params:
rawtx: "signed transaction as hex string"
eg
rawtx: 01000000017b1eabe0209b1fe794124575ef807057c77ada2138ae4fa8d6c4de0398a14f3f00000000494830450221008949f0cb400094ad2b5eb399d59d01c14d73d8fe6e96df1a7150deb388ab8935022079656090d7f6bac4c9a94e0aad311a4268e082a725f8aeae0573fb12ff866a5f01ffffffff01f0ca052a010000001976a914cbc20a7664f2f69e5355aa427045bc15e7c6c77288ac00000000
POST response:
{
txid: [:txid]
}
eg
{
txid: "c7736a0a0046d5a8cc61c8c3c2821d4d7517f5de2bc66a966011aaa79965ffba"
}
/api/sync
/api/peer
/api/status?q=xxx
Where "xxx" can be:
- getInfo
- getDifficulty
- getTxOutSetInfo
- getBestBlockHash
- getLastBlockHash
The web socket API is served using socket.io.
The following are the events published by Cannasight API:
'tx': new transaction received from network. This event is published in the 'inv' room. Data will be a app/models/Transaction object. Sample output:
{
"txid":"00c1b1acb310b87085c7deaaeba478cef5dc9519fab87a4d943ecbb39bd5b053",
"processed":false
...
}
'block': new block received from network. This event is published in the 'inv' room. Data will be a app/models/Block object. Sample output:
{
"hash":"000000004a3d187c430cd6a5e988aca3b19e1f1d1727a50dead6c8ac26899b96",
"time":1389789343,
...
}
'': new transaction concerning received from network. This event is published in the '' room.
'status': every 1% increment on the sync task, this event will be triggered. This event is published in the 'sync' room.
Sample output:
{
blocksToSync: 164141,
syncedBlocks: 475,
upToExisting: true,
scanningBackward: true,
isEndGenesis: true,
end: "000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943",
isStartGenesis: false,
start: "000000009f929800556a8f3cfdbe57c187f2f679e351b12f7011bfc276c41b6d"
}
The following html page connects to the socket.io Cannasight API and listens for new transactions.
html
<html>
<body>
<script src="http://explorer.cannapay.io/socket.io/socket.io.js"></script>
<script>
eventToListenTo = 'tx'
room = 'inv'
var socket = io("http://live.cannacoin.cc/");
socket.on('connect', function() {
// Join the room.
socket.emit('subscribe', room);
})
socket.on(eventToListenTo, function(data) {
console.log("New transaction received: " + data.txid)
})
</script>
</body>
</html>
(The MIT License)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.