API for Abelian Core

1. Overview

abec provides a JSON-RPC API. There are some features in abec how RPCs are serviced:

abec is secure by default which means that the RPC connection is TLS-enabled by default
abec provides access to the API through both HTTP POST requests and Websockets

Websockets are the preferred transport for abec RPC and are used by applications such as abewallet for inter-process communication with abec. The websocket connection endpoint for abec is wss://your_ip_or_domain:8667/ws.

In addition to the standard API, an extension API is developping that is exclusive to clients using Websockets. In its current state, this API attempts to cover features found missing in the standard API during the development of abewallet.

It should be pointed out that the current API list is not stable, while the standard API is designed as stable, the Websocket extension API should be considered a work in progress, incomplete, and susceptible to changes (both additions and removals).

2. HTTP POST Versus Websockets

The abec RPC server supports both HTTP POST requests and the preferred Websockets. All of the standard and extension methods described in this documentation can be accessed through both. As the name indicates, the Websocket-specific extension methods can only be accessed when connected via Websockets.

As mentioned in the overview, the websocket connection endpoint for abec is wss://your_ip_or_domain:8667/ws.

The most important differences between the two transports as it pertains to the JSON-RPC API are:

	HTTP POST Requests	Websockets
Allows multiple requests across a single connection	No	Yes
Supports asynchronous notifications	No	Yes
Scales well with large numbers of requests	No	Yes

3. Authentication

3.1 Authentication Overview

The following authentication details are needed before establishing a connection to a abec RPC server:

rpcuser is the full-access username configured for the abec RPC server
rpcpass is the full-access password configured for the abec RPC server
rpclimituser is the limited username configured for the abec RPC server
rpclimitpass is the limited password configured for the abec RPC server
rpccert is the PEM-encoded X.509 certificate (public key) that the abec
server is configured with. It is automatically generated by abec and placed in the abec home directory (which is typically %LOCALAPPDATA%\abed on Windows and ~/.abec on POSIX-like OSes)

NOTE: As mentioned above, abec is secure by default which means the RPC server is not running unless configured with a rpcuser and rpcpass and/or a rpclimituser and rpclimitpass, and uses TLS authentication for all connections.

Depending on which connection transaction you are using, you can choose one of two, mutually exclusive, methods.

Use HTTP Authorization Header - HTTP POST requests and Websockets
Use the JSON-RPC "authenticate" command - Websockets only

3.2 HTTP Basic Access Authentication

The abec RPC server uses HTTP basic access authentication with the rpcuser and rpcpass detailed above. If the supplied credentials are invalid, you will be disconnected immediately upon making the connection.

3.3 JSON-RPC Authenticate Command (Websocket-specific)

While the HTTP basic access authentication method is the preferred method, the ability to set HTTP headers from websockets is not always available. In that case, you will need to use the authenticate JSON-RPC method.

The authenticate command must be the first command sent after connecting to the websocket. Sending any other commands before authenticating, supplying invalid credentials, or attempting to authenticate again when already authenticated will cause the websocket to be closed immediately.

4. Command-line Utility

abec comes with a separate utility named abectl which can be used to issue these RPC commands via HTTP POST requests to abec after configuring it with the information in the Authentication section above.

5. Standard Methods

5.1 Method Overview

The following is an overview of the RPC methods and their current status. Click the method name for further details such as parameter and return information.

#	Method	Safe for limited user?	Description
1	getbestblockhash	Y	Returns the hash of the of the best (most recent) block in the longest blockchain.
2	getblockabe	Y	Returns information about a block given its hash.
3	getblockcount	Y	Returns the number of blocks in the longest block chain.
4	getblockhash	Y	Returns hash of the block in best block chain at the given height.
5	getblockheader	Y	Returns the block header of the block.
6	getconnectioncount	N	Returns the number of active connections to other peers.
7	getdifficulty	Y	Returns the proof-of-work difficulty as a multiple of the minimum difficulty.
8	getgenerate	N	Return if the server is set to generate coins (mine) or not.
9	gethashespersec	N	Returns a recent hashes per second performance measurement while generating coins (mining).
10	getinfo	Y	Returns a JSON object containing various state info.
11	getnetworkhashps	Y	Returns the estimated network hashes per second for the block heights provided by the parameters.
12	getrawtransaction	Y	Returns information about a transaction given its hash.
13	help	Y	Returns a list of all commands or help for a specified command.
14	ping	N	Queues a ping to be sent to each connected peer.
15	setgenerate	N	Set the server to generate coins (mine) or not. NOTE: Since abedabec does not have the wallet integrated to provide payment addresses, abedabec must be configured via the `--miningaddr` option to provide which payment addresses to pay created blocks to for this RPC to function.
16	stop	N	Shutdown abec.

5.2 Method Details


Method	getbestblockhash
Parameters	None
Description	Returns the hash of the of the best (most recent) block in the longest block chain.
Returns	string
Example Return	`0000000000000001f356adc6b29ab42b59f913a396e170f80190dba615bd1e60`


Method	getblockabe
Parameters	1. block hash (string, required) - the hash of the block 2. verbosity (int, optional, default=1) - Specifies whether the block data should be returned as a hex-encoded string (0), as parsed data with a slice of TXIDs (1), or as parsed data with parsed transaction data (2).
Description	Returns information about a block given its hash.
Returns (verbosity=0)	`"data" (string) hex-encoded bytes of the serialized block`
Returns (verbosity=1)	`{ (json object)` `"hash": "blockhash", (string) the hash of the block (same as provided)` `"confirmations": n, (numeric) the number of confirmations` `"size", n (numeric) the size of the block without witness data` `"fullsize": n, (numeric) the size of the block` `"height": n, (numeric) the height of the block in the block chain` `"version": n, (numeric) the block version` `"versionHex": n, (hexadecimal) the block version` `"merkleroot": "hash", (string) root hash of the merkle tree` `"tx": [ (json array of string) the transaction hashes` `"transactionhash", (string) hash of the parent transaction` `...` `]` `"time": n, (numeric) the block time in seconds since 1 Jan 1970 GMT` `"nonce": n, (numeric) the block nonce` `"bits", n, (numeric) the bits which represent the block difficulty` `difficulty: n.nn, (numeric) the proof-of-work difficulty as a multiple of the minimum difficulty` `"previousblockhash": "hash", (string) the hash of the previous block` `"nextblockhash": "hash", (string) the hash of the next block (only if there is one)` `}`
Returns (verbosity=2)	`{ (json object)` `"hash": "blockhash", (string) the hash of the block (same as provided)` `"confirmations": n, (numeric) the number of confirmations` `"size", n (numeric) the size of the block without witness data` `"fullsize": n, (numeric) the size of the block` `"weight": n, (numeric) value of the weight metric` `"height": n, (numeric) the height of the block in the block chain` `"version": n, (numeric) the block version` `"versionHex": n, (hexadecimal) the block version` `"merkleroot": "hash", (string) root hash of the merkle tree` `"rawtx": [ (array of json objects) the transactions as json objects` `(see getrawtransaction json object details)` `]` `"time": n, (numeric) the block time in seconds since 1 Jan 1970 GMT` `"nonce": n, (numeric) the block nonce` `"bits", n, (numeric) the bits which represent the block difficulty` `difficulty: n.nn, (numeric) the proof-of-work difficulty as a multiple of the minimum difficulty` `"previousblockhash": "hash", (string) the hash of the previous block` `"nextblockhash": "hash", (string) the hash of the next block` `}`
Example Return (verbosity=0)	`"010000000000000000000000000000000000000000000000000000000000000000000000` `3ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4a29ab5f49` `ffff001d1dac2b7c01010000000100000000000000000000000000000000000000000000` ... `00000000000000000000ffffffff4d04ffff001d0104455468652054696d65732030332f` `4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f` `6e64206261696c6f757420666f722062616e6b73ffffffff0100f2052a01000000434104` `678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f` `4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5fac00000000"`
Example Return (verbosity=1)	`{` `"hash": "1db9b31bc22479d4e4f7c80b2b43767031d62a6eee992801c950389e8557f8de",` `"confirmations": 277113,` `"size": 20799,` `"height": 80039,` `"version": 268435456,` `"versionHex": 10000000,` `"merkleroot": "a96353f19793ba890a3d7aa31ed6bb101dbe36941d224af8b0af37ca9dd585ff",` `"tx": [` `"59a2a33c282bada2dc4b612979178e5f924d30c7ca4dbab4fac0960454e938ec"` `],` `"time": 1659858927,` `"nonce": 0,` `"bits": "207fffff",` `"difficulty": 1,` `"previousblockhash": "9fe1537074faaca21b2f8378be7eaf115cc20bc57ae140d2891c04f1a6e362f9",` `"nextblockhash": "00000198246f79ebf50cfad8b13327d9568f9ea87c2c1a605aa7eaf3afb4f3ec"` `}`


Method	getblockcount
Parameters	None
Description	Returns the number of blocks in the longest block chain.
Returns	numeric
Example Return	`276820`


Method	getblockhash
Parameters	1. block height (numeric, required)
Description	Returns hash of the block in best block chain at the given height.
Returns	string
Example Return	`00000198246f79ebf50cfad8b13327d9568f9ea87c2c1a605aa7eaf3afb4f3ec`


Method	getblockheader
Parameters	1. block hash (string, required) - the hash of the block 2. verbose (boolean, optional, default=true) - specifies the block header is returned as a JSON object instead of a hex-encoded string
Description	Returns hex-encoded bytes of the serialized block header.
Returns (verbose=false)	`"data" (string) hex-encoded bytes of the serialized block`
Returns (verbose=true)	`{ (json object)` `"hash": "blockhash", (string) the hash of the block (same as provided)` `"confirmations": n, (numeric) the number of confirmations` `"height": n, (numeric) the height of the block in the block chain` `"version": n, (numeric) the block version` `"versionHex": n, (hexadecimal) the block version` `"merkleroot": "hash", (string) root hash of the merkle tree` `"time": n, (numeric) the block time in seconds since 1 Jan 1970 GMT` `"nonce": n, (numeric) the block nonce` `"bits": n, (numeric) the bits which represent the block difficulty` `"difficulty": n.nn, (numeric) the proof-of-work difficulty as a multiple of the minimum difficulty` `"previousblockhash": "hash", (string) the hash of the previous block` `"nextblockhash": "hash", (string) the hash of the next block (only if there is one)` `}`
Example Return (verbose=false)	`"0200000035ab154183570282ce9afc0b494c9fc6a3cfea05aa8c1add2ecc564900000000` `38ba3d78e4500a5a7570dbe61960398add4410d278b21cd9708e6d9743f374d544fc0552` `27f1001c29c1ea3b"`
Example Return (verbose=true)	`{` `"hash": "00000000009e2958c15ff9290d571bf9459e93b19765c6801ddeccadbb160a1e",` `"confirmations": 392076,` `"height": 100000,` `"version": 268435456,` `"versionHex": 10000000,` `"merkleroot": "d574f343976d8e70d91cb278d21044dd8a396019e6db70755a0a50e4783dba38",` `"time": 1376123972,` `"nonce": 1005240617,` `"bits": "1c00f127",` `"difficulty": 271.75767393,` `"previousblockhash": "1db9b31bc22479d4e4f7c80b2b43767031d62a6eee992801c950389e8557f8de",` `"nextblockhash": "0000000000629d100db387f37d0f37c51118f250fb0946310a8c37316cbc4028"` `}`


Method	getconnectioncount
Parameters	None
Description	Returns the number of active connections to other peers
Returns	numeric
Example Return	`8`


Method	getdifficulty
Parameters	None
Description	Returns the proof-of-work difficulty as a multiple of the minimum difficulty.
Returns	numeric
Example Return	`4329637.71098248`


Method	getgenerate
Parameters	None
Description	Return if the server is set to generate coins (mine) or not.
Returns	`false` (boolean)


Method	gethashespersec
Parameters	None
Description	Returns a recent hashes per second performance measurement while generating coins (mining).
Returns	`0` (numeric)


Method	getinfo
Parameters	None
Description	Returns a JSON object containing various state info.
Notes	NOTE: Since abec does NOT contain wallet functionality, wallet-related fields are not returned. See getinfo in abewallet for a txVersion which includes that information.
Returns	`{ (json object)` `"version": n, (numeric) the version of the block` `"protocolversion": n, (numeric) the latest supported protocol txVersion` `"blocks": n, (numeric) the number of blocks processed` `"timeoffset": n, (numeric) the time offset` `"connections": n, (numeric) the number of connected peers` `"proxy": "host:port", (string) the proxy used by the server` `"difficulty": n.nn, (numeric) the current target difficulty` `"testnet": true or false, (boolean) whether or not server is using testnet` `"relayfee": n.nn, (numeric) the minimum relay fee for non-free transactions in abe/KB` `}`
Example Return	`{` `"version": 110000` `"protocolversion": 70001,` `"blocks": 298963,` `"timeoffset": 0,` `"connections": 17,` `"proxy": "",` `"difficulty": 8000872135.97,` `"testnet": false,` `"relayfee": 0.00001,` `}`


Method	getnetworkhashps
Parameters	1. blocks (numeric, optional, default=200) - The number of blocks, or -1 for blocks since last difficulty change 2. height (numeric, optional, default=-1) - Perform estimate ending with this height or -1 for current best chain block height
Description	Returns the estimated network hashes per second for the block heights provided by the parameters.
Returns	numeric
Example Return	`11341`


Method	getrawtransaction
Parameters	1. transaction hash (string, required) - the hash of the transaction 2. verbose (int, optional, default=0) - specifies the transaction is returned as a JSON object instead of hex-encoded string
Description	Returns information about a transaction given its hash.
Returns (verbose=0)	`"data" (string) hex-encoded bytes of the serialized transaction`
Returns (verbose=1)	`{ (json object)` `"hex": "data", (string) hex-encoded transaction` `"txid": "hash", (string) the hash of the transaction` `"hash": n, (string) the hash of the transaction` `"size": n, (numeric) the size of transaction` `"fullsize": n, (numeric) the full size of transaction` `"version": (numeric) the version of the transaction` `"vin": [ (array of json objects) the transaction inputs as json objects` `{ (json object)` `"serialnumber": "string", (string) the token of a transaction output` `"prevutxoring": { (json object) the data strcut of transaction output set` `"version": (numeric) the version of ring data struct` `"blockhhashs": ["array of hash string",` `hash1` `hash2` `hash3` `]` `"outpoints":[ "array of json object",` `(json object)` `"txid":"hash", (string) the hash of the transaction` `"index":n, (numeric) the index of output in transaction` `}, ...` `],` `]` `"vout": [ (array of json objects) the transaction outputs as json objects` `{ (json object)` `"n": n, (numeric) the index of this transaction output` `"script": hex, (string) the script of address and value` `}, ...` `]` `"fee": n, fee of transaction,` `"witness": hex, (string) witness for verify transaction,` `"blockhash": hex,(string) hash of block which contain the transaction,` `"confirmations": n, (numeric) the number of confirmations` `"time": n, (numeric) the timestamp of transaction` `"blocktime": n, (numeric) the timestamp of transaction` `}`
Example Return (verbose=0)	`"010000000104be666c7053ef26c6110597dad1c1e81b5e6be53d17a8b9d0b34772054bac60000000` `008c493046022100cb42f8df44eca83dd0a727988dcde9384953e830b1f8004d57485e2ede1b9c8f` `022100fbce8d84fcf2839127605818ac6c3e7a1531ebc69277c504599289fb1e9058df0141045a33` `76eeb85e494330b03c1791619d53327441002832f4bd618fd9efa9e644d242d5e1145cb9c2f71965` `656e276633d4ff1a6db5e7153a0a9042745178ebe0f5ffffffff0280841e00000000001976a91406` `...` `f1b6703d3f56427bfcfd372f952d50d04b64bd88ac4dd52700000000001976a9146b63f291c295ee` `abd9aee6be193ab2d019e7ea7088ac00000000`
Example Return (verbose=1)	`{` `"hex": "..."` `"txid": "59a2a33c282bada2dc4b612979178e5f924d30c7ca4dbab4fac0960454e938ec",` `"hash": "59a2a33c282bada2dc4b612979178e5f924d30c7ca4dbab4fac0960454e938ec",` `"size": 20685,` `"fullsize": 79958,` `"version":1,` `"vin": [` `{` `"serialnumber": "string", (string) the token of a transaction output` `"prevutxoring": { (json object) the data strcut of transaction output set` `"version": 0,` `"blockhhashs": ["array of hash string",` `"000000000000000000000000000000000000000000000000000000006a000000"` `"00000000000000000000000000000000000000000000000088ab5c62532a8a35"` `"0000000000000000000000000000000000000000000000000000000000000000"` `]` `"outpoints":[` `"txid":0000000000000000000000000000000000000000000000000000000000000000,` `"index":0` `}, ...` `],` `]` `"vout": [` `{ (json object)` `"n": 0` `"script": ...` `}, ...` `]` `"fee": n, fee of transaction,` `"witness": ...` `"blockhash": 1db9b31bc22479d4e4f7c80b2b43767031d62a6eee992801c950389e8557f8de` `"confirmations": 2,` `"time": 1659858927,` `"blocktime": 1659858927,` `}`


Method	help
Parameters	1. command (string, optional) - the command to get help for
Description	Returns a list of all commands or help for a specified command. When no `command` parameter is specified, a list of avaialable commands is returned When `command` is a valid method, the help text for that method is returned.
Returns	string
Example Return	getblockcount Returns a numeric for the number of blocks in the longest block chain.


Method	ping
Parameters	None
Description	Queues a ping to be sent to each connected peer. Ping times are provided by getpeerinfo via the `pingtime` and `pingwait` fields.
Returns	Nothing

6. Example Code

This section provides example code for interacting with the JSON-RPC API in various languages.

Go
node.js

6.1 Go

This section provides examples of using the RPC interface using Go and the rpcclient package.

Using getblockcount to Retrieve the Current Block Height
Using getblock to Retrieve the Genesis Block
Using notifyblocks to Receive blockconnected and blockdisconnected Notifications (Websocket-specific)

6.1.1 Using getblockcount to Retrieve the Current Block Height

The following is an example Go application which uses the rpcclient package to connect with a abec instance via Websockets, issues getblockcount to retrieve the current block height, and displays it.

package main

import (
	"io/ioutil"
	"log"
	"path/filepath"

	"github.com/abesuite/abec/rpcclient"
	"github.com/abesuite/abeutil"
)

func main() {
	// Load the certificate for the TLS connection which is automatically
	// generated by abec when it starts the RPC server and doesn't already
	// have one.
	abecHomeDir := abeutil.AppDataDir("abec", false)
	certs, err := ioutil.ReadFile(filepath.Join(abecHomeDir, "rpc.cert"))
	if err != nil {
		log.Fatal(err)
	}

	// Create a new RPC client using websockets.  Since this example is
	// not long-lived, the connection will be closed as soon as the program
	// exits.
	connCfg := &rpcclient.ConnConfig{
		Host:         "localhost:8667",
		Endpoint:     "ws",
		User:         "yourrpcuser",
		Pass:         "yourrpcpass",
		Certificates: certs,
	}
	client, err := rpcclient.New(connCfg, nil)
	if err != nil {
		log.Fatal(err)
	}
	defer client.Shutdown()

	// Query the RPC server for the current block count and display it.
	blockCount, err := client.GetBlockCount()
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Block count: %d", blockCount)
}

Which results in:

bash

2018/08/27 11:17:27 Block count: 536027

6.1.2 Using getblock to Retrieve the Genesis Block

The following is an example Go application which uses the rpcclient package to connect with a abec instance via Websockets, issues getblock to retrieve information about the Genesis block, and display a few details about it.

package main

import (
	"io/ioutil"
	"log"
	"path/filepath"
	"time"

	"github.com/abesuite/abec/chaincfg/chainhash"
	"github.com/abesuite/abec/rpcclient"
	"github.com/abesuite/abeutil"
)

func main() {
	// Load the certificate for the TLS connection which is automatically
	// generated by abec when it starts the RPC server and doesn't already
	// have one.
	abecHomeDir := abeutil.AppDataDir("abec", false)
	certs, err := ioutil.ReadFile(filepath.Join(abecHomeDir, "rpc.cert"))
	if err != nil {
		log.Fatal(err)
	}

	// Create a new RPC client using websockets.  Since this example is
	// not long-lived, the connection will be closed as soon as the program
	// exits.
	connCfg := &rpcclient.ConnConfig{
		Host:         "localhost:18667",
		Endpoint:     "ws",
		User:         "yourrpcuser",
		Pass:         "yourrpcpass",
		Certificates: certs,
	}
	client, err := rpcclient.New(connCfg, nil)
	if err != nil {
		log.Fatal(err)
	}
	defer client.Shutdown()

	// Query the RPC server for the genesis block using the "getblock"
	// command with the verbose flag set to true and the verboseTx flag
	// set to false.
	genesisHashStr := "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
	blockHash, err := chainhash.NewHashFromStr(genesisHashStr)
	if err != nil {
		log.Fatal(err)
	}
	block, err := client.GetBlockVerbose(blockHash)
	if err != nil {
		log.Fatal(err)
	}

	// Display some details about the returned block.
	log.Printf("Hash: %v\n", block.Hash)
	log.Printf("Previous Block: %v\n", block.PreviousHash)
	log.Printf("Next Block: %v\n", block.NextHash)
	log.Printf("Merkle root: %v\n", block.MerkleRoot)
	log.Printf("Timestamp: %v\n", time.Unix(block.Time, 0).UTC())
	log.Printf("Confirmations: %v\n", block.Confirmations)
	log.Printf("Difficulty: %f\n", block.Difficulty)
	log.Printf("Size (in bytes): %v\n", block.Size)
	log.Printf("Num transactions: %v\n", len(block.Tx))
}

Which results in:

bash

Hash: 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
Previous Block: 0000000000000000000000000000000000000000000000000000000000000000
Next Block: 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048
Merkle root: 4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b
Timestamp: 2009-01-03 18:15:05 +0000 UTC
Confirmations: 534323
Difficulty: 1.000000
Size (in bytes): 285
Num transactions: 1

6.1.3 Using notifyblocks to Receive blockconnected and blockdisconnected Notifications (Websocket-specific)

The following is an example Go application which uses the rpcclient package to connect with a abec instance via Websockets and registers for blockconnected and blockdisconnected notifications with notifyblocks. It also sets up handlers for the notifications.

package main

import (
	"io/ioutil"
	"log"
	"path/filepath"
	"time"

	"github.com/abesuite/abec/chaincfg/chainhash"
	"github.com/abesuite/abec/rpcclient"
	"github.com/abesuite/abeutil"
)

func main() {
	// Setup handlers for blockconnected and blockdisconnected
	// notifications.
	ntfnHandlers := rpcclient.NotificationHandlers{
		OnBlockConnected: func(hash *chainhash.Hash, height int32, t time.Time) {
			log.Printf("Block connected: %v (%d) %s", hash, height, t)
		},
		OnBlockDisconnected: func(hash *chainhash.Hash, height int32, t time.Time) {
			log.Printf("Block disconnected: %v (%d) %s", hash, height, t)
		},
	}

	// Load the certificate for the TLS connection which is automatically
	// generated by abec when it starts the RPC server and doesn't already
	// have one.
	abecHomeDir := abeutil.AppDataDir("abec", false)
	certs, err := ioutil.ReadFile(filepath.Join(abecHomeDir, "rpc.cert"))
	if err != nil {
		log.Fatal(err)
	}

	// Create a new RPC client using websockets.
	connCfg := &rpcclient.ConnConfig{
		Host:         "localhost:8667",
		Endpoint:     "ws",
		User:         "yourrpcuser",
		Pass:         "yourrpcpass",
		Certificates: certs,
	}
	client, err := rpcclient.New(connCfg, &ntfnHandlers)
	if err != nil {
		log.Fatal(err)
	}

	// Register for blockconnected and blockdisconneted notifications.
	if err := client.NotifyBlocks(); err != nil {
		client.Shutdown()
		log.Fatal(err)
	}

	// For this example, gracefully shutdown the client after 10 seconds.
	// Ordinarily when to shutdown the client is highly application
	// specific.
	log.Println("Client shutdown in 10 seconds...")
	time.AfterFunc(time.Second*10, func() {
		log.Println("Client shutting down...")
		client.Shutdown()
		log.Println("Client shutdown complete.")
	})

	// Wait until the client either shuts down gracefully (or the user
	// terminates the process with Ctrl+C).
	client.WaitForShutdown()
}

Example output:

2018/08/27 10:35:43 Client shutdown in 10 seconds...
2018/08/27 10:35:44 Block connected: 00000000000000000003321723557df58914658dc6fd963d547292a0a4797454 (534747) 2018-08-02 06:37:52 +0800 CST
2018/08/27 10:35:47 Block connected: 0000000000000000002e12773b798fc61dffe00ed5c3e89d3c306f8058c51e13 (534748) 2018-08-02 06:39:54 +0800 CST
2018/08/27 10:35:49 Block connected: 0000000000000000001bb311cd849839ce88499b91a201922f55a1cfafabe267 (534749) 2018-08-02 06:44:22 +0800 CST
2018/08/27 10:35:50 Block connected: 00000000000000000019d7296c9b5c175369ad337ec44b76bd4728021a09b864 (534750) 2018-08-02 06:55:44 +0800 CST
2018/08/27 10:35:53 Block connected: 00000000000000000022db98cf47e944ed58ca450c819e8fef8f8c71ca5d9901 (534751) 2018-08-02 06:57:39 +0800 CST
2018/08/27 10:35:53 Client shutting down...
2018/08/27 10:35:53 Client shutdown complete.

6.2. Example node.js Code

6.2.1 Using notifyblocks to be Notified of Block Connects and Disconnects

The following is example node.js code which uses ws (can be installed with npm install ws) to connect with a abec instance, issues notifyblocks to register for blockconnected and blockdisconnected notifications, and displays all incoming messages.

javascript

var fs = require('fs');
var WebSocket = require('ws');

// Load the certificate for the TLS connection which is automatically
// generated by abec when it starts the RPC server and doesn't already
// have one.
var cert = fs.readFileSync('/path/to/abec/appdata/rpc.cert');
var user = "yourusername";
var password = "yourpassword";


// Initiate the websocket connection.  The abec generated certificate acts as
// its own certificate authority, so it needs to be specified in the 'ca' array
// for the certificate to properly validate.
var ws = new WebSocket('wss://127.0.0.1:8667/ws', {
  headers: {
    'Authorization': 'Basic '+new Buffer(user+':'+password).toString('base64')
  },
  cert: cert,
  ca: [cert]
});
ws.on('open', function() {
    console.log('CONNECTED');
    // Send a JSON-RPC command to be notified when blocks are connected and
    // disconnected from the chain.
    ws.send('{"jsonrpc":"1.0","id":"0","method":"notifyblocks","params":[]}');
});
ws.on('message', function(data, flags) {
    console.log(data);
});
ws.on('error', function(derp) {
  console.log('ERROR:' + derp);
})
ws.on('close', function(data) {
  console.log('DISCONNECTED');
})

API for Abelian Core ​

1. Overview ​

2. HTTP POST Versus Websockets ​

3. Authentication ​

3.1 Authentication Overview ​

3.2 HTTP Basic Access Authentication ​

3.3 JSON-RPC Authenticate Command (Websocket-specific) ​

4. Command-line Utility ​

5. Standard Methods ​

5.1 Method Overview ​

5.2 Method Details ​

6. Example Code ​

6.1 Go ​

6.1.1 Using getblockcount to Retrieve the Current Block Height ​

6.1.2 Using getblock to Retrieve the Genesis Block ​

6.1.3 Using notifyblocks to Receive blockconnected and blockdisconnected Notifications (Websocket-specific) ​

6.2. Example node.js Code ​

6.2.1 Using notifyblocks to be Notified of Block Connects and Disconnects ​