Haskell Json RPC client for Factom blockchain

A JSON-RPC Haskell client for the Factom protocol. Each response has special ADT(algebraic data type) that automatically converted from JSON response. Using Remote Monad pattern multiple request can be batched and executed simulatenously, following more robust approach and reducing usage of expensive RPC calls.

Choosing a batching strategy. There are two strategies:

• Weak - a single command or a single procedure, or
• Strong - a sequence of commands, optionally terminated by a procedure

Installation

You can install package from Hackage and build with Cabal, but we recommend to use Stack tool. Add to you dependencies in stack.yaml and cabal file dependency - api-rpc-factom.

To run and test from repository

1. Build with stack

$ stack build

2. Load REPL with stack for evaluation

$ stack repl

3. execute required methods

Usage

for basic daemon functionality import with

import Factom.RPC.Api

for wallet functionality

import Factom.RPC.Wallet

Retreiving a balance

-- build communication session
let s = weakSession (traceSendAPI "" $ clientSendAPI endpoint)

-- run Remote Monad
h <- send s $ do
         -- run specific events by executing exposed
         h <- reqFactoidBalance "EC2dTBH2Nc9t9Y7RFD3FYMN5ottoPeHdk6xqUWEc6eHVoBPj6CmHx"
         return h
-- show converted ADT
print h
-- or use for special business logic

Reading Entry Data

-- build communication session
let s = weakSession (traceSendAPI "" $ clientSendAPI endpoint)

-- run Remote Monad
h <- send s $ do
         -- run specific events by executing exposed
         h <- reqEntryData "61b3d3175f211f3b23b455bb8710fdbcf545cb40da397d9e20b26eca31c389a6"
         return h
-- show converted ADT
print h
-- or use for special business logic

Writing an Entry

-- build communication session
let s = weakSession (traceSendAPI "" $ clientSendAPI endpoint)

-- run Remote Monad
(c,c',r) <- send s $ do
         -- run specific events by executing exposed
         c <- reqComposeEntry "48e0c94d00bf14d89ab10044075a370e1f55bcb28b2ff16206d865e192827645"
                              "EC2DKSYyRcNWf7RS963VFYgMExo1824HVeCfQ9PGPmNzwrcmgm2r"
         c'<- reqCommitEntry "00015507C1024BF5C956749FC3EBA4ACC60FD485FB100E601070A44FCCE54FF358D60669854734013B6A27BCCEB6A42D62A3A8D02A6F0D73653215771DE243A63AC048A18B59DA29F4CBD953E6EBE684D693FDCA270CE231783E8ECC62D630F983CD59E559C6253F84D1F54C8E8D8665D493F7B4A4C1864751E3CDEC885A64C2144E0938BF648A00"
         r <- reqRevealEntry "007E18CCC911F057FB111C7570778F6FDC51E189F35A6E6DA683EC2A264443531F000E0005746573745A0005746573745A48656C6C6F20466163746F6D21"
         return (c,c',r)
-- show converted ADT
print h
-- or use for special business logic

Block Height and Current Minute

-- build communication session
let s = weakSession (traceSendAPI "" $ clientSendAPI endpoint)

-- run Remote Monad
h <- send s $ do
         -- run specific events by executing exposed
         h <- reqGetHeight
         m <- reqCurrentMinute
         return (h,m)
-- show converted ADT
print h
-- or use for special business logic

Sending A Transaction

-- build communication session
let s = weakSession (traceSendAPI "" $ clientSendAPI endpoint)

-- preate input
let txname        = "test1234"
    inputAddress  = "FA2jK2HcLnRdS94dEcU27rF3meoJfpUcZPSinpb7AwQvPRY6RL1Q"
    inputAmount   = 1000012000
    outputAddress = "FA2yeHMMJR6rpjRYGe3Q4ogThHUmByk3WLhTjQDvPrxDoTYF8BbC"
    outputAmount  = 1000000000

-- run Remote Monad
t <- send s $ do
         -- run specific events by executing exposed
         t <- reqSendTransaction txname inputAddress inputAmount outputAddress outputAmount
         return t
-- show converted ADT
print h
-- or use for special business logic

Testing

You can load REPL with stack repl and evaluate functionality with real-time feedback using examples provided above.

Development

To contribute to the library, clone the repository, create a feature branch and submit a PR to the devel branch. Once approved and tested it will be streamlined to master i.e upstream.

Learn

• Accessing the Factom blockchain from different programming languages
• Building simple blockchain game with Factom

Contributions

The Library developed by Kompendium, LLC in partnership with Kelecorix, Inc and Sergey Bushnyak for the good of the Factom community. While we see the usage of the libraries over the months, the Factom community decided not to support this work in the form of a grant either upfront or as backpay on multiple occasions (1, 2, 3)

If you're an active user or find it useful we strongly encourage you to support our efforts and ensure long maintenance by contributing a small donation to one of the following cryptocurrency addresses:

• BTC: 39oVXpsgsyW8ZgzsnX3sV7HLdtXWfT96qN
• ETH: 0x9cDBA6bb44772259B3A3fb89cf233A147a720f34
• FCT: FA38cwer93mmPw1HxjScLmK1yF9iJTu5P87T2vdkbuLovm2YXyss