district-web3-utils

Set of extra functions helpful for working with web3.js.

Installation

Add into your project.clj
Include [district.web3-utils] in your CLJS file

API Overview

• district.web3-utils
  • wei->eth
  • wei->eth-number
  • eth->wei
  • eth->wei-number
  • zero-address?
  • empty-address?
  • remove-0x
  • web3-time->date-time
  • web3-time->local-date-time
  • prepend-address-zeros
  • bytes32->str
  • uint->address

district.web3-utils

wei->eth [x]

Safely Converts wei into ether.

(web3-utils/wei->eth "1000000000000000000")
;; => "1"

(web3-utils/wei->eth (web3/to-big-number 1000000000000000000))
;; => #object[BigNumber 1]

(web3-utils/wei->eth "abc")
;; => nil

wei->eth-number [x]

Safely Converts wei into ether and coerces into number.

(web3-utils/wei->eth-number "1000000000000000000")
;; => 1

(web3-utils/wei->eth-number (web3/to-big-number 1000000000000000000))
;; => 1

eth->wei [x]

Safely Converts ether into wei.

(web3-utils/eth->wei "1.1")
;; => "1100000000000000000"

;; handles comma as fraction decimals separator as well
(web3-utils/eth->wei "1,1")
;; => "1100000000000000000"

eth->wei-number [x]

Safely Converts ether into wei and coerces into number.

(web3-utils/eth->wei-number "1.1")
;; => 1100000000000000000

zero-address? [address]

True if address is zero address

(web3-utils/zero-address? "0x")
;; => true

(web3-utils/zero-address? "0x0000000000000000000000000000000000000000")
;; => true

empty-address? [address]

True if address is zero address, empty string or nil

(web3-utils/empty-address? "0x")
;; => true

(web3-utils/empty-address? nil)
;; => true

remove-0x [address]

Removes initial "0x" from an address

(web3-utils/remove-0x "0x0000000000000000000000000000000000000000")
;; => "0000000000000000000000000000000000000000"

web3-time->date-time [x]

Converts time returned by smart-contracts (usually as BigNumber UNIX epoch) into cljs-time.

(web3-utils/web3-time->date-time (web3/to-big-number 1516223428))
;; => #object[Object 20180117T211028]

(web3-utils/web3-time->date-time 1516223428)
;; => #object[Object 20180117T211028]

(web3-utils/web3-time->date-time (web3/to-big-number 0))
;; => nil

web3-time->local-date-time [x]

Converts time returned by smart-contracts (usually as BigNumber UNIX epoch) into local cljs-time.

(web3-utils/web3-time->local-date-time (web3/to-big-number 1516223428))
;; => #object[Object 20180117T211028]

(web3-utils/web3-time->local-date-time 1516223428)
;; => #object[Object 20180117T211028]

prepend-address-zeros [address]

If given address is shorter than it should be, it prepends missing places with zeros.

(web3-utils/prepend-address-zeros "0x123")
;; => "0x0000000000000000000000000000000000000123"

bytes32->str [x]

Converts web3 bytes32 encoded string into normal string.

(web3-utils/bytes32->str "0x636f6e7374727563746564000000000000000000000000000000000000000000")
;; => "constructed"

uint->address [x]

Converts Solidity's uint into web3 address

(web3-utils/uint->address (web3/to-big-number 1234))
;; => "0x00000000000000000000000000000000000004d2"

Development

1. Run test suite:

• Browser
  • npx shadow-cljs watch test-browser
  • open https://d0x-vm:6502
  • tests refresh automatically on code change
• CI (Headless Chrome, Karma)
  • npx shadow-cljs compile test-ci
  • CHROME_BIN=`which chromium-browser` npx karma start karma.conf.js --single-run

2. Build

• on merging pull request to master on GitHub, CI builds & publishes new version automatically
• update version in build.clj
• to build: clj -T:build jar
• to release: clj -T:build deploy (needs CLOJARS_USERNAME and CLOJARS_PASSWORD env vars to be set)