cosmos-explorer/src/libs/fetch.js

import fetch from 'node-fetch'
import store from '@/store'
import compareVersions from 'compare-versions'
import {
  Proposal, ProposalTally, Proposer, StakingPool, Votes, Deposit,
  Validator, StakingParameters, Block, ValidatorDistribution, StakingDelegation, WrapStdTx,
} from './data'

function commonProcess(res) {
  return res.result
}

// 头像
export function keybase(identity) {
  return fetch(`https://keybase.io/_/api/1.0/user/lookup.json?key_suffix=${identity}&fields=pictures`)
    .then(res => res.json())
}

async function refetchVersion(chain) {
  await fetch(`${chain.api}/node_info`)
    .then(res => res.json())
    .then(json => {
      const sdk = json.application_version.build_deps.find(e => e.startsWith('github.com/cosmos/cosmos-sdk'))
      const re = /(\d+(\.\d+)*)/i
      const version = sdk.match(re)
      return version[0]
    })
}

const chainAPI = class ChainFetch {
  getSelectedConfig() {
    let chain = store.state.chains.selected
    const lschains = localStorage.getItem('chains')
    if (lschains) {
      chain = JSON.parse(lschains)[chain.chain_name]
    }
    if (!chain.sdk_version) {
      chain.sdk_version = refetchVersion(chain)
    }
    this.config = chain
    return this.config
  }

  async getLatestBlock() {
    return this.get('/blocks/latest').then(data => Block.create(data))
  }

  async getBlockByHeight(height) {
    return this.get(`/blocks/${height}`).then(data => Block.create(data))
  }

  async getTxs(hash) {
    const ver = this.getSelectedConfig() ? this.config.sdk_version : '0.41'
    // /cosmos/tx/v1beta1/txs/{hash}
    if (ver && compareVersions(ver, '0.40') < 1) {
      return this.get(`/txs/${hash}`).then(data => WrapStdTx.create(data, ver))
    }
    return this.get(`/cosmos/tx/v1beta1/txs/${hash}`).then(data => WrapStdTx.create(data, ver))
  }

  async getValidatorDistribution(address) {
    return this.get(`/distribution/validators/${address}`).then(data => {
      const ret = ValidatorDistribution.create(commonProcess(data))
      ret.versionFixed(this.config.sdk_version)
      return ret
    })
  }

  async getStakingDelegatorDelegation(delegatorAddr, validatorAddr) {
    return this.get(`/staking/delegators/${delegatorAddr}/delegations/${validatorAddr}`).then(data => StakingDelegation.create(commonProcess(data)))
  }

  async getBankTotal(denom) {
    if (compareVersions(this.config.sdk_version, '0.40') < 0) {
      return this.get(`/supply/total/${denom}`).then(data => ({ amount: commonProcess(data), denom }))
    }
    return this.get(`/bank/total/${denom}`).then(data => commonProcess(data))
  }

  async getStakingPool() {
    return this.get('/staking/pool').then(data => new StakingPool().init(commonProcess(data)))
  }

  async getMintingInflation() {
    return this.get('/minting/inflation').then(data => Number(commonProcess(data)))
  }

  async getStakingParameters() {
    return this.get('/staking/parameters').then(data => new StakingParameters().init(commonProcess(data)))
  }

  async getValidatorList() {
    return this.get('/staking/validators').then(data => commonProcess(data).map(i => new Validator().init(i)))
  }

  async getStakingValidator(address) {
    return this.get(`/staking/validators/${address}`).then(data => new Validator().init(commonProcess(data)))
  }

  async getSlashingParameters() {
    return this.get('/slashing/parameters').then(data => commonProcess(data))
  }

  async getMintParameters() {
    return this.get('/minting/parameters').then(data => commonProcess(data))
  }

  async getDistributionParameters() {
    return this.get('/distribution/parameters').then(data => commonProcess(data))
  }

  async getGovernanceParameterDeposit() {
    return this.get('/gov/parameters/deposit').then(data => commonProcess(data))
  }

  async getGovernanceParameterTallying() {
    return this.get('/gov/parameters/tallying').then(data => commonProcess(data))
  }

  async getGovernanceParameterVoting() {
    return this.get('/gov/parameters/voting').then(data => commonProcess(data))
  }

  async getGovernanceTally(pid, total) {
    return this.get(`/gov/proposals/${pid}/tally`).then(data => new ProposalTally().init(commonProcess(data), total))
  }

  getGovernance(pid) {
    return this.get(`/gov/proposals/${pid}`).then(data => {
      const p = new Proposal().init(commonProcess(data), 0)
      p.versionFixed(this.config.sdk_version)
      return p
    })
  }

  async getGovernanceProposer(pid) {
    return this.get(`/gov/proposals/${pid}/proposer`).then(data => new Proposer().init(commonProcess(data)))
  }

  async getGovernanceDeposits(pid) {
    return this.get(`/gov/proposals/${pid}/deposits`).then(data => {
      const result = commonProcess(data)
      return Array.isArray(result) ? result.reverse().map(d => new Deposit().init(d)) : result
    })
  }

  async getGovernanceVotes(pid) {
    return this.get(`/gov/proposals/${pid}/votes`).then(data => commonProcess(data).map(d => new Votes().init(d)))
  }

  async getGovernanceList() {
    return Promise.all([this.get('/gov/proposals'), this.get('/staking/pool')]).then(data => {
      const pool = new StakingPool().init(commonProcess(data[1]))
      const ret = []
      commonProcess(data[0]).forEach(e => {
        const g = new Proposal().init(e, pool.bondedToken)
        g.versionFixed(this.config.sdk_version)
        ret.push(g)
      })
      return ret
    })
  }

  async get(url) {
    this.getSelectedConfig()
    const ret = await fetch(this.config.api + url).then(response => response.json())
    return ret
  }
}

export default chainAPI