# All files / server dht.js

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     import { expose } from 'postmsg-rpc'
    import { pre, post } from 'prepost'
    import { preCidFromJson, preArrayOfCidFromJson } from '../serialization/cid'
    import { prePeerIdFromJson, peerInfoToJson, isPeerInfo } from '../serialization/peer'
    import { preBufferFromJson, preArrayOfBufferFromJson } from '../serialization/buffer'

    export default function (getIpfs, opts) {
      return {
        put: expose('ipfs.dht.put', pre(
          opts.pre('dht.put'),
          (...args) => getIpfs().dht.put(...args)
        ), opts),
        get: expose('ipfs.dht.get', pre(
          opts.pre('dht.get'),
          (...args) => getIpfs().dht.get(...args)
        ), opts),
        findprovs: expose('ipfs.dht.findprovs', pre(
          preBufferFromJson(0),
          opts.pre('dht.findprovs'),
          post(
            (...args) => getIpfs().dht.findprovs(...args),
            (res) => res.map((item) => isPeerInfo(item) ? peerInfoToJson(item) : item)
          )
        ), opts),
        findpeer: expose('ipfs.dht.findpeer', pre(
          prePeerIdFromJson(0),
          opts.pre('dht.findpeer'),
          post(
            (...args) => getIpfs().dht.findpeer(...args),
            (res) => isPeerInfo(res) ? peerInfoToJson(res) : res
          )
        ), opts),
        provide: expose('ipfs.dht.provide', pre(
          preBufferFromJson(0),
          preArrayOfBufferFromJson(0),
          preCidFromJson(0),
          preArrayOfCidFromJson(0),
          opts.pre('dht.provide'),
          post(
            (...args) => getIpfs().dht.provide(...args),
            // js-ipfs returns undefined
            // js-ipfs-api -> go-ipfs returns the request stream, with no data
            //
            // https://ipfs.io/docs/api/#api-v0-dht-provide
            // ^ Docs say some response should be sent, but nothing is returned in
            // current implementations.
            //
            // Returning null here so structured clone doesn't error trying to clone
            // a stream.
            () => null
          )
        ), opts),
        query: expose('ipfs.dht.query', pre(
          prePeerIdFromJson(0),
          opts.pre('dht.query'),
          post(
            (...args) => getIpfs().dht.query(...args),
            (res) => res.map((item) => isPeerInfo(item) ? peerInfoToJson(item) : item)
          )
        ), opts)
      }
    }