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refactor: examples/peer-and-content-routing (#500)

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* refactor: examples-peer-and-content-routing

* chore: address review

* chore: review suggestions

Co-Authored-By: Jacob Heun <jacobheun@gmail.com>
This commit is contained in:
Vasco Santos
2019-12-18 02:37:36 +00:00
committed by Jacob Heun
parent 835a689965
commit 7b326cc525
3 changed files with 122 additions and 181 deletions
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75
examples/peer-and-content-routing/README.md
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@ -10,31 +10,27 @@ Content Routing is the category of modules that offer a way to find where conten
This example builds on top of the [Protocol and Stream Muxing](../protocol-and-stream-muxing). We need to install `libp2p-kad-dht`, go ahead and `npm install libp2p-kad-dht`. If you want to see the final version, open [1.js](./1.js).
First, let's update our bundle to support Peer Routing and Content Routing.
First, let's update our config to support Peer Routing and Content Routing.
```JavaScript
class MyBundle extends libp2p {
constructor (_options) {
const defaults = {
modules: {
transport: [ TCP ],
streamMuxer: [ Mplex ],
connEncryption: [ SECIO ],
// we add the DHT module that will enable Peer and Content Routing
dht: KadDHT
},
config: {
dht: {
// dht must be enabled
enabled: true,
kBucketSize: 20
}
}
}
const Libp2p = require('libp2p')
const KadDHT = require('libp2p-kad-dht')
super(defaultsDeep(_options, defaults))
const node = await Libp2p.create({
modules: {
transport: [ TCP ],
streamMuxer: [ Mplex ],
connEncryption: [ SECIO ],
// we add the DHT module that will enable Peer and Content Routing
dht: KadDHT
},
config: {
dht: {
// dht must be enabled
enabled: true
}
}
}
})
```
Once that is done, we can use the createNode function we developed in the previous example to create 3 nodes. Connect node 1 to node 2 and node 2 to node 3. We will use node 2 as a way to find the whereabouts of node 3
@ -44,22 +40,18 @@ const node1 = nodes[0]
const node2 = nodes[1]
const node3 = nodes[2]
parallel([
(cb) => node1.dial(node2.peerInfo, cb),
(cb) => node2.dial(node3.peerInfo, cb),
// Set up of the cons might take time
(cb) => setTimeout(cb, 100)
], (err) => {
if (err) { throw err }
await Promise.all([
node1.dial(node2.peerInfo),
node2.dial(node3.peerInfo)
])
//
node1.peerRouting.findPeer(node3.peerInfo.id, (err, peer) => {
if (err) { throw err }
// Set up of the cons might take time
await delay(100)
console.log('Found it, multiaddrs are:')
peer.multiaddrs.forEach((ma) => console.log(ma.toString()))
})
})
const peer = await node1.peerRouting.findPeer(node3.peerInfo.id)
console.log('Found it, multiaddrs are:')
peer.multiaddrs.forEach((ma) => console.log(ma.toString()))
```
You should see the output being something like:
@ -82,17 +74,12 @@ You can find this example completed in [2.js](./2.js), however as you will see i
Instead of calling `peerRouting.findPeer`, we will use `contentRouting.provide` and `contentRouting.findProviders`.
```JavaScript
node1.contentRouting.provide(cid, (err) => {
if (err) { throw err }
await node1.contentRouting.provide(cid)
console.log('Node %s is providing %s', node1.peerInfo.id.toB58String(), cid.toBaseEncodedString())
console.log('Node %s is providing %s', node1.peerInfo.id.toB58String(), cid.toBaseEncodedString())
const provs = await all(node3.contentRouting.findProviders(cid, { timeout: 5000 }))
node3.contentRouting.findProviders(cid, 5000, (err, providers) => {
if (err) { throw err }
console.log('Found provider:', providers[0].id.toB58String())
})
})
console.log('Found provider:', providers[0].id.toB58String())
```
The output of your program should look like: