Live update transactions and overview on address page

[Stamates]

Resolves #30
Resolves #31

Motivation

Adds channel setup to handle live update rendering of new transactions and balance updates on the address page to prepare for when the backend pub/sub is in place.

Changelog

Enhancements

• Initial wireup of channel updates to address transactions list and overview section to allow for live updates when the backend pub/sub system is in place to notify when a new transaction is validated.

Notes

This is only a stubbed out implementation and will require the following process to test:

1. Run iex -S mix phx.server
2. Wait for the server to run and navigate to 0xe2ac1c6843a33f81ae4935e5ef1277a392990381 address page (transactions tab)
3. Hit enter in the console that's running the server to get an iex> prompt
4. Copy and paste the code below and hit enter. Hit the up arrow to re-run the last broadcast line anytime you want a new live update.

Code for testing live update of transactions

{:ok, hash} = Explorer.Chain.string_to_transaction_hash("0xcdb45d3183664e732946f5c035e68aa3478983b126707fcd7a2c219b5075a87b")

{:ok, transaction} = Explorer.Chain.hash_to_transaction(hash, [ necessity_by_association: %{ block: :required, from_address: :optional, to_address: :optional } ])

ExplorerWeb.Endpoint.broadcast!("addresses:0xe2ac1c6843a33f81ae4935e5ef1277a392990381", "transaction", %{transaction: transaction})

Code for testing live update of overview (Note: this will change stored balance for the addresss)

{:ok, [hash]} = Explorer.Chain.update_balances([%{
      fetched_balance: 100,
      fetched_balance_block_number: 3106891,
      hash: 0xe2ac1c6843a33f81ae4935e5ef1277a392990381
    }])

{:ok, updated_address} = Explorer.Chain.hash_to_address(hash)

ExplorerWeb.Endpoint.broadcast!("addresses:#{hash}", "overview", %{address: updated_address, exchange_rate: %Explorer.ExchangeRates.Token{}, transaction_count: 1})

[amandasposito]

Maybe we could use something to control this page scope, something like https://www.npmjs.com/package/@lucasmazza/page ? WDYT?

[jimmay5469]

Nice find, we'll take a look!

[coveralls]

Coverage increased (+0.2%) to 94.551% when pulling 5281dcb on live-update-transactions-on-address-page-#31 into 56b6010 on master.

[jimmay5469]

We've decided to add some code to this to handle missed messages and also to handle when a large quantity of transactions comes in at once. I marked it WIP for now, we'll let everyone know when it is ready again for review.

[jimmay5469]

This is no longer WIP, would you mind reviewing @amandasposito or @igorffs?

[amandasposito]

why did the number change to 3? 🤔

[Stamates]

we had to send in the existing params so that we can append them (so we maintain existing params like filter), thus the arity increased to 3