Blockchain explorer for Ethereum based network and a tool for inspecting and analyzing EVM based blockchains.
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blockscout/lib/explorer_web/controllers/transaction_controller.ex

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defmodule ExplorerWeb.TransactionController do
use ExplorerWeb, :controller
import Ecto.Query
alias Explorer.Repo.NewRelic, as: Repo
alias Explorer.Transaction
alias Explorer.TransactionForm
alias Explorer.Transaction.Service.Query
def index(conn, %{"last_seen" => last_seen}) do
query =
Transaction
|> Query.recently_seen(last_seen)
|> Query.include_addresses()
|> Query.require_receipt()
|> Query.require_block()
total_query =
from(
transaction in Transaction,
select: fragment("count(?)", transaction.id),
inner_join: receipt in assoc(transaction, :receipt),
inner_join: block in assoc(transaction, :block)
)
entries =
query
|> Repo.all()
|> Enum.map(&TransactionForm.build_and_merge/1)
last = List.last(entries) || Transaction.null()
render(
conn,
"index.html",
transactions: %{
entries: entries,
total_entries: Repo.one(total_query),
last_seen: last.id
}
)
end
def index(conn, params) do
query =
from(
t in Transaction,
select: t.id,
order_by: [desc: t.id],
limit: 1
)
first_id = Repo.one(query) || 0
last_seen = Integer.to_string(first_id + 1)
index(conn, Map.put(params, "last_seen", last_seen))
end
def show(conn, params) do
transaction =
Transaction
|> Query.by_hash(params["id"])
|> Query.include_addresses()
|> Query.include_receipt()
|> Query.include_block()
|> Repo.one()
|> TransactionForm.build_and_merge()
render(conn, "show.html", transaction: transaction)
end
end