Add admin view (#62)

* Add admin view

* Refactor function name

* Refactor etherscan link

* Add get_tx_hash abstract method

* Update safe_locking_service/locking_events/admin.py

Co-authored-by: Uxío <Uxio0@users.noreply.github.com>

---------

Co-authored-by: Uxío <Uxio0@users.noreply.github.com>

safe_locking_service/locking_events/admin.py

@@ -1,3 +1,80 @@
-# from django.contrib import admin
+from abc import abstractmethod
+from typing import Union
 
-# Register your models here.
+from django.contrib import admin
+from django.utils.html import format_html
+from django.utils.safestring import SafeString
+
+from gnosis.eth.clients.etherscan_client import EtherscanClient
+from gnosis.eth.django.admin import AdvancedAdminSearchMixin
+from gnosis.eth.ethereum_client import EthereumClientProvider
+from gnosis.eth.ethereum_network import EthereumNetwork
+
+from safe_locking_service.locking_events.models import (
+    EthereumTx,
+    LockEvent,
+    UnlockEvent,
+    WithdrawnEvent,
+)
+
+
+class TxHashEtherscanMixin:
+    @abstractmethod
+    def get_tx_hash(self, obj):
+        pass
+
+    def tx_hash_etherscan_link(
+        self, obj: Union[EthereumTx, LockEvent, UnlockEvent, WithdrawnEvent]
+    ) -> SafeString:
+        """
+        Return the etherscan link for every transaction hash
+
+        :param obj:
+        :return:
+        """
+        ethereum_client = EthereumClientProvider()
+        etherscan = EtherscanClient(EthereumNetwork(ethereum_client.get_chain_id()))
+
+        return format_html(
+            '<a href="{}/tx/{}">{}</a>',
+            etherscan.base_url,
+            self.get_tx_hash(obj),
+            self.get_tx_hash(obj),
+        )
+
+    tx_hash_etherscan_link.short_description = "Tx hash etherscan link"
+    tx_hash_etherscan_link.allow_tags = True
+
+
+@admin.register(EthereumTx)
+class EthereumTxAdmin(AdvancedAdminSearchMixin, admin.ModelAdmin, TxHashEtherscanMixin):
+    list_display = (
+        "block_timestamp",
+        "tx_hash_etherscan_link",
+        "block_number",
+        "block_hash",
+        "confirmed",
+    )
+    ordering = ["-block_timestamp"]
+    list_filter = ("confirmed",)
+    search_fields = ["==tx_hash"]
+
+    def get_tx_hash(self, obj: EthereumTx):
+        return obj.tx_hash
+
+
+@admin.register(LockEvent, UnlockEvent, WithdrawnEvent)
+class CommonEventAdmin(
+    AdvancedAdminSearchMixin, admin.ModelAdmin, TxHashEtherscanMixin
+):
+    list_display = (
+        "timestamp",
+        "tx_hash_etherscan_link",
+        "holder",
+        "amount",
+    )
+    ordering = ["-timestamp"]
+    search_fields = ["==ethereum_tx_id", "==holder"]
+
+    def get_tx_hash(self, obj: Union[LockEvent, UnlockEvent, WithdrawnEvent]):
+        return obj.ethereum_tx_id