feat: add TxPoolInfo type

BREAKING CHANGE: `api.tx_pool_info` returns `TxPoolInfo` instead of `Hash`

lib/ckb/api.rb

@@ -158,9 +158,11 @@ def get_peers
       rpc.get_peers.map { |peer| Types::Peer.from_h(peer) }
     end
 
-    # @return [Hash]
+    # @return [CKB::Types::TxPoolInfo]
     def tx_pool_info
-      rpc.tx_pool_info
+      Types::TxPoolInfo.from_h(
+        rpc.tx_pool_info
+      )
     end
 
     # @return [CKB::Types::ChainInfo]

lib/ckb/types/tx_pool_info.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module CKB
+  module Types
+    class TxPoolInfo
+      attr_reader :pending, :staging, :orphan, :last_txs_updated_at
+
+      # @param pending [Integer]
+      # @param staging [Integer]
+      # @param orphan [Integer]
+      # @param last_txs_updated_at [String] timestamp
+      def initialize(pending:, staging:, orphan:, last_txs_updated_at:)
+        @pending = pending
+        @staging = staging
+        @orphan = orphan
+        @last_txs_updated_at = last_txs_updated_at
+      end
+
+      def to_h
+        {
+          pending: @pending,
+          staging: @staging,
+          orphan: @orphan,
+          last_txs_updated_at: @last_txs_updated_at
+        }
+      end
+
+      def self.from_h(hash)
+        return if hash.nil?
+
+        return hash if hash.is_a?(self.class)
+
+        new(
+          pending: hash[:pending],
+          staging: hash[:staging],
+          orphan: hash[:orphan],
+          last_txs_updated_at: hash[:last_txs_updated_at]
+        )
+      end
+    end
+  end
+end

lib/ckb/types/types.rb

@@ -18,6 +18,7 @@
 require_relative "peer_state"
 require_relative "address_info"
 require_relative "peer"
+require_relative "tx_pool_info"
 
 module CKB
   module Types

spec/ckb/api_spec.rb

@@ -96,7 +96,8 @@
 
   it "tx pool info" do
     result = api.tx_pool_info
-    expect(result[:pending] >= 0).to be true
+    expect(result).to be_a(Types::TxPoolInfo)
+    expect(result.pending >= 0).to be true
   end
 
   it "get blockchain info" do

spec/ckb/types/tx_pool_info_spec.rb

@@ -0,0 +1,16 @@
+RSpec.describe CKB::Types::TxPoolInfo do
+  let(:tx_pool_info_h) do
+    {
+      "pending": 34,
+      "staging": 22,
+      "orphan": 33,
+      "last_txs_updated_at": "1555507787683"
+    }
+  end
+
+  it "from h" do
+    tx_pool_info = CKB::Types::TxPoolInfo.from_h(tx_pool_info_h)
+    expect(tx_pool_info).to be_a(CKB::Types::TxPoolInfo)
+    expect(tx_pool_info.pending).to eq tx_pool_info_h[:pending]
+  end
+end