Create ChannelManager.sol

blockchain_integration/pi_network/pi-network-layer2-scaling/contracts/state-channels/ChannelManager.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "./StateChannel.sol";
+
+contract ChannelManager {
+    mapping(address => mapping(address => StateChannel)) public channels;
+    event ChannelCreated(address indexed participantA, address indexed participantB, address channelAddress);
+
+    function createChannel(address _participantB) external {
+        require(_participantB != msg.sender, "Cannot create channel with self");
+        StateChannel channel = new StateChannel(msg.sender, _participantB, address(this));
+        channels[msg.sender][_participantB] = channel;
+        emit ChannelCreated(msg.sender, _participantB, address(channel));
+    }
+
+    function getChannel(address _participantA, address _participantB) external view returns (StateChannel) {
+        return channels[_participantA][_participantB];
+    }
+}