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    use std::fmt;
    use serde::{Serialize, Serializer, Deserialize, Deserializer};
    use serde::de::Unexpected;
    use p2p::{Direction, PeerInfo};

    #[derive(Debug, PartialEq)]
    pub enum AddNodeOperation {
    	Add,
    	Remove,
    	OneTry,
    }

    impl<'a> Deserialize<'a> for AddNodeOperation {
    	fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'a> {
    		use serde::de::Visitor;

    		struct DummyVisitor;

    		impl<'b> Visitor<'b> for DummyVisitor {
    			type Value = AddNodeOperation;

    			fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
    				formatter.write_str("a node operation string")
    			}

    			fn visit_str<E>(self, value: &str) -> Result<AddNodeOperation, E> where E: ::serde::de::Error {
    				match value {
    					"add" => Ok(AddNodeOperation::Add),
    					"remove" => Ok(AddNodeOperation::Remove),
    					"onetry" => Ok(AddNodeOperation::OneTry),
    					_ => Err(E::invalid_value(Unexpected::Str(value), &self)),
    				}
    			}
    		}

    		deserializer.deserialize_identifier(DummyVisitor)
    	}
    }

    #[derive(Serialize)]
    pub struct NodeInfoAddress {
    	address: String,
    	connected: NodeInfoAddressConnectionType,
    }

    impl From<PeerInfo> for NodeInfoAddress {
    	fn from(info: PeerInfo) -> Self {
    		NodeInfoAddress {
    			address: format!("{}", info.address),
    			connected: match info.direction {
    				Direction::Inbound => NodeInfoAddressConnectionType::Inbound,
    				Direction::Outbound => NodeInfoAddressConnectionType::Outbound,
    			},
    		}
    	}
    }

    #[derive(Serialize)]
    pub struct NodeInfo {
    	pub addednode: String,
    	pub connected: bool,
    	pub addresses: Vec<NodeInfoAddress>,
    }

    pub enum NodeInfoAddressConnectionType {
    	Inbound,
    	Outbound,
    }

    impl Serialize for NodeInfoAddressConnectionType {
    	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
    		match *self {
    			NodeInfoAddressConnectionType::Inbound => "inbound".serialize(serializer),
    			NodeInfoAddressConnectionType::Outbound => "outbound".serialize(serializer),
    		}
    	}
    }

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