Added some crazy AI generated ideas, as a brainstorming exercise.

examples/integrated_defi_platform.rs

@@ -0,0 +1,720 @@
+use serde::{Deserialize, Serialize};
+use std::collections::{BTreeMap, HashMap, HashSet};
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
+
+/// This example demonstrates how multiple BFT-CRDT use cases can be combined
+/// into a comprehensive DeFi platform that operates without global consensus.
+
+// ==== Identity Layer ====
+
+#[derive(Debug, Clone, Hash, Eq, PartialEq, Serialize, Deserialize)]
+pub struct IdentityId(pub String);
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Identity {
+    pub id: IdentityId,
+    pub public_key: Vec<u8>,
+    pub attestations_received: HashSet<AttestationId>,
+    pub attestations_given: HashSet<AttestationId>,
+    pub reputation_score: f64,
+    pub created_at: u64,
+}
+
+#[derive(Debug, Clone, Hash, Eq, PartialEq, Serialize, Deserialize)]
+pub struct AttestationId(pub String);
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Attestation {
+    pub id: AttestationId,
+    pub issuer: IdentityId,
+    pub subject: IdentityId,
+    pub claim: String,
+    pub confidence: u8,
+    pub timestamp: u64,
+    pub expiry: Option<u64>,
+    pub signature: Vec<u8>,
+}
+
+// ==== Multi-Party State Channel ====
+
+#[derive(Debug, Clone, Hash, Eq, PartialEq, Serialize, Deserialize)]
+pub struct ChannelId(pub String);
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct StateChannel {
+    pub id: ChannelId,
+    pub participants: Vec<IdentityId>,
+    pub balances: HashMap<(IdentityId, String), u128>, // (user, token) -> balance
+    pub orders: OrderBookCRDT,
+    pub positions: HashMap<IdentityId, Vec<Position>>,
+    pub nonce: u64,
+    pub last_update: u64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Position {
+    pub id: String,
+    pub owner: IdentityId,
+    pub market: String,
+    pub size: i128,
+    pub entry_price: u128,
+    pub leverage: u8,
+    pub margin: u128,
+    pub unrealized_pnl: i128,
+}
+
+// ==== Order Book CRDT ====
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OrderBookCRDT {
+    pub orders: HashMap<String, Order>,
+    pub executions: HashMap<String, Execution>,
+    pub cancellations: HashSet<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Order {
+    pub id: String,
+    pub trader: IdentityId,
+    pub side: OrderSide,
+    pub price: u128,
+    pub amount: u128,
+    pub remaining: u128,
+    pub timestamp: u64,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum OrderSide {
+    Buy,
+    Sell,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Execution {
+    pub id: String,
+    pub buy_order: String,
+    pub sell_order: String,
+    pub price: u128,
+    pub amount: u128,
+    pub timestamp: u64,
+}
+
+// ==== Oracle Price Data ====
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PriceSubmission {
+    pub oracle: IdentityId,
+    pub asset: String,
+    pub price: u128,
+    pub confidence: u8,
+    pub timestamp: u64,
+    pub sources: Vec<String>,
+    pub signature: Vec<u8>,
+}
+
+// ==== Cross-Chain Messages ====
+
+#[derive(Debug, Clone, Hash, Eq, PartialEq, Serialize, Deserialize)]
+pub struct ChainId(pub String);
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CrossChainMessage {
+    pub id: String,
+    pub source_chain: ChainId,
+    pub dest_chain: ChainId,
+    pub sender: IdentityId,
+    pub action: CrossChainAction,
+    pub timestamp: u64,
+    pub signatures: Vec<Vec<u8>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum CrossChainAction {
+    Deposit { token: String, amount: u128 },
+    Withdraw { token: String, amount: u128 },
+    SyncPosition { position: Position },
+    LiquidationAlert { position_id: String },
+}
+
+// ==== Integrated DeFi Platform ====
+
+pub struct IntegratedDeFiPlatform {
+    // Identity layer
+    pub identities: HashMap<IdentityId, Identity>,
+    pub attestations: HashMap<AttestationId, Attestation>,
+
+    // State channels
+    pub channels: HashMap<ChannelId, StateChannel>,
+
+    // Oracle data
+    pub price_submissions: BTreeMap<(String, u64), Vec<PriceSubmission>>,
+
+    // Cross-chain messages
+    pub cross_chain_messages: HashMap<String, CrossChainMessage>,
+
+    // Platform parameters
+    pub min_reputation_score: f64,
+    pub liquidation_threshold: f64,
+}
+
+impl IntegratedDeFiPlatform {
+    pub fn new() -> Self {
+        Self {
+            identities: HashMap::new(),
+            attestations: HashMap::new(),
+            channels: HashMap::new(),
+            price_submissions: BTreeMap::new(),
+            cross_chain_messages: HashMap::new(),
+            min_reputation_score: 0.5,
+            liquidation_threshold: 0.8,
+        }
+    }
+
+    // ==== Identity Functions ====
+
+    pub fn create_identity(&mut self, id: IdentityId, public_key: Vec<u8>) -> Result<(), String> {
+        if self.identities.contains_key(&id) {
+            return Err("Identity already exists".to_string());
+        }
+
+        let identity = Identity {
+            id: id.clone(),
+            public_key,
+            attestations_received: HashSet::new(),
+            attestations_given: HashSet::new(),
+            reputation_score: 0.0,
+            created_at: Self::timestamp(),
+        };
+
+        self.identities.insert(id, identity);
+        Ok(())
+    }
+
+    pub fn create_attestation(
+        &mut self,
+        issuer: IdentityId,
+        subject: IdentityId,
+        claim: String,
+        confidence: u8,
+    ) -> Result<AttestationId, String> {
+        // Check issuer exists and has sufficient reputation
+        let issuer_identity = self.identities.get(&issuer).ok_or("Issuer not found")?;
+
+        if issuer_identity.reputation_score < self.min_reputation_score {
+            return Err("Insufficient reputation to issue attestations".to_string());
+        }
+
+        let attestation_id = AttestationId(format!("att_{}", Self::timestamp()));
+        let attestation = Attestation {
+            id: attestation_id.clone(),
+            issuer: issuer.clone(),
+            subject: subject.clone(),
+            claim,
+            confidence,
+            timestamp: Self::timestamp(),
+            expiry: None,
+            signature: vec![1, 2, 3], // Placeholder signature
+        };
+
+        // Update both identities
+        self.attestations
+            .insert(attestation_id.clone(), attestation);
+
+        if let Some(issuer_identity) = self.identities.get_mut(&issuer) {
+            issuer_identity
+                .attestations_given
+                .insert(attestation_id.clone());
+        }
+
+        if let Some(subject_identity) = self.identities.get_mut(&subject) {
+            subject_identity
+                .attestations_received
+                .insert(attestation_id.clone());
+            // Simple reputation update
+            subject_identity.reputation_score += (confidence as f64 / 100.0) * 0.1;
+        }
+
+        Ok(attestation_id)
+    }
+
+    // ==== State Channel Functions ====
+
+    pub fn create_channel(&mut self, participants: Vec<IdentityId>) -> Result<ChannelId, String> {
+        // Verify all participants exist and have sufficient reputation
+        for participant in &participants {
+            let identity = self
+                .identities
+                .get(participant)
+                .ok_or("Participant not found")?;
+
+            if identity.reputation_score < self.min_reputation_score {
+                return Err(format!(
+                    "Participant {} has insufficient reputation",
+                    participant.0
+                ));
+            }
+        }
+
+        let channel_id = ChannelId(format!("channel_{}", Self::timestamp()));
+        let channel = StateChannel {
+            id: channel_id.clone(),
+            participants,
+            balances: HashMap::new(),
+            orders: OrderBookCRDT {
+                orders: HashMap::new(),
+                executions: HashMap::new(),
+                cancellations: HashSet::new(),
+            },
+            positions: HashMap::new(),
+            nonce: 0,
+            last_update: Self::timestamp(),
+        };
+
+        self.channels.insert(channel_id.clone(), channel);
+        Ok(channel_id)
+    }
+
+    pub fn place_order(
+        &mut self,
+        channel_id: &ChannelId,
+        trader: &IdentityId,
+        side: OrderSide,
+        price: u128,
+        amount: u128,
+    ) -> Result<String, String> {
+        let channel = self
+            .channels
+            .get_mut(channel_id)
+            .ok_or("Channel not found")?;
+
+        // Verify trader is participant
+        if !channel.participants.contains(trader) {
+            return Err("Trader not in channel".to_string());
+        }
+
+        // Check balance for sells or margin for buys
+        match side {
+            OrderSide::Sell => {
+                let balance = channel
+                    .balances
+                    .get(&(trader.clone(), "ETH".to_string()))
+                    .unwrap_or(&0);
+                if *balance < amount {
+                    return Err("Insufficient balance".to_string());
+                }
+            }
+            OrderSide::Buy => {
+                let usdc_balance = channel
+                    .balances
+                    .get(&(trader.clone(), "USDC".to_string()))
+                    .unwrap_or(&0);
+                let required = price * amount / 1_000_000; // Assuming 6 decimals
+                if *usdc_balance < required {
+                    return Err("Insufficient USDC balance".to_string());
+                }
+            }
+        }
+
+        let order_id = format!("order_{}_{}", trader.0, Self::timestamp());
+        let order = Order {
+            id: order_id.clone(),
+            trader: trader.clone(),
+            side,
+            price,
+            amount,
+            remaining: amount,
+            timestamp: Self::timestamp(),
+        };
+
+        channel.orders.orders.insert(order_id.clone(), order);
+        channel.last_update = Self::timestamp();
+        channel.nonce += 1;
+
+        // Try to match orders
+        self.match_orders(channel_id)?;
+
+        Ok(order_id)
+    }
+
+    fn match_orders(&mut self, channel_id: &ChannelId) -> Result<(), String> {
+        let channel = self
+            .channels
+            .get_mut(channel_id)
+            .ok_or("Channel not found")?;
+
+        let mut executions = Vec::new();
+
+        // Simple matching logic
+        let mut buy_orders: Vec<_> = channel
+            .orders
+            .orders
+            .values()
+            .filter(|o| matches!(o.side, OrderSide::Buy) && o.remaining > 0)
+            .collect();
+        buy_orders.sort_by_key(|o| std::cmp::Reverse(o.price));
+
+        let mut sell_orders: Vec<_> = channel
+            .orders
+            .orders
+            .values()
+            .filter(|o| matches!(o.side, OrderSide::Sell) && o.remaining > 0)
+            .collect();
+        sell_orders.sort_by_key(|o| o.price);
+
+        for buy_order in buy_orders {
+            for sell_order in &mut sell_orders {
+                if buy_order.price >= sell_order.price
+                    && buy_order.remaining > 0
+                    && sell_order.remaining > 0
+                {
+                    let amount = buy_order.remaining.min(sell_order.remaining);
+                    let execution = Execution {
+                        id: format!("exec_{}", Self::timestamp()),
+                        buy_order: buy_order.id.clone(),
+                        sell_order: sell_order.id.clone(),
+                        price: sell_order.price,
+                        amount,
+                        timestamp: Self::timestamp(),
+                    };
+                    executions.push(execution);
+                }
+            }
+        }
+
+        // Apply executions
+        for execution in executions {
+            channel
+                .orders
+                .executions
+                .insert(execution.id.clone(), execution.clone());
+
+            // Update order remaining amounts
+            if let Some(buy_order) = channel.orders.orders.get_mut(&execution.buy_order) {
+                buy_order.remaining -= execution.amount;
+            }
+            if let Some(sell_order) = channel.orders.orders.get_mut(&execution.sell_order) {
+                sell_order.remaining -= execution.amount;
+            }
+
+            // Update balances
+            // This is simplified - real implementation would handle decimals properly
+            let buyer = channel
+                .orders
+                .orders
+                .get(&execution.buy_order)
+                .unwrap()
+                .trader
+                .clone();
+            let seller = channel
+                .orders
+                .orders
+                .get(&execution.sell_order)
+                .unwrap()
+                .trader
+                .clone();
+
+            *channel
+                .balances
+                .entry((buyer.clone(), "ETH".to_string()))
+                .or_insert(0) += execution.amount;
+            *channel
+                .balances
+                .entry((seller.clone(), "ETH".to_string()))
+                .or_insert(0) -= execution.amount;
+
+            let usdc_amount = execution.price * execution.amount / 1_000_000;
+            *channel
+                .balances
+                .entry((buyer, "USDC".to_string()))
+                .or_insert(0) -= usdc_amount;
+            *channel
+                .balances
+                .entry((seller, "USDC".to_string()))
+                .or_insert(0) += usdc_amount;
+        }
+
+        Ok(())
+    }
+
+    // ==== Oracle Functions ====
+
+    pub fn submit_price(
+        &mut self,
+        oracle: IdentityId,
+        asset: String,
+        price: u128,
+        confidence: u8,
+    ) -> Result<(), String> {
+        // Verify oracle has sufficient reputation
+        let oracle_identity = self.identities.get(&oracle).ok_or("Oracle not found")?;
+
+        if oracle_identity.reputation_score < self.min_reputation_score * 2.0 {
+            return Err("Insufficient reputation to submit prices".to_string());
+        }
+
+        let submission = PriceSubmission {
+            oracle,
+            asset: asset.clone(),
+            price,
+            confidence,
+            timestamp: Self::timestamp(),
+            sources: vec!["binance".to_string(), "coinbase".to_string()],
+            signature: vec![1, 2, 3],
+        };
+
+        let key = (asset, submission.timestamp);
+        self.price_submissions
+            .entry(key)
+            .or_insert_with(Vec::new)
+            .push(submission);
+
+        Ok(())
+    }
+
+    pub fn get_aggregate_price(&self, asset: &str, time_window: Duration) -> Option<u128> {
+        let now = Self::timestamp();
+        let start_time = now - time_window.as_secs();
+
+        let mut prices = Vec::new();
+
+        for ((price_asset, timestamp), submissions) in &self.price_submissions {
+            if price_asset == asset && *timestamp >= start_time && *timestamp <= now {
+                for submission in submissions {
+                    // Weight by confidence
+                    for _ in 0..submission.confidence {
+                        prices.push(submission.price);
+                    }
+                }
+            }
+        }
+
+        if prices.is_empty() {
+            return None;
+        }
+
+        // Calculate weighted median
+        prices.sort();
+        Some(prices[prices.len() / 2])
+    }
+
+    // ==== Cross-Chain Functions ====
+
+    pub fn send_cross_chain_message(
+        &mut self,
+        source_chain: ChainId,
+        dest_chain: ChainId,
+        sender: IdentityId,
+        action: CrossChainAction,
+    ) -> Result<String, String> {
+        let message_id = format!("msg_{}", Self::timestamp());
+        let message = CrossChainMessage {
+            id: message_id.clone(),
+            source_chain,
+            dest_chain,
+            sender,
+            action,
+            timestamp: Self::timestamp(),
+            signatures: vec![vec![1, 2, 3]], // Placeholder
+        };
+
+        self.cross_chain_messages
+            .insert(message_id.clone(), message);
+        Ok(message_id)
+    }
+
+    // ==== Liquidation Monitor ====
+
+    pub fn check_liquidations(&mut self, channel_id: &ChannelId) -> Result<Vec<String>, String> {
+        let channel = self.channels.get(channel_id).ok_or("Channel not found")?;
+
+        let mut liquidations = Vec::new();
+
+        for (identity, positions) in &channel.positions {
+            for position in positions {
+                // Get current price
+                let price = self
+                    .get_aggregate_price(&position.market, Duration::from_secs(300))
+                    .unwrap_or(position.entry_price);
+
+                // Calculate health
+                let value = (position.size.abs() as u128) * price / 1_000_000;
+                let health = position.margin as f64 / value as f64;
+
+                if health < self.liquidation_threshold {
+                    liquidations.push(position.id.clone());
+
+                    // Send cross-chain alert
+                    self.send_cross_chain_message(
+                        ChainId("ethereum".to_string()),
+                        ChainId("arbitrum".to_string()),
+                        identity.clone(),
+                        CrossChainAction::LiquidationAlert {
+                            position_id: position.id.clone(),
+                        },
+                    )?;
+                }
+            }
+        }
+
+        Ok(liquidations)
+    }
+
+    // ==== CRDT Merge Function ====
+
+    pub fn merge(&mut self, other: &Self) {
+        // Merge identities
+        for (id, identity) in &other.identities {
+            self.identities
+                .entry(id.clone())
+                .or_insert_with(|| identity.clone());
+        }
+
+        // Merge attestations
+        for (id, attestation) in &other.attestations {
+            self.attestations
+                .entry(id.clone())
+                .or_insert_with(|| attestation.clone());
+        }
+
+        // Merge channels (simplified - real implementation would merge internal state)
+        for (id, channel) in &other.channels {
+            if let Some(our_channel) = self.channels.get_mut(id) {
+                // Merge orders
+                for (order_id, order) in &channel.orders.orders {
+                    our_channel
+                        .orders
+                        .orders
+                        .entry(order_id.clone())
+                        .or_insert_with(|| order.clone());
+                }
+                // Merge executions
+                for (exec_id, execution) in &channel.orders.executions {
+                    our_channel
+                        .orders
+                        .executions
+                        .entry(exec_id.clone())
+                        .or_insert_with(|| execution.clone());
+                }
+                // Update nonce to max
+                our_channel.nonce = our_channel.nonce.max(channel.nonce);
+            } else {
+                self.channels.insert(id.clone(), channel.clone());
+            }
+        }
+
+        // Merge price submissions
+        for (key, submissions) in &other.price_submissions {
+            self.price_submissions
+                .entry(key.clone())
+                .or_insert_with(Vec::new)
+                .extend(submissions.clone());
+        }
+
+        // Merge cross-chain messages
+        for (id, message) in &other.cross_chain_messages {
+            self.cross_chain_messages
+                .entry(id.clone())
+                .or_insert_with(|| message.clone());
+        }
+    }
+
+    fn timestamp() -> u64 {
+        SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap()
+            .as_secs()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_integrated_platform() {
+        let mut platform = IntegratedDeFiPlatform::new();
+
+        // Create identities
+        let alice = IdentityId("alice".to_string());
+        let bob = IdentityId("bob".to_string());
+        let oracle = IdentityId("oracle1".to_string());
+
+        platform
+            .create_identity(alice.clone(), vec![1, 2, 3])
+            .unwrap();
+        platform
+            .create_identity(bob.clone(), vec![4, 5, 6])
+            .unwrap();
+        platform
+            .create_identity(oracle.clone(), vec![7, 8, 9])
+            .unwrap();
+
+        // Build reputation through attestations
+        platform
+            .identities
+            .get_mut(&alice)
+            .unwrap()
+            .reputation_score = 1.0;
+        platform
+            .create_attestation(alice.clone(), bob.clone(), "TrustedTrader".to_string(), 90)
+            .unwrap();
+
+        platform
+            .identities
+            .get_mut(&oracle)
+            .unwrap()
+            .reputation_score = 2.0;
+
+        // Create trading channel
+        let channel_id = platform
+            .create_channel(vec![alice.clone(), bob.clone()])
+            .unwrap();
+
+        // Add some balances
+        let channel = platform.channels.get_mut(&channel_id).unwrap();
+        channel
+            .balances
+            .insert((alice.clone(), "ETH".to_string()), 10_000_000);
+        channel
+            .balances
+            .insert((bob.clone(), "USDC".to_string()), 25_000_000_000);
+
+        // Submit oracle prices
+        platform
+            .submit_price(oracle.clone(), "ETH".to_string(), 2500_000_000, 95)
+            .unwrap();
+
+        // Place orders
+        platform
+            .place_order(
+                &channel_id,
+                &alice,
+                OrderSide::Sell,
+                2505_000_000,
+                5_000_000,
+            )
+            .unwrap();
+        platform
+            .place_order(&channel_id, &bob, OrderSide::Buy, 2510_000_000, 3_000_000)
+            .unwrap();
+
+        // Check that orders matched
+        let channel = platform.channels.get(&channel_id).unwrap();
+        assert!(!channel.orders.executions.is_empty());
+
+        // Check cross-chain functionality
+        platform
+            .send_cross_chain_message(
+                ChainId("ethereum".to_string()),
+                ChainId("polygon".to_string()),
+                alice.clone(),
+                CrossChainAction::Deposit {
+                    token: "USDC".to_string(),
+                    amount: 1000_000_000,
+                },
+            )
+            .unwrap();
+
+        assert!(!platform.cross_chain_messages.is_empty());
+    }
+}