chainstream_sdk/stream/

client.rs

//! Centrifuge WebSocket client implementation for ChainStream Stream API
//!
//! This module provides real-time data streaming capabilities using the Centrifuge protocol.

use std::collections::HashMap;
use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
use std::sync::Arc;

use futures_util::{SinkExt, StreamExt};
use parking_lot::RwLock;
use serde::{Deserialize, Serialize};
use serde_json::Value;
use tokio::sync::mpsc;
use tokio_tungstenite::{connect_async, tungstenite::protocol::Message};

use crate::error::ChainStreamError;
use crate::openapi::types::Resolution;

use super::fields::replace_filter_fields;
use super::models::*;

/// Callback type for stream subscriptions
pub type StreamCallback<T> = Box<dyn Fn(T) + Send + Sync + 'static>;

/// Unsubscribe handle
pub struct Unsubscribe {
    channel: String,
    callback_id: u64,
    api: Arc<StreamApiInner>,
}

impl Unsubscribe {
    /// Unsubscribe from the channel
    pub fn unsubscribe(self) {
        self.api.unsubscribe(&self.channel, self.callback_id);
    }
}

/// Centrifuge protocol command
#[derive(Debug, Serialize)]
struct CentrifugeCommand {
    id: u64,
    #[serde(skip_serializing_if = "Option::is_none")]
    connect: Option<ConnectRequest>,
    #[serde(skip_serializing_if = "Option::is_none")]
    subscribe: Option<SubscribeRequest>,
    #[serde(skip_serializing_if = "Option::is_none")]
    unsubscribe: Option<UnsubscribeRequest>,
}

#[derive(Debug, Serialize)]
struct ConnectRequest {
    token: String,
}

#[derive(Debug, Serialize)]
struct SubscribeRequest {
    channel: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    delta: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    filter: Option<String>,
}

#[derive(Debug, Serialize)]
struct UnsubscribeRequest {
    channel: String,
}

/// Centrifuge protocol response
#[derive(Debug, Deserialize)]
#[allow(dead_code)]
struct CentrifugeResponse {
    #[serde(default)]
    id: u64,
    #[serde(default)]
    connect: Option<Value>,
    #[serde(default)]
    subscribe: Option<Value>,
    #[serde(default)]
    push: Option<PushData>,
    #[serde(default)]
    error: Option<ErrorData>,
}

#[derive(Debug, Deserialize)]
struct PushData {
    channel: String,
    #[serde(rename = "pub")]
    pub_data: Option<PublicationData>,
}

#[derive(Debug, Deserialize)]
struct PublicationData {
    data: Value,
}

#[derive(Debug, Deserialize)]
struct ErrorData {
    code: i32,
    message: String,
}

/// Internal callback wrapper
struct CallbackWrapper {
    id: u64,
    callback: Box<dyn Fn(Value) + Send + Sync>,
}

/// Internal state of the StreamApi
struct StreamApiInner {
    url: String,
    access_token: String,
    connected: AtomicBool,
    command_id: AtomicU64,
    callback_id: AtomicU64,
    listeners: RwLock<HashMap<String, Vec<CallbackWrapper>>>,
    subscriptions: RwLock<HashMap<String, u64>>,
    command_tx: RwLock<Option<mpsc::UnboundedSender<Message>>>,
}

impl StreamApiInner {
    fn new(url: String, access_token: String) -> Self {
        Self {
            url,
            access_token,
            connected: AtomicBool::new(false),
            command_id: AtomicU64::new(1),
            callback_id: AtomicU64::new(1),
            listeners: RwLock::new(HashMap::new()),
            subscriptions: RwLock::new(HashMap::new()),
            command_tx: RwLock::new(None),
        }
    }

    fn next_command_id(&self) -> u64 {
        self.command_id.fetch_add(1, Ordering::SeqCst)
    }

    fn next_callback_id(&self) -> u64 {
        self.callback_id.fetch_add(1, Ordering::SeqCst)
    }

    fn add_listener<F>(&self, channel: &str, callback: F) -> u64
    where
        F: Fn(Value) + Send + Sync + 'static,
    {
        let callback_id = self.next_callback_id();
        let wrapper = CallbackWrapper {
            id: callback_id,
            callback: Box::new(callback),
        };

        let mut listeners = self.listeners.write();
        listeners
            .entry(channel.to_string())
            .or_default()
            .push(wrapper);

        callback_id
    }

    fn unsubscribe(&self, channel: &str, callback_id: u64) {
        let mut listeners = self.listeners.write();
        if let Some(callbacks) = listeners.get_mut(channel) {
            callbacks.retain(|c| c.id != callback_id);

            // If no more listeners, unsubscribe from channel
            if callbacks.is_empty() {
                listeners.remove(channel);
                drop(listeners);

                // Send unsubscribe command
                if let Some(tx) = self.command_tx.read().as_ref() {
                    let cmd = CentrifugeCommand {
                        id: self.next_command_id(),
                        connect: None,
                        subscribe: None,
                        unsubscribe: Some(UnsubscribeRequest {
                            channel: channel.to_string(),
                        }),
                    };
                    if let Ok(json) = serde_json::to_string(&cmd) {
                        let _ = tx.send(Message::Text(json.into()));
                    }
                }

                self.subscriptions.write().remove(channel);
                log::info!("[streaming] unsubscribed from channel: {}", channel);
            }
        }
    }

    fn dispatch_message(&self, channel: &str, data: Value) {
        let listeners = self.listeners.read();
        if let Some(callbacks) = listeners.get(channel) {
            for callback in callbacks {
                (callback.callback)(data.clone());
            }
        }
    }

    fn send_subscribe(&self, channel: &str, filter: Option<&str>) {
        if let Some(tx) = self.command_tx.read().as_ref() {
            let cmd = CentrifugeCommand {
                id: self.next_command_id(),
                connect: None,
                subscribe: Some(SubscribeRequest {
                    channel: channel.to_string(),
                    delta: Some("fossil".to_string()),
                    filter: filter.map(|f| f.to_string()),
                }),
                unsubscribe: None,
            };
            if let Ok(json) = serde_json::to_string(&cmd) {
                let _ = tx.send(Message::Text(json.into()));
            }
        }
    }
}

/// Stream API client for real-time data subscriptions
pub struct StreamApi {
    inner: Arc<StreamApiInner>,
}

impl StreamApi {
    /// Create a new StreamApi instance
    pub fn new(url: &str, access_token: &str) -> Self {
        // Build URL with token
        let url_with_token = if url.contains('?') {
            format!("{}&token={}", url, access_token)
        } else {
            format!("{}?token={}", url, access_token)
        };

        Self {
            inner: Arc::new(StreamApiInner::new(
                url_with_token,
                access_token.to_string(),
            )),
        }
    }

    /// Check if connected
    pub fn is_connected(&self) -> bool {
        self.inner.connected.load(Ordering::SeqCst)
    }

    /// Connect to the WebSocket server
    pub async fn connect(&self) -> Result<(), ChainStreamError> {
        if self.is_connected() {
            return Ok(());
        }

        let url = &self.inner.url;
        log::info!("[streaming] connecting to {}", url);

        let (ws_stream, _) = connect_async(url)
            .await
            .map_err(|e| ChainStreamError::WebSocket(format!("Failed to connect: {}", e)))?;

        let (mut write, mut read) = ws_stream.split();

        // Create command channel
        let (tx, mut rx) = mpsc::unbounded_channel::<Message>();
        *self.inner.command_tx.write() = Some(tx.clone());

        // Send connect command with token
        let connect_cmd = CentrifugeCommand {
            id: self.inner.next_command_id(),
            connect: Some(ConnectRequest {
                token: self.inner.access_token.clone(),
            }),
            subscribe: None,
            unsubscribe: None,
        };
        let connect_json = serde_json::to_string(&connect_cmd)
            .map_err(|e| ChainStreamError::Serialization(e.to_string()))?;
        write
            .send(Message::Text(connect_json.into()))
            .await
            .map_err(|e| ChainStreamError::WebSocket(format!("Failed to send connect: {}", e)))?;

        self.inner.connected.store(true, Ordering::SeqCst);

        // Spawn write task
        let inner_write = self.inner.clone();
        tokio::spawn(async move {
            while let Some(msg) = rx.recv().await {
                if write.send(msg).await.is_err() {
                    inner_write.connected.store(false, Ordering::SeqCst);
                    break;
                }
            }
        });

        // Spawn read task
        let inner_read = self.inner.clone();
        tokio::spawn(async move {
            while let Some(msg) = read.next().await {
                match msg {
                    Ok(Message::Text(text)) => {
                        if let Ok(response) = serde_json::from_str::<CentrifugeResponse>(&text) {
                            // Handle push messages (publications)
                            if let Some(push) = response.push {
                                if let Some(pub_data) = push.pub_data {
                                    inner_read.dispatch_message(&push.channel, pub_data.data);
                                }
                            }
                            // Handle errors
                            if let Some(err) = response.error {
                                log::error!(
                                    "[streaming] error: code={}, message={}",
                                    err.code,
                                    err.message
                                );
                            }
                        }
                    }
                    Ok(Message::Close(_)) => {
                        log::info!("[streaming] connection closed");
                        inner_read.connected.store(false, Ordering::SeqCst);
                        break;
                    }
                    Ok(Message::Ping(data)) => {
                        if let Some(tx) = inner_read.command_tx.read().as_ref() {
                            let _ = tx.send(Message::Pong(data));
                        }
                    }
                    Err(e) => {
                        log::error!("[streaming] read error: {}", e);
                        inner_read.connected.store(false, Ordering::SeqCst);
                        break;
                    }
                    _ => {}
                }
            }
        });

        Ok(())
    }

    /// Disconnect from the WebSocket server
    pub async fn disconnect(&self) {
        if let Some(tx) = self.inner.command_tx.write().take() {
            let _ = tx.send(Message::Close(None));
        }
        self.inner.connected.store(false, Ordering::SeqCst);
        log::info!("[streaming] disconnected");
    }

    /// Subscribe to a channel with a raw callback
    pub async fn subscribe<F>(
        &self,
        channel: &str,
        callback: F,
        filter: Option<&str>,
        method_name: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(Value) + Send + Sync + 'static,
    {
        // Ensure connected
        if !self.is_connected() {
            self.connect().await?;
        }

        // Process filter if method name is provided
        let processed_filter = match (filter, method_name) {
            (Some(f), Some(m)) if !f.is_empty() => Some(replace_filter_fields(f, m)),
            (Some(f), _) if !f.is_empty() => Some(f.to_string()),
            _ => None,
        };

        // Check if already subscribed to this channel
        let needs_subscribe = {
            let subs = self.inner.subscriptions.read();
            !subs.contains_key(channel)
        };

        // Add callback
        let callback_id = self.inner.add_listener(channel, callback);

        // Subscribe to channel if not already subscribed
        if needs_subscribe {
            self.inner
                .send_subscribe(channel, processed_filter.as_deref());
            self.inner
                .subscriptions
                .write()
                .insert(channel.to_string(), self.inner.next_command_id());
            log::info!("[streaming] subscribed to channel: {}", channel);
        }

        Ok(Unsubscribe {
            channel: channel.to_string(),
            callback_id,
            api: self.inner.clone(),
        })
    }

    // ==================== Subscription Methods ====================

    /// Subscribe to token candle data
    /// price_type: PriceType::Usd (default) or PriceType::Native
    pub async fn subscribe_token_candles<F>(
        &self,
        chain: &str,
        token_address: &str,
        resolution: Resolution,
        callback: F,
        filter: Option<&str>,
        price_type: Option<PriceType>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(Candle) + Send + Sync + 'static,
    {
        let prefix = match price_type.unwrap_or_default() {
            PriceType::Native => "dex-candle-in-native",
            PriceType::Usd => "dex-candle",
        };
        let channel = format!("{}:{}_{}_{}", prefix, chain, token_address, resolution);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(candle) = parse_candle(&data) {
                    callback(candle);
                }
            },
            filter,
            Some("subscribe_token_candles"),
        )
        .await
    }

    /// Subscribe to pool candle data
    /// price_type: PriceType::Usd (default) or PriceType::Native
    pub async fn subscribe_pool_candles<F>(
        &self,
        chain: &str,
        pool_address: &str,
        resolution: Resolution,
        callback: F,
        filter: Option<&str>,
        price_type: Option<PriceType>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(Candle) + Send + Sync + 'static,
    {
        let prefix = match price_type.unwrap_or_default() {
            PriceType::Native => "dex-pool-candle-in-native",
            PriceType::Usd => "dex-pool-candle",
        };
        let channel = format!("{}:{}_{}_{}", prefix, chain, pool_address, resolution);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(candle) = parse_candle(&data) {
                    callback(candle);
                }
            },
            filter,
            Some("subscribe_pool_candles"),
        )
        .await
    }

    /// Subscribe to pair candle data
    /// pair_address format: {tokenA}-{tokenB}
    /// price_type: PriceType::Usd (default) or PriceType::Native
    pub async fn subscribe_pair_candles<F>(
        &self,
        chain: &str,
        pair_address: &str,
        resolution: Resolution,
        callback: F,
        filter: Option<&str>,
        price_type: Option<PriceType>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(Candle) + Send + Sync + 'static,
    {
        let prefix = match price_type.unwrap_or_default() {
            PriceType::Native => "dex-pair-candle-in-native",
            PriceType::Usd => "dex-pair-candle",
        };
        let channel = format!("{}:{}_{}_{}", prefix, chain, pair_address, resolution);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(candle) = parse_candle(&data) {
                    callback(candle);
                }
            },
            filter,
            Some("subscribe_pair_candles"),
        )
        .await
    }

    /// Subscribe to token statistics
    pub async fn subscribe_token_stats<F>(
        &self,
        chain: &str,
        token_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(TokenStat) + Send + Sync + 'static,
    {
        let channel = format!("dex-token-stats:{}_{}", chain, token_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(stat) = serde_json::from_value::<TokenStat>(data) {
                    callback(stat);
                }
            },
            filter,
            Some("subscribe_token_stats"),
        )
        .await
    }

    /// Subscribe to new tokens
    pub async fn subscribe_new_token<F>(
        &self,
        chain: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(NewToken) + Send + Sync + 'static,
    {
        let channel = format!("dex-new-token:{}", chain);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(token) = parse_new_token(&data) {
                    callback(token);
                }
            },
            filter,
            Some("subscribe_new_token"),
        )
        .await
    }

    /// Subscribe to token trades
    pub async fn subscribe_token_trade<F>(
        &self,
        chain: &str,
        token_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(TradeActivity) + Send + Sync + 'static,
    {
        let channel = format!("dex-trade:{}_{}", chain, token_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(trade) = parse_trade_activity(&data) {
                    callback(trade);
                }
            },
            filter,
            Some("subscribe_token_trades"),
        )
        .await
    }

    /// Subscribe to wallet balance
    pub async fn subscribe_wallet_balance<F>(
        &self,
        chain: &str,
        wallet_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(WalletBalance) + Send + Sync + 'static,
    {
        let channel = format!("dex-wallet-balance:{}_{}", chain, wallet_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(balance) = serde_json::from_value::<WalletBalance>(data) {
                    callback(balance);
                }
            },
            filter,
            Some("subscribe_wallet_balance"),
        )
        .await
    }

    /// Subscribe to token holders
    pub async fn subscribe_token_holders<F>(
        &self,
        chain: &str,
        token_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(TokenHolder) + Send + Sync + 'static,
    {
        let channel = format!("dex-token-holder:{}_{}", chain, token_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(holder) = serde_json::from_value::<TokenHolder>(data) {
                    callback(holder);
                }
            },
            filter,
            Some("subscribe_token_holders"),
        )
        .await
    }

    /// Subscribe to token supply
    pub async fn subscribe_token_supply<F>(
        &self,
        chain: &str,
        token_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(TokenSupply) + Send + Sync + 'static,
    {
        let channel = format!("dex-token-supply:{}_{}", chain, token_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(supply) = serde_json::from_value::<TokenSupply>(data) {
                    callback(supply);
                }
            },
            filter,
            Some("subscribe_token_supply"),
        )
        .await
    }

    /// Subscribe to DEX pool balance
    pub async fn subscribe_dex_pool_balance<F>(
        &self,
        chain: &str,
        pool_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(DexPoolBalance) + Send + Sync + 'static,
    {
        let channel = format!("dex-pool-balance:{}_{}", chain, pool_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(balance) = serde_json::from_value::<DexPoolBalance>(data) {
                    callback(balance);
                }
            },
            filter,
            Some("subscribe_dex_pool_balance"),
        )
        .await
    }

    /// Subscribe to token max liquidity
    pub async fn subscribe_token_max_liquidity<F>(
        &self,
        chain: &str,
        token_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(TokenMaxLiquidity) + Send + Sync + 'static,
    {
        let channel = format!("dex-token-max-liquidity:{}_{}", chain, token_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(liquidity) = serde_json::from_value::<TokenMaxLiquidity>(data) {
                    callback(liquidity);
                }
            },
            filter,
            Some("subscribe_token_max_liquidity"),
        )
        .await
    }

    /// Subscribe to token total liquidity
    pub async fn subscribe_token_total_liquidity<F>(
        &self,
        chain: &str,
        token_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(TokenTotalLiquidity) + Send + Sync + 'static,
    {
        let channel = format!("dex-token-total-liquidity:{}_{}", chain, token_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(liquidity) = serde_json::from_value::<TokenTotalLiquidity>(data) {
                    callback(liquidity);
                }
            },
            filter,
            Some("subscribe_token_total_liquidity"),
        )
        .await
    }

    /// Subscribe to wallet PnL
    pub async fn subscribe_wallet_pnl<F>(
        &self,
        chain: &str,
        wallet_address: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(WalletTokenPnl) + Send + Sync + 'static,
    {
        let channel = format!("dex-wallet-pnl:{}_{}", chain, wallet_address);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(pnl) = serde_json::from_value::<WalletTokenPnl>(data) {
                    callback(pnl);
                }
            },
            filter,
            Some("subscribe_wallet_pnl"),
        )
        .await
    }

    /// Subscribe to new tokens metadata
    pub async fn subscribe_new_tokens_metadata<F>(
        &self,
        chain: &str,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(TokenMetadata) + Send + Sync + 'static,
    {
        let channel = format!("dex-new-token-metadata:{}", chain);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(metadata) = serde_json::from_value::<TokenMetadata>(data) {
                    callback(metadata);
                }
            },
            filter,
            Some("subscribe_new_tokens_metadata"),
        )
        .await
    }

    /// Subscribe to ranking tokens list
    pub async fn subscribe_ranking_tokens_list<F>(
        &self,
        chain: &str,
        ranking_type: RankingType,
        callback: F,
        filter: Option<&str>,
    ) -> Result<Unsubscribe, ChainStreamError>
    where
        F: Fn(RankingTokenList) + Send + Sync + 'static,
    {
        let ranking_str = match ranking_type {
            RankingType::New => "new",
            RankingType::Hot => "trending",
            RankingType::Stocks => "stocks",
            RankingType::FinalStretch => "completed",
            RankingType::Migrated => "graduated",
        };
        let channel = format!("dex-ranking-token-list:{}_{}", chain, ranking_str);

        self.subscribe(
            &channel,
            move |data| {
                if let Ok(ranking) = serde_json::from_value::<RankingTokenList>(data) {
                    callback(ranking);
                }
            },
            filter,
            None,
        )
        .await
    }
}

// Helper functions to parse data with short field names

fn parse_candle(data: &Value) -> Result<Candle, String> {
    let obj = data
        .as_object()
        .ok_or_else(|| "expected object".to_string())?;

    Ok(Candle {
        address: get_string(obj, "a"),
        open: get_string(obj, "o"),
        close: get_string(obj, "c"),
        high: get_string(obj, "h"),
        low: get_string(obj, "l"),
        volume: get_string(obj, "v"),
        resolution: get_string(obj, "r"),
        time: get_i64(obj, "t"),
        number: get_i32(obj, "n"),
    })
}

fn parse_new_token(data: &Value) -> Result<NewToken, String> {
    let obj = data
        .as_object()
        .ok_or_else(|| "expected object".to_string())?;

    Ok(NewToken {
        token_address: get_string(obj, "a"),
        name: get_string(obj, "n"),
        symbol: get_string(obj, "s"),
        decimals: obj.get("d").and_then(|v| v.as_i64()).map(|v| v as i32),
        launch_from: None, // TODO: parse if present
        created_at_ms: get_i64(obj, "cts"),
    })
}

fn parse_trade_activity(data: &Value) -> Result<TradeActivity, String> {
    let obj = data
        .as_object()
        .ok_or_else(|| "expected object".to_string())?;

    Ok(TradeActivity {
        token_address: get_string(obj, "a"),
        timestamp: get_i64(obj, "t"),
        kind: get_string(obj, "k"),
        buy_amount: get_string(obj, "ba"),
        buy_amount_in_usd: get_string(obj, "baiu"),
        buy_token_address: get_string(obj, "btma"),
        buy_token_name: get_string(obj, "btn"),
        buy_token_symbol: get_string(obj, "bts"),
        buy_wallet_address: get_string(obj, "bwa"),
        sell_amount: get_string(obj, "sa"),
        sell_amount_in_usd: get_string(obj, "saiu"),
        sell_token_address: get_string(obj, "stma"),
        sell_token_name: get_string(obj, "stn"),
        sell_token_symbol: get_string(obj, "sts"),
        sell_wallet_address: get_string(obj, "swa"),
        tx_hash: get_string(obj, "h"),
    })
}

fn get_string(obj: &serde_json::Map<String, Value>, key: &str) -> String {
    obj.get(key)
        .and_then(|v| v.as_str())
        .unwrap_or_default()
        .to_string()
}

fn get_i64(obj: &serde_json::Map<String, Value>, key: &str) -> i64 {
    obj.get(key).and_then(|v| v.as_i64()).unwrap_or_default()
}

fn get_i32(obj: &serde_json::Map<String, Value>, key: &str) -> i32 {
    obj.get(key)
        .and_then(|v| v.as_i64())
        .map(|v| v as i32)
        .unwrap_or_default()
}