feat(wrappers): add Infura WASM FDW

wasm-wrappers/fdw/infura_fdw/Cargo.toml

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+[package]
+name = "infura_fdw"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wit-bindgen-rt = "0.26.0"
+serde_json = "1.0"
+
+[package.metadata.component]
+package = "supabase:infura-fdw"
+
+[package.metadata.component.dependencies]
+
+[package.metadata.component.target]
+path = "wit"
+
+[package.metadata.component.target.dependencies]
+"supabase:wrappers" = { path = "../../wit" }

wasm-wrappers/fdw/infura_fdw/README.md

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+---
+source: https://docs.infura.io/
+documentation: https://docs.infura.io/api/networks/ethereum
+author: supabase
+tags:
+  - wasm
+  - official
+---
+
+# Infura
+
+Infura provides blockchain infrastructure that allows applications to access Ethereum network data through JSON-RPC APIs.
+
+## Available Versions
+
+| Version | Release Date |
+| ------- | ----------- |
+| 0.1.0   | TBD         |
+
+## Preparation
+
+1. Create an Infura account and project
+2. Get your Project ID from the project settings
+3. Create a foreign data wrapper and server
+
+```sql
+create extension if not exists wrappers with schema extensions;
+
+create foreign data wrapper wasm_wrapper
+  handler wasm_handler
+  validator wasm_validator;
+
+-- Using direct project ID
+create server infura_server
+  foreign data wrapper wasm_wrapper
+  options (
+    project_id 'your-project-id'
+  );
+
+-- Using vault for project ID
+insert into vault.secrets (name, secret)
+values ('infura', 'your-project-id')
+returning key_id;
+
+create server infura_server
+  foreign data wrapper wasm_wrapper
+  options (
+    project_id_id 'key-id-from-above'
+  );
+```
+
+## Entities
+
+### Block Number
+
+```sql
+create foreign table infura.block_number (
+    number bigint
+)
+    server infura_server
+    options (
+        table 'eth_blockNumber'
+    );
+```
+
+### Blocks
+
+```sql
+create foreign table infura.blocks (
+    number bigint,
+    hash text,
+    parent_hash text,
+    nonce text,
+    miner text,
+    difficulty bigint,
+    total_difficulty bigint,
+    size bigint,
+    gas_limit bigint,
+    gas_used bigint,
+    timestamp bigint
+)
+    server infura_server
+    options (
+        table 'eth_getBlockByNumber'
+    );
+```
+
+## Supported Data Types
+
+| Postgres Type | Infura Type | Description |
+| ------------ | ----------- | ----------- |
+| bigint       | hex number  | Used for block numbers, gas values, and timestamps |
+| text         | string/hex  | Used for hashes, addresses, and other hex strings |
+
+## Limitations
+
+- Only supports HTTP endpoints (no WebSocket support)
+- Rate limits apply based on your Infura plan
+- Some complex queries may timeout due to blockchain data size
+- Currently only supports eth_blockNumber and eth_getBlockByNumber methods
+- All numeric values are returned as bigint, which may not capture the full range of some Ethereum values
+
+## Examples
+
+```sql
+-- Get latest block number
+SELECT number FROM infura.block_number;
+
+-- Get block details
+SELECT number, hash, miner, timestamp
+FROM infura.blocks
+WHERE number = (SELECT number FROM infura.block_number);
+
+-- Get gas usage over time
+SELECT
+    number,
+    gas_used,
+    gas_limit,
+    (gas_used::float / gas_limit::float * 100)::numeric(5,2) as gas_usage_percent
+FROM infura.blocks
+ORDER BY number DESC
+LIMIT 10;
+```

wasm-wrappers/fdw/infura_fdw/src/lib.rs

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+#[cfg(test)]
+pub use self::InfuraFdw;
+
+use serde_json::{json, Value as JsonValue};
+use wit_bindgen_rt::*;
+
+struct InfuraFdw {
+    base_url: String,
+    headers: Vec<(String, String)>,
+    project_id: String,
+    table: String,
+    src_rows: Vec<JsonValue>,
+    src_idx: usize,
+}
+
+impl InfuraFdw {
+    // Convert hex string to decimal
+    fn hex_to_decimal(hex: &str) -> Result<i64, String> {
+        i64::from_str_radix(hex.trim_start_matches("0x"), 16)
+            .map_err(|e| format!("Failed to convert hex to decimal: {}", e))
+    }
+
+    // Create JSON-RPC request
+    fn create_request(&self, method: &str, params: Vec<String>) -> Result<http::Request, String> {
+        let url = format!("{}/{}", self.base_url, self.project_id);
+        let body = json!({
+            "jsonrpc": "2.0",
+            "method": method,
+            "params": params,
+            "id": 1
+        });
+
+        let mut headers = self.headers.clone();
+        headers.push(("Content-Type".to_string(), "application/json".to_string()));
+
+        Ok(http::Request {
+            method: http::Method::Post,
+            url,
+            headers,
+            body: body.to_string(),
+        })
+    }
+
+    // Create new instance
+    fn new(base_url: String, project_id: String) -> Self {
+        Self {
+            base_url,
+            headers: Vec::new(),
+            project_id,
+            table: String::new(),
+            src_rows: Vec::new(),
+            src_idx: 0,
+        }
+    }
+
+    // Process API response
+    fn process_response(&mut self, response: &str) -> Result<(), String> {
+        let value: JsonValue = serde_json::from_str(response)
+            .map_err(|e| format!("Failed to parse response: {}", e))?;
+
+        if let Some(error) = value.get("error") {
+            return Err(format!("API error: {}", error));
+        }
+
+        if let Some(result) = value.get("result") {
+            self.src_rows = vec![result.clone()];
+            self.src_idx = 0;
+            Ok(())
+        } else {
+            Err("No result in response".to_string())
+        }
+    }
+}
+
+wit_bindgen::generate!({
+    path: "../../wit",
+    world: "wrappers",
+});
+
+struct Component;
+
+impl wrappers::Wrappers for Component {
+    fn create_fdw() -> Box<dyn wrappers::Fdw> {
+        Box::new(InfuraFdw::new(
+            String::from("https://mainnet.infura.io/v3"),
+            String::new(), // project_id will be set from options
+        ))
+    }
+}
+
+impl wrappers::Fdw for InfuraFdw {
+    fn begin_scan(
+        &mut self,
+        quals: Vec<wrappers::Qual>,
+        attrs: Vec<wrappers::Attr>,
+        table_name: String,
+    ) -> Result<(), String> {
+        self.table = table_name;
+
+        let method = match self.table.as_str() {
+            "eth_getBlockByNumber" => "eth_getBlockByNumber",
+            "eth_blockNumber" => "eth_blockNumber",
+            _ => return Err(format!("Unsupported table: {}", self.table)),
+        };
+
+        let request = self.create_request(method, vec![])?;
+        let response = http::send_request(&request)
+            .map_err(|e| format!("HTTP request failed: {}", e))?;
+
+        if response.status_code != 200 {
+            return Err(format!("HTTP error: {}", response.status_code));
+        }
+
+        self.process_response(&response.body)
+    }
+
+    fn iter_scan(&mut self) -> Result<Option<Vec<wrappers::Datum>>, String> {
+        if self.src_idx >= self.src_rows.len() {
+            return Ok(None);
+        }
+
+        let row = &self.src_rows[self.src_idx];
+        self.src_idx += 1;
+
+        let mut data = Vec::new();
+        match self.table.as_str() {
+            "eth_blockNumber" => {
+                if let Some(block_num) = row.as_str() {
+                    data.push(wrappers::Datum::I64(Self::hex_to_decimal(block_num)?));
+                }
+            }
+            "eth_getBlockByNumber" => {
+                if let Some(obj) = row.as_object() {
+                    // Convert block data to appropriate types
+                    if let Some(num) = obj.get("number").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::I64(Self::hex_to_decimal(num)?));
+                    }
+                    if let Some(hash) = obj.get("hash").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::String(hash.to_string()));
+                    }
+                    if let Some(parent) = obj.get("parentHash").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::String(parent.to_string()));
+                    }
+                    if let Some(nonce) = obj.get("nonce").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::String(nonce.to_string()));
+                    }
+                    if let Some(miner) = obj.get("miner").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::String(miner.to_string()));
+                    }
+                    if let Some(difficulty) = obj.get("difficulty").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::I64(Self::hex_to_decimal(difficulty)?));
+                    }
+                    if let Some(total) = obj.get("totalDifficulty").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::I64(Self::hex_to_decimal(total)?));
+                    }
+                    if let Some(size) = obj.get("size").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::I64(Self::hex_to_decimal(size)?));
+                    }
+                    if let Some(gas_limit) = obj.get("gasLimit").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::I64(Self::hex_to_decimal(gas_limit)?));
+                    }
+                    if let Some(gas_used) = obj.get("gasUsed").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::I64(Self::hex_to_decimal(gas_used)?));
+                    }
+                    if let Some(timestamp) = obj.get("timestamp").and_then(|v| v.as_str()) {
+                        data.push(wrappers::Datum::I64(Self::hex_to_decimal(timestamp)?));
+                    }
+                }
+            }
+            _ => return Err(format!("Unsupported table: {}", self.table)),
+        }
+
+        Ok(Some(data))
+    }
+
+    fn end_scan(&mut self) -> Result<(), String> {
+        self.src_rows.clear();
+        self.src_idx = 0;
+        Ok(())
+    }
+
+    fn validator(&self, options: Vec<(String, Option<String>)>) -> Result<(), String> {
+        for (key, value) in options {
+            match key.as_str() {
+                "project_id" => {
+                    if value.is_none() {
+                        return Err("project_id is required".to_string());
+                    }
+                    self.project_id = value.unwrap();
+                }
+                _ => return Err(format!("Unknown option: {}", key)),
+            }
+        }
+        Ok(())
+    }
+}