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pdk.rs
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pdk.rs
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/// All the functions in the file are exposed from inside WASM plugins
use crate::*;
/// This macro unwraps input arguments to prevent functions from panicking,
/// it should be used instead of `Val::unwrap_*` functions
macro_rules! args {
($input:expr, $index:expr, $ty:ident) => {
match $input[$index].$ty() {
Some(x) => x,
None => return Err($crate::Error::msg("Invalid input type"))
}
};
($input:expr, $(($index:expr, $ty:ident)),*$(,)?) => {
($(
$crate::args!($input, $index, $ty),
)*)
};
}
/// Get a configuration value
/// Params: i64 (offset)
/// Returns: i64 (offset)
pub(crate) fn config_get(
mut caller: Caller<CurrentPlugin>,
input: &[Val],
output: &mut [Val],
) -> Result<(), Error> {
let data: &mut CurrentPlugin = caller.data_mut();
let offset = args!(input, 0, i64) as u64;
let handle = match data.memory_handle(offset) {
Some(h) => h,
None => anyhow::bail!("invalid handle offset for config key: {offset}"),
};
let key = data.memory_str(handle)?;
let key = unsafe {
std::str::from_utf8_unchecked(std::slice::from_raw_parts(key.as_ptr(), key.len()))
};
let val = data.manifest.config.get(key);
let ptr = val.map(|x| (x.len(), x.as_ptr()));
let mem = match ptr {
Some((len, ptr)) => {
let bytes = unsafe { std::slice::from_raw_parts(ptr, len) };
data.memory_new(bytes)?
}
None => {
output[0] = Val::I64(0);
return Ok(());
}
};
output[0] = Val::I64(mem.offset() as i64);
Ok(())
}
/// Get a variable
/// Params: i64 (offset)
/// Returns: i64 (offset)
pub(crate) fn var_get(
mut caller: Caller<CurrentPlugin>,
input: &[Val],
output: &mut [Val],
) -> Result<(), Error> {
let data: &mut CurrentPlugin = caller.data_mut();
let offset = args!(input, 0, i64) as u64;
let handle = match data.memory_handle(offset) {
Some(h) => h,
None => anyhow::bail!("invalid handle offset for var key: {offset}"),
};
let key = data.memory_str(handle)?;
let key = unsafe {
std::str::from_utf8_unchecked(std::slice::from_raw_parts(key.as_ptr(), key.len()))
};
let val = data.vars.get(key);
let ptr = val.map(|x| (x.len(), x.as_ptr()));
let mem = match ptr {
Some((len, ptr)) => {
let bytes = unsafe { std::slice::from_raw_parts(ptr, len) };
data.memory_new(bytes)?
}
None => {
output[0] = Val::I64(0);
return Ok(());
}
};
output[0] = Val::I64(mem.offset() as i64);
Ok(())
}
/// Set a variable, if the value offset is 0 then the provided key will be removed
/// Params: i64 (key offset), i64 (value offset)
/// Returns: none
pub(crate) fn var_set(
mut caller: Caller<CurrentPlugin>,
input: &[Val],
_output: &mut [Val],
) -> Result<(), Error> {
let data: &mut CurrentPlugin = caller.data_mut();
if data.manifest.memory.max_var_bytes.is_some_and(|x| x == 0) {
anyhow::bail!("Vars are disabled by this host")
}
let voffset = args!(input, 1, i64) as u64;
let key_offs = args!(input, 0, i64) as u64;
let key = {
let handle = match data.memory_handle(key_offs) {
Some(h) => h,
None => anyhow::bail!("invalid handle offset for var key: {key_offs}"),
};
let key = data.memory_str(handle)?;
let key_len = key.len();
let key_ptr = key.as_ptr();
unsafe { std::str::from_utf8_unchecked(std::slice::from_raw_parts(key_ptr, key_len)) }
};
// Remove if the value offset is 0
if voffset == 0 {
data.vars.remove(key);
return Ok(());
}
let handle = match data.memory_handle(voffset) {
Some(h) => h,
None => anyhow::bail!("invalid handle offset for var value: {voffset}"),
};
let mut size = std::mem::size_of::<String>()
+ std::mem::size_of::<Vec<u8>>()
+ key.len()
+ handle.length as usize;
for (k, v) in data.vars.iter() {
size += k.len();
size += v.len();
size += std::mem::size_of::<String>() + std::mem::size_of::<Vec<u8>>();
}
// If the store is larger than the configured size, or 1mb by default, then stop adding things
if size > data.manifest.memory.max_var_bytes.unwrap_or(1024 * 1024) as usize && voffset != 0 {
return Err(Error::msg("Variable store is full"));
}
let value = data.memory_bytes(handle)?.to_vec();
// Insert the value from memory into the `vars` map
data.vars.insert(key.to_string(), value);
Ok(())
}
/// Make an HTTP request
/// Params: i64 (offset to JSON encoded HttpRequest), i64 (offset to body or 0)
/// Returns: i64 (offset)
pub(crate) fn http_request(
#[allow(unused_mut)] mut caller: Caller<CurrentPlugin>,
input: &[Val],
output: &mut [Val],
) -> Result<(), Error> {
let data: &mut CurrentPlugin = caller.data_mut();
let http_req_offset = args!(input, 0, i64) as u64;
#[cfg(not(feature = "http"))]
{
let handle = match data.memory_handle(http_req_offset) {
Some(h) => h,
None => anyhow::bail!("http_request input is invalid: {http_req_offset}"),
};
let req: extism_manifest::HttpRequest = serde_json::from_slice(data.memory_bytes(handle)?)?;
output[0] = Val::I64(0);
anyhow::bail!(
"http_request is not enabled, request to {} is not allowed",
&req.url
);
}
#[cfg(feature = "http")]
{
use std::io::Read;
let handle = match data.memory_handle(http_req_offset) {
Some(h) => h,
None => anyhow::bail!("invalid handle offset for http request: {http_req_offset}"),
};
let req: extism_manifest::HttpRequest = serde_json::from_slice(data.memory_bytes(handle)?)?;
let body_offset = args!(input, 1, i64) as u64;
let url = match url::Url::parse(&req.url) {
Ok(u) => u,
Err(e) => return Err(Error::msg(format!("Invalid URL: {e:?}"))),
};
let allowed_hosts = &data.manifest.allowed_hosts;
let host_str = url.host_str().unwrap_or_default();
let host_matches = if let Some(allowed_hosts) = allowed_hosts {
allowed_hosts.iter().any(|url| {
let pat = match glob::Pattern::new(url) {
Ok(x) => x,
Err(_) => return url == host_str,
};
pat.matches(host_str)
})
} else {
false
};
if !host_matches {
return Err(Error::msg(format!(
"HTTP request to {} is not allowed",
req.url
)));
}
let mut r = ureq::request(req.method.as_deref().unwrap_or("GET"), &req.url);
for (k, v) in req.headers.iter() {
r = r.set(k, v);
}
// Set HTTP timeout to respect the manifest timeout
if let Some(remaining) = data.time_remaining() {
r = r.timeout(remaining);
}
let res = if body_offset > 0 {
let handle = match data.memory_handle(body_offset) {
Some(h) => h,
None => {
anyhow::bail!("invalid handle offset for http request body: {http_req_offset}")
}
};
let buf: &[u8] = data.memory_bytes(handle)?;
r.send_bytes(buf)
} else {
r.call()
};
let reader = match res {
Ok(res) => {
data.http_status = res.status();
Some(res.into_reader())
}
Err(e) => {
// Catch timeout and return
if let Some(d) = data.time_remaining() {
if e.kind() == ureq::ErrorKind::Io && d.as_nanos() == 0 {
anyhow::bail!("timeout");
}
}
let msg = e.to_string();
if let Some(res) = e.into_response() {
data.http_status = res.status();
Some(res.into_reader())
} else {
return Err(Error::msg(msg));
}
}
};
if let Some(reader) = reader {
let mut buf = Vec::new();
let max = if let Some(max) = &data.manifest.memory.max_http_response_bytes {
reader.take(*max + 1).read_to_end(&mut buf)?;
*max
} else {
reader.take(1024 * 1024 * 50 + 1).read_to_end(&mut buf)?;
1024 * 1024 * 50
};
if buf.len() > max as usize {
anyhow::bail!("HTTP response exceeds the configured maximum number of bytes: {max}")
}
let mem = data.memory_new(&buf)?;
output[0] = Val::I64(mem.offset() as i64);
} else {
output[0] = Val::I64(0);
}
Ok(())
}
}
/// Get the status code of the last HTTP request
/// Params: none
/// Returns: i32 (status code)
pub(crate) fn http_status_code(
mut caller: Caller<CurrentPlugin>,
_input: &[Val],
output: &mut [Val],
) -> Result<(), Error> {
let data: &mut CurrentPlugin = caller.data_mut();
output[0] = Val::I32(data.http_status as i32);
Ok(())
}
pub fn log(
level: tracing::Level,
mut caller: Caller<CurrentPlugin>,
input: &[Val],
_output: &mut [Val],
) -> Result<(), Error> {
let data: &mut CurrentPlugin = caller.data_mut();
let offset = args!(input, 0, i64) as u64;
let handle = match data.memory_handle(offset) {
Some(h) => h,
None => anyhow::bail!("invalid handle offset for log message: {offset}"),
};
let id = data.id.to_string();
let buf = data.memory_str(handle);
match buf {
Ok(buf) => match level {
tracing::Level::ERROR => {
tracing::error!(plugin = id, "{}", buf)
}
tracing::Level::DEBUG => {
tracing::debug!(plugin = id, "{}", buf)
}
tracing::Level::WARN => {
tracing::warn!(plugin = id, "{}", buf)
}
tracing::Level::INFO => {
tracing::info!(plugin = id, "{}", buf)
}
tracing::Level::TRACE => {
tracing::trace!(plugin = id, "{}", buf)
}
},
Err(_) => tracing::error!(plugin = id, "unable to log message: {:?}", buf),
}
Ok(())
}
/// Write to logs (warning)
/// Params: i64 (offset)
/// Returns: none
pub(crate) fn log_warn(
caller: Caller<CurrentPlugin>,
input: &[Val],
_output: &mut [Val],
) -> Result<(), Error> {
log(tracing::Level::WARN, caller, input, _output)
}
/// Write to logs (info)
/// Params: i64 (offset)
/// Returns: none
pub(crate) fn log_info(
caller: Caller<CurrentPlugin>,
input: &[Val],
_output: &mut [Val],
) -> Result<(), Error> {
log(tracing::Level::INFO, caller, input, _output)
}
/// Write to logs (debug)
/// Params: i64 (offset)
/// Returns: none
pub(crate) fn log_debug(
caller: Caller<CurrentPlugin>,
input: &[Val],
_output: &mut [Val],
) -> Result<(), Error> {
log(tracing::Level::DEBUG, caller, input, _output)
}
/// Write to logs (error)
/// Params: i64 (offset)
/// Returns: none
pub(crate) fn log_error(
caller: Caller<CurrentPlugin>,
input: &[Val],
_output: &mut [Val],
) -> Result<(), Error> {
log(tracing::Level::ERROR, caller, input, _output)
}