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use crate::error::Error as ErrorCode;
use num_traits::FromPrimitive;
use std::time::Duration;
use thiserror::Error;
#[link(wasm_import_module = "kv")]
extern "C" {
fn host_kv_get(
key_ptr: *const u8,
key_len: u32,
sd_ptr: *mut u32,
err_code_ptr: *mut i32,
) -> i32;
fn host_kv_put(
key_ptr: *const u8,
key_len: u32,
val_ptr: *const u8,
val_len: u32,
has_ttl: u32,
ttl: u64,
error_code_ptr: *mut i32,
) -> i32;
fn host_kv_delete(key_ptr: *const u8, key_len: u32, error_code_ptr: *mut i32) -> i32;
}
#[link(wasm_import_module = "stream")]
extern "C" {
pub fn _host_stream_type(sd: u32) -> u32;
pub fn host_stream_read_n(sd: u32, ptr: *mut u8, len: u32) -> u32;
pub fn _host_stream_is_bound(sd: u32) -> u32;
pub fn host_stream_size(sd: u32) -> u32;
pub fn _host_stream_write_n(sd: u32, ptr: *mut u8, len: u32) -> u32;
pub fn host_stream_drop(sd: u32);
}
const ERROR_UNKNOWN: i32 = 1;
const ERROR_NOT_FOUND: i32 = 2;
const ERROR_UNAUTHORIZED: i32 = 4;
#[derive(Error, Debug)]
pub enum KVError {
#[error("unknown")]
Unknown,
#[error("key not found")]
NotFound,
#[error("Unauthorized")]
UnAuthorized,
}
pub fn get<S>(key: S) -> Result<Vec<u8>, KVError>
where
S: AsRef<str>,
{
let key_str = key.as_ref();
let mut sd: u32 = 0;
let mut err_code = 0;
let res = unsafe {
host_kv_get(
key_str.as_ptr(),
key_str.len() as u32,
&mut sd,
&mut err_code,
)
};
if res < 0 {
Err(KVError::from(ErrorCode::from_i32(err_code).unwrap()))
} else {
let size = unsafe { host_stream_size(sd) };
let mut val = Vec::with_capacity(size as usize);
unsafe {
let n = host_stream_read_n(sd, val.as_mut_ptr(), size);
val.set_len(n as usize);
host_stream_drop(sd);
}
Ok(val)
}
}
pub fn put<K, V>(key: K, val: V, ttl: Option<Duration>) -> Result<(), KVError>
where
K: AsRef<str>,
V: AsRef<[u8]>,
{
let key_str = key.as_ref();
let mut err = 0;
let val_slice = val.as_ref();
let res = unsafe {
host_kv_put(
key_str.as_ptr(),
key_str.len() as u32,
val_slice.as_ptr(),
val_slice.len() as u32,
ttl.is_some() as u32,
match ttl {
Some(d) => d.as_secs(),
None => 0,
},
&mut err,
)
};
if res < 0 {
Err(KVError::from(ErrorCode::from_i32(err).unwrap()))
} else {
Ok(())
}
}
pub fn delete<K>(key: K) -> Result<(), KVError>
where
K: AsRef<str>,
{
let key_str = key.as_ref();
let mut err = 0;
let res = unsafe { host_kv_delete(key_str.as_ptr(), key_str.len() as u32, &mut err) };
if res < 0 {
Err(KVError::from(ErrorCode::from_i32(err).unwrap()))
} else {
Ok(())
}
}