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extern crate libc;
use std::mem;
use std::path::Path;
use std::ptr::copy;
use std::slice;
use libc::{c_char, c_uchar, c_int, c_ulonglong, c_void, size_t};
const RLITE_REPLY_STRING:c_int = 1;
const RLITE_REPLY_ARRAY:c_int = 2;
const RLITE_REPLY_INTEGER:c_int = 3;
const RLITE_REPLY_NIL:c_int = 4;
const RLITE_REPLY_STATUS:c_int = 5;
const RLITE_REPLY_ERROR:c_int = 6;
#[repr(C)]
struct RliteReply {
rtype: c_int,
integer: c_ulonglong,
len: c_int,
st: *const c_uchar,
elements: size_t,
element: *const *const RliteReply,
}
#[derive(Clone, Debug, PartialEq)]
pub enum Reply {
Nil,
Integer(i64),
Data(Vec<u8>),
Status(String),
Array(Vec<Reply>),
}
macro_rules! str_to_vec {
($str: expr) => {{
let len = (*$str).len as usize;
let mut v:Vec<u8> = Vec::with_capacity(len);
v.set_len(len);
copy((*$str).st, v.as_mut_ptr() as *mut u8, len);
v
}}
}
impl Reply {
fn new(reply: *const RliteReply) -> Result<Self, String> {
unsafe {
Ok(match (*reply).rtype {
RLITE_REPLY_STRING => {
Reply::Data(str_to_vec!(reply))
},
RLITE_REPLY_STATUS => {
Reply::Status(String::from_utf8(str_to_vec!(reply)).unwrap())
},
RLITE_REPLY_ERROR => {
let s = String::from_utf8(str_to_vec!(reply)).unwrap();
return Err(s);
},
RLITE_REPLY_NIL => Reply::Nil,
RLITE_REPLY_INTEGER => Reply::Integer((*reply).integer as i64),
RLITE_REPLY_ARRAY => {
let elements:usize = (*reply).elements as usize;
let mut v = Vec::with_capacity(elements);
let slice = slice::from_raw_parts((*reply).element, elements);
for i in 0..elements {
v.push(try!(Reply::new(slice[i])));
}
Reply::Array(v)
},
_ => return Err(format!("Unknown reply type {}", (*reply).rtype)),
})
}
}
}
#[link(name = "hirlite")]
extern {
fn rliteConnect(path: *const c_char, port: c_int) -> *mut c_void;
fn rliteAppendCommandArgv(client: *mut c_void, argc: c_int, argv: *const *const u8, argvlen: *const size_t) -> c_int;
fn rliteGetReply(context: *const c_void, reply: *mut *const RliteReply) -> c_int;
fn rliteFreeReplyObject(reply: *const RliteReply);
fn rliteFree(context: *const c_void);
}
pub struct Rlite {
rlite: *mut c_void,
}
impl Rlite {
pub fn memory() -> Self {
let rlite = unsafe { rliteConnect(":memory:".as_ptr() as *const c_char, 0) };
Rlite { rlite: rlite }
}
pub fn file(path: &Path) -> Result<Self, ()> {
let f = match path.to_str() {
Some(p) => p,
None => return Err(()),
};
let rlite = unsafe { rliteConnect(::std::ffi::CString::new(f).unwrap().as_ptr() as *const c_char, 0) };
if rlite != 0 as *mut _ {
Ok(Rlite { rlite: rlite })
} else {
Err(())
}
}
pub fn write_command(&self, command: &[&[u8]]) -> Result<(), ()> {
let mut argv = Vec::new();
let mut argvlen = Vec::new();
for c in command {
argv.push(c.as_ptr());
argvlen.push(c.len() as size_t);
}
unsafe {
if rliteAppendCommandArgv(self.rlite, command.len() as c_int, argv.as_ptr(), argvlen.as_ptr()) == 0 {
Ok(())
} else {
Err(())
}
}
}
pub fn read_reply(&self) -> Result<Reply, String> {
unsafe {
let mut reply = mem::zeroed();
if rliteGetReply(self.rlite, &mut reply) == 0 {
if reply == 0 as *mut _ {
return Ok(Reply::Nil);
}
let r = Reply::new(reply);
rliteFreeReplyObject(reply);
r
} else {
Err("Failed".to_owned())
}
}
}
}
impl Drop for Rlite {
fn drop(&mut self) {
unsafe { rliteFree(self.rlite); }
}
}