1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113

#![allow(unused_must_use)]

use formatter::Formatter;
use std::io;
use std::io::Write;
use types::EncodingType;
use super::write_str;

pub struct Protocol {
    out: Box<Write+'static>,
    last_expiry: Option<u64>
}

impl Protocol {
    pub fn new() -> Protocol {
        let out = Box::new(io::stdout());
        Protocol { out: out, last_expiry: None }
    }
}

impl Protocol {
    fn emit(&mut self, args: Vec<&[u8]>) {
        write_str(&mut self.out, "*");
        self.out.write_all(args.len().to_string().as_bytes());
        write_str(&mut self.out, "\r\n");
        for arg in args.iter() {
            write_str(&mut self.out, "$");
            self.out.write_all(arg.len().to_string().as_bytes());
            write_str(&mut self.out, "\r\n");
            self.out.write_all(arg.as_slice());
            write_str(&mut self.out, "\r\n");
        }
    }

    fn pre_expire(&mut self, expiry: Option<u64>) {
        self.last_expiry = expiry
    }

    fn post_expire(&mut self, key: &[u8]) {
        if let Some(expire) = self.last_expiry {
            let expire = expire.to_string();
            self.emit(vec!["EXPIREAT".as_bytes(), key, expire.as_bytes()]);
            self.last_expiry = None;
        }
    }
}

impl Formatter for Protocol {
    fn start_rdb(&mut self) {
    }

    fn end_rdb(&mut self) {
    }

    fn start_database(&mut self, db_number: u32) {
        let db = db_number.to_string();
        self.emit(vec!["SELECT".as_bytes(), db.as_bytes()])
    }

    fn set(&mut self, key: &[u8], value: &[u8], expiry: Option<u64>) {
        self.pre_expire(expiry);
        self.emit(vec!["SET".as_bytes(), key, value]);
        self.post_expire(key);
    }

    fn start_hash(&mut self, _key: &[u8], _length: u32,
                  expiry: Option<u64>, _info: EncodingType) {
        self.pre_expire(expiry);
    }
    fn end_hash(&mut self, key: &[u8]) {
        self.post_expire(key);
    }
    fn hash_element(&mut self, key: &[u8], field: &[u8], value: &[u8]) {
        self.emit(vec!["HSET".as_bytes(), key, field, value]);
    }


    fn start_set(&mut self, _key: &[u8], _cardinality: u32,
                 expiry: Option<u64>, _info: EncodingType) {
        self.pre_expire(expiry);
    }
    fn end_set(&mut self, key: &[u8]) {
        self.post_expire(key);
    }
    fn set_element(&mut self, key: &[u8], member: &[u8]) {
        self.emit(vec!["SADD".as_bytes(), key, member]);
    }


    fn start_list(&mut self, _key: &[u8], _length: u32,
                  expiry: Option<u64>, _info: EncodingType) {
        self.pre_expire(expiry);
    }
    fn end_list(&mut self, key: &[u8]) {
        self.post_expire(key);
    }
    fn list_element(&mut self, key: &[u8], value: &[u8]) {
        self.emit(vec!["RPUSH".as_bytes(), key, value]);
    }

    fn start_sorted_set(&mut self, _key: &[u8], _length: u32,
                        expiry: Option<u64>, _info: EncodingType) {
        self.pre_expire(expiry);
    }
    fn end_sorted_set(&mut self, key: &[u8]) {
        self.post_expire(key);
    }
    fn sorted_set_element(&mut self, key: &[u8],
                          score: f64, member: &[u8]) {
        let score = score.to_string();
        self.emit(vec!["ZADD".as_bytes(), key, score.as_bytes(), member]);
    }
}