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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

use ::measurement::{Measurement, Value};
use ::serializer::Serializer;

pub struct LineSerializer;

/// Line spec `Measurement` serializer.
impl LineSerializer {
    /// Constructs new `LineSerializer`.
    ///
    /// # Examples
    ///
    /// ```
    /// use influent::serializer::Serializer;
    /// use influent::serializer::line::LineSerializer;
    /// use influent::measurement::{Measurement, Value};
    ///
    /// let serializer = LineSerializer::new();
    /// let mut measurement = Measurement::new("key");
    ///
    /// measurement.add_field("field", Value::String("value"));
    /// measurement.add_tag("tag", "value");
    ///
    /// assert_eq!("key,tag=value field=\"value\"", serializer.serialize(&measurement));
    /// ```
    pub fn new() -> LineSerializer {
        LineSerializer
    }
}

fn escape(s: &str) -> String {
    s
        .replace(" ", "\\ ")
        .replace(",", "\\,")
}

fn as_string(s: &str) -> String {
    format!("\"{}\"", s.replace("\"", "\\\""))
}

fn as_integer(i: &i64) -> String {
    format!("{}i", i)
}

fn as_float(f: &f64) -> String {
    f.to_string()
}

fn as_boolean(b: &bool) -> String {
    if *b { "t".to_string() } else { "f".to_string() }
}

impl Serializer for LineSerializer {
    fn serialize(&self, measurement: &Measurement) -> String {
        let mut line = vec![escape(measurement.key)];

        for (tag, value) in measurement.tags.iter() {
            line.push(",".to_string());
            line.push(escape(tag));
            line.push("=".to_string());
            line.push(escape(value));
        }

        let mut was_spaced = false;

        for (field, value) in measurement.fields.iter() {
            line.push({if !was_spaced { was_spaced = true; " " } else { "," }}.to_string());
            line.push(escape(field));
            line.push("=".to_string());

            match value {
                &Value::String(ref s)  => line.push(as_string(s)),
                &Value::Integer(ref i) => line.push(as_integer(i)),
                &Value::Float(ref f)   => line.push(as_float(f)),
                &Value::Boolean(ref b) => line.push(as_boolean(b))
            };
        }

        match measurement.timestamp {
            Some(t) => {
                line.push(" ".to_string());
                line.push(t.to_string());
            }
            _ => {}
        }

        line.connect("")
    }
}

#[cfg(test)]
mod tests {
    use super::{as_boolean, as_string, as_integer, as_float, escape, LineSerializer};
    use ::serializer::Serializer;
    use ::measurement::{Measurement, Value};

    #[test]
    fn test_as_boolean() {
        assert_eq!("t", as_boolean(&true));
        assert_eq!("f", as_boolean(&false));
    }

    #[test]
    fn test_as_string() {
        assert_eq!("\"\\\"hello\\\"\"", as_string(&"\"hello\""));
    }

    #[test]
    fn test_as_integer() {
        assert_eq!("1i",    as_integer(&1i64));
        assert_eq!("345i",  as_integer(&345i64));
        assert_eq!("2015i", as_integer(&2015i64));
        assert_eq!("-10i",  as_integer(&-10i64));
    }

    #[test]
    fn test_as_float() {
        assert_eq!("1", as_float(&1f64));
        assert_eq!("1", as_float(&1.0f64));
        assert_eq!("-3.14", as_float(&-3.14f64));
        assert_eq!("10", as_float(&10f64));
    }

    #[test]
    fn test_escape() {
        assert_eq!("\\ ", escape(" "));
        assert_eq!("\\,", escape(","));
        assert_eq!("hello\\,\\ gobwas", escape("hello, gobwas"));
    }

    #[test]
    fn test_line_serializer() {
        let serializer = LineSerializer::new();
        let mut measurement = Measurement::new("key");

        measurement.add_field("s", Value::String("string"));
        measurement.add_field("i", Value::Integer(10));
        measurement.add_field("f", Value::Float(10f64));
        measurement.add_field("b", Value::Boolean(false));

        measurement.add_tag("tag", "value");
        
        measurement.add_field("one, two", Value::String("three"));
        measurement.add_tag("one ,two", "three, four");


        measurement.set_timestamp(10);

        assert_eq!("key,one\\ \\,two=three\\,\\ four,tag=value b=f,f=10,i=10i,one\\,\\ two=\"three\",s=\"string\" 10", serializer.serialize(&measurement));
    }

    #[test]
    fn test_line_serializer_long_timestamp() {
        let serializer = LineSerializer::new();
        let mut measurement = Measurement::new("key");

        measurement.add_field("s", Value::String("string"));

        measurement.set_timestamp(1434055562000000000);

        assert_eq!("key s=\"string\" 1434055562000000000", serializer.serialize(&measurement));
    }
}