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

// Copyright (c) 2021 Ant group
//
// SPDX-License-Identifier: Apache-2.0
//

use crate::ttrpc::KeyValue;
use std::collections::HashMap;

#[derive(Default, Debug)]
pub struct Context {
    pub metadata: HashMap<String, Vec<String>>,
    pub timeout_nano: i64,
}

pub fn with_timeout(i: i64) -> Context {
    Context {
        timeout_nano: i,
        ..Default::default()
    }
}

pub fn with_metadata(md: HashMap<String, Vec<String>>) -> Context {
    Context {
        metadata: md,
        ..Default::default()
    }
}

impl Context {
    // appends additional values to the given key.
    pub fn add(&mut self, key: String, value: String) {
        if let Some(ref mut vl) = self.metadata.get_mut(&key) {
            vl.push(value);
        } else {
            self.metadata.insert(key.to_lowercase(), vec![value]);
        }
    }

    // Set sets the provided values for a given key.
    // The values will overwrite any existing values.
    // If no values provided, a key will be deleted.
    pub fn set(&mut self, key: String, value: Vec<String>) {
        if value.is_empty() {
            self.metadata.remove(&key);
        } else {
            self.metadata.insert(key.to_lowercase(), value);
        }
    }
}

pub fn from_pb(kvs: &protobuf::RepeatedField<KeyValue>) -> HashMap<String, Vec<String>> {
    let mut meta: HashMap<String, Vec<String>> = HashMap::new();
    for kv in kvs {
        if let Some(ref mut vl) = meta.get_mut(&kv.key) {
            vl.push(kv.value.clone());
        } else {
            meta.insert(kv.key.clone(), vec![kv.value.clone()]);
        }
    }
    meta
}

pub fn to_pb(kvs: HashMap<String, Vec<String>>) -> protobuf::RepeatedField<KeyValue> {
    let mut meta: protobuf::RepeatedField<KeyValue> = protobuf::RepeatedField::default();
    for (k, vl) in kvs {
        for v in vl {
            let key = KeyValue {
                key: k.clone(),
                value: v.clone(),
                ..Default::default()
            };
            meta.push(key);
        }
    }
    meta
}

#[cfg(test)]
mod tests {
    use crate::context;
    use crate::ttrpc::KeyValue;

    #[test]
    fn test_metadata() {
        // RepeatedField -> HashMap, test from_pb()
        let mut src: protobuf::RepeatedField<KeyValue> = protobuf::RepeatedField::default();
        for i in &[
            ("key1", "value1-1"),
            ("key1", "value1-2"),
            ("key2", "value2"),
        ] {
            let key = KeyValue {
                key: i.0.to_string(),
                value: i.1.to_string(),
                ..Default::default()
            };
            src.push(key);
        }

        let dst = context::from_pb(&src);
        assert_eq!(dst.len(), 2);

        assert_eq!(
            dst.get("key1"),
            Some(&vec!["value1-1".to_string(), "value1-2".to_string()])
        );
        assert_eq!(dst.get("key2"), Some(&vec!["value2".to_string()]));
        assert_eq!(dst.get("key3"), None);

        // HashMap -> RepeatedField , test to_pb()
        let src = context::to_pb(dst);
        let mut kvs = src.into_vec();
        kvs.sort_by(|a, b| a.key.partial_cmp(&b.key).unwrap());

        assert_eq!(kvs.len(), 3);

        assert_eq!(kvs[0].key, "key1");
        assert_eq!(kvs[0].value, "value1-1");

        assert_eq!(kvs[1].key, "key1");
        assert_eq!(kvs[1].value, "value1-2");

        assert_eq!(kvs[2].key, "key2");
        assert_eq!(kvs[2].value, "value2");
    }

    #[test]
    fn test_context() {
        let ctx: context::Context = Default::default();
        assert_eq!(0, ctx.timeout_nano);
        assert_eq!(ctx.metadata.len(), 0);

        let mut ctx = context::with_timeout(99);
        assert_eq!(99, ctx.timeout_nano);
        assert_eq!(ctx.metadata.len(), 0);

        ctx.add("key1".to_string(), "value1-1".to_string());
        assert_eq!(ctx.metadata.len(), 1);
        assert_eq!(
            ctx.metadata.get("key1"),
            Some(&vec!["value1-1".to_string()])
        );

        ctx.add("key1".to_string(), "value1-2".to_string());
        assert_eq!(ctx.metadata.len(), 1);
        assert_eq!(
            ctx.metadata.get("key1"),
            Some(&vec!["value1-1".to_string(), "value1-2".to_string()])
        );

        ctx.set("key2".to_string(), vec!["value2".to_string()]);
        assert_eq!(ctx.metadata.len(), 2);
        assert_eq!(ctx.metadata.get("key2"), Some(&vec!["value2".to_string()]));

        ctx.set("key1".to_string(), vec![]);
        assert_eq!(ctx.metadata.len(), 1);
        assert_eq!(ctx.metadata.get("key1"), None);
    }
}