rapids 0.4.0

A WIP implementation of https://github.com/replit/river in rust
Documentation 
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

use std::sync::atomic::{AtomicI64, Ordering};

use kanal::{AsyncReceiver, AsyncSender};

use rapids::types::{IncomingMessage, OutgoingMessage, RPCMetadata};

use super::ServiceImpl;
use anyhow::format_err;

pub struct Service {
    state: AtomicI64,
}

impl ServiceImpl for Service {
    async fn new() -> anyhow::Result<Service> {
        Ok(Service {
            state: AtomicI64::new(0),
        })
    }
}

impl Service {
    pub async fn add(
        &self,
        payload: serde_json::Value,
        _metadata: &RPCMetadata,
    ) -> anyhow::Result<serde_json::Value> {
        let amt = payload
            .as_object()
            .unwrap()
            .get("n")
            .unwrap()
            .as_i64()
            .unwrap();

        let res = self.state.fetch_add(amt, Ordering::SeqCst) + amt;

        let return_payload = serde_json::json!({"result": res });
        if amt == 6 {
            return Err(format_err!("test"));
        }

        Ok(return_payload)
    }

    pub async fn reset_count(
        &self,
        payload: serde_json::Value,
        _metadata: &RPCMetadata,
    ) -> anyhow::Result<serde_json::Value> {
        let amt = payload.as_number().unwrap().as_i64().unwrap();

        self.state.store(amt, Ordering::SeqCst);

        let return_payload = serde_json::json!(null);

        Ok(return_payload)
    }

    pub async fn upload_add(
        &self,
        _: serde_json::Value,
        recv: AsyncReceiver<IncomingMessage>,
        _metadata: &RPCMetadata,
    ) -> anyhow::Result<serde_json::Value> {
        // TODO: deal with force close
        while let Ok(IncomingMessage::Request(value)) = recv.recv().await {
            let amt = value
                .as_object()
                .unwrap()
                .get("n")
                .unwrap()
                .as_i64()
                .unwrap();

            self.state.fetch_add(amt, Ordering::SeqCst);
        }

        let result = self.state.load(Ordering::SeqCst);

        let return_payload = serde_json::json!({ "result": result });

        Ok(return_payload)
    }

    pub async fn stream_add(
        &self,
        _: serde_json::Value,
        recv: AsyncReceiver<IncomingMessage>,
        send: AsyncSender<OutgoingMessage>,
        metadata: &RPCMetadata,
    ) -> anyhow::Result<()> {
        // TODO: deal with force close
        while let Ok(IncomingMessage::Request(value)) = recv.recv().await {
            let amt = value
                .as_object()
                .unwrap()
                .get("n")
                .unwrap()
                .as_i64()
                .unwrap();

            let res = self.state.fetch_add(amt, Ordering::SeqCst) + amt;

            Self::send_payload(send.clone(), serde_json::json!({ "result": res }), metadata)
                .await?;
        }

        Ok(())
    }

    pub async fn subscription_add(
        &self,
        payload: serde_json::Value,
        send: AsyncSender<OutgoingMessage>,
        metadata: &RPCMetadata,
    ) -> anyhow::Result<()> {
        let amts = payload.as_array().unwrap();

        for amt in amts {
            let amt = amt.as_i64().unwrap();
            let res = self.state.fetch_add(amt, Ordering::SeqCst) + amt;

            Self::send_payload(send.clone(), serde_json::json!({ "result": res }), metadata)
                .await?;
        }

        Ok(())
    }
}