objtalk 0.3.0

a lightweight realtime database for IoT projects
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151

use crate::Object;
use hyper::body::Buf;
use hyper::Client;
use hyper::{Request, Response, Method, Body, StatusCode};
use serde::Serialize;
use serde_json::Value;
use thiserror::Error;

#[derive(Error, Debug)]
pub enum Error {
	#[error("http error: status code {0}")]
	HttpError(StatusCode),
	//#[error(transparent)]
	#[error("internal http error: {0}")]
	InternalHttpError(#[from] hyper::Error),
	#[error("invalid json: {0}")]
	InternalJsonError(#[from] serde_json::Error),
}

fn status_ok(res: &Response<Body>) -> Result<(), Error> {
	if res.status() != StatusCode::OK {
		Err(Error::HttpError(res.status()).into())
	} else {
		Ok(())
	}
}

#[derive(Serialize)]
struct EmitRequest {
	event: String,
	data: Value,
}

#[derive(Serialize)]
struct InvokeRequest {
	method: String,
	args: Value,
}

pub struct HttpClient {
	url: String,
}

impl HttpClient {
	pub fn new<S: Into<String>>(url: S) -> Self {
		HttpClient {
			url: url.into(),
		}
	}
	
	pub async fn get<S: Into<String>>(&self, pattern: S) -> Result<Vec<Object>, Error> {
		let client = Client::new();
		
		let url = self.url.to_owned() + "/query?pattern=" + &pattern.into(); // TODO: encodeURIComponent
		let res = client.get(url.parse().unwrap()).await?;
		status_ok(&res)?;
		
		let body = hyper::body::aggregate(res).await?;
		
		let objects = serde_json::from_reader(body.reader())?;
		
		Ok(objects)
	}
	
	pub async fn set<S: Into<String>>(&self, name: S, value: Value) -> Result<(), Error> {
		let client = Client::new();
		
		let value_json = serde_json::to_string(&value)?;
		
		let req = Request::builder()
			.method(Method::POST)
			.uri(self.url.to_owned() + "/objects/" + &name.into())
			.body(Body::from(value_json)).unwrap();
		
		let res = client.request(req).await?;
		status_ok(&res)?;
		
		Ok(())
	}
	
	pub async fn patch<S: Into<String>>(&self, name: S, value: Value) -> Result<(), Error> {
		let client = Client::new();
		
		let value_json = serde_json::to_string(&value)?;
		
		let req = Request::builder()
			.method(Method::PATCH)
			.uri(self.url.to_owned() + "/objects/" + &name.into())
			.body(Body::from(value_json)).unwrap();
		
		let res = client.request(req).await?;
		status_ok(&res)?;
		
		Ok(())
	}
	
	pub async fn remove<S: Into<String>>(&self, name: S) -> Result<bool, Error> {
		let client = Client::new();
		
		let req = Request::builder()
			.method(Method::DELETE)
			.uri(self.url.to_owned() + "/objects/" + &name.into())
			.body(Body::empty()).unwrap();
		
		let res = client.request(req).await?;
		
		match res.status() {
			StatusCode::OK => Ok(true),
			StatusCode::NOT_FOUND => Ok(false),
			_ => Err(Error::HttpError(res.status()))
		}
	}
	
	pub async fn emit<S: Into<String>, S2: Into<String>>(&self, object: S, event: S2, data: Value) -> Result<(), Error> {
		let client = Client::new();
		
		let emit_req = EmitRequest { event: event.into(), data: data.into() };
		let json = serde_json::to_string(&emit_req)?;
		
		let req = Request::builder()
			.method(Method::POST)
			.uri(self.url.to_owned() + "/events/" + &object.into())
			.body(Body::from(json)).unwrap();
		
		let res = client.request(req).await?;
		status_ok(&res)?;
		
		Ok(())
	}
	
	pub async fn invoke<S: Into<String>, S2: Into<String>>(&self, object: S, method: S2, args: Value) -> Result<Value, Error> {
		let client = Client::new();
		
		let invoke_req = InvokeRequest { method: method.into(), args: args.into() };
		let json = serde_json::to_string(&invoke_req)?;
		
		let req = Request::builder()
			.method(Method::POST)
			.uri(self.url.to_owned() + "/invoke/" + &object.into())
			.body(Body::from(json)).unwrap();
		
		let res = client.request(req).await?;
		status_ok(&res)?;
		
		let body = hyper::body::aggregate(res).await?;
		
		let result = serde_json::from_reader(body.reader())?;
		
		Ok(result)
	}
}