orion-server 0.1.0

Declarative services runtime powered by dataflow-rs
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

use std::sync::Arc;
use std::time::Duration;

use async_trait::async_trait;
use dataflow_rs::engine::error::DataflowError;
use dataflow_rs::engine::functions::AsyncFunctionHandler;
use dataflow_rs::engine::functions::config::FunctionConfig;
use dataflow_rs::engine::message::{Change, Message};
use datalogic_rs::DataLogic;
use serde_json::Value;

use super::http_common::{self, build_url, get_nested, set_nested};
use crate::connector::{ConnectorConfig, ConnectorRegistry};

/// Executes HTTP requests against named connectors with retry support.
pub struct HttpCallHandler {
    pub registry: Arc<ConnectorRegistry>,
    pub client: reqwest::Client,
}

#[async_trait]
impl AsyncFunctionHandler for HttpCallHandler {
    async fn execute(
        &self,
        message: &mut Message,
        config: &FunctionConfig,
        datalogic: Arc<DataLogic>,
    ) -> dataflow_rs::Result<(usize, Vec<Change>)> {
        let input = match config {
            FunctionConfig::HttpCall { input, .. } => input,
            _ => return Err(DataflowError::Validation("Expected HttpCall config".into())),
        };

        // Resolve connector
        let connector_config = self.registry.get(&input.connector).await.ok_or_else(|| {
            DataflowError::function_execution(
                format!("Connector '{}' not found", input.connector),
                None,
            )
        })?;

        let http_config = match connector_config.as_ref() {
            ConnectorConfig::Http(c) => c,
            _ => {
                return Err(DataflowError::Validation(format!(
                    "Connector '{}' is not an HTTP connector",
                    input.connector
                )));
            }
        };

        // Build URL
        let path = super::resolve_path(&input.path, &input.path_logic, message, &datalogic)?;
        let url = build_url(&http_config.url, path.as_deref());

        // Build method
        let method = super::to_reqwest_method(&input.method);

        // Build body
        let body = resolve_body(&input.body, &input.body_logic, message, &datalogic)?;

        // Timeout
        let timeout = Duration::from_millis(input.timeout_ms);

        // Execute with retry (+ circuit breaker if enabled)
        let retry_config = &http_config.retry;
        let response_body = if self.registry.circuit_breaker_enabled() {
            let channel = super::extract_channel(message);
            let key = format!("{}:{}", channel, input.connector);
            let breaker = self.registry.get_or_create_breaker(&key).await;
            super::execute_with_circuit_breaker(
                &breaker,
                &input.connector,
                channel,
                retry_config.max_retries,
                retry_config.retry_delay_ms,
                "HTTP call",
                || {
                    http_common::execute_request(
                        &self.client,
                        &method,
                        &url,
                        Some(&input.headers),
                        http_config,
                        body.as_ref(),
                        timeout,
                    )
                },
            )
            .await?
        } else {
            super::retry_with_backoff(
                retry_config.max_retries,
                retry_config.retry_delay_ms,
                "HTTP call",
                || {
                    http_common::execute_request(
                        &self.client,
                        &method,
                        &url,
                        Some(&input.headers),
                        http_config,
                        body.as_ref(),
                        timeout,
                    )
                },
            )
            .await?
        };

        // Store response at response_path
        let mut changes = Vec::new();
        if let Some(ref response_path) = input.response_path {
            let old_value = get_nested(&message.context, response_path);
            set_nested(&mut message.context, response_path, response_body.clone());
            message.invalidate_context_cache();

            changes.push(Change {
                path: Arc::from(response_path.as_str()),
                old_value: Arc::new(old_value),
                new_value: Arc::new(response_body),
            });
        }

        Ok((200, changes))
    }
}

fn resolve_body(
    static_body: &Option<Value>,
    body_logic: &Option<Value>,
    message: &mut Message,
    datalogic: &DataLogic,
) -> dataflow_rs::Result<Option<Value>> {
    if let Some(logic) = body_logic {
        let context = message.get_context_arc();
        let compiled = datalogic
            .compile(logic)
            .map_err(|e| DataflowError::LogicEvaluation(e.to_string()))?;
        let result = datalogic
            .evaluate(&compiled, context)
            .map_err(|e| DataflowError::LogicEvaluation(e.to_string()))?;
        Ok(Some(result))
    } else {
        Ok(static_body.clone())
    }
}