harmos-runtime 0.1.4

Harmos runtime: managed state, undo, recovery, background work and typed streams.
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

/* ***
 *
 * Harmos
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * ***
 */

/* === Modules === */

/* === Re-Exports === */

/* === Imports === */

// Standard Library Imports

// Third Party Imports

// Local Imports
use super::*;

/* === Constants === */

/* === Macros === */

/* === Type Aliases === */

/* === Structs === */

/* === Enums === */

/* === Traits === */

/* === Implementations === */

impl OperationManager {
    #[cfg(any(feature = "plugin", feature = "plugin-guest", feature = "plugin-sidecar"))]
    pub fn validate_requirements(&self, candidate: &crate::plugin::PluginDefinitions) -> Result<()> {
        let state = self.registry.state.lock().expect("operation registry lock is healthy");
        for (definition, required) in candidate.host_requirements() {
            let id = required.contract.operation().id.as_str();
            let selected = state.host_provider(id, &required.contract).map_err(|error| match error {
                Error::NotRegistered { domain, .. } => Error::NotRegistered { domain, name: format!("{}/{id}", definition.id) },
                other => other,
            })?;
            selected.available()?;
        }
        Ok(())
    }

    pub(in crate::operations) fn reserve(&self, entries: &[Arc<Entry>]) -> Result<()> {
        #[cfg(feature = "grpc")]
        for entry in entries {
            let Some(contract) = &entry.contract else {
                continue;
            };
            let Some(binding) = contract.grpc() else {
                continue;
            };
            crate::grpc::descriptor(&binding.package, &binding.service, &[(&binding.method, contract)])
                .map_err(|source| Error::OperationFailed { operation: entry.id().to_owned(), source: Arc::new(source) })?;
        }
        let (result, retired) = {
            let mut state = self.registry.state.lock().expect("operation registry lock is healthy");
            let retired = state.retired();
            let result = if state.closing || !self.instances.is_accepting() {
                Err(Error::Closing { domain: "operations" })
            } else if let Some(entry) = entries.iter().find(|entry| state.owned(entry.id(), entry.owner.as_str()).is_some()) {
                Err(Error::AlreadyRegistered { domain: "operation", name: entry.id().to_owned() })
            } else {
                #[cfg(any(feature = "plugin", feature = "plugin-guest", feature = "plugin-sidecar"))]
                let gate = entries.iter().find_map(|entry| entry.plugin.as_ref()).map_or(Ok(()), |scope| {
                    if scope.is_closed() {
                        Err(Error::Closing { domain: "plugin scope" })
                    } else if scope.has_committed() {
                        Err(Error::InvalidInput { field: "operation catalog", reason: "plugin generation is already committed" })
                    } else {
                        Ok(())
                    }
                });
                #[cfg(not(any(feature = "plugin", feature = "plugin-guest", feature = "plugin-sidecar")))]
                let gate: Result<()> = Ok(());
                #[cfg(feature = "grpc")]
                let gate = gate.and_then(|()| {
                    let mut staged = BTreeMap::new();
                    for entry in entries {
                        let Some(binding) = entry.contract.as_ref().and_then(|contract| contract.grpc()) else {
                            continue;
                        };
                        let path = binding.path();
                        if state.grpc_services.contains(&format!("{}.{}", binding.package, binding.service))
                            || state.grpc.get(&path).and_then(Weak::upgrade).is_some()
                            || staged.insert(path.clone(), Arc::downgrade(entry)).is_some()
                        {
                            return Err(Error::AlreadyRegistered { domain: "gRPC method", name: path });
                        }
                    }
                    state.grpc.extend(staged);
                    Ok(())
                });
                if gate.is_ok() {
                    for entry in entries {
                        state.entries.entry(entry.id().to_owned()).or_default().insert(entry.owner.to_string(), Arc::clone(entry));
                    }
                }
                gate
            };
            (result, retired)
        };
        // Resource owners removed by opportunistic retirement never drop under a registry guard.
        drop(retired);
        result
    }
}

/* === Public Functions === */

/* === Private Functions === */

/* === Tests === */