lash_core/tool_registry/
state.rs

1pub const PLUGIN_TOOL_SOURCE_ID: &str = "plugins";
2
3#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
4#[serde(transparent)]
5pub struct ToolSourceHandle {
6    id: String,
7}
8
9impl ToolSourceHandle {
10    pub(crate) fn new(id: impl Into<String>) -> Self {
11        Self { id: id.into() }
12    }
13
14    pub(crate) fn as_str(&self) -> &str {
15        &self.id
16    }
17}
18
19fn is_member_default() -> bool {
20    true
21}
22
23fn is_default_member(member: &bool) -> bool {
24    *member
25}
26
27#[derive(Clone, Debug, Serialize, Deserialize)]
28pub struct ToolStateEntry {
29    manifest: ToolManifest,
30    /// True when this tool was not resolvable from any registered source at
31    /// export time (e.g. a detached MCP server). Orphaned entries keep their
32    /// last-known manifest, are excluded from the Tool Catalog (non-members
33    /// until their source returns), and rebind automatically when a source
34    /// re-advertises the same tool id.
35    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
36    orphaned: bool,
37    /// Catalog membership. Members are callable; non-members do not exist to
38    /// the model. Hosts toggle this via `set_tool_membership`.
39    #[serde(default = "is_member_default", skip_serializing_if = "is_default_member")]
40    member: bool,
41}
42
43impl ToolStateEntry {
44    #[cfg(test)]
45    pub(crate) fn new(manifest: ToolManifest) -> Self {
46        Self {
47            manifest,
48            orphaned: false,
49            member: true,
50        }
51    }
52
53    /// The stored manifest as exposed to callers.
54    pub fn manifest(&self) -> ToolManifest {
55        self.manifest.clone()
56    }
57
58    fn stored_manifest(&self) -> &ToolManifest {
59        &self.manifest
60    }
61
62    pub fn is_orphaned(&self) -> bool {
63        self.orphaned
64    }
65
66    /// Whether this entry is currently a Tool Catalog member. Orphaned entries
67    /// are never members.
68    pub fn is_member(&self) -> bool {
69        self.member && !self.orphaned
70    }
71}
72
73#[derive(Clone, Debug, Default)]
74pub struct ToolState {
75    generation: u64,
76    tools: Arc<BTreeMap<ToolId, ToolStateEntry>>,
77}
78
79impl ToolState {
80    pub(crate) fn new(generation: u64, tools: BTreeMap<ToolId, ToolStateEntry>) -> Self {
81        Self {
82            generation,
83            tools: Arc::new(tools),
84        }
85    }
86
87    pub fn generation(&self) -> u64 {
88        self.generation
89    }
90
91    pub fn with_generation(mut self, generation: u64) -> Self {
92        self.generation = generation;
93        self
94    }
95
96    /// Manifests for current Tool Catalog members. Orphaned and host-removed
97    /// entries are excluded (non-membership) but kept in state for rebind.
98    pub fn tool_manifests(&self) -> Vec<ToolManifest> {
99        self.tools
100            .values()
101            .filter(|entry| entry.is_member())
102            .map(ToolStateEntry::manifest)
103            .collect()
104    }
105
106    pub fn get(&self, id: &ToolId) -> Option<&ToolStateEntry> {
107        self.tools.get(id)
108    }
109
110    pub fn manifest_mut(&mut self, id: &ToolId) -> Option<&mut ToolManifest> {
111        Arc::make_mut(&mut self.tools)
112            .get_mut(id)
113            .map(|entry| &mut entry.manifest)
114    }
115
116    pub fn contains(&self, id: &ToolId) -> bool {
117        self.tools.contains_key(id)
118    }
119
120    pub fn is_empty(&self) -> bool {
121        self.tools.is_empty()
122    }
123
124    pub fn len(&self) -> usize {
125        self.tools.len()
126    }
127
128    pub fn iter(&self) -> impl Iterator<Item = (&ToolId, &ToolStateEntry)> {
129        self.tools.iter()
130    }
131
132    /// Toggle Tool Catalog membership for a tool. `present == false` removes
133    /// the tool from the catalog (non-membership) while keeping its state entry;
134    /// `present == true` restores membership.
135    pub fn set_membership(&mut self, id: &ToolId, present: bool) -> Result<(), ReconfigureError> {
136        let Some(entry) = Arc::make_mut(&mut self.tools).get_mut(id) else {
137            return Err(ReconfigureError::Validation(format!(
138                "unknown tool id `{id}`"
139            )));
140        };
141        entry.member = present;
142        Ok(())
143    }
144
145    pub fn retain(&mut self, mut keep: impl FnMut(&ToolId, &ToolStateEntry) -> bool) {
146        Arc::make_mut(&mut self.tools).retain(|id, entry| keep(id, entry));
147    }
148
149    pub fn remove(&mut self, id: &ToolId) -> Option<ToolStateEntry> {
150        Arc::make_mut(&mut self.tools).remove(id)
151    }
152
153    pub(crate) fn entries(&self) -> &BTreeMap<ToolId, ToolStateEntry> {
154        self.tools.as_ref()
155    }
156}
157
158impl Serialize for ToolState {
159    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
160    where
161        S: serde::Serializer,
162    {
163        #[derive(Serialize)]
164        struct ToolStateRef<'a> {
165            generation: u64,
166            tools: &'a BTreeMap<ToolId, ToolStateEntry>,
167        }
168
169        ToolStateRef {
170            generation: self.generation,
171            tools: self.tools.as_ref(),
172        }
173        .serialize(serializer)
174    }
175}
176
177impl<'de> Deserialize<'de> for ToolState {
178    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
179    where
180        D: serde::Deserializer<'de>,
181    {
182        #[derive(Deserialize)]
183        struct ToolStateOwned {
184            generation: u64,
185            tools: BTreeMap<ToolId, ToolStateEntry>,
186        }
187
188        let owned = ToolStateOwned::deserialize(deserializer)?;
189        Ok(Self {
190            generation: owned.generation,
191            tools: Arc::new(owned.tools),
192        })
193    }
194}
195
196#[async_trait::async_trait]
197pub(crate) trait ToolSourceExecutor: Send + Sync + 'static {
198    fn id(&self) -> &str;
199    fn advertised_tools(&self) -> Vec<ToolManifest>;
200    fn resolve_manifest(&self, name: &str) -> Option<ToolManifest> {
201        self.advertised_tools()
202            .into_iter()
203            .find(|manifest| manifest.name == name)
204    }
205    fn resolve_manifest_by_id(&self, id: &ToolId) -> Option<ToolManifest> {
206        self.advertised_tools()
207            .into_iter()
208            .find(|manifest| manifest.id == *id)
209    }
210    fn resolve_contract(&self, name: &str) -> Option<Arc<ToolContract>>;
211    fn resolve_contract_by_id(&self, id: &ToolId) -> Option<Arc<ToolContract>> {
212        let manifest = self.resolve_manifest_by_id(id)?;
213        self.resolve_contract(&manifest.name)
214    }
215    async fn prepare_tool_call(
216        &self,
217        call: ToolPrepareCall<'_>,
218    ) -> Result<PreparedToolCall, ToolResult> {
219        Ok(PreparedToolCall::identity(call.tool_id, call.pending))
220    }
221    async fn execute(
222        &self,
223        tool: &str,
224        args: &serde_json::Value,
225        context: &ToolContext<'_>,
226        progress: Option<&ProgressSender>,
227    ) -> ToolResult;
228    async fn execute_by_id(
229        &self,
230        tool_id: &ToolId,
231        args: &serde_json::Value,
232        context: &ToolContext<'_>,
233        progress: Option<&ProgressSender>,
234    ) -> ToolResult {
235        let Some(manifest) = self.resolve_manifest_by_id(tool_id) else {
236            return ToolResult::err_fmt(format_args!("Unknown tool id: {tool_id}"));
237        };
238        self.execute(&manifest.name, args, context, progress).await
239    }
240}
lash_core/tool_registry/state.rs

lash_core/tool_registry/
state.rs
