@langchain/langgraph
Version:
LangGraph
70 lines • 2.74 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ToolExecutor = void 0;
const runnables_1 = require("@langchain/core/runnables");
const INVALID_TOOL_MSG_TEMPLATE = `{requestedToolName} is not a valid tool, try one of {availableToolNamesString}.`;
/** @deprecated Use {@link ToolNode} instead. */
class ToolExecutor extends runnables_1.RunnableBinding {
constructor(fields) {
const fieldsWithDefaults = {
invalidToolMsgTemplate: INVALID_TOOL_MSG_TEMPLATE,
...fields,
};
const bound = runnables_1.RunnableLambda.from(async (input, config) => this._execute(input, config));
super({
bound,
config: {},
});
Object.defineProperty(this, "lc_graph_name", {
enumerable: true,
configurable: true,
writable: true,
value: "ToolExecutor"
});
Object.defineProperty(this, "tools", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
Object.defineProperty(this, "toolMap", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
Object.defineProperty(this, "invalidToolMsgTemplate", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
this.tools = fieldsWithDefaults.tools;
this.invalidToolMsgTemplate = fieldsWithDefaults.invalidToolMsgTemplate;
this.toolMap = this.tools.reduce((acc, tool) => {
acc[tool.name] = tool;
return acc;
}, {});
}
/**
* Execute a tool invocation
*
* @param {ToolInvocationInterface} toolInvocation The tool to invoke and the input to pass to it.
* @param {RunnableConfig | undefined} config Optional configuration to pass to the tool when invoked.
* @returns Either the result of the tool invocation (`string` or `ToolMessage`, set by the `ToolOutput` generic) or a string error message.
*/
async _execute(toolInvocation, config) {
if (!(toolInvocation.tool in this.toolMap)) {
return this.invalidToolMsgTemplate
.replace("{requestedToolName}", toolInvocation.tool)
.replace("{availableToolNamesString}", Object.keys(this.toolMap).join(", "));
}
else {
const tool = this.toolMap[toolInvocation.tool];
const output = await tool.invoke(toolInvocation.toolInput, config);
return output;
}
}
}
exports.ToolExecutor = ToolExecutor;
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