Add server-driven parameter defaults and syncing (#16515)
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Aleksander Grygier
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GitHub
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/**
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* ParameterSyncService - Handles synchronization between server defaults and user settings
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*
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* This service manages the complex logic of merging server-provided default parameters
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* with user-configured overrides, ensuring the UI reflects the actual server state
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* while preserving user customizations.
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*
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* **Key Responsibilities:**
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* - Extract syncable parameters from server props
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* - Merge server defaults with user overrides
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* - Track parameter sources (server, user, default)
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* - Provide sync utilities for settings store integration
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*/
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import type { ApiLlamaCppServerProps } from '$lib/types/api';
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import { normalizeFloatingPoint } from '$lib/utils/precision';
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export type ParameterSource = 'default' | 'custom';
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export type ParameterValue = string | number | boolean;
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export type ParameterRecord = Record<string, ParameterValue>;
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export interface ParameterInfo {
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value: string | number | boolean;
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source: ParameterSource;
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serverDefault?: string | number | boolean;
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userOverride?: string | number | boolean;
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}
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export interface SyncableParameter {
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key: string;
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serverKey: string;
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type: 'number' | 'string' | 'boolean';
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canSync: boolean;
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}
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/**
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* Mapping of webui setting keys to server parameter keys
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* Only parameters that should be synced from server are included
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*/
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export const SYNCABLE_PARAMETERS: SyncableParameter[] = [
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{ key: 'temperature', serverKey: 'temperature', type: 'number', canSync: true },
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{ key: 'top_k', serverKey: 'top_k', type: 'number', canSync: true },
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{ key: 'top_p', serverKey: 'top_p', type: 'number', canSync: true },
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{ key: 'min_p', serverKey: 'min_p', type: 'number', canSync: true },
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{ key: 'dynatemp_range', serverKey: 'dynatemp_range', type: 'number', canSync: true },
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{ key: 'dynatemp_exponent', serverKey: 'dynatemp_exponent', type: 'number', canSync: true },
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{ key: 'xtc_probability', serverKey: 'xtc_probability', type: 'number', canSync: true },
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{ key: 'xtc_threshold', serverKey: 'xtc_threshold', type: 'number', canSync: true },
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{ key: 'typ_p', serverKey: 'typ_p', type: 'number', canSync: true },
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{ key: 'repeat_last_n', serverKey: 'repeat_last_n', type: 'number', canSync: true },
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{ key: 'repeat_penalty', serverKey: 'repeat_penalty', type: 'number', canSync: true },
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{ key: 'presence_penalty', serverKey: 'presence_penalty', type: 'number', canSync: true },
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{ key: 'frequency_penalty', serverKey: 'frequency_penalty', type: 'number', canSync: true },
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{ key: 'dry_multiplier', serverKey: 'dry_multiplier', type: 'number', canSync: true },
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{ key: 'dry_base', serverKey: 'dry_base', type: 'number', canSync: true },
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{ key: 'dry_allowed_length', serverKey: 'dry_allowed_length', type: 'number', canSync: true },
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{ key: 'dry_penalty_last_n', serverKey: 'dry_penalty_last_n', type: 'number', canSync: true },
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{ key: 'max_tokens', serverKey: 'max_tokens', type: 'number', canSync: true },
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{ key: 'samplers', serverKey: 'samplers', type: 'string', canSync: true }
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];
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export class ParameterSyncService {
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/**
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* Round floating-point numbers to avoid JavaScript precision issues
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*/
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private static roundFloatingPoint(value: ParameterValue): ParameterValue {
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return normalizeFloatingPoint(value) as ParameterValue;
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}
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/**
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* Extract server default parameters that can be synced
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*/
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static extractServerDefaults(
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serverParams: ApiLlamaCppServerProps['default_generation_settings']['params'] | null
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): ParameterRecord {
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if (!serverParams) return {};
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const extracted: ParameterRecord = {};
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for (const param of SYNCABLE_PARAMETERS) {
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if (param.canSync && param.serverKey in serverParams) {
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const value = (serverParams as unknown as Record<string, ParameterValue>)[param.serverKey];
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if (value !== undefined) {
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// Apply precision rounding to avoid JavaScript floating-point issues
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extracted[param.key] = this.roundFloatingPoint(value);
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}
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}
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}
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// Handle samplers array conversion to string
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if (serverParams.samplers && Array.isArray(serverParams.samplers)) {
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extracted.samplers = serverParams.samplers.join(';');
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}
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return extracted;
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}
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/**
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* Merge server defaults with current user settings
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* Returns updated settings that respect user overrides while using server defaults
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*/
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static mergeWithServerDefaults(
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currentSettings: ParameterRecord,
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serverDefaults: ParameterRecord,
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userOverrides: Set<string> = new Set()
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): ParameterRecord {
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const merged = { ...currentSettings };
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for (const [key, serverValue] of Object.entries(serverDefaults)) {
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// Only update if user hasn't explicitly overridden this parameter
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if (!userOverrides.has(key)) {
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merged[key] = this.roundFloatingPoint(serverValue);
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}
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}
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return merged;
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}
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/**
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* Get parameter information including source and values
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*/
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static getParameterInfo(
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key: string,
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currentValue: ParameterValue,
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propsDefaults: ParameterRecord,
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userOverrides: Set<string>
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): ParameterInfo {
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const hasPropsDefault = propsDefaults[key] !== undefined;
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const isUserOverride = userOverrides.has(key);
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// Simple logic: either using default (from props) or custom (user override)
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const source: ParameterSource = isUserOverride ? 'custom' : 'default';
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return {
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value: currentValue,
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source,
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serverDefault: hasPropsDefault ? propsDefaults[key] : undefined, // Keep same field name for compatibility
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userOverride: isUserOverride ? currentValue : undefined
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};
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}
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/**
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* Check if a parameter can be synced from server
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*/
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static canSyncParameter(key: string): boolean {
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return SYNCABLE_PARAMETERS.some((param) => param.key === key && param.canSync);
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}
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/**
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* Get all syncable parameter keys
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*/
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static getSyncableParameterKeys(): string[] {
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return SYNCABLE_PARAMETERS.filter((param) => param.canSync).map((param) => param.key);
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}
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/**
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* Validate server parameter value
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*/
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static validateServerParameter(key: string, value: ParameterValue): boolean {
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const param = SYNCABLE_PARAMETERS.find((p) => p.key === key);
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if (!param) return false;
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switch (param.type) {
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case 'number':
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return typeof value === 'number' && !isNaN(value);
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case 'string':
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return typeof value === 'string';
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case 'boolean':
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return typeof value === 'boolean';
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default:
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return false;
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}
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}
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/**
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* Create a diff between current settings and server defaults
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*/
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static createParameterDiff(
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currentSettings: ParameterRecord,
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serverDefaults: ParameterRecord
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): Record<string, { current: ParameterValue; server: ParameterValue; differs: boolean }> {
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const diff: Record<
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string,
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{ current: ParameterValue; server: ParameterValue; differs: boolean }
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> = {};
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for (const key of this.getSyncableParameterKeys()) {
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const currentValue = currentSettings[key];
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const serverValue = serverDefaults[key];
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if (serverValue !== undefined) {
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diff[key] = {
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current: currentValue,
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server: serverValue,
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differs: currentValue !== serverValue
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};
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}
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}
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return diff;
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}
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}
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