Protobuf DataStore

Overview

RIPDPI persists all app settings as a single Protobuf message (AppSettings) stored via Jetpack DataStore. The schema is the source of truth for all configurable values.

Key Files

File	Purpose
core/data/model/src/main/proto/app_settings.proto	Schema definition for persisted app settings
core/data/settings/src/main/kotlin/com/poyka/ripdpi/data/AppSettingsSerializer.kt	Serializer with default values
core/data/settings/src/main/kotlin/com/poyka/ripdpi/data/AppDataStore.kt	DataStore extension property
core/engine/.../core/RipDpiProxyPreferences.kt	Proto -> native preferences conversion
app/.../activities/SettingsViewModel.kt	Proto -> UI state conversion
app/.../activities/ConfigViewModel.kt	Config draft validation and persistence

Adding a New Setting

1. Add field to proto schema (app_settings.proto):

   bool your_new_setting = <next_field_number>;
   

   Use next available field number. Never reuse or renumber existing fields.

2. Set default in serializer (AppSettingsSerializer.kt):

   override val defaultValue: AppSettings = AppSettings.newBuilder()
       // ... existing defaults ...
       .setYourNewSetting(false)
       .build()
   

3. Expose in UI state (SettingsUiState or ConfigDraft):

   data class SettingsUiState(
       // ... existing fields ...
       val yourNewSetting: Boolean = false,
   )
   

4. Map in conversion function (AppSettings.toUiState() or toConfigDraft()):

   fun AppSettings.toUiState() = SettingsUiState(
       // ... existing mappings ...
       yourNewSetting = this.yourNewSetting,
   )
   

5. Persist changes via DataStore:

   context.settingsStore.updateData { current ->
       current.toBuilder().setYourNewSetting(value).build()
   }
   

Reading Settings

// Reactive (preferred): Flow<AppSettings>
context.settingsStore.data.collect { settings ->
    val value = settings.yourSetting
}

// In ViewModel: combine with other flows
val uiState = combine(application.settingsStore.data, otherFlow) { settings, other ->
    UiState(setting = settings.yourSetting, /* ... */)
}.stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), UiState())

Proto Field Groups

Group	Fields	Notes
General	app_theme, ripdpi_mode, dns_ip, ipv6_enable	Mode is "vpn" or "proxy"
Command mode	enable_cmd_settings, cmd_args	Raw CLI args for command-line mode of the native RIPDPI proxy
Proxy	proxy_ip, proxy_port, max_connections, buffer_size	Defaults: 127.0.0.1:1080
Desync	default_ttl, custom_ttl, fake_ttl, fake_sni, fake_offset, oob_data, drop_sack, etc.	desync_method and split_position are reserved/removed; grep app_settings.proto for the current field list
Protocols	desync_http, desync_https, desync_udp	Bool flags for which protocols to desync
Hosts	hosts_mode, hosts_blacklist, hosts_whitelist	Mode: disable/blacklist/whitelist
TLS	tls_minor_enabled, etc.	tlsrec_* names are reserved/removed (TLS record splitting is a desync chain step now); grep app_settings.proto for the current field list
App	onboarding_complete, biometric_enabled, backup_pin	App lifecycle settings

Preferences Conversion (Proto -> Native)

RipDpiProxyPreferences.fromSettingsStore(context) reads the proto and creates either:

• RipDpiProxyCmdPreferences(args) if enable_cmd_settings is true
• RipDpiProxyUIPreferences(...) mapping all 27 proxy parameters

Diagnostics Interaction

• enable_cmd_settings = true is a hard stop for automatic probing/audit. Those workflows require UI-config JSON so they can launch isolated strategy trials.
• If a change touches diagnostics availability or recommendation flow, also inspect core:diagnostics and the diagnostics UI layer. The proto flag alone is not the whole behavior.

Common Mistakes

Mistake	Fix
Reusing proto field numbers	Always use next available number; old numbers are reserved forever
Forgetting default in serializer	Every field needs an explicit default in AppSettingsSerializer.defaultValue
Reading DataStore on main thread	Always use Flow.collect or updateData (both suspend)
Not updating toUiState() mapping	New fields must be mapped in all conversion functions
String enums without validation	Proto stores strings ("vpn", "proxy") -- validate on read