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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Sync protocol for communication between sync client and server.
// Update proto_value_conversions{.h,.cc,} if you change
// any fields in this file.
syntax = "proto2";
option optimize_for = LITE_RUNTIME;
option retain_unknown_fields = true;
package sync_pb;
import "app_list_specifics.proto";
import "app_notification_specifics.proto";
import "app_setting_specifics.proto";
import "app_specifics.proto";
import "article_specifics.proto";
import "attachments.proto";
import "autofill_specifics.proto";
import "bookmark_specifics.proto";
import "client_commands.proto";
import "client_debug_info.proto";
import "device_info_specifics.proto";
import "dictionary_specifics.proto";
import "encryption.proto";
import "experiments_specifics.proto";
import "extension_setting_specifics.proto";
import "extension_specifics.proto";
import "favicon_image_specifics.proto";
import "favicon_tracking_specifics.proto";
import "get_updates_caller_info.proto";
import "history_delete_directive_specifics.proto";
import "nigori_specifics.proto";
import "managed_user_setting_specifics.proto";
import "managed_user_shared_setting_specifics.proto";
import "managed_user_specifics.proto";
import "password_specifics.proto";
import "preference_specifics.proto";
import "priority_preference_specifics.proto";
import "search_engine_specifics.proto";
import "session_specifics.proto";
import "sync_enums.proto";
import "synced_notification_app_info_specifics.proto";
import "synced_notification_specifics.proto";
import "theme_specifics.proto";
import "typed_url_specifics.proto";
import "unique_position.proto";
// Used for inspecting how long we spent performing operations in different
// backends. All times must be in millis.
message ProfilingData {
optional int64 meta_data_write_time = 1;
optional int64 file_data_write_time = 2;
optional int64 user_lookup_time = 3;
optional int64 meta_data_read_time = 4;
optional int64 file_data_read_time = 5;
optional int64 total_request_time = 6;
message EntitySpecifics {
// If a datatype is encrypted, this field will contain the encrypted
// original EntitySpecifics. The extension for the datatype will continue
// to exist, but contain only the default values.
// Note that currently passwords employ their own legacy encryption scheme and
// do not use this field.
optional EncryptedData encrypted = 1;
// To add new datatype-specific fields to the protocol, extend
// EntitySpecifics. First, pick a non-colliding tag number by
// picking a revision number of one of your past commits
// to Then, in a different protocol buffer
// definition, define your message type, and add an optional field
// to the list below using the unique tag value you selected.
// optional MyDatatypeSpecifics my_datatype = 32222;
// where:
// - 32222 is the non-colliding tag number you picked earlier.
// - MyDatatypeSpecifics is the type (probably a message type defined
// in your new .proto file) that you want to associate with each
// object of the new datatype.
// - my_datatype is the field identifier you'll use to access the
// datatype specifics from the code.
// Server implementations are obligated to preserve the contents of
// EntitySpecifics when it contains unrecognized fields. In this
// way, it is possible to add new datatype fields without having
// to update the server.
// Note: The tag selection process is based on legacy versions of the
// protocol which used protobuf extensions. We have kept the process
// consistent as the old values cannot change. The 5+ digit nature of the
// tags also makes them recognizable (individually and collectively) from
// noise in logs and debugging contexts, and creating a divergent subset of
// tags would only make things a bit more confusing.
optional AutofillSpecifics autofill = 31729;
optional BookmarkSpecifics bookmark = 32904;
optional PreferenceSpecifics preference = 37702;
optional TypedUrlSpecifics typed_url = 40781;
optional ThemeSpecifics theme = 41210;
optional AppNotification app_notification = 45184;
optional PasswordSpecifics password = 45873;
optional NigoriSpecifics nigori = 47745;
optional ExtensionSpecifics extension = 48119;
optional AppSpecifics app = 48364;
optional SessionSpecifics session = 50119;
optional AutofillProfileSpecifics autofill_profile = 63951;
optional SearchEngineSpecifics search_engine = 88610;
optional ExtensionSettingSpecifics extension_setting = 96159;
optional AppSettingSpecifics app_setting = 103656;
optional HistoryDeleteDirectiveSpecifics history_delete_directive = 150251;
optional SyncedNotificationSpecifics synced_notification = 153108;
optional SyncedNotificationAppInfoSpecifics synced_notification_app_info =
optional DeviceInfoSpecifics device_info = 154522;
optional ExperimentsSpecifics experiments = 161496;
optional PriorityPreferenceSpecifics priority_preference = 163425;
optional DictionarySpecifics dictionary = 170540;
optional FaviconTrackingSpecifics favicon_tracking = 181534;
optional FaviconImageSpecifics favicon_image = 182019;
optional ManagedUserSettingSpecifics managed_user_setting = 186662;
optional ManagedUserSpecifics managed_user = 194582;
optional ManagedUserSharedSettingSpecifics managed_user_shared_setting =
optional ArticleSpecifics article = 223759;
optional AppListSpecifics app_list = 229170;
message SyncEntity {
// This item's identifier. In a commit of a new item, this will be a
// client-generated ID. If the commit succeeds, the server will generate
// a globally unique ID and return it to the committing client in the
// CommitResponse.EntryResponse. In the context of a GetUpdatesResponse,
// |id_string| is always the server generated ID. The original
// client-generated ID is preserved in the |originator_client_id| field.
// Present in both GetUpdatesResponse and CommitMessage.
optional string id_string = 1;
// An id referencing this item's parent in the hierarchy. In a
// CommitMessage, it is accepted for this to be a client-generated temporary
// ID if there was a new created item with that ID appearing earlier
// in the message. In all other situations, it is a server ID.
// Present in both GetUpdatesResponse and CommitMessage.
optional string parent_id_string = 2;
// old_parent_id is only set in commits and indicates the old server
// parent(s) to remove. When omitted, the old parent is the same as
// the new.
// Present only in CommitMessage.
optional string old_parent_id = 3;
// The version of this item -- a monotonically increasing value that is
// maintained by for each item. If zero in a CommitMessage, the server
// will interpret this entity as a newly-created item and generate a
// new server ID and an initial version number. If nonzero in a
// CommitMessage, this item is treated as an update to an existing item, and
// the server will use |id_string| to locate the item. Then, if the item's
// current version on the server does not match |version|, the commit will
// fail for that item. The server will not update it, and will return
// a result code of CONFLICT. In a GetUpdatesResponse, |version| is
// always positive and indentifies the revision of the item data being sent
// to the client.
// Present in both GetUpdatesResponse and CommitMessage.
required int64 version = 4;
// Last modification time (in java time milliseconds)
// Present in both GetUpdatesResponse and CommitMessage.
optional int64 mtime = 5;
// Creation time.
// Present in both GetUpdatesResponse and CommitMessage.
optional int64 ctime = 6;
// The name of this item.
// Historical note:
// Since November 2010, this value is no different from non_unique_name.
// Before then, server implementations would maintain a unique-within-parent
// value separate from its base, "non-unique" value. Clients had not
// depended on the uniqueness of the property since November 2009; it was
// removed from Chromium by .
// Present in both GetUpdatesResponse and CommitMessage.
required string name = 7;
// The name of this item. Same as |name|.
// |non_unique_name| should take precedence over the |name| value if both
// are supplied. For efficiency, clients and servers should avoid setting
// this redundant value.
// Present in both GetUpdatesResponse and CommitMessage.
optional string non_unique_name = 8;
// A value from a monotonically increasing sequence that indicates when
// this item was last updated on the server. This is now equivalent
// to version. This is now deprecated in favor of version.
// Present only in GetUpdatesResponse.
optional int64 sync_timestamp = 9;
// If present, this tag identifies this item as being a uniquely
// instanced item. The server ensures that there is never more
// than one entity in a user's store with the same tag value.
// This value is used to identify and find e.g. the "Google Chrome" settings
// folder without relying on it existing at a particular path, or having
// a particular name, in the data store.
// This variant of the tag is created by the server, so clients can't create
// an item with a tag using this field.
// Use client_defined_unique_tag if you want to create one from the client.
// An item can't have both a client_defined_unique_tag and
// a server_defined_unique_tag.
// Present only in GetUpdatesResponse.
optional string server_defined_unique_tag = 10;
// If this group is present, it implies that this SyncEntity corresponds to
// a bookmark or a bookmark folder.
// This group is deprecated; clients should use the bookmark EntitySpecifics
// protocol buffer extension instead.
optional group BookmarkData = 11 {
// We use a required field to differentiate between a bookmark and a
// bookmark folder.
// Present in both GetUpdatesMessage and CommitMessage.
required bool bookmark_folder = 12;
// For bookmark objects, contains the bookmark's URL.
// Present in both GetUpdatesResponse and CommitMessage.
optional string bookmark_url = 13;
// For bookmark objects, contains the bookmark's favicon. The favicon is
// represented as a 16X16 PNG image.
// Present in both GetUpdatesResponse and CommitMessage.
optional bytes bookmark_favicon = 14;
// Supplies a numeric position for this item, relative to other items with the
// same parent. Deprecated in M26, though clients are still required to set
// it.
// Present in both GetUpdatesResponse and CommitMessage.
// At one point this was used as an alternative / supplement to
// the deprecated |insert_after_item_id|, but now it, too, has been
// deprecated.
// In order to maintain compatibility with older clients, newer clients should
// still set this field. Its value should be based on the first 8 bytes of
// this item's |unique_position|.
// Nerwer clients must also support the receipt of items that contain
// |position_in_parent| but no |unique_position|. They should locally convert
// the given int64 position to a UniquePosition.
// The conversion from int64 to UniquePosition is as follows:
// The int64 value will have its sign bit flipped then placed in big endian
// order as the first 8 bytes of the UniquePosition. The subsequent bytes of
// the UniquePosition will consist of the item's unique suffix.
// Conversion from UniquePosition to int64 reverses this process: the first 8
// bytes of the position are to be interpreted as a big endian int64 value
// with its sign bit flipped.
optional int64 position_in_parent = 15;
// Contains the ID of the element (under the same parent) after which this
// element resides. An empty string indicates that the element is the first
// element in the parent. This value is used during commits to specify
// a relative position for a position change. In the context of
// a GetUpdatesMessage, |position_in_parent| is used instead to
// communicate position.
// Present only in CommitMessage.
// This is deprecated. Clients are allowed to omit this as long as they
// include |position_in_parent| instead.
optional string insert_after_item_id = 16;
// Arbitrary key/value pairs associated with this item.
// Present in both GetUpdatesResponse and CommitMessage.
// Deprecated.
// optional ExtendedAttributes extended_attributes = 17;
// If true, indicates that this item has been (or should be) deleted.
// Present in both GetUpdatesResponse and CommitMessage.
optional bool deleted = 18 [default = false];
// A GUID that identifies the the sync client who initially committed
// this entity. This value corresponds to |cache_guid| in CommitMessage.
// This field, along with |originator_client_item_id|, can be used to
// reunite the original with its official committed version in the case
// where a client does not receive or process the commit response for
// some reason.
// Present only in GetUpdatesResponse.
// This field is also used in determining the unique identifier used in
// bookmarks' unique_position field.
optional string originator_cache_guid = 19;
// The local item id of this entry from the client that initially
// committed this entity. Typically a negative integer.
// Present only in GetUpdatesResponse.
// This field is also used in determinging the unique identifier used in
// bookmarks' unique_position field.
optional string originator_client_item_id = 20;
// Extensible container for datatype-specific data.
// This became available in version 23 of the protocol.
optional EntitySpecifics specifics = 21;
// Indicate whether this is a folder or not. Available in version 23+.
optional bool folder = 22 [default = false];
// A client defined unique hash for this entity.
// Similar to server_defined_unique_tag.
// When initially committing an entity, a client can request that the entity
// is unique per that account. To do so, the client should specify a
// client_defined_unique_tag. At most one entity per tag value may exist.
// per account. The server will enforce uniqueness on this tag
// and fail attempts to create duplicates of this tag.
// Will be returned in any updates for this entity.
// The difference between server_defined_unique_tag and
// client_defined_unique_tag is the creator of the entity. Server defined
// tags are entities created by the server at account creation,
// while client defined tags are entities created by the client at any time.
// During GetUpdates, a sync entity update will come back with ONE of:
// a) Originator and cache id - If client committed the item as non "unique"
// b) Server tag - If server committed the item as unique
// c) Client tag - If client committed the item as unique
// May be present in CommitMessages for the initial creation of an entity.
// If present in Commit updates for the entity, it will be ignored.
// Available in version 24+.
// May be returned in GetUpdatesMessage and sent up in CommitMessage.
optional string client_defined_unique_tag = 23;
// This positioning system had a relatively short life. It was made obsolete
// by |unique_position| before either the client or server made much of an
// attempt to support it. In fact, no client ever read or set this field.
// Deprecated in M26.
optional bytes ordinal_in_parent = 24;
// This is the fourth attempt at positioning.
// This field is present in both GetUpdatesResponse and CommitMessage, if the
// item's type requires it and the client that wrote the item supports it (M26
// or higher). Clients must also be prepared to handle updates from clients
// that do not set this field. See the comments on
// |server_position_in_parent| for more information on how this is handled.
// This field will not be set for items whose type ignores positioning.
// Clients should not attempt to read this field on the receipt of an item of
// a type that ignores positioning.
// Refer to its definition in unique_position.proto for more information about
// its internal representation.
optional UniquePosition unique_position = 25;
// Attachment ids of attachments associated with this SyncEntity.
repeated AttachmentIdProto attachment_id = 26;
// This message contains diagnostic information used to correlate
// commit-related traffic with extensions-related mutations to the
// data models in chromium. It plays no functional role in
// processing this CommitMessage.
message ChromiumExtensionsActivity {
// The human-readable ID identifying the extension responsible
// for the traffic reported in this ChromiumExtensionsActivity.
optional string extension_id = 1;
// How many times the extension successfully invoked a write
// operation through the bookmarks API since the last CommitMessage.
optional uint32 bookmark_writes_since_last_commit = 2;
// Client specific configuration information.
message ClientConfigParams {
// The set of data types this client has enabled. Note that this does not
// include proxy types, as they do not have protocol field numbers and are
// placeholder types that implicitly enable protocol types.
repeated int32 enabled_type_ids = 1;
// Whether the PROXY_TABS proxy datatype is enabled on this client.
optional bool tabs_datatype_enabled = 2;
message CommitMessage {
repeated SyncEntity entries = 1;
// A GUID that identifies the committing sync client. This value will be
// returned as originator_cache_guid for any new items.
optional string cache_guid = 2;
repeated ChromiumExtensionsActivity extensions_activity = 3;
// The configuration of this client at commit time. Used by the server to
// make commit-time decisions about how to process datatypes that might
// involve server-side interaction, and e.g require explicit user intent for
// syncing a particular data type regardless of whether a commit for that
// datatype is currently being sent up.
optional ClientConfigParams config_params = 4;
// Set of optional per-client datatype contexts.
repeated DataTypeContext client_contexts = 5;
// This message communicates additional per-type information related to
// requests with origin GU_TRIGGER. This message is not relevant when any
// other origin value is used.
// Introduced in M29.
message GetUpdateTriggers {
// An opaque-to-the-client string of bytes, received through a notification,
// that the server may interpret as a hint about the location of the latest
// version of the data for this type.
// Note that this will eventually replace the 'optional' field of the same
// name defined in the progress marker, but the client and server should
// support both until it's safe to deprecate the old one.
// This field was introduced in M29.
repeated string notification_hint = 1;
// This flag is set if the client was forced to drop hints because the number
// of queued hints exceeded its limit. The oldest hints will be discarded
// first. Introduced in M29.
optional bool client_dropped_hints = 2;
// This flag is set when the client suspects that its list of invalidation
// hints may be incomplete. This may be the case if:
// - The client is syncing for the first time.
// - The client has just restarted and it was unable to keep track of
// invalidations that were received prior to the restart.
// - The client's connection to the invalidation server is currently or
// was recently broken.
// It's difficult to provide more details here. This is implemented by
// setting the flag to false whenever anything that might adversely affect
// notifications happens (eg. a crash, restart on a platform that doesn't
// support invalidation ack-tracking, transient invalidation error) and is
// unset only after we've experienced one successful sync cycle while
// notifications were enabled.
// This flag was introduced in M29.
optional bool invalidations_out_of_sync = 3;
// This counts the number of times the syncer has been asked to commit
// changes for this type since the last successful sync cycle. The number of
// nudges may not be related to the actual number of items modified. It
// often correlates with the number of user actions, but that's not always
// the case.
// Introduced in M29.
optional int64 local_modification_nudges = 4;
// This counts the number of times the syncer has been explicitly asked to
// fetch updates for this type since the last successful sync cycle. These
// explicit refresh requests should be relatively rare on most platforms, and
// associated with user actions. For example, at the time of this writing
// the most common (only?) source of refresh requests is when a user opens
// the new tab page on a platform that does not support sessions
// invalidations.
// Introduced in M29.
optional int64 datatype_refresh_nudges = 5;
// This flag is set if the invalidation server reports that it may have
// dropped some invalidations at some point. Introduced in M33.
optional bool server_dropped_hints = 6;
// This flag is set if this GetUpdate request is due at least in part due
// to the fact that this type has not finished initial sync yet, and the
// client would like to initialize itself with the server data.
// Only some types support performing an initial sync as part of a normal
// GetUpdate request. Many types must be in configure mode when fetching
// initial sync data.
// Introduced in M38.
optional bool initial_sync_in_progress = 7;
message GarbageCollectionDirective {
enum Type {
optional Type type = 1 [default = UNKNOWN];
// This field specifies the watermark for the versions which should get
// garbage collected. The client should purge all sync entities with a
// version smaller than version_watermark locally.
optional int64 version_watermark = 2;
// This field specifies the watermark in terms of age in days. The client
// should purge all sync entities which are older than this specific value
// based on last modified time.
optional int32 age_watermark_in_days = 3;
// This field specifies the max number of items that the client should keep
// for a specific datatype. If the number of items exceeds this limit, the
// client should purge the extra sync entities based on the LRU rule.
optional int32 max_number_of_items = 4;
message DataTypeProgressMarker {
// An integer identifying the data type whose progress is tracked by this
// marker. The legitimate values of this field correspond to the protobuf
// field numbers of all EntitySpecifics fields supported by the server.
// These values are externally declared in per-datatype .proto files.
optional int32 data_type_id = 1;
// An opaque-to-the-client sequence of bytes that the server may interpret
// as an indicator of the client's knowledge state. If this is empty or
// omitted by the client, it indicates that the client is initiating a
// a first-time sync of this datatype. Otherwise, clients must supply a
// value previously returned by the server in an earlier GetUpdatesResponse.
// These values are not comparable or generable on the client.
// The opaque semantics of this field are to afford server implementations
// some flexibility in implementing progress tracking. For instance,
// a server implementation built on top of a distributed storage service --
// or multiple heterogenous such services -- might need to supply a vector
// of totally ordered monotonic update timestamps, rather than a single
// monotonically increasing value. Other optimizations may also be
// possible if the server is allowed to embed arbitrary information in
// the progress token.
// Server implementations should keep the size of these tokens relatively
// small, on the order of tens of bytes, and they should remain small
// regardless of the number of items synchronized. (A possible bad server
// implementation would be for progress_token to contain a list of all the
// items ever sent to the client. Servers shouldn't do this.)
optional bytes token = 2;
// Clients that previously downloaded updates synced using the timestamp based
// progress tracking mechanism, but which wish to switch over to the opaque
// token mechanism can set this field in a GetUpdatesMessage. The server
// will perform a get updates operation as normal from the indicated
// timestamp, and return only an opaque progress token.
optional int64 timestamp_token_for_migration = 3;
// An opaque-to-the-client string of bytes, received through a notification,
// that the server may interpret as a hint about the location of the latest
// version of the data for this type.
// Deprecated in M29. We should use the repeated field version in the
// PerClientTypeState instead.
optional string notification_hint = 4;
// This field will be included only in GetUpdates with origin GU_TRIGGER.
optional GetUpdateTriggers get_update_triggers = 5;
// The garbage collection directive for this data type. The client should
// purge items locally based on this directive. Since this directive is
// designed to be sent from server only, the client should persist it locally
// as needed and avoid sending it to the server.
optional GarbageCollectionDirective gc_directive = 6;
message GetUpdatesMessage {
// Indicates the client's current progress in downloading updates. A
// from_timestamp value of zero means that the client is requesting a first-
// time sync. After that point, clients should fill in this value with the
// value returned in the last-seen GetUpdatesResponse.new_timestamp.
// from_timestamp has been deprecated; clients should use
// |from_progress_marker| instead, which allows more flexibility.
optional int64 from_timestamp = 1;
// Indicates the reason for the GetUpdatesMessage.
// Deprecated in M29. We should eventually rely on GetUpdatesOrigin instead.
// Newer clients will support both systems during the transition period.
optional GetUpdatesCallerInfo caller_info = 2;
// Indicates whether related folders should be fetched.
optional bool fetch_folders = 3 [default = true];
// The presence of an individual EntitySpecifics field indicates that the
// client requests sync object types associated with that field. This
// determination depends only on the presence of the field, not its
// contents -- thus clients should send empty messages as the field value.
// For backwards compatibility only bookmark objects will be sent to the
// client should requested_types not be present.
// requested_types may contain multiple EntitySpecifics fields -- in this
// event, the server will return items of all the indicated types.
// requested_types has been deprecated; clients should use
// |from_progress_marker| instead, which allows more flexibility.
optional EntitySpecifics requested_types = 4;
// Client-requested limit on the maximum number of updates to return at once.
// The server may opt to return fewer updates than this amount, but it should
// not return more.
optional int32 batch_size = 5;
// Per-datatype progress marker. If present, the server will ignore
// the values of requested_types and from_timestamp, using this instead.
// With the exception of certain configuration or initial sync requests, the
// client should include one instance of this field for each enabled data
// type.
repeated DataTypeProgressMarker from_progress_marker = 6;
// Indicates whether the response should be sent in chunks. This may be
// needed for devices with limited memory resources. If true, the response
// will include one or more ClientToServerResponses, with the frist one
// containing GetUpdatesMetadataResponse, and the remaining ones, if any,
// containing GetUpdatesStreamingResponse. These ClientToServerResponses are
// delimited by a length prefix, which is encoded as a varint.
optional bool streaming = 7 [default = false];
// Whether the client needs the server to provide an encryption key for this
// account.
// Note: this should typically only be set on the first GetUpdates a client
// requests. Clients are expected to persist the encryption key from then on.
// The allowed frequency for requesting encryption keys is much lower than
// other datatypes, so repeated usage will likely result in throttling.
optional bool need_encryption_key = 8 [default = false];
// Whether to create the mobile bookmarks folder if it's not
// already created. Should be set to true only by mobile clients.
optional bool create_mobile_bookmarks_folder = 1000 [default = false];
// This value is an updated version of the GetUpdatesCallerInfo's
// GetUpdatesSource. It describes the reason for the GetUpdate request.
// Introduced in M29.
optional SyncEnums.GetUpdatesOrigin get_updates_origin = 9;
// Whether this GU also serves as a retry GU. Any GU that happens after
// retry timer timeout is a retry GU effectively.
optional bool is_retry = 10 [default = false];
// Set of optional per-client datatype contexts.
repeated DataTypeContext client_contexts = 11;
message AuthenticateMessage {
required string auth_token = 1;
message ClearUserDataMessage {
message ClearUserDataResponse {
// The client must preserve, store, and resend the chip bag with
// every request. The server depends on the chip bag in order
// to precisely choreograph a client-server state machines.
// Because the client stores and sends this data on every request,
// the contents of the chip bag should be kept relatively small.
// If the server does not return a chip bag, the client must assume
// that there has been no change to the chip bag. The client must
// resend the bag of chips it had prior on the next request.
// The client must make the chip bag durable if and only if it
// processes the response from the server.
message ChipBag {
// Server chips are deliberately oqaque, allowing the server
// to encapsulate its state machine logic.
optional bytes server_chips = 1;
// Information about the syncer's state.
message ClientStatus {
// Flag to indicate if the client has detected hierarchy conflcits. The flag
// is left unset if update application has not been attempted yet.
// The server should attempt to resolve any hierarchy conflicts when this flag
// is set. The client may not assume that any particular action will be
// taken. There is no guarantee the problem will be addressed in a reasonable
// amount of time.
optional bool hierarchy_conflict_detected = 1;
// A single datatype's sync context. Allows the datatype to pass along
// datatype specific information with its own server backend.
message DataTypeContext {
// The type this context is associated with.
optional int32 data_type_id = 1;
// The context for the datatype.
optional bytes context = 2;
// The version of the context.
optional int64 version = 3;
message ClientToServerMessage {
required string share = 1;
optional int32 protocol_version = 2 [default = 34];
enum Contents {
required Contents message_contents = 3;
optional CommitMessage commit = 4;
optional GetUpdatesMessage get_updates = 5;
optional AuthenticateMessage authenticate = 6;
// Request to clear all Chromium data from the server.
optional ClearUserDataMessage clear_user_data = 9;
optional string store_birthday = 7; // Opaque store ID; if it changes, duck!
// The client sets this if it detects a sync issue. The server will tell it
// if it should perform a refresh.
optional bool sync_problem_detected = 8 [default = false];
// Client side state information for debugging purpose.
// This is only sent on the first getupdates of every sync cycle,
// as an optimization to save bandwidth.
optional DebugInfo debug_info = 10;
// Per-client state for use by the server. Sent with every message sent to the
// server.
optional ChipBag bag_of_chips = 11;
// Google API key.
optional string api_key = 12;
// Client's self-reported state.
// The client should set this on every message sent to the server, though its
// member fields may often be unset.
optional ClientStatus client_status = 13;
// The ID that our invalidation client used to identify itself to the server.
// Sending the ID here allows the server to not send notifications of our own
// changes to our invalidator.
optional string invalidator_client_id = 14;
// This request allows the client to convert a specific crash identifier
// into more general information (e.g. hash of the crashing call stack)
// suitable for upload in an (authenticated) DebugInfo event.
message GetCrashInfoRequest {
// Id of the uploaded crash.
optional string crash_id = 1;
// Time that the crash occurred.
optional int64 crash_time_millis = 2;
// Proto to be written in its entirety to the debug info log.
message GetCrashInfoResponse {
// Hash of the crashing call stack.
optional string stack_id = 1;
// Time of the crash, potentially rounded to remove
// significant bits.
optional int64 crash_time_millis = 2;
message CommitResponse {
enum ResponseType {
CONFLICT = 2; // You're out of date; update and check your data
// TODO(ncarter): What's the difference between RETRY and TRANSIENT_ERROR?
RETRY = 3; // Someone has a conflicting, non-expired session open
INVALID_MESSAGE = 4; // What the client sent was invalid, and trying again
// won't help.
OVER_QUOTA = 5; // This operation would put you, or you are, over quota
TRANSIENT_ERROR = 6; // Something went wrong; try again in a bit
repeated group EntryResponse = 1 {
required ResponseType response_type = 2;
// Sync servers may also return a new ID for an existing item, indicating
// a new entry's been created to hold the data the client's sending up.
optional string id_string = 3;
// should be filled if our parent was assigned a new ID.
optional string parent_id_string = 4;
// This value is the same as the position_in_parent value returned within
// the SyncEntity message in GetUpdatesResponse. There was a time when the
// client would attempt to honor this position, but nowadays the server
// should ensure it is no different from the position_in_parent sent up in
// the commit request and the client should not read it.
optional int64 position_in_parent = 5;
// The item's current version.
optional int64 version = 6;
// Allows the server to move-aside an entry as it's being committed.
// This name is the same as the name field returned within the SyncEntity
// message in GetUpdatesResponse.
optional string name = 7;
// This name is the same as the non_unique_name field returned within the
// SyncEntity message in GetUpdatesResponse.
optional string non_unique_name = 8;
optional string error_message = 9;
// Last modification time (in java time milliseconds). Allows the server
// to override the client-supplied mtime during a commit operation.
optional int64 mtime = 10;
message GetUpdatesResponse {
// New sync entries that the client should apply.
repeated SyncEntity entries = 1;
// If there are more changes on the server that weren't processed during this
// GetUpdates request, the client should send another GetUpdates request and
// use new_timestamp as the from_timestamp value within GetUpdatesMessage.
// This field has been deprecated and will be returned only to clients
// that set the also-deprecated |from_timestamp| field in the update request.
// Clients should use |from_progress_marker| and |new_progress_marker|
// instead.
optional int64 new_timestamp = 2;
// DEPRECATED FIELD - server does not set this anymore.
optional int64 deprecated_newest_timestamp = 3;
// Approximate count of changes remaining - use this for UI feedback.
// If present and zero, this estimate is firm: the server has no changes
// after the current batch.
optional int64 changes_remaining = 4;
// Opaque, per-datatype timestamp-like tokens. A client should use this
// field in lieu of new_timestamp, which is deprecated in newer versions
// of the protocol. Clients should retain and persist the values returned
// in this field, and present them back to the server to indicate the
// starting point for future update requests.
// This will be sent only if the client provided |from_progress_marker|
// in the update request.
// The server may provide a new progress marker even if this is the end of
// the batch, or if there were no new updates on the server; and the client
// must save these. If the server does not provide a |new_progress_marker|
// value for a particular datatype, when the request provided a
// |from_progress_marker| value for that datatype, the client should
// interpret this to mean "no change from the previous state" and retain its
// previous progress-marker value for that datatype.
// Progress markers in the context of a response will never have the
// |timestamp_token_for_migration| field set.
repeated DataTypeProgressMarker new_progress_marker = 5;
// The current encryption keys associated with this account. Will be set if
// the GetUpdatesMessage in the request had need_encryption_key == true or
// the server has updated the set of encryption keys (e.g. due to a key
// rotation).
repeated bytes encryption_keys = 6;
// Set of optional datatype contexts server mutations.
repeated DataTypeContext context_mutations = 7;
// The metadata response for GetUpdatesMessage. This response is sent when
// streaming is set to true in the request. It is prefixed with a length
// delimiter, which is encoded in varint.
message GetUpdatesMetadataResponse {
// Approximate count of changes remaining. Detailed comment is available in
// GetUpdatesResponse.
optional int64 changes_remaining = 1;
// Opaque, per-datatype timestamp-like tokens. Detailed comment is available
// in GetUpdatesResponse.
repeated DataTypeProgressMarker new_progress_marker = 2;
// The streaming response message for GetUpdatesMessage. This message is sent
// when streaming is set to true in the request. There may be multiple
// GetUpdatesStreamingResponse messages in a response. This type of messages
// is preceded by GetUpdatesMetadataResponse. It is prefixed with a length
// delimiter, which is encoded in varint.
message GetUpdatesStreamingResponse {
// New sync entries that the client should apply.
repeated SyncEntity entries = 1;
// A user-identifying struct. For a given Google account the email and display
// name can change, but obfuscated_id should be constant.
// The obfuscated id is optional because at least one planned use of the proto
// (sharing) does not require it.
message UserIdentification {
required string email = 1; // the user's full primary email address.
optional string display_name = 2; // the user's display name.
optional string obfuscated_id = 3; // an obfuscated, opaque user id.
message AuthenticateResponse {
// Optional only for backward compatibility.
optional UserIdentification user = 1;
message ThrottleParameters {
// Deprecated. Remove this from the server side.
required int32 min_measure_payload_size = 1;
required double target_utilization = 2;
required double measure_interval_max = 3;
required double measure_interval_min = 4;
required double observation_window = 5;
message ClientToServerResponse {
optional CommitResponse commit = 1;
optional GetUpdatesResponse get_updates = 2;
optional AuthenticateResponse authenticate = 3;
// Up until protocol_version 24, the default was SUCCESS which made it
// impossible to add new enum values since older clients would parse any
// out-of-range value as SUCCESS. Starting with 25, unless explicitly set,
// the error_code will be UNKNOWN so that clients know when they're
// out-of-date. Note also that when using protocol_version < 25,
// TRANSIENT_ERROR is not supported. Instead, the server sends back a HTTP
// 400 error code. This is deprecated now.
optional SyncEnums.ErrorType error_code = 4 [default = UNKNOWN];
optional string error_message = 5;
// Opaque store ID; if it changes, the contents of the client's cache
// is meaningless to this server. This happens most typically when
// you switch from one storage backend instance (say, a test instance)
// to another (say, the official instance).
optional string store_birthday = 6;
optional ClientCommand client_command = 7;
optional ProfilingData profiling_data = 8;
optional ClearUserDataResponse clear_user_data = 9;
optional GetUpdatesMetadataResponse stream_metadata = 10;
// If GetUpdatesStreamingResponse is contained in the ClientToServerResponse,
// none of the other fields (error_code and etc) will be set.
optional GetUpdatesStreamingResponse stream_data = 11;
// The data types whose storage has been migrated. Present when the value of
// error_code is MIGRATION_DONE.
repeated int32 migrated_data_type_id = 12;
message Error {
optional SyncEnums.ErrorType error_type = 1 [default = UNKNOWN];
optional string error_description = 2;
optional string url = 3;
optional SyncEnums.Action action = 4 [default = UNKNOWN_ACTION];
// Currently only meaningful if |error_type| is throttled. If this field
// is absent then the whole client (all datatypes) is throttled.
repeated int32 error_data_type_ids = 5;
optional Error error = 13;
// The new per-client state for this client. If set, should be persisted and
// sent with any subsequent ClientToServerMessages.
optional ChipBag new_bag_of_chips = 14;