Upintegrate the common_time service from ics-aah.
Move the common_time service developed in the ics-aah branch back into
master.
The common_time service is a small service build to synchronize an
arbitrary timeline amongst peers on a local sub-net. While running
and configured, the service will elect a master from the set of
available devices within the subnet, define a relationship between the
common_time timeline the local time timeline (provided by the local
time HAL), and then attempt to maintain synchronization between common
and local time by controlling the frequency of the local time clock
via the HAL, or by disciplining local time in the digital domain if
the local time HAL implementation does not support HW slewing.
On its own, the native common time service will do nothing until it is
configured. The CommonTimeManagementService (running out of the
system server process) is responsible for implementing policy
regarding configuration and operation of the common_time service and
will be added in a subsequent CL.
Change-Id: I71292f9b9b1797665865689c4572c9d3a0552f64
Signed-off-by: John Grossman <johngro@google.com>
diff --git a/services/common_time/common_time_server_packets.cpp b/services/common_time/common_time_server_packets.cpp
new file mode 100644
index 0000000..9833c37
--- /dev/null
+++ b/services/common_time/common_time_server_packets.cpp
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * A service that exchanges time synchronization information between
+ * a master that defines a timeline and clients that follow the timeline.
+ */
+
+#define LOG_TAG "common_time"
+#include <utils/Log.h>
+
+#include <arpa/inet.h>
+#include <stdint.h>
+
+#include "common_time_server_packets.h"
+
+namespace android {
+
+const uint32_t TimeServicePacketHeader::kMagic =
+ (static_cast<uint32_t>('c') << 24) |
+ (static_cast<uint32_t>('c') << 16) |
+ (static_cast<uint32_t>('l') << 8) |
+ static_cast<uint32_t>('k');
+
+const uint16_t TimeServicePacketHeader::kCurVersion = 1;
+
+#define SERIALIZE_FIELD(field_name, type, converter) \
+ do { \
+ if ((offset + sizeof(field_name)) > length) \
+ return -1; \
+ *((type*)(data + offset)) = converter(field_name); \
+ offset += sizeof(field_name); \
+ } while (0)
+#define SERIALIZE_INT16(field_name) SERIALIZE_FIELD(field_name, int16_t, htons)
+#define SERIALIZE_INT32(field_name) SERIALIZE_FIELD(field_name, int32_t, htonl)
+#define SERIALIZE_INT64(field_name) SERIALIZE_FIELD(field_name, int64_t, htonq)
+
+#define DESERIALIZE_FIELD(field_name, type, converter) \
+ do { \
+ if ((offset + sizeof(field_name)) > length) \
+ return -1; \
+ field_name = converter(*((type*)(data + offset))); \
+ offset += sizeof(field_name); \
+ } while (0)
+#define DESERIALIZE_INT16(field_name) DESERIALIZE_FIELD(field_name, int16_t, ntohs)
+#define DESERIALIZE_INT32(field_name) DESERIALIZE_FIELD(field_name, int32_t, ntohl)
+#define DESERIALIZE_INT64(field_name) DESERIALIZE_FIELD(field_name, int64_t, ntohq)
+
+#define kDevicePriorityShift 56
+#define kDeviceIDMask ((static_cast<uint64_t>(1) << kDevicePriorityShift) - 1)
+
+inline uint64_t packDeviceID(uint64_t devID, uint8_t prio) {
+ return (devID & kDeviceIDMask) |
+ (static_cast<uint64_t>(prio) << kDevicePriorityShift);
+}
+
+inline uint64_t unpackDeviceID(uint64_t packed) {
+ return (packed & kDeviceIDMask);
+}
+
+inline uint8_t unpackDevicePriority(uint64_t packed) {
+ return static_cast<uint8_t>(packed >> kDevicePriorityShift);
+}
+
+ssize_t TimeServicePacketHeader::serializeHeader(uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = 0;
+ int16_t pktType = static_cast<int16_t>(packetType);
+ SERIALIZE_INT32(magic);
+ SERIALIZE_INT16(version);
+ SERIALIZE_INT16(pktType);
+ SERIALIZE_INT64(timelineID);
+ SERIALIZE_INT64(syncGroupID);
+ return offset;
+}
+
+ssize_t TimeServicePacketHeader::deserializeHeader(const uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = 0;
+ int16_t tmp;
+ DESERIALIZE_INT32(magic);
+ DESERIALIZE_INT16(version);
+ DESERIALIZE_INT16(tmp);
+ DESERIALIZE_INT64(timelineID);
+ DESERIALIZE_INT64(syncGroupID);
+ packetType = static_cast<TimeServicePacketType>(tmp);
+ return offset;
+}
+
+ssize_t TimeServicePacketHeader::serializePacket(uint8_t* data,
+ uint32_t length) {
+ ssize_t ret, tmp;
+
+ ret = serializeHeader(data, length);
+ if (ret < 0)
+ return ret;
+
+ data += ret;
+ length -= ret;
+
+ switch (packetType) {
+ case TIME_PACKET_WHO_IS_MASTER_REQUEST:
+ tmp =((WhoIsMasterRequestPacket*)(this))->serializePacket(data,
+ length);
+ break;
+ case TIME_PACKET_WHO_IS_MASTER_RESPONSE:
+ tmp =((WhoIsMasterResponsePacket*)(this))->serializePacket(data,
+ length);
+ break;
+ case TIME_PACKET_SYNC_REQUEST:
+ tmp =((SyncRequestPacket*)(this))->serializePacket(data, length);
+ break;
+ case TIME_PACKET_SYNC_RESPONSE:
+ tmp =((SyncResponsePacket*)(this))->serializePacket(data, length);
+ break;
+ case TIME_PACKET_MASTER_ANNOUNCEMENT:
+ tmp =((MasterAnnouncementPacket*)(this))->serializePacket(data,
+ length);
+ break;
+ default:
+ return -1;
+ }
+
+ if (tmp < 0)
+ return tmp;
+
+ return ret + tmp;
+}
+
+ssize_t UniversalTimeServicePacket::deserializePacket(
+ const uint8_t* data,
+ uint32_t length,
+ uint64_t expectedSyncGroupID) {
+ ssize_t ret;
+ TimeServicePacketHeader* header;
+ if (length < 8)
+ return -1;
+
+ packetType = ntohs(*((uint16_t*)(data + 6)));
+ switch (packetType) {
+ case TIME_PACKET_WHO_IS_MASTER_REQUEST:
+ ret = p.who_is_master_request.deserializePacket(data, length);
+ header = &p.who_is_master_request;
+ break;
+ case TIME_PACKET_WHO_IS_MASTER_RESPONSE:
+ ret = p.who_is_master_response.deserializePacket(data, length);
+ header = &p.who_is_master_response;
+ break;
+ case TIME_PACKET_SYNC_REQUEST:
+ ret = p.sync_request.deserializePacket(data, length);
+ header = &p.sync_request;
+ break;
+ case TIME_PACKET_SYNC_RESPONSE:
+ ret = p.sync_response.deserializePacket(data, length);
+ header = &p.sync_response;
+ break;
+ case TIME_PACKET_MASTER_ANNOUNCEMENT:
+ ret = p.master_announcement.deserializePacket(data, length);
+ header = &p.master_announcement;
+ break;
+ default:
+ return -1;
+ }
+
+ if ((ret >= 0) && !header->checkPacket(expectedSyncGroupID))
+ ret = -1;
+
+ return ret;
+}
+
+ssize_t WhoIsMasterRequestPacket::serializePacket(uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = serializeHeader(data, length);
+ if (offset > 0) {
+ uint64_t packed = packDeviceID(senderDeviceID, senderDevicePriority);
+ SERIALIZE_INT64(packed);
+ }
+ return offset;
+}
+
+ssize_t WhoIsMasterRequestPacket::deserializePacket(const uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = deserializeHeader(data, length);
+ if (offset > 0) {
+ uint64_t packed;
+ DESERIALIZE_INT64(packed);
+ senderDeviceID = unpackDeviceID(packed);
+ senderDevicePriority = unpackDevicePriority(packed);
+ }
+ return offset;
+}
+
+ssize_t WhoIsMasterResponsePacket::serializePacket(uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = serializeHeader(data, length);
+ if (offset > 0) {
+ uint64_t packed = packDeviceID(deviceID, devicePriority);
+ SERIALIZE_INT64(packed);
+ }
+ return offset;
+}
+
+ssize_t WhoIsMasterResponsePacket::deserializePacket(const uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = deserializeHeader(data, length);
+ if (offset > 0) {
+ uint64_t packed;
+ DESERIALIZE_INT64(packed);
+ deviceID = unpackDeviceID(packed);
+ devicePriority = unpackDevicePriority(packed);
+ }
+ return offset;
+}
+
+ssize_t SyncRequestPacket::serializePacket(uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = serializeHeader(data, length);
+ if (offset > 0) {
+ SERIALIZE_INT64(clientTxLocalTime);
+ }
+ return offset;
+}
+
+ssize_t SyncRequestPacket::deserializePacket(const uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = deserializeHeader(data, length);
+ if (offset > 0) {
+ DESERIALIZE_INT64(clientTxLocalTime);
+ }
+ return offset;
+}
+
+ssize_t SyncResponsePacket::serializePacket(uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = serializeHeader(data, length);
+ if (offset > 0) {
+ SERIALIZE_INT64(clientTxLocalTime);
+ SERIALIZE_INT64(masterRxCommonTime);
+ SERIALIZE_INT64(masterTxCommonTime);
+ SERIALIZE_INT32(nak);
+ }
+ return offset;
+}
+
+ssize_t SyncResponsePacket::deserializePacket(const uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = deserializeHeader(data, length);
+ if (offset > 0) {
+ DESERIALIZE_INT64(clientTxLocalTime);
+ DESERIALIZE_INT64(masterRxCommonTime);
+ DESERIALIZE_INT64(masterTxCommonTime);
+ DESERIALIZE_INT32(nak);
+ }
+ return offset;
+}
+
+ssize_t MasterAnnouncementPacket::serializePacket(uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = serializeHeader(data, length);
+ if (offset > 0) {
+ uint64_t packed = packDeviceID(deviceID, devicePriority);
+ SERIALIZE_INT64(packed);
+ }
+ return offset;
+}
+
+ssize_t MasterAnnouncementPacket::deserializePacket(const uint8_t* data,
+ uint32_t length) {
+ ssize_t offset = deserializeHeader(data, length);
+ if (offset > 0) {
+ uint64_t packed;
+ DESERIALIZE_INT64(packed);
+ deviceID = unpackDeviceID(packed);
+ devicePriority = unpackDevicePriority(packed);
+ }
+ return offset;
+}
+
+} // namespace android
+