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skybroker.c
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/*
* Copyright (C) 2021-2022 Skycharge GmbH
* Author: Roman Penyaev <r.peniaev@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <endian.h>
#include <limits.h>
#include <string.h>
#include <uuid/uuid.h>
#include <czmq.h>
#include <mongoc.h>
#include "skybroker-cmd.h"
#include "daemon.h"
#include "version.h"
#include "skyproto.h"
#include "libskycharge.h"
#include "libskycharge-pri.h"
struct server_peer {
zmsg_t *idents_msg;
zframe_t *data_frame;
uuid_t devuuid;
const void *rsp_data;
struct sky_dev_desc *devdesc;
size_t rsp_len;
size_t num_devs;
size_t info_off;
bool dyn_info;
union {
unsigned long long expires_at;
struct server_peer *next;
};
};
struct db {
mongoc_uri_t *uri;
mongoc_client_pool_t *pool;
};
struct db_client {
mongoc_client_pool_t *pool;
mongoc_client_t *client;
mongoc_database_t *db;
mongoc_collection_t *coll_chargers;
mongoc_collection_t *coll_user_uuids;
mongoc_collection_t *coll_charging_sessions;
};
static pthread_mutex_t hash_lock = PTHREAD_MUTEX_INITIALIZER;
static int db_init(struct cli *cli, struct db *db)
{
bson_error_t error;
/*
* Init mongodb
*/
mongoc_init ();
db->uri = mongoc_uri_new_with_error(cli->dburi, &error);
if (!db->uri) {
sky_err("failed to parse URI: %s\n"
"error message: %s\n",
cli->dburi,
error.message);
return -1;
}
/*
* Create a new pool and client instance
*/
db->pool = mongoc_client_pool_new(db->uri);
if (!db->pool) {
sky_err("mongoc_client_pool_new(): failed\n");
mongoc_uri_destroy(db->uri);
return -1;
}
mongoc_client_pool_set_error_api(db->pool, 2);
mongoc_client_pool_set_appname(db->pool, "skybroker");
return 0;
}
static void db_deinit(struct db *db)
{
mongoc_client_pool_destroy(db->pool);
mongoc_uri_destroy(db->uri);
mongoc_cleanup();
}
static int
db_client_connect(struct db *db, struct db_client *db_client)
{
db_client->client = mongoc_client_pool_pop(db->pool);
if (!db_client->client) {
sky_err("mongoc_client_pool_pop(): failed\n");
return -1;
}
db_client->db = mongoc_client_get_database(db_client->client,
"skycharge_db");
if (!db_client->db) {
sky_err("mongoc_client_get_database(): failed\n");
goto err_push_pool;
}
db_client->coll_chargers =
mongoc_database_get_collection(db_client->db, "chargers");
if (!db_client->coll_chargers) {
sky_err("mongoc_database_get_collection(): failed\n");
goto err_database_destroy;
}
db_client->coll_user_uuids =
mongoc_database_get_collection(db_client->db, "userUUIDS");
if (!db_client->coll_user_uuids) {
sky_err("mongoc_database_get_collection(): failed\n");
goto err_coll_chargers_destroy;
}
db_client->coll_charging_sessions =
mongoc_database_get_collection(db_client->db, "chargingSessions");
if (!db_client->coll_charging_sessions) {
sky_err("mongoc_database_get_collection(): failed\n");
goto err_coll_user_uuids_destroy;
}
db_client->pool = db->pool;
return 0;
err_coll_user_uuids_destroy:
mongoc_collection_destroy(db_client->coll_charging_sessions);
err_coll_chargers_destroy:
mongoc_collection_destroy(db_client->coll_chargers);
err_database_destroy:
mongoc_database_destroy(db_client->db);
err_push_pool:
mongoc_client_pool_push(db->pool, db_client->client);
return -1;
}
static void db_client_disconnect(struct db_client *db_client)
{
mongoc_collection_destroy(db_client->coll_charging_sessions);
mongoc_collection_destroy(db_client->coll_chargers);
mongoc_collection_destroy(db_client->coll_user_uuids);
mongoc_database_destroy(db_client->db);
mongoc_client_pool_push(db_client->pool, db_client->client);
}
static bool
db_lookup_and_update_device_by_devuuid(struct db_client *db_client,
const struct sky_dev_desc *devdesc,
bool only_ts)
{
mongoc_find_and_modify_opts_t *opts;
bson_iter_t iter, citer;
bson_t *query;
bson_t *update;
bson_t reply;
char devuuid_str[37];
bool success;
uuid_unparse(devdesc->dev_uuid, devuuid_str);
query = BCON_NEW("deviceId", BCON_UTF8(devuuid_str));
if (!only_ts) {
char plc_proto_ver_str[16];
char proto_ver_str[16];
char fw_ver_str[16];
char hw_ver_str[16];
char uid_str[32];
snprintf(proto_ver_str, sizeof(plc_proto_ver_str), "%u.%u",
version_minor(devdesc->proto_version),
version_revis(devdesc->proto_version));
snprintf(plc_proto_ver_str, sizeof(plc_proto_ver_str), "%u.%u.%u",
version_major(devdesc->hw_info.plc_proto_version),
version_minor(devdesc->hw_info.plc_proto_version),
version_revis(devdesc->hw_info.plc_proto_version));
snprintf(fw_ver_str, sizeof(fw_ver_str), "%u.%u.%u",
version_major(devdesc->hw_info.fw_version),
version_minor(devdesc->hw_info.fw_version),
version_revis(devdesc->hw_info.fw_version));
snprintf(hw_ver_str, sizeof(hw_ver_str), "%u.%u.%u",
version_major(devdesc->hw_info.hw_version),
version_minor(devdesc->hw_info.hw_version),
version_revis(devdesc->hw_info.hw_version));
snprintf(uid_str, sizeof(uid_str), "%x%x%x",
devdesc->hw_info.uid.part1,
devdesc->hw_info.uid.part2,
devdesc->hw_info.uid.part3);
update = BCON_NEW("$currentDate", "{",
"loggedinAt", BCON_BOOL(true),
"updatedAt", BCON_BOOL(true),
"}",
"$set", "{",
"type", BCON_UTF8(sky_devtype_to_str(devdesc->dev_type)),
"name", BCON_UTF8(devdesc->dev_name),
"firmwareVersion", BCON_UTF8(fw_ver_str),
"hardwareVersion", BCON_UTF8(hw_ver_str),
"protocolVersion", BCON_UTF8(proto_ver_str),
"plcProtocolVersion", BCON_UTF8(plc_proto_ver_str),
"hw_uid", BCON_UTF8(uid_str),
"}");
} else {
update = BCON_NEW("$currentDate", "{",
"updatedAt", BCON_BOOL(true),
"}");
}
opts = mongoc_find_and_modify_opts_new();
mongoc_find_and_modify_opts_set_update(opts, update);
success = mongoc_collection_find_and_modify_with_opts(
db_client->coll_chargers, query, opts, &reply, NULL);
if (success)
success = bson_iter_init_find(&iter, &reply, "lastErrorObject") &&
BSON_ITER_HOLDS_DOCUMENT(&iter) &&
bson_iter_recurse(&iter, &citer) &&
bson_iter_find (&citer, "updatedExisting") &&
BSON_ITER_HOLDS_BOOL(&citer) &&
bson_iter_bool(&citer);
bson_destroy(update);
bson_destroy(query);
bson_destroy(&reply);
mongoc_find_and_modify_opts_destroy(opts);
return success;
}
static bool
db_lookup_online_devices_by_usruuid(struct db_client *db_client, uuid_t usruuid,
uuid_t **devuuids, size_t *nr_devuuids)
{
mongoc_cursor_t *cursor;
bson_t *pipeline;
char usruuid_str[37];
const bson_t *doc;
const char *chargers_name;
unsigned found;
uuid_t *uuids;
uuid_unparse(usruuid, usruuid_str);
chargers_name = mongoc_collection_get_name(db_client->coll_chargers);
pipeline = BCON_NEW(
"pipeline", "[",
/* Lookup user UUID with valid userId */
"{",
"$match", "{",
"userUUID", BCON_UTF8(usruuid_str),
"userId", "{", "$exists", BCON_BOOL(true), "}",
"}",
"}",
/* Lookup online chargers belong to that user */
"{",
"$lookup", "{",
"from", BCON_UTF8(chargers_name),
"as", "online_charger",
"let", "{", "userId", "$userId",
"updatedAt", "$updatedAt",
"}",
"pipeline", "[",
"{",
"$match", "{",
"$expr", "{",
"$and", "[",
"{", "$eq", "[", "$userId", "$$userId", "]", "}",
"{", "$gte", "[", "$updatedAt", "{", "$subtract", "[", "$$NOW", BCON_INT32(SKY_HEARTBEAT_IVL_MS), "]", "}", "]", "}",
"]",
"}",
"}",
"}",
"]",
"}",
"}",
/* Unwind array of online chargers */
"{", "$unwind", "$online_charger", "}",
/* Get flatten deviceId fields only of online chargers */
"{",
"$project", "{", "_id", "$online_charger._id",
"deviceId", "$online_charger.deviceId", "}",
"}",
"]");
cursor = mongoc_collection_aggregate(db_client->coll_user_uuids,
MONGOC_QUERY_NONE, pipeline,
NULL, NULL);
uuids = NULL;
found = 0;
while (mongoc_cursor_next(cursor, &doc)) {
uuid_t uuid, *ptr;
bson_iter_t iter;
bool parsed;
parsed = bson_iter_init_find(&iter, doc, "deviceId") &&
BSON_ITER_HOLDS_UTF8(&iter) &&
uuid_parse(bson_iter_utf8(&iter, NULL), uuid) == 0;
found += !!parsed;
if (parsed) {
ptr = reallocarray(uuids, found, 37);
if (!ptr) {
sky_err("No memory!\n");
free(uuids);
uuids = NULL;
found = 0;
break;
}
uuids = ptr;
memcpy(&uuids[found - 1], uuid, sizeof(uuid));
}
}
mongoc_cursor_destroy(cursor);
bson_destroy(pipeline);
*nr_devuuids = found;
*devuuids = uuids;
return !!found;
}
static bool
db_lookup_device_by_usruuid_devuuid(struct db_client *db_client,
uuid_t usruuid, uuid_t devuuid)
{
mongoc_cursor_t *cursor;
bson_t *pipeline;
char usruuid_str[37];
char devuuid_str[37];
const bson_t *doc;
const char *chargers_name;
bool found;
uuid_unparse(usruuid, usruuid_str);
uuid_unparse(devuuid, devuuid_str);
chargers_name = mongoc_collection_get_name(db_client->coll_chargers);
pipeline = BCON_NEW(
"pipeline", "[",
/* Lookup user UUID with valid userId */
"{",
"$match", "{",
"userUUID", BCON_UTF8(usruuid_str),
"userId", "{", "$exists", BCON_BOOL(true), "}",
"}",
"}",
/* Lookup charger belong to that user */
"{",
"$lookup", "{",
"from", BCON_UTF8(chargers_name),
"as", "charger",
"let", "{",
"userId", "$userId",
"deviceId", "$deviceId",
"updatedAt", "$updatedAt",
"}",
"pipeline", "[",
"{",
"$match", "{",
"$expr", "{",
"$and", "[",
"{", "$eq", "[", "$userId", "$$userId", "]", "}",
"{", "$eq", "[", "$deviceId", BCON_UTF8(devuuid_str), "]", "}",
"]",
"}",
"}",
"}",
"]",
"}",
"}",
/* Unwind array of chargers */
"{", "$unwind", "$charger", "}",
/* Get flatten deviceId fields only of chargers */
"{",
"$project", "{", "_id", "$charger._id",
"deviceId", "$charger.deviceId", "}",
"}",
"]");
cursor = mongoc_collection_aggregate(db_client->coll_user_uuids,
MONGOC_QUERY_NONE, pipeline,
NULL, NULL);
found = mongoc_cursor_next(cursor, &doc);
mongoc_cursor_destroy(cursor);
bson_destroy(pipeline);
return found;
}
static bool
db_lookup_user_by_usruuid(struct db_client *db_client, uuid_t usruuid)
{
mongoc_cursor_t *cursor;
bson_t *pipeline;
char usruuid_str[37];
const bson_t *doc;
bool found;
uuid_unparse(usruuid, usruuid_str);
pipeline = BCON_NEW(
"pipeline", "[",
/* Lookup user UUID with valid userId */
"{",
"$match", "{",
"userUUID", BCON_UTF8(usruuid_str),
"userId", "{", "$exists", BCON_BOOL(true), "}",
"}",
"}",
/* Get few fields only */
"{",
"$project", "{", "_id", BCON_BOOL(true),
"userUUID", BCON_BOOL(true),
"userId", BCON_BOOL(true),
"}",
"}",
"]");
cursor = mongoc_collection_aggregate(db_client->coll_user_uuids,
MONGOC_QUERY_NONE, pipeline,
NULL, NULL);
found = mongoc_cursor_next(cursor, &doc);
mongoc_cursor_destroy(cursor);
bson_destroy(pipeline);
return found;
}
static void db_update_charging_session(struct db_client *db_client, uuid_t devuuid,
const struct sky_charging_state *state)
{
bson_error_t error;
bson_t *query;
bson_t *update;
bson_t *opts;
char devuuid_str[37];
bool success;
uuid_unparse(devuuid, devuuid_str);
query = BCON_NEW("deviceId", BCON_UTF8(devuuid_str),
"chargingSessionId", BCON_INT32(state->charging_session_id));
/* Pipeline update */
update = BCON_NEW(
/*
* If document exists don't modify 'createdAt' and
* 'startTime' fields. If document does not exist set
* fields mentioned above and set 'values' array to
* initial '[]' value.
*/
"0", "{",
"$set", "{",
"createdAt", "{",
"$ifNull", "[", "$createdAt", "$$NOW", "]",
"}",
"startTime", "{",
"$ifNull", "[",
"$startTime", "{",
"$subtract", "[", "$$NOW", BCON_INT32(state->charging_secs), "]",
"}",
"]",
"}",
"updatedAt", "$$NOW",
"totalAhCharged", BCON_DOUBLE(state->charge_mAh / 1000.0),
"totalWhCharged", BCON_DOUBLE(state->energy_mWh / 1000.0),
"values", "{",
"$ifNull", "[",
"$values", "[", "]",
"]",
"}",
"}",
"}",
/*
* Second step in update pipeline: document is
* prepared, append the measurements from the charging
* state to the 'values' array.
*/
"1", "{",
"$set", "{",
"values", "{",
"$concatArrays", "[", "$values", "[", "{",
"timestamp", "$$NOW",
"state", BCON_UTF8(sky_devstate_to_str(SKY_MUX_HW2,
state->dev_hw_state)),
"reason", BCON_UTF8(sky_devreason_to_str(state->dev_hw_reason)),
"current", BCON_DOUBLE(state->current_mA / 1000.0),
"voltage", BCON_DOUBLE(state->voltage_mV / 1000.0),
"power", BCON_DOUBLE((double)state->voltage_mV * state->current_mA / 1000000.0),
"soc", BCON_INT32(state->state_of_charge),
"untilFullSecs", BCON_INT32(state->until_full_secs),
"energy", BCON_DOUBLE(state->energy_mWh / 1000.0),
"charge", BCON_DOUBLE(state->charge_mAh / 1000.0),
"muxHumidityPerc", BCON_INT32(state->mux_humidity_perc),
"muxTemperature", BCON_INT32(state->mux_temperature_C),
"sinkTemperature", BCON_INT32(state->sink_temperature_C),
"linkQualityFactor", BCON_INT32(state->link_quality_factor),
"tx", "{",
"bytes", BCON_INT32(state->tx.bytes),
"packets", BCON_INT32(state->tx.packets),
"errBytes", BCON_INT32(state->tx.err_bytes),
"errPackets", BCON_INT32(state->tx.err_packets),
"}",
"rx", "{",
"bytes", BCON_INT32(state->rx.bytes),
"packets", BCON_INT32(state->rx.packets),
"errBytes", BCON_INT32(state->rx.err_bytes),
"errPackets", BCON_INT32(state->rx.err_packets),
"}",
"}", "]", "]",
"}",
"}",
"}"
);
opts = BCON_NEW("upsert", BCON_BOOL(true));
success = mongoc_collection_update_one(
db_client->coll_charging_sessions, query, update,
opts, NULL, &error);
if (!success)
sky_err("mongoc_collection_update_one() error: \"%s\"\n",
error.message);
bson_destroy(update);
bson_destroy(query);
bson_destroy(opts);
}
static void db_update_charger_device(struct db_client *db_client, uuid_t devuuid,
const struct sky_charging_state *state)
{
bson_error_t error;
bson_t *query;
bson_t *update;
char devuuid_str[37];
bool success;
uuid_unparse(devuuid, devuuid_str);
query = BCON_NEW("deviceId", BCON_UTF8(devuuid_str));
/* Pipeline update */
update = BCON_NEW(
"0", "{",
"$set", "{",
"updatedAt", "$$NOW",
"state", BCON_UTF8(sky_devstate_to_str(SKY_MUX_HW2,
state->dev_hw_state)),
"reason", BCON_UTF8(sky_devreason_to_str(state->dev_hw_reason)),
"muxHumidityPerc", BCON_INT32(state->mux_humidity_perc),
"muxTemperature", BCON_INT32(state->mux_temperature_C),
"}",
"}");
success = mongoc_collection_update_one(
db_client->coll_chargers, query, update,
NULL, NULL, &error);
if (!success)
sky_err("mongoc_collection_update_one() error: \"%s\"\n",
error.message);
bson_destroy(update);
bson_destroy(query);
}
/**
* sky_find_data_frame() - finds first data frame, skips all
* IDENT and 0 frames.
*/
static inline zframe_t *sky_find_data_frame(zmsg_t *msg)
{
zframe_t *data, *next;
data = zmsg_first(msg);
while (data) {
next = zmsg_next(msg);
if (!next || zframe_size(next) != 0) {
zframe_t *pos;
/*
* Replay from first till data, in order to
* set internal cursor correctly. Stupid zmsg.
*/
for (pos = zmsg_first(msg); pos != data;
pos = zmsg_next(msg))
;
/* Found data frame */
break;
}
data = zmsg_next(msg);
}
return data;
}
static zframe_t *sky_zmsg_prev(zmsg_t *msg, zframe_t *frame)
{
zframe_t *prev = NULL, *next;
next = zmsg_first(msg);
while (next) {
if (next == frame)
return prev;
prev = next;
next = zmsg_next(msg);
}
return NULL;
}
static void server_peer_free(struct server_peer *peer)
{
zmsg_destroy(&peer->idents_msg);
zframe_destroy(&peer->data_frame);
sky_devsfree(peer->devdesc);
free(peer);
}
static bool is_uuid_frame_valid(zframe_t *uuid)
{
return (uuid && zframe_size(uuid) == 16);
}
static void peer_destructor_fn(void **item)
{
struct server_peer *peer = *item;
server_peer_free(peer);
}
static int uuid_comparator_fn(const void *uuid1, const void *uuid2)
{
return memcmp(uuid1, uuid2, sizeof(uuid_t));
}
/*
* This is the "One-at-a-Time" algorithm by Bob Jenkins
* from requirements by Colin Plumb.
* (http://burtleburtle.net/bob/hash/doobs.html)
*/
static inline unsigned int jhash(const char *key, size_t len)
{
unsigned int hash, i;
for (hash = 0, i = 0; i < len; ++i) {
hash += key[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += (hash << 3);
hash ^= (hash >> 11);
hash += (hash << 15);
return hash;
}
static size_t uuid_hasher_fn(const void *uuid)
{
return jhash(uuid, sizeof(uuid_t));
}
static int sky_reap_dead_servers(zhashx_t *hash)
{
struct server_peer *head = NULL, *next;
struct server_peer *peer;
unsigned long long ms, nearest = ~0ull;
ms = zclock_time();
pthread_mutex_lock(&hash_lock);
for (peer = zhashx_first(hash); peer; peer = zhashx_next(hash)) {
if (ms >= peer->expires_at) {
peer->next = head;
head = peer;
} else if (peer->expires_at < nearest)
nearest = peer->expires_at;
}
/*
* Ugly crap, but we are not able to delete hash item while
* traversing hash itself.
*/
while (head) {
next = head->next;
/*
* Zmq guys do lookup on each delete, even we have item
* in our hands, what a wonderfull design.
*/
zhashx_delete(hash, head->devuuid);
head = next;
}
pthread_mutex_unlock(&hash_lock);
return nearest == ~0ull ? -1 : (nearest - ms) * ZMQ_POLL_MSEC;
}
static bool parse_devs_list_rsp(struct db_client *db_client,
zframe_t *data, struct server_peer *peer)
{
struct sky_dev_desc *list = NULL;
struct sky_dev_desc *devdesc;
struct sky_parse_devs_list_rsp_result result = {
.list = &list
};
int rc;
rc = sky_parse_devs_list_rsp(zframe_data(data), zframe_size(data),
NULL, &result);
if (rc || result.error)
return false;
if (result.num_devs != 1) {
/* We don't support many devices from the same host */
sky_devsfree(list);
return false;
}
/* Even this is a loop, we expect only 1 device from the same host */
foreach_devdesc(devdesc, list) {
bool authed;
authed = db_lookup_and_update_device_by_devuuid(db_client,
devdesc,
false);
if (!authed) {
char devuuid_str[37];
uuid_unparse(devdesc->dev_uuid, devuuid_str);
sky_err("Unauthorized attempt to register device with UUID '%s'\n",
devuuid_str);
sky_devsfree(list);
return false;
}
}
peer->devdesc = list;
peer->rsp_len = result.rsp_len;
peer->num_devs = result.num_devs;
peer->info_off = result.info_off;
peer->dyn_info = result.dyn_info;
return true;
}
static void sky_handle_server_msg(void *servers, void *clients,
zhashx_t *srvs_hash,
struct db_client *db_client)
{
zframe_t *data, *ident;
struct server_peer *peer;
uuid_t devuuid;
zmsg_t *msg;
bool authed;
int i, rc;
msg = zmsg_recv(servers);
ident = msg ? zmsg_first(msg) : NULL;
if (!ident) {
zmsg_destroy(&msg);
/* WTF? */
return;
}
if (!is_uuid_frame_valid(ident)) {
/* Support uuids as idents only */
zmsg_destroy(&msg);
return;
}
memcpy(devuuid, zframe_data(ident), sizeof(devuuid));
pthread_mutex_lock(&hash_lock);
peer = zhashx_lookup(srvs_hash, devuuid);
pthread_mutex_unlock(&hash_lock);
if (!peer) {
/*
* New connection from server
*/
data = sky_find_data_frame(msg);
if (!data) {
/* Malformed or unauthorized message? */
zmsg_destroy(&msg);
return;
}
peer = calloc(1, sizeof(*peer));
if (!peer) {
sky_err("No memory\n");
zmsg_destroy(&msg);
return;
}
peer->expires_at = zclock_time() +
SKY_HEARTBEAT_IVL_MS * SKY_HEARTBEAT_CNT;
peer->idents_msg = msg;
memcpy(peer->devuuid, devuuid, sizeof(devuuid));
if (!parse_devs_list_rsp(db_client, data, peer)) {
server_peer_free(peer);
return;
}
/* Take ownership on data frame */
peer->data_frame = data;
peer->rsp_data = (void *)zframe_data(data);
zmsg_remove(msg, data);
/* Remove all possible frames below IDENT+0 frames */
for (i = 0, data = zmsg_first(msg); data;
data = zmsg_next(msg), i++) {
/* Skip two ident frames: IDENT+0 */
if (i >= 2) {
zmsg_remove(msg, data);
zframe_destroy(&data);
}
}
pthread_mutex_lock(&hash_lock);
rc = zhashx_insert(srvs_hash, peer->devuuid, peer);
pthread_mutex_unlock(&hash_lock);
if (rc) {
sky_err("zhashx_insert(): %d\n", rc);
server_peer_free(peer);
return;
}
} else {
/*
* Response from known server, forward to client. Server keeps
* all idents on stack, so simply forward the whole message.
*/
authed = db_lookup_and_update_device_by_devuuid(db_client,
peer->devdesc,
true);
if (!authed) {
/*
* Charging device is not authorized any more.
* Do nothing, soon the peer will be expired
* and reaped.
*/
zmsg_destroy(&msg);
return;
}
/* Refresh expiration */
peer->expires_at = zclock_time() +
SKY_HEARTBEAT_IVL_MS * SKY_HEARTBEAT_CNT;
data = sky_find_data_frame(msg);
if (!data) {
/* Heartbeat message is empty, pong it back */
rc = zmsg_send(&msg, servers);
if (rc) {
sky_err("zmsg_send(): %s\n", strerror(errno));
zmsg_destroy(&msg);
return;
}
} else {
/* Remove IDENT+0 frame from stack */
ident = zmsg_first(msg);
zmsg_remove(msg, ident);
zframe_destroy(&ident);
ident = zmsg_next(msg);
zmsg_remove(msg, ident);
zframe_destroy(&ident);
rc = zmsg_send(&msg, clients);
if (rc) {
sky_err("zmsg_send(): %s\n", strerror(errno));
zmsg_destroy(&msg);
return;
}
}
}
}
static int sky_devs_list_rsp(zhashx_t *srvs_hash,
uuid_t *devuuids,
size_t nr_devuuids,
uint16_t proto_version,
struct sky_devs_list_rsp **rsp_,
size_t *rsp_len)
{
struct sky_devs_list_rsp *rsp;
struct server_peer *peer;
void *rsp_data;
bool dyn_info;
size_t i, num, len;
*rsp_ = NULL;
*rsp_len = 0;
/* Compatibility with protocols below 0x0400 */
dyn_info = (proto_version >= 0x0400);
len = dyn_info ?
sizeof(*rsp) :
offsetof_end(typeof(*rsp), info_off);
rsp = rsp_data = calloc(1, len);
if (!rsp)
return -ENOMEM;
rsp->hdr.type = htole16(SKY_DEVS_LIST_RSP);
rsp->hdr.error = 0;
for (num = 0, i = 0; i < nr_devuuids; i++) {
size_t info_len;
void *tmp;
pthread_mutex_lock(&hash_lock);
peer = zhashx_lookup(srvs_hash, devuuids[i]);
pthread_mutex_unlock(&hash_lock);
if (!peer)
/* Rarely can happen */
continue;
/* Skybroker does not try to peer old clients with new servers */
if (!dyn_info && peer->dyn_info) {
sky_err("The old client can't peer with the new server, so server will not be added to the result list!\n");
continue;
}
info_len = peer->rsp_len - peer->info_off;
tmp = realloc(rsp, len + info_len);
if (!tmp) {
free(rsp);
return -ENOMEM;
}
rsp = rsp_data = tmp;
memcpy(rsp_data + len, peer->rsp_data + peer->info_off, info_len);
num += peer->num_devs;
len += info_len;
}
rsp->num_devs = htole16(num);
if (dyn_info) {
/* Protocol version >= 0x0400 */
rsp->info_off = htole16(offsetof_end(typeof(*rsp), info_off));
}
*rsp_ = rsp;
*rsp_len = len;