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netdata/aclk/aclk_rx_msgs.c

318 lines
9.6 KiB
C
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#include "aclk_rx_msgs.h"
#include "aclk_common.h"
#include "aclk_stats.h"
#include "aclk_query.h"
static inline int aclk_extract_v2_data(char *payload, char **data)
{
char* ptr = strstr(payload, ACLK_V2_PAYLOAD_SEPARATOR);
if(!ptr)
return 1;
ptr += strlen(ACLK_V2_PAYLOAD_SEPARATOR);
*data = strdupz(ptr);
return 0;
}
static inline int aclk_v2_payload_get_query(const char *payload, struct aclk_request *req)
{
const char *start, *end;
if(strncmp(payload, ACLK_CLOUD_REQ_V2_PREFIX, strlen(ACLK_CLOUD_REQ_V2_PREFIX))) {
errno = 0;
error("Only accepting requests that start with \"%s\" from CLOUD.", ACLK_CLOUD_REQ_V2_PREFIX);
return 1;
}
start = payload + 4;
if(!(end = strstr(payload, " HTTP/1.1\x0D\x0A"))) {
errno = 0;
error("Doesn't look like HTTP GET request.");
return 1;
}
req->payload = mallocz((end - start) + 1);
strncpyz(req->payload, start, end - start);
return 0;
}
#define HTTP_CHECK_AGENT_INITIALIZED() ACLK_SHARED_STATE_LOCK;\
if (unlikely(aclk_shared_state.agent_state == AGENT_INITIALIZING)) {\
debug(D_ACLK, "Ignoring \"http\" cloud request; agent not in stable state");\
ACLK_SHARED_STATE_UNLOCK;\
return 1;\
}\
ACLK_SHARED_STATE_UNLOCK;
/*
* Parse the incoming payload and queue a command if valid
*/
static int aclk_handle_cloud_request_v1(struct aclk_request *cloud_to_agent, char *raw_payload)
{
UNUSED(raw_payload);
HTTP_CHECK_AGENT_INITIALIZED();
errno = 0;
if (unlikely(cloud_to_agent->version != 1)) {
error(
"Received \"http\" message from Cloud with version %d, but ACLK version %d is used",
cloud_to_agent->version,
aclk_shared_state.version_neg);
return 1;
}
if (unlikely(!cloud_to_agent->payload)) {
error("payload missing");
return 1;
}
if (unlikely(!cloud_to_agent->callback_topic)) {
error("callback_topic missing");
return 1;
}
if (unlikely(!cloud_to_agent->msg_id)) {
error("msg_id missing");
return 1;
}
if (unlikely(aclk_queue_query(cloud_to_agent->callback_topic, NULL, cloud_to_agent->msg_id, cloud_to_agent->payload, 0, 0, ACLK_CMD_CLOUD)))
debug(D_ACLK, "ACLK failed to queue incoming \"http\" message");
return 0;
}
static int aclk_handle_cloud_request_v2(struct aclk_request *cloud_to_agent, char *raw_payload)
{
HTTP_CHECK_AGENT_INITIALIZED();
char *data;
errno = 0;
if (cloud_to_agent->version < ACLK_V_COMPRESSION) {
error(
"This handler cannot reply to request with version older than %d, received %d.",
ACLK_V_COMPRESSION,
cloud_to_agent->version);
return 1;
}
if (unlikely(aclk_extract_v2_data(raw_payload, &data))) {
error("Error extracting payload expected after the JSON dictionary.");
return 1;
}
if (unlikely(aclk_v2_payload_get_query(data, cloud_to_agent))) {
error("Could not extract payload from query");
freez(data);
return 1;
}
if (unlikely(!cloud_to_agent->callback_topic)) {
error("Missing callback_topic");
freez(data);
return 1;
}
if (unlikely(!cloud_to_agent->msg_id)) {
error("Missing msg_id");
freez(data);
return 1;
}
// aclk_queue_query takes ownership of data pointer
if (unlikely(aclk_queue_query(
cloud_to_agent->callback_topic, data, cloud_to_agent->msg_id, cloud_to_agent->payload, 0, 0,
ACLK_CMD_CLOUD_QUERY_2)))
debug(D_ACLK, "ACLK failed to queue incoming \"http\" message");
UNUSED(cloud_to_agent);
return 0;
}
// This handles `version` message from cloud used to negotiate
// protocol version we will use
static int aclk_handle_version_response(struct aclk_request *cloud_to_agent, char *raw_payload)
{
UNUSED(raw_payload);
int version = -1;
errno = 0;
if (unlikely(cloud_to_agent->version != ACLK_VERSION_NEG_VERSION)) {
error(
"Unsuported version of \"version\" message from cloud. Expected %d, Got %d",
ACLK_VERSION_NEG_VERSION,
cloud_to_agent->version);
return 1;
}
if (unlikely(!cloud_to_agent->min_version)) {
error("Min version missing or 0");
return 1;
}
if (unlikely(!cloud_to_agent->max_version)) {
error("Max version missing or 0");
return 1;
}
if (unlikely(cloud_to_agent->max_version < cloud_to_agent->min_version)) {
error(
"Max version (%d) must be >= than min version (%d)", cloud_to_agent->max_version,
cloud_to_agent->min_version);
return 1;
}
if (unlikely(cloud_to_agent->min_version > ACLK_VERSION_MAX)) {
error(
"Agent too old for this cloud. Minimum version required by cloud %d."
" Maximum version supported by this agent %d.",
cloud_to_agent->min_version, ACLK_VERSION_MAX);
aclk_kill_link = 1;
aclk_disable_runtime = 1;
return 1;
}
if (unlikely(cloud_to_agent->max_version < ACLK_VERSION_MIN)) {
error(
"Cloud version is too old for this agent. Maximum version supported by cloud %d."
" Minimum (oldest) version supported by this agent %d.",
cloud_to_agent->max_version, ACLK_VERSION_MIN);
aclk_kill_link = 1;
return 1;
}
version = MIN(cloud_to_agent->max_version, ACLK_VERSION_MAX);
ACLK_SHARED_STATE_LOCK;
if (unlikely(now_monotonic_usec() > aclk_shared_state.version_neg_wait_till)) {
errno = 0;
error("The \"version\" message came too late ignoring.");
goto err_cleanup;
}
if (unlikely(aclk_shared_state.version_neg)) {
errno = 0;
error("Version has already been set to %d", aclk_shared_state.version_neg);
goto err_cleanup;
}
aclk_shared_state.version_neg = version;
ACLK_SHARED_STATE_UNLOCK;
info("Choosing version %d of ACLK", version);
aclk_set_rx_handlers(version);
return 0;
err_cleanup:
ACLK_SHARED_STATE_UNLOCK;
return 1;
}
typedef struct aclk_incoming_msg_type{
char *name;
int(*fnc)(struct aclk_request *, char *);
}aclk_incoming_msg_type;
aclk_incoming_msg_type aclk_incoming_msg_types_v1[] = {
{ .name = "http", .fnc = aclk_handle_cloud_request_v1 },
{ .name = "version", .fnc = aclk_handle_version_response },
{ .name = NULL, .fnc = NULL }
};
aclk_incoming_msg_type aclk_incoming_msg_types_compression[] = {
{ .name = "http", .fnc = aclk_handle_cloud_request_v2 },
{ .name = "version", .fnc = aclk_handle_version_response },
{ .name = NULL, .fnc = NULL }
};
struct aclk_incoming_msg_type *aclk_incoming_msg_types = aclk_incoming_msg_types_v1;
void aclk_set_rx_handlers(int version)
{
if(version >= ACLK_V_COMPRESSION) {
aclk_incoming_msg_types = aclk_incoming_msg_types_compression;
return;
}
aclk_incoming_msg_types = aclk_incoming_msg_types_v1;
}
int aclk_handle_cloud_message(char *payload)
{
struct aclk_request cloud_to_agent;
memset(&cloud_to_agent, 0, sizeof(struct aclk_request));
if (aclk_stats_enabled) {
ACLK_STATS_LOCK;
aclk_metrics_per_sample.cloud_req_recvd++;
ACLK_STATS_UNLOCK;
}
if (unlikely(!payload)) {
errno = 0;
error("ACLK incoming message is empty");
goto err_cleanup_nojson;
}
debug(D_ACLK, "ACLK incoming message (%s)", payload);
int rc = json_parse(payload, &cloud_to_agent, cloud_to_agent_parse);
if (unlikely(rc != JSON_OK)) {
errno = 0;
error("Malformed json request (%s)", payload);
goto err_cleanup;
}
if (!cloud_to_agent.type_id) {
errno = 0;
error("Cloud message is missing compulsory key \"type\"");
goto err_cleanup;
}
if (!aclk_shared_state.version_neg && strcmp(cloud_to_agent.type_id, "version")) {
error("Only \"version\" message is allowed before popcorning and version negotiation is finished. Ignoring");
goto err_cleanup;
}
for (int i = 0; aclk_incoming_msg_types[i].name; i++) {
if (strcmp(cloud_to_agent.type_id, aclk_incoming_msg_types[i].name) == 0) {
if (likely(!aclk_incoming_msg_types[i].fnc(&cloud_to_agent, payload))) {
// in case of success handler is supposed to clean up after itself
// or as in the case of aclk_handle_cloud_request take
// ownership of the pointers (done to avoid copying)
// see what `aclk_queue_query` parameter `internal` does
// NEVER CONTINUE THIS LOOP AFTER CALLING FUNCTION!!!
// msg handlers (namely aclk_handle_version_responce)
// can freely change what aclk_incoming_msg_types points to
// so either exit or restart this for loop
freez(cloud_to_agent.type_id);
return 0;
}
goto err_cleanup;
}
}
errno = 0;
error("Unknown message type from Cloud \"%s\"", cloud_to_agent.type_id);
err_cleanup:
if (cloud_to_agent.payload)
freez(cloud_to_agent.payload);
if (cloud_to_agent.type_id)
freez(cloud_to_agent.type_id);
if (cloud_to_agent.msg_id)
freez(cloud_to_agent.msg_id);
if (cloud_to_agent.callback_topic)
freez(cloud_to_agent.callback_topic);
err_cleanup_nojson:
if (aclk_stats_enabled) {
ACLK_STATS_LOCK;
aclk_metrics_per_sample.cloud_req_err++;
ACLK_STATS_UNLOCK;
}
return 1;
}
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