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// SPDX-License-Identifier: GPL-3.0-or-later
#include <snappy.h>
#include "remote_write.pb.h"
#include "remote_write_request.h"
using namespace prometheus;
google::protobuf::Arena arena;
/**
* Initialize a write request
*
* @return Returns a new write request
*/
void *init_write_request()
{
GOOGLE_PROTOBUF_VERIFY_VERSION;
WriteRequest *write_request = google::protobuf::Arena::CreateMessage<WriteRequest>(&arena);
return (void *)write_request;
}
/**
* Adds information about a host to a write request
*
* @param write_request_p the write request
* @param name the name of a metric which is used for providing the host information
* @param instance the name of the host itself
* @param application the name of a program which sends the information
* @param version the version of the program
* @param timestamp the timestamp for the metric in milliseconds
*/
void add_host_info(
void *write_request_p,
const char *name, const char *instance, const char *application, const char *version, const int64_t timestamp)
{
WriteRequest *write_request = (WriteRequest *)write_request_p;
TimeSeries *timeseries;
Sample *sample;
Label *label;
timeseries = write_request->add_timeseries();
label = timeseries->add_labels();
label->set_name("__name__");
label->set_value(name);
label = timeseries->add_labels();
label->set_name("instance");
label->set_value(instance);
if (application) {
label = timeseries->add_labels();
label->set_name("application");
label->set_value(application);
}
if (version) {
label = timeseries->add_labels();
label->set_name("version");
label->set_value(version);
}
sample = timeseries->add_samples();
sample->set_value(1);
sample->set_timestamp(timestamp);
}
/**
* Adds a label to the last created timeseries
*
* @param write_request_p the write request with the timeseries
* @param key the key of the label
* @param value the value of the label
*/
void add_label(void *write_request_p, char *key, char *value)
{
WriteRequest *write_request = (WriteRequest *)write_request_p;
TimeSeries *timeseries;
Label *label;
timeseries = write_request->mutable_timeseries(write_request->timeseries_size() - 1);
label = timeseries->add_labels();
label->set_name(key);
label->set_value(value);
}
/**
* Adds a metric to a write request
*
* @param write_request_p the write request
* @param name the name of the metric
* @param chart the chart, the metric belongs to
* @param family the family, the metric belongs to
* @param dimension the dimension, the metric belongs to
* @param instance the name of the host, the metric belongs to
* @param value the value of the metric
* @param timestamp the timestamp for the metric in milliseconds
*/
void add_metric(
void *write_request_p,
const char *name, const char *chart, const char *family, const char *dimension, const char *instance,
const double value, const int64_t timestamp)
{
WriteRequest *write_request = (WriteRequest *)write_request_p;
TimeSeries *timeseries;
Sample *sample;
Label *label;
timeseries = write_request->add_timeseries();
label = timeseries->add_labels();
label->set_name("__name__");
label->set_value(name);
label = timeseries->add_labels();
label->set_name("chart");
label->set_value(chart);
label = timeseries->add_labels();
label->set_name("family");
label->set_value(family);
if (dimension) {
label = timeseries->add_labels();
label->set_name("dimension");
label->set_value(dimension);
}
label = timeseries->add_labels();
label->set_name("instance");
label->set_value(instance);
sample = timeseries->add_samples();
sample->set_value(value);
sample->set_timestamp(timestamp);
}
/**
* Adds a metric to a write request
*
* @param write_request_p the write request
* @param name the name of the metric
* @param instance the name of the host, the metric belongs to
* @param value the value of the metric
* @param timestamp the timestamp for the metric in milliseconds
*/
void add_variable(
void *write_request_p, const char *name, const char *instance, const double value, const int64_t timestamp)
{
WriteRequest *write_request = (WriteRequest *)write_request_p;
TimeSeries *timeseries;
Sample *sample;
Label *label;
timeseries = write_request->add_timeseries();
label = timeseries->add_labels();
label->set_name("__name__");
label->set_value(name);
label = timeseries->add_labels();
label->set_name("instance");
label->set_value(instance);
sample = timeseries->add_samples();
sample->set_value(value);
sample->set_timestamp(timestamp);
}
/**
* Gets the size of a write request
*
* @param write_request_p the write request
* @return Returns the size of the write request
*/
size_t get_write_request_size(void *write_request_p)
{
WriteRequest *write_request = (WriteRequest *)write_request_p;
#if GOOGLE_PROTOBUF_VERSION < 3001000
size_t size = (size_t)snappy::MaxCompressedLength(write_request->ByteSize());
#else
size_t size = (size_t)snappy::MaxCompressedLength(write_request->ByteSizeLong());
#endif
return (size < INT_MAX) ? size : 0;
}
/**
* Packs a write request into a buffer and clears the request
*
* @param write_request_p the write request
* @param buffer a buffer, where compressed data is written
* @param size gets the size of the write request, returns the size of the compressed data
* @return Returns 0 on success, 1 on failure
*/
int pack_and_clear_write_request(void *write_request_p, char *buffer, size_t *size)
{
WriteRequest *write_request = (WriteRequest *)write_request_p;
std::string uncompressed_write_request;
if (write_request->SerializeToString(&uncompressed_write_request) == false)
return 1;
write_request->clear_timeseries();
snappy::RawCompress(uncompressed_write_request.data(), uncompressed_write_request.size(), buffer, size);
return 0;
}
/**
* Writes an unpacked write request into a text buffer
*
* @param write_request_p the write request
* @param buffer a buffer, where text is written
* @param size the size of the buffer
* @return Returns 0 on success, 1 on failure
*/
int convert_write_request_to_string(
const char *compressed_write_request,
size_t compressed_size,
char *buffer,
size_t size)
{
size_t uncompressed_size = 0;
snappy::GetUncompressedLength(compressed_write_request, compressed_size, &uncompressed_size);
if (size < uncompressed_size)
return 1;
char *uncompressed_write_request = (char *)malloc(size);
if (snappy::RawUncompress(compressed_write_request, compressed_size, uncompressed_write_request) == false) {
free(uncompressed_write_request);
return 1;
}
WriteRequest *write_request = google::protobuf::Arena::CreateMessage<WriteRequest>(&arena);
if (write_request->ParseFromString(std::string(uncompressed_write_request, uncompressed_size)) == false) {
free(uncompressed_write_request);
return 1;
}
std::string text_write_request(write_request->DebugString());
text_write_request.copy(buffer, size);
free(uncompressed_write_request);
return 0;
}
/**
* Shuts down the Protobuf library
*/
void protocol_buffers_shutdown()
{
google::protobuf::ShutdownProtobufLibrary();
}
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