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Implement SD Card message cache #2

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Implement SD Card message cache #2

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10 changes: 8 additions & 2 deletions include/lemlog/logger/sinks/sd-card.hpp
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Original file line number Diff line number Diff line change
@@ -1,19 +1,25 @@
#pragma once

#include "lemlog/logger/logger.hpp"
#include <vector>

namespace logger {
/**
* @brief SD card class. Outputs all data to the SD card connected to the brain.
*/
class SDCard : public Sink {
public:
SDCard(std::string filename = ".log", bool logTimestamp = true);
SDCard(std::string filename = ".log", bool logTimestamp = true,
int cacheSize = 10);
void send(Level level, std::string topic, std::string message) override;
private:
std::string formatTimestamp(long long ms);

// cache of messages
std::vector<std::string> cache;

std::string filename;
bool logTimestamp;
int cacheSize;
};
}
} // namespace logger
29 changes: 23 additions & 6 deletions src/lemlog/logger/sinks/sd-card.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,12 @@
#include <fstream>

namespace logger {
SDCard::SDCard(std::string filename, bool logTimestamp) : filename("/usd/" + filename), logTimestamp(logTimestamp) {}
SDCard::SDCard(std::string filename, bool logTimestamp, int cacheSize)
: filename("/usd/" + filename),
logTimestamp(logTimestamp),
cacheSize(cacheSize) {
this->cache = std::vector<std::string>();
}

std::string SDCard::formatTimestamp(long long ms) {
// use the % operator to get the remainder of the division
Expand All @@ -25,8 +30,11 @@ void SDCard::send(Level level, std::string topic, std::string message) {
// output: <time> [LEVEL] (topic) message
std::string output = "";

if (this->logTimestamp) output += this->formatTimestamp((long long) pros::millis());
// if the timestamp is enabled, add it to the message
if (this->logTimestamp)
output += this->formatTimestamp((long long)pros::millis());

// add the level to the message
switch (level) {
case (Level::DEBUG): {
output += " [DEBUG]";
Expand All @@ -48,8 +56,17 @@ void SDCard::send(Level level, std::string topic, std::string message) {

output += " (" + topic + ") " + message + "\n";

std::ofstream file(this->filename);
file << output;
file.close();
// add the message to the cache
this->cache.push_back(output);

// if the cache is full, write it to the file
if (this->cache.size() >= this->cacheSize) {
std::ofstream file(this->filename, std::ios::app);
for (std::string& line : this->cache) {
file << line;
}
file.close();
this->cache.clear();
}
}
}
} // namespace logger
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