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#include "ingestor.hpp"
#include "sql.hpp"
#include "util.hpp"
#include <connection.h>
#include <dbTypes.h>
#include <modifycommand.h>
#include <ranges>
#include <scn/scan.h>
#include <syslog.h>
#include <utility>
#include <zlib.h>
namespace DB {
template<>
void
DB::Command::bindParam(unsigned int idx, const WebStat::Entity & entity)
{
bindParamI(idx, entity.first);
}
}
namespace WebStat {
namespace {
Crc32Value
crc32(const std::string_view value)
{
return static_cast<Crc32Value>(::crc32(::crc32(0, Z_NULL, 0), reinterpret_cast<const Bytef *>(value.data()),
static_cast<uInt>(value.length())));
}
Entity
addCrc32(const std::string_view value)
{
return {crc32(value), value};
}
std::optional<Entity>
addCrc32o(const std::optional<std::string_view> value)
{
return value.transform(addCrc32);
}
auto
crc32ScanValues(const Ingestor::ScanValues & values)
{
return std::apply(
[](auto &&... value) {
return std::make_tuple(addCrc32(value...[0]), value...[1], value...[2], value...[3],
addCrc32(value...[4]), addCrc32o(value...[5]), value...[6], value...[7], value...[8],
value...[9], addCrc32o(value...[10]), addCrc32o(value...[11]));
},
values);
}
}
Ingestor::Ingestor(const std::string_view hostname, DB::ConnectionPtr dbconn) :
hostnameId {crc32(hostname)}, dbconn {std::move(dbconn)}
{
storeEntities({
std::make_pair(hostnameId, hostname),
});
}
Ingestor::ScanResult
Ingestor::scanLogLine(std::string_view input)
{
return scn::scan< // Field : Apache format specifier : example
std::string_view, // virtual_host : %v : some.host.name
std::string_view, // remoteip : %a : 1.2.3.4 (or ipv6)
uint64_t, // request_time : %{usec}t : 123456790
std::string_view, // method : %m : GET
QuotedString, // URL : "%u" : "/foo/bar"
QueryString, // query_string : "%q" : "?query=string" or ""
std::string_view, // protocol : %r : HTTPS/2.0
unsigned short, // status : %>s : 200
unsigned int, // size : %B : 1234
unsigned int, // duration : %D : 1234
CLFString, // referrer : "%{Referer}i" : "https://google.com/whatever" or "-"
CLFString // user_agent : "%{User-agent}i" : "Chromium v123.4" or "-"
>(input, R"({} {} {} {:[A-Z]} {} {} {} {} {} {} {} {})");
}
void
Ingestor::ingestLog(std::FILE * input)
{
while (auto line = scn::scan<std::string>(input, "{:[^\n]}\n")) {
linesRead++;
ingestLogLine(line->value());
}
}
void
Ingestor::ingestLogLine(const std::string_view line)
{
if (auto result = scanLogLine(line)) {
linesParsed++;
const auto values = crc32ScanValues(result->values());
std::optional<DB::TransactionScope> dbtx;
if (const auto newEnts = newEntities(values); newEnts.front()) {
dbtx.emplace(*dbconn);
storeEntities(newEnts);
}
storeLogLine(values);
}
else {
syslog(LOG_WARNING, "Discarded line: [%.*s]", static_cast<int>(line.length()), line.data());
linesDiscarded++;
}
}
template<typename... T>
Ingestor::NewEntities
Ingestor::newEntities(const std::tuple<T...> & values) const
{
Ingestor::NewEntities rtn;
auto next = rtn.begin();
visit(
[this, &next]<typename X>(const X & entity) {
auto addNewIfReqd = [&next, this](auto && entity) mutable {
if (!existingEntities.contains(entity.first)) {
*next++ = entity;
}
return 0;
};
if constexpr (std::is_same_v<X, Entity>) {
addNewIfReqd(entity);
}
else if constexpr (std::is_same_v<X, std::optional<Entity>>) {
entity.transform(addNewIfReqd);
}
},
values);
return rtn;
}
void
Ingestor::storeEntities(const std::span<const std::optional<Entity>> values) const
{
std::ranges::for_each(
values | std::views::take_while(&std::optional<Entity>::has_value), [this](auto && entity) {
auto insert = dbconn->modify(SQL::ENTITY_INSERT, SQL::ENTITY_INSERT_OPTS);
insert->bindParamI(0, entity->first);
insert->bindParamS(1, entity->second);
insert->execute();
existingEntities.emplace(entity->first);
});
}
template<typename... T>
void
Ingestor::storeLogLine(const std::tuple<T...> & values) const
{
auto insert = dbconn->modify(SQL::ACCESS_LOG_INSERT, SQL::ACCESS_LOG_INSERT_OPTS);
insert->bindParam(0, hostnameId);
std::apply(
[&insert](auto &&... value) {
unsigned int param = 1;
(insert->bindParam(param++, value), ...);
},
values);
insert->execute();
}
}
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