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Plugin: Add hooks for log init and writing.

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The two hooks being added are:

void HookLogInit(const std::string& writer, const std::string& instantiating_filter, bool local, bool remote, const logging::WriterBackend::WriterInfo& info, int num_fields, const threading::Field* const* fields);

which is called when a writer is being instantiated and contains
information about the fields being logged, as well as

bool HookLogWrite(const std::string& writer, const std::string& filter, const logging::WriterBackend::WriterInfo& info, int num_fields, const threading::Field* const* fields, threading::Value** vals);

which is called for each log line being written by each writer. It
contains all the data being written. The data can be changed in the
function call and lines can be prevented from being written.

This commit also fixes a few small problems with plugin hooks itself,
and extends the tests that were already there, besides introducing tests
for the added functionality.
This commit is contained in:
Johanna Amann 2017-02-27 10:01:14 -08:00
parent 2c2c9c9052
commit 684ea8aa37
16 changed files with 689 additions and 39 deletions
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60
testing/btest/plugins/logging-hooks-plugin/src/Plugin.cc Normal file
View file

@ -0,0 +1,60 @@
#include "Plugin.h"
#include <Func.h>
#include <Event.h>
#include <Conn.h>
#include <threading/Formatter.h>
namespace plugin { namespace Log_Hooks { Plugin plugin; } }
using namespace plugin::Log_Hooks;
plugin::Configuration Plugin::Configure()
{
round = 0;
EnableHook(HOOK_LOG_INIT);
EnableHook(HOOK_LOG_WRITE);
plugin::Configuration config;
config.name = "Log::Hooks";
config.description = "Exercises Log hooks";
config.version.major = 1;
config.version.minor = 0;
return config;
}
void Plugin::HookLogInit(const std::string& writer, const std::string& instantiating_filter, bool local, bool remote, const logging::WriterBackend::WriterInfo& info, int num_fields, const threading::Field* const* fields)
{
ODesc d;
d.Add("{");
for ( int i=0; i < num_fields; i++ )
{
const threading::Field* f = fields[i];
if ( i > 0 )
d.Add(", ");
d.Add(f->name);
d.Add(" (");
d.Add(f->TypeName());
d.Add(")");
}
d.Add("}");
fprintf(stderr, "%.6f %-15s %s %d/%d %s\n", network_time, "| HookLogInit", info.path, local, remote, d.Description());
}
bool Plugin::HookLogWrite(const std::string& writer, const std::string& filter, const logging::WriterBackend::WriterInfo& info, int num_fields, const threading::Field* const* fields, threading::Value** vals)
{
round++;
if ( round == 1 ) // do not output line
return false;
else if ( round == 2 )
vals[0]->val.int_val = 0;
else if ( round == 3 )
vals[1]->present = false;
return true;
}