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Add pluggable propagation model support via dlopen #255

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Add pluggable propagation model support via dlopen #255

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42 changes: 37 additions & 5 deletions src/libemane/frameworkphy.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,7 @@
#include "tworaypropagationmodelalgorithm.h"
#include "precomputedpropagationmodelalgorithm.h"

#include <dlfcn.h>
#include <iterator>

namespace
Expand Down Expand Up @@ -264,10 +265,11 @@ void EMANE::FrameworkPHY::initialize(Registrar & registrar)
EMANE::ConfigurationProperties::DEFAULT,
{"precomputed"},
"Defines the pathloss mode of operation:"
" precomputed, 2ray or freespace.",
" precomputed, 2ray or freespace are built-in."
" Any other value loads"
" libpropagationmodel<name>.so as a plugin.",
1,
1,
"^(precomputed|2ray|freespace)$");
1);

configRegistrar.registerNumeric<double>("systemnoisefigure",
EMANE::ConfigurationProperties::DEFAULT,
Expand Down Expand Up @@ -458,7 +460,6 @@ void EMANE::FrameworkPHY::configure(const ConfigurationUpdate & update)
{
std::string sPropagationModel{item.second[0].asString()};

// regex has already validated values
if(sPropagationModel == "precomputed")
{
pPropagationModelAlgorithm_.reset(new PrecomputedPropagationModelAlgorithm{id_});
Expand All @@ -467,10 +468,41 @@ void EMANE::FrameworkPHY::configure(const ConfigurationUpdate & update)
{
pPropagationModelAlgorithm_.reset(new TwoRayPropagationModelAlgorithm{id_});
}
else
else if(sPropagationModel == "freespace")
{
pPropagationModelAlgorithm_.reset(new FreeSpacePropagationModelAlgorithm{id_});
}
else
{
// load propagation model plugin: libpropagationmodel<name>.so
std::string sLibName{"libpropagationmodel" + sPropagationModel + ".so"};

void * pHandle = dlopen(sLibName.c_str(), RTLD_NOW);

if(!pHandle)
{
throw makeException<ConfigureException>(
"Failed to load propagation model plugin %s: %s",
sLibName.c_str(),
dlerror());
}

using CreateFunc =
PropagationModelAlgorithm * (*)(NEMId, const ConfigurationUpdate &);

auto createFunc =
reinterpret_cast<CreateFunc>(dlsym(pHandle, "createPropagationModel"));

if(!createFunc)
{
dlclose(pHandle);
throw makeException<ConfigureException>(
"Propagation model plugin %s missing createPropagationModel symbol",
sLibName.c_str());
}

pPropagationModelAlgorithm_.reset(createFunc(id_, update));
}

LOGGER_STANDARD_LOGGING(pPlatformService_->logService(),
INFO_LEVEL,
Expand Down
2 changes: 2 additions & 0 deletions src/libemane/propagationmodelalgorithm.h
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,8 @@

namespace EMANE
{
class LocationInfo;

class PropagationModelAlgorithm
{
public:
Expand Down