static void APIHelloWorld(Messaging::Context&, Marshal::Object& response)
{
// log server
logs.info() << "[method:hello_world] sending hello world !";
// the response
response["message"] = "Hellow world !";
}
int main()
{
// Welcome !
logs.notice() << "Yuni DBI Example";
logs.info() << "using the SQLite default adapter";
logs.info(); // empty line
return RunExample() ? 0 : EXIT_FAILURE;
}
static bool RunExample()
{
// our connection pool
DBI::ConnectorPool connectors;
// database location
logs.info() << "opening the database file";
auto error = connectors.open(new DBI::Adapter::SQLite(), "dbi-example.db");
if (error)
{
logs.error() << "impossible to establish a connection to the database";
return false;
}
// begin a new transaction
auto tx = connectors.begin();
// create a new table if not already exists
logs.info() << "creating the table 'example'";
tx.perform("CREATE TABLE IF NOT EXISTS example (x INTEGER PRIMARY KEY);");
// truncate the table, if it already exists
logs.info() << "truncating the table";
tx.truncate("example");
// fill it with some values
logs.info() << "inserting some data";
tx.perform("INSERT INTO example (x) VALUES (42), (3), (-1), (-10), (-3);");
// iterating through a result set
{
uint rowindex = 0;
logs.info();
logs.info() << "iterating through all values";
auto stmt = tx.prepare("SELECT * FROM example WHERE x > $1 ORDER BY x");
stmt.bind(0, -5); // x > -5
stmt.execute();
// iterate through all values
stmt.each([&] (DBI::Row& row) -> bool
{
sint64 x = row[0].asInt64();
logs.info() << " :: resultset: in row " << (++rowindex) << ": x = " << x;
return true; // continue
});
}
// commit changes
logs.info() << "commit";
if (DBI::errNone != (error = tx.commit()))
{
logs.error() << "commit failed";
return false;
}
return true;
}
static bool StartService(Messaging::Service& service)
{
logs.info() << "starting";
Net::Error error = service.start();
switch (error)
{
case Net::errNone:
break;
default:
logs.fatal() << "impossible to start the service: " << error;
return false;
}
logs.info() << "examples:";
logs.info() << "# curl -i -X GET 'http://localhost:6042/hello_world'";
logs.info() << "# curl -i -X GET 'http://localhost:6042/sum?a=50&b=42'";
logs.info() << "<ctrl> + C to quit";
logs.info(); // empty line for beauty
return true;
}
static void APISum(Messaging::Context& context, Marshal::Object& response)
{
// our parameters
double a, b;
if (not context.params["a"].to(a) or not context.params["b"].to(b))
{
// the parameters are not valid, exiting with a 400 status code
// (Bad Request, The request cannot be fulfilled due to bad syntax.)
// see http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
context.httpStatus = 400;
// log server
logs.error() << "[method:sum] invalid parameters";
return;
}
// log server
logs.info() << "[method:sum] " << a << " + " << b << " = " << (a + b);
// the response
response["a"] = a;
response["b"] = b;
response["sum"] = (a + b);
}
int main(int, char**)
{
// Welcome !
logs.notice() << "Yuni REST Server Example";
logs.info() << "http://www.libyuni.org";
logs.info(); // empty line
// The service itself
Messaging::Service service;
// Prepare the API
PrepareTheAPI(service);
// Preparing all transports
PrepareTransports(service);
// Starting the new service
if (not StartService(service))
return EXIT_FAILURE;
// Waiting for the end of the server
service.wait();
return 0;
}