public static ServerMethodPluginRegistration Create(string pluginAssemblyInstanceId, PluginInfo pluginInfo)
{
var reg = new ServerMethodPluginRegistration(pluginInfo.Assembly, pluginInfo.TypeInfo, pluginInfo.Guid, pluginAssemblyInstanceId);
var classLevelAttrib = pluginInfo.TypeInfo.GetCustomAttribute(typeof(ServerMethodAttribute)) as ServerMethodAttribute;
// static methods not supported
var methods = pluginInfo.TypeInfo.GetMethods(BindingFlags.Public /* | BindingFlags.Static*/ | BindingFlags.Instance);
string classLevelNamespace = classLevelAttrib?.Namespace;
var serverMethodCollection = (from mi in methods
select new
{
MethodInfo = mi,
ServerMethodAttribute = mi.GetCustomAttribute(typeof(ServerMethodAttribute)) as ServerMethodAttribute
})
.Where(m => m.ServerMethodAttribute != null);
if (serverMethodCollection.Count() == 0)
{
SessionLog.Warning($"No server method's found in plugin '{pluginInfo.Name}' ({pluginInfo.Guid}) from assembly {pluginInfo.Assembly.FullName}. Add a [ServerMethod] attribute to the methods you want to expose.");
}
else
{
foreach (var m in serverMethodCollection)
{
string ns = m.ServerMethodAttribute?.Namespace;
if (ns == null)
{
ns = classLevelNamespace;
}
reg.AddMethod(m.MethodInfo.Name, ns, m.MethodInfo);
}
}
reg.ScriptGenerator = ServerMethodScriptGenerator.Create(reg, pluginInfo);
return(reg);
}
public (plugin.ServerMethodPlugin, ServerMethodRegistrationMethod /*matched Method*/, string /*error*/) GetServerMethodPluginInstance(string nameSpace,
string methodName, Dictionary <string, string> inputParameters)
{
// find all registered ServerMethods for this app
var registrations = ServerMethodManager.GetRegistrationsForApp(this.Application);
// TODO: To support overloading we need to match name + best fit parameter list
var methodCandidates = registrations.SelectMany(reg => reg.Methods)
.Where(m => ((nameSpace == null && m.Namespace == null) || (m.Namespace?.Equals(nameSpace, StringComparison.Ordinal) ?? false)) && m.Name.Equals(methodName, StringComparison.Ordinal))
.Select(m => m);
if (methodCandidates.Count() == 0)
{
return(null, null, "Method name not found.");
}
var weightedMethodList = new List <(decimal /*weight*/, string /*error*/, ServerMethodRegistrationMethod)>();
// find the best matching overload (if any)
foreach (var regMethod in methodCandidates)
{
var methodParameters = regMethod.AssemblyMethodInfo.GetParameters();
if (inputParameters.Count > methodParameters.Length)
{
weightedMethodList.Add((1M, "Too many parameters specified", regMethod));
continue;
}
var joined = from methodParam in methodParameters
join inputParam in inputParameters on methodParam.Name equals inputParam.Key into grp
from parm in grp.DefaultIfEmpty()
select new { HasMatch = parm.Key != null, Param = methodParam };
var matched = joined.Where(e => e.HasMatch);
var notmatched = joined.Where(e => !e.HasMatch);
var expectedCnt = methodParameters.Count();
var matchedCnt = matched.Count();
// out/ref/optional parameters are added as extra credit below (but does not contribute to actual weight)
var outRefSum = (from p in joined
where (p.Param.IsOut || p.Param.IsOptional || p.Param.ParameterType.IsByRef) && !p.HasMatch
select 1.0M).Sum();
if (matchedCnt == expectedCnt || matchedCnt + outRefSum == expectedCnt)
{
weightedMethodList.Add((matchedCnt, null, regMethod));
}
else
{
//weightedMethodList.Add((matchedCnt, $"Following parameters not specified: {string.Join("\r\n", notmatched.Select(nm => nm.Param.Name))}", regMethod));
weightedMethodList.Add((matchedCnt, "Parameter mismatch", regMethod));
}
}
var bestMatch = weightedMethodList.OrderByDescending(k => k.Item1).FirstOrDefault();
if (!string.IsNullOrWhiteSpace(bestMatch.Item2))
{
var parms = bestMatch.Item3.AssemblyMethodInfo.GetParameters();
var parmDesc = "(no parameters)";
if (parms.Length > 0)
{
parmDesc = string.Join("\r\n", parms.Select(p => $"{p.Name} ({p.ParameterType.ToString()})")); // TODO: Provide "easy to read" description for type, e.g. nullabe Int32 can be something like 'int?' and 'List<string>' just 'string[]'
}
return(null, bestMatch.Item3, $"Failed to find suitable overload.\r\nError: {bestMatch.Item2}\r\nBest match requires parameters:\r\n{parmDesc}");
}
var matchedRegMethod = bestMatch.Item3;
var cacheKey = $"{matchedRegMethod.Registration.PluginAssemblyInstanceId}; {matchedRegMethod.Registration.TypeInfo.FullName}";
plugin.ServerMethodPlugin pluginInstance = null;
lock (ServerMethodInstanceCache)
{
if (ServerMethodInstanceCache.ContainsKey(cacheKey))
{
pluginInstance = ServerMethodInstanceCache[cacheKey];
}
else // instantiate a new instance
{
try
{
pluginInstance = (plugin.ServerMethodPlugin)matchedRegMethod.Registration.Assembly.CreateInstance(matchedRegMethod.Registration.TypeInfo.FullName);
var initMethod = typeof(plugin.ServerMethodPlugin).GetMethod("InitSM", BindingFlags.Instance | BindingFlags.NonPublic);
if (initMethod != null)
{
initMethod.Invoke(pluginInstance, new object[] {
new Func <SqlConnection>(() => {
if (this.ExecutionConnection != null)
{
var con = new SqlConnection(this.ExecutionConnection.ConnectionStringDecrypted);
con.Open();
return(con);
}
return(new SqlConnection());
})
});
}
else
{
SessionLog.Warning($"Failed to find InitSM method on plugin {matchedRegMethod.Registration.TypeInfo.FullName} from assembly {matchedRegMethod.Registration.Assembly.FullName}. Make sure the correct version of the jsdal plugin is used and that you derive from the correct base class (should be ServerMethodPlugin).");
}
var setGetServicesFuncMethod = typeof(plugin.PluginBase).GetMethod("SetGetServicesFunc", BindingFlags.Instance | BindingFlags.NonPublic);
if (setGetServicesFuncMethod != null)
{
setGetServicesFuncMethod.Invoke(pluginInstance, new object[] { new Func <Type, plugin.PluginService>(serviceType =>
{
if (serviceType == typeof(plugin.BlobStoreBase))
{
return(BlobStore.Instance);
}
return(null);
}) });
}
ServerMethodManager.RegisterInstanceUse(this, matchedRegMethod);
ServerMethodInstanceCache.Add(cacheKey, pluginInstance);
}
catch (Exception ex)
{
SessionLog.Error($"Failed to instantiate plugin {matchedRegMethod.Registration.TypeInfo.FullName} from assembly {matchedRegMethod.Registration.Assembly.FullName}. See exception that follows.");
SessionLog.Exception(ex);
}
}
} // lock
return(pluginInstance, matchedRegMethod, null);
}
