/// <summary>
/// Generates a test case function for the specified method.
/// </summary>
/// <param name="mg">The method for which a test case will be generated.</param>
/// <param name="rpcTypeName">The type name use for RPC dispatch.</param>
/// <returns>The root node in this test case function AST.</returns>
public static Tuple <Node, string> Generate(MethodGo mg, string rpcTypeName, string replyTypeName, string replyConvFuncName, string loggerVarName)
{
if (mg == null)
{
throw new ArgumentNullException(nameof(mg));
}
if (string.IsNullOrWhiteSpace(replyTypeName))
{
throw new ArgumentException(nameof(replyTypeName));
}
if (string.IsNullOrWhiteSpace(replyConvFuncName))
{
throw new ArgumentException(nameof(replyConvFuncName));
}
var errorVar = "err";
var jsonParamVar = "parameters";
var replyVar = "reply";
var operationId = mg.SerializedName.ToString();
if (!char.IsUpper(operationId[0]))
{
operationId = $"{char.ToUpperInvariant(operationId[0])}{operationId.Substring(1)}";
}
var rpcTypeVar = char.ToLowerInvariant(rpcTypeName[0]).ToString();
var func = FunctionSignature.Generate(new FuncParamSig(rpcTypeVar, TypeModifier.ByReference, rpcTypeName),
operationId, new[]
{
new FuncParamSig(jsonParamVar, TypeModifier.ByValue, "json.RawMessage"),
new FuncParamSig(replyVar, TypeModifier.ByReference, replyTypeName)
}, new[]
{
new FuncReturnSig(null, TypeModifier.ByValue, "error")
});
var funcBody = new OpenDelimiter(BinaryDelimiterType.Brace);
// generate a type used to unmarshal the parameters
string unmarshalVar = null;
var unmarshalType = GenerateTypeForParamsUnmarshal(mg);
funcBody.AddChild(unmarshalType.Item1);
funcBody.AddChild(new Terminal());
unmarshalVar = unmarshalType.Item2.ToLowerInvariant();
// do the unmarshaling and return on failure
funcBody.AddChild(VariableDecl.Generate(unmarshalVar, unmarshalType.Item2));
funcBody.AddChild(new Terminal());
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign, new Identifier(errorVar),
FunctionCall.Generate("json.Unmarshal", new[]
{
new FuncCallParam(new Identifier(jsonParamVar), TypeModifier.ByValue),
new FuncCallParam(new Identifier(unmarshalVar), TypeModifier.ByReference)
})));
funcBody.AddChild(new Terminal());
funcBody.AddChild(ErrorCheck.Generate(errorVar, OnError.ReturnError));
funcBody.AddChild(new Terminal());
var authVar = "auth";
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
DelimitedSequence.Generate(UnaryDelimiterType.Comma, new[]
{
new Identifier(authVar),
new Identifier(errorVar)
}),
FunctionCall.Generate($"{unmarshalVar}.{ReservedParamsFieldName}.Credentials.CreateBearerAuthorizer", null)));
funcBody.AddChild(new Terminal());
funcBody.AddChild(ErrorCheck.Generate(errorVar, OnError.ReturnError));
funcBody.AddChild(new Terminal());
// create the client and call the target function
var clientVar = "client";
// check if the client ctor has any parameters
List <FuncCallParam> clientParams = null;
if (!string.IsNullOrWhiteSpace(((MethodGroupGo)mg.MethodGroup).GlobalParameters))
{
clientParams = new List <FuncCallParam>();
var globalParams = ((MethodGroupGo)mg.MethodGroup).GlobalParameters.Split(new[] { ',' });
// each param is the var name followed by the type name, e.g. "subscriptionID string"
foreach (var globalParam in globalParams)
{
var paramName = globalParam.Substring(0, globalParam.IndexOf(' '));
clientParams.Add(new FuncCallParam(new Identifier($"{unmarshalVar}.{paramName.Capitalize()}"), TypeModifier.ByValue));
}
}
funcBody.AddChild(FunctionCall.Generate($"{loggerVarName}.Println", new[]
{
new FuncCallParam(new Literal <string>(operationId), TypeModifier.ByValue)
}));
funcBody.AddChild(new Terminal());
funcBody.AddChild(FunctionCall.Generate($"{loggerVarName}.Printf", new[]
{
new FuncCallParam(new Literal <string>("received %v\\n"), TypeModifier.ByValue),
new FuncCallParam(new Identifier(unmarshalVar), TypeModifier.ByValue)
}));
funcBody.AddChild(new Terminal());
// the client creation function name prefix is hard-coded in the Go generator
var clientCtorName = $"{mg.CodeModel.Namespace}.New";
if (!string.IsNullOrWhiteSpace(mg.MethodGroup.Name))
{
clientCtorName = $"{clientCtorName}{((MethodGroupGo)mg.MethodGroup).ClientName}";
}
funcBody.AddChild(BinaryOpSequence.Generate(
BinaryOperatorType.DeclareAndAssign,
new Identifier(clientVar),
FunctionCall.Generate(clientCtorName, clientParams)));
funcBody.AddChild(new Terminal());
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.Assignment,
new Identifier($"{clientVar}.Authorizer"), new Identifier(authVar)));
funcBody.AddChild(new Terminal());
var rChanVar = "rChan";
var eChanVar = "eChan";
var responseVar = "resp";
var rawResponseVar = "rawResp";
var isLro = mg.IsLongRunningOperation() && !mg.IsPageable;
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
DelimitedSequence.Generate(UnaryDelimiterType.Comma, new[]
{
new Identifier(isLro ? rChanVar : responseVar),
new Identifier(isLro ? eChanVar : errorVar)
}),
FunctionCall.Generate($"{clientVar}.{mg.Name}", GenerateApiCallParams(mg, unmarshalVar))));
funcBody.AddChild(new Terminal());
if (isLro)
{
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.Assignment,
new Identifier(errorVar), new Identifier($"<-{eChanVar}")));
funcBody.AddChild(new Terminal());
}
funcBody.AddChild(ErrorCheck.Generate(errorVar, OnError.ReturnError));
funcBody.AddChild(new Terminal());
if (isLro)
{
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
new Identifier(responseVar), new Identifier($"<-{rChanVar}")));
funcBody.AddChild(new Terminal());
}
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.DeclareAndAssign,
DelimitedSequence.Generate(UnaryDelimiterType.Comma, new[]
{
new Identifier(rawResponseVar),
new Identifier(errorVar)
}),
FunctionCall.Generate(replyConvFuncName, new[]
{
new FuncCallParam(new Identifier(mg.HasReturnValue() ? $"{responseVar}.Response" : $"{responseVar}"), TypeModifier.ByReference),
new FuncCallParam(mg.HasReturnValue() ? (Node) new Identifier(responseVar) : new Nil(), TypeModifier.ByValue)
})));
funcBody.AddChild(new Terminal());
funcBody.AddChild(FunctionCall.Generate($"{loggerVarName}.Printf", new[]
{
new FuncCallParam(new Literal <string>("response %v\\n"), TypeModifier.ByValue),
new FuncCallParam(new Identifier($"*{rawResponseVar}"), TypeModifier.ByValue)
}));
funcBody.AddChild(new Terminal());
funcBody.AddChild(BinaryOpSequence.Generate(BinaryOperatorType.Assignment,
new Identifier($"*{replyVar}"), new Identifier($"*{rawResponseVar}")));
funcBody.AddChild(new Terminal());
funcBody.AddChild(ReturnStatement.Generate(new[]
{
errorVar
}));
funcBody.AddClosingDelimiter();
func.AddChild(funcBody);
return(new Tuple <Node, string>(func, operationId));
}