private static string? HashFunctionId()

in src/DotNetWorker.Core/FunctionMetadata/DefaultFunctionMetadata.cs [53:96]

36 lines of code
6 McCabe index (conditional complexity)


        private static string? HashFunctionId(DefaultFunctionMetadata function)
        {
            // We use uint to avoid the '-' sign when we .ToString() the result.
            // This function is adapted from https://github.com/Azure/azure-functions-host/blob/71ecbb2c303214f96d7e17310681fd717180bdbb/src/WebJobs.Script/Utility.cs#L847-L863
            static uint GetStableHash(string value)
            {
                unchecked
                {
                    uint hash = 23;
                    foreach (char c in value)
                    {
                        hash = (hash * 31) + c;
                    }

                    return hash;
                }
            }

            unchecked
            {
                bool atLeastOnePresent = false;
                uint hash = 17;

                if (function.Name is not null)
                {
                    atLeastOnePresent = true;
                    hash = hash * 31 + GetStableHash(function.Name);
                }

                if (function.ScriptFile is not null)
                {
                    atLeastOnePresent = true;
                    hash = hash * 31 + GetStableHash(function.ScriptFile);
                }

                if (function.EntryPoint is not null)
                {
                    atLeastOnePresent = true;
                    hash = hash * 31 + GetStableHash(function.EntryPoint);
                }

                return atLeastOnePresent ? hash.ToString() : null;
            }
        }