/// <summary>
/// A special intermediate function for converting string chaining into real chaining.
/// </summary>
/// <param name="chainDataString"></param>
/// <param name="search"></param>
/// <param name="previousChains"></param>
/// <typeparam name="S"></typeparam>
/// <typeparam name="V"></typeparam>
/// <returns></returns>
protected Task ChainStringAsync <S, V>(ChainRequestString chainDataString, Func <S, Task <List <V> > > search, List <List <IIdView> > previousChains)
where S : IConstrainedSearcher where V : IIdView
{
var t = timer.StartTimer($"{chainDataString.endpoint} {string.Join(".", chainDataString.chains)}");
try
{
var chainData = new ChainRequest <S, V>(chainDataString)
{
retriever = search
};
try
{
chainData.baseSearch = JsonSerializer.Deserialize <S>(chainDataString.search, config.JsonOptions);
}
catch (Exception ex)
{
//I don't care too much about json deseralize errors, just the message. I don't even log it.
throw new BadRequestException(ex.Message + " (CHAIN REMINDER: json search comes last AFTER all . chaining in a request)");
}
return(ChainAsync(chainData, previousChains));
}
finally
{
timer.EndTimer(t);
}
}
/// <summary>
/// THE REAL PROPER CHAINING ENDPOINT! Will perform ONE chain request (after linking with previous chains)
/// </summary>
/// <param name="data"></param>
/// <param name="baggage"></param>
/// <typeparam name="S"></typeparam>
/// <typeparam name="V"></typeparam>
/// <returns></returns>
public async Task ChainAsync <S, V>(ChainRequest <S, V> data, List <List <IIdView> > previousChains)
where V : IIdView where S : IConstrainedSearcher
{
Dictionary <string, PropertyInfo> properties = null;
Type type = typeof(V);
//My poor design has led to this...
if (type == typeof(UserViewFull))
{
type = typeof(UserViewBasic);
}
var baseProperties = GetProperties(type);
//Before doing ANYTHING, IMMEDIATELY convert fields to actual properties. It's easy if they pass us null: they want everything.
if (data.fields == null)
{
properties = baseProperties.ToDictionary(x => x.Name, x => x);
}
else
{
var lowerFields = data.fields.Select(x => x.ToLower());
properties = baseProperties.Where(x => lowerFields.Contains(x.Name.ToLower())).ToDictionary(x => x.Name, x => x);
if (properties.Count != data.fields.Count)
{
throw new BadRequestException($"Unknown fields in list: {string.Join(",", data.fields)}");
}
}
//Parse the chains, get the ids. WARN: THIS IS DESTRUCTIVE TO DATA.BASESEARCH!!!
foreach (var c in data.chains)
{
LinkToSearch(c, previousChains, data.baseSearch);
}
var myResults = await data.retriever(data.baseSearch);
previousChains.Add(myResults.Cast <IIdView>().ToList());
//Only add ones that aren't in the list
foreach (var v in myResults)
{
if (!data.mergeList.Any(x => x.id == v.id))
{
var result = new TaggedChainResult()
{
id = v.id, result = new ExpandoObject()
};
foreach (var p in properties)
{
result.result.TryAdd(p.Key, p.Value.GetValue(v));
}
lock (data.mergeLock)
{
data.mergeList.Add(result);
}
}
}
}
