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using System;
using System.Net;
using System.Threading.Tasks;
using System.Collections.Generic;
using VNLib.Net.Http;
using VNLib.Plugins.Essentials.Extensions;
using static VNLib.Plugins.Essentials.Sessions.ISessionExtensions;
#nullable enable
namespace VNLib.Plugins.Essentials.Sessions.Memory
{
internal class MemorySession : SessionBase
{
private readonly Dictionary<string, string> DataStorage;
private readonly MemorySessionStore SessionStore;
public MemorySession(IPAddress ipAddress, MemorySessionStore SessionStore)
{
//Set the initial is-new flag
DataStorage = new Dictionary<string, string>(10);
this.SessionStore = SessionStore;
//Get new session id
SessionID = SessionStore.NewSessionID;
UserIP = ipAddress;
SessionType = SessionType.Web;
Created = DateTimeOffset.UtcNow;
//Init
IsNew = true;
}
//Store in memory directly
public override IPAddress UserIP { get; protected set; }
//Session type has no backing store, so safe to hard-code it's always web
public override SessionType SessionType => SessionType.Web;
protected override ValueTask<Task?> UpdateResource(bool isAsync, IHttpEvent state)
{
//if invalid is set, invalide the current session
if (Flags.IsSet(INVALID_MSK))
{
//Clear storage, and regenerate the sessionid
DataStorage.Clear();
RegenId(state);
//Reset ip-address
UserIP = state.Server.GetTrustedIp();
//Update created-time
Created = DateTimeOffset.UtcNow;
//Re-initialize the session to the state of the current connection
this.InitNewSession(state.Server);
//Modified flag doesnt matter since there is no write-back
}
else if (Flags.IsSet(REGEN_ID_MSK))
{
//Regen id without modifying the data store
RegenId(state);
}
//Clear flags
Flags.ClearAll();
//Memory session always completes
return ValueTask.FromResult<Task?>(null);
}
private void RegenId(IHttpEvent entity)
{
//Get a new session-id
string newId = SessionStore.NewSessionID;
//Update the cache entry
SessionStore.UpdateRecord(newId, this);
//store new sessionid
SessionID = newId;
//set cookie
SessionStore.SetSessionCookie(entity, this);
}
protected override Task OnEvictedAsync()
{
//Clear all session data
DataStorage.Clear();
return Task.CompletedTask;
}
protected override string IndexerGet(string key)
{
return DataStorage.GetValueOrDefault(key, string.Empty);
}
protected override void IndexerSet(string key, string value)
{
//Check for special keys
switch (key)
{
//For tokens/login hashes, we can set the upgrade flag
case TOKEN_ENTRY:
case LOGIN_TOKEN_ENTRY:
Flags.Set(REGEN_ID_MSK);
break;
}
DataStorage[key] = value;
}
}
}
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