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Prevent server crash in handleClientReady

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The client might have disconnected between callbacks so don't try to
write to the session before checking this. The main callback of this
function now has a single check at its top.

Removed a redundant check halfway through the callback.

Also normalized use of client.id for the session index instead of a mix of
client.id and sessionId.

Added some explanatory comments.
This commit is contained in:
Richard Braakman 2012-09-28 23:03:42 +03:00
parent 413ddb393e
commit 2e72a1e489
1 changed files with 25 additions and 23 deletions
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24
src/node/handler/PadMessageHandler.js
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@ -882,6 +882,13 @@ function handleClientReady(client, message)
},
function(callback)
{
//Check that the client is still here. It might have disconnected between callbacks.
if(sessioninfos[client.id] === undefined)
{
callback();
return;
}
//Check if this author is already on the pad, if yes, kick the other sessions!
if(pad2sessions[padIds.padId])
{
@ -896,10 +903,9 @@ function handleClientReady(client, message)
}
//Save in sessioninfos that this session belonges to this pad
var sessionId=String(client.id);
sessioninfos[sessionId].padId = padIds.padId;
sessioninfos[sessionId].readOnlyPadId = padIds.readOnlyPadId;
sessioninfos[sessionId].readonly = padIds.readonly;
sessioninfos[client.id].padId = padIds.padId;
sessioninfos[client.id].readOnlyPadId = padIds.readOnlyPadId;
sessioninfos[client.id].readonly = padIds.readonly;
//check if there is already a pad2sessions entry, if not, create one
if(!pad2sessions[padIds.padId])
@ -908,7 +914,7 @@ function handleClientReady(client, message)
}
//Saves in pad2sessions that this session belongs to this pad
pad2sessions[padIds.padId].push(sessionId);
pad2sessions[padIds.padId].push(client.id);
//prepare all values for the wire
var atext = Changeset.cloneAText(pad.atext);
@ -973,9 +979,7 @@ function handleClientReady(client, message)
clientVars.userName = authorName;
}
if(sessioninfos[client.id] !== undefined)
{
//This is a reconnect, so we don't have to send the client the ClientVars again
//If this is a reconnect, we don't have to send the client the ClientVars again
if(message.reconnect == true)
{
//Save the revision in sessioninfos, we take the revision from the info the client send to us
@ -986,13 +990,11 @@ function handleClientReady(client, message)
{
//Send the clientVars to the Client
client.json.send({type: "CLIENT_VARS", data: clientVars});
//Save the revision in sessioninfos
//Save the current revision in sessioninfos, should be the same as in clientVars
sessioninfos[client.id].rev = pad.getHeadRevisionNumber();
}
//Save the revision and the author id in sessioninfos
sessioninfos[client.id].author = author;
}
//prepare the notification for the other users on the pad, that this user joined
var messageToTheOtherUsers = {