Legacy/fetchRemote: Difference between revisions
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{{Note|This page only contains legacy implementations. For current implementation check [[fetchRemote]]}} | {{Note|This page only contains legacy implementations. For current implementation check [[fetchRemote]]}} | ||
==Syntax== | |||
<syntaxhighlight lang="lua"> | |||
bool fetchRemote ( string URL, [ string queueName = "default" ], [ int connectionAttempts = 10, int connectTimeout = 10000 ], function callbackFunction, [ string postData = "", bool postIsBinary = false ], [ arguments... ] ) | |||
</syntaxhighlight> | |||
===Required Arguments=== | |||
*'''URL:''' A full URL in the format ''<nowiki>http://hostname/path/file.ext</nowiki>''. A port can be specified with a colon followed by a port number appended to the hostname. | |||
*'''callbackFunction:''' This is the function that should receive the data returned from the remote server. The callback argument list should be: | |||
**'''''responseData''''' - A string containing the remote response or "ERROR" if there was a problem | |||
**'''''error''''' - A number containing the error number or zero if there was no error. A list of possible error values are: | |||
{{Error_codes_for_callRemote_and_fetchRemote}} | |||
<div style="padding-left:19px;"> | |||
*'''''arguments...''''' - The arguments that were passed into fetchRemote | |||
</div> | |||
===Optional Arguments=== | |||
{{New items|4.0153|1.5.3-9.11270| | |||
*'''queueName:''' Name of the queue to use. Any name can be used. If not set, the queue name is "default". Requests in the same queue are processed in order, one at a time. | |||
}} | |||
*'''connectionAttempts:''' Number of times to retry if the remote host does not respond. ''In the case of a non-responding remote server, each connection attempt will timeout after 10 seconds. Therefore, the default setting of 10 connection attempts means it will be 100 seconds before your script gets a callback about the error. Reducing this value to 2 for example, will decrease that period to 20 seconds'' | |||
*'''connectTimeout:''' Number of milliseconds each connection attempt will take before timing out | |||
*'''postData:''' A string specifying any data you want to send to the remote HTTP server. | |||
*'''postIsBinary :''' A boolean specifying if the data is text, or binary. | |||
*'''arguments:''' Any arguments you may want to pass to the callback. | |||
{{New items|5.0154|1.5.4-9.11342| | {{New items|5.0154|1.5.4-9.11342| | ||
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<syntaxhighlight lang="lua"> | <syntaxhighlight lang="lua"> | ||
bool fetchRemote ( string URL[, table options ], callback callbackFunction[, table callbackArguments ] ) | bool fetchRemote ( string URL[, table options ], callback callbackFunction[, table callbackArguments ] ) | ||
</syntaxhighlight> | </syntaxhighlight> | ||
===Required Arguments=== | ===Required Arguments=== | ||
Line 52: | Line 78: | ||
==Example== | ==Example== | ||
This example shows you how you can fetch an image from a web page, and transfer it to a particular client: | |||
<section name="Server" class="server" show="true"> | |||
<syntaxhighlight lang="lua"> | |||
function startImageDownload( playerToReceive ) | |||
fetchRemote ( "http://www.example.com/image.jpg", myCallback, "", false, playerToReceive ) | |||
end | |||
function myCallback( responseData, errorCode, playerToReceive ) | |||
if errorCode == 0 then | |||
triggerClientEvent( playerToReceive, "onClientGotImage", resourceRoot, responseData ) | |||
end | |||
end | |||
</syntaxhighlight> | |||
</section> | |||
<section name="Client" class="client" show="true"> | |||
<syntaxhighlight lang="lua"> | |||
addEvent( "onClientGotImage", true ) | |||
addEventHandler( "onClientGotImage", resourceRoot, | |||
function( pixels ) | |||
if myTexture then | |||
destroyElement( myTexture ) | |||
end | |||
myTexture = dxCreateTexture( pixels ) | |||
end | |||
) | |||
addEventHandler("onClientRender", root, | |||
function() | |||
if myTexture then | |||
local w,h = dxGetMaterialSize( myTexture ) | |||
dxDrawImage( 200, 100, w, h, myTexture ) | |||
end | |||
end | |||
) | |||
</syntaxhighlight> | |||
</section> | |||
<br/> | |||
{{New items|5.0154|1.5.4-9.11413| | {{New items|5.0154|1.5.4-9.11413| | ||
Example sending email via a web service (adopted from examples on https://documentation.mailgun.com/en/latest/user_manual.html) | Example sending email via a web service (adopted from examples on https://documentation.mailgun.com/en/latest/user_manual.html) |
Revision as of 17:43, 7 November 2024
This function allows you to post and receive data from HTTP servers. The calls are asynchronous so you do not get an immediate result from the call, instead a callback function you specify is called when the download completes.
In the case when the call fails, a string containing "ERROR" followed by an integer containing the error reason will be passed to the callback function. The reason for failure will be similar to errors found with websites - file not found, server not found and timeouts.
If you are using fetchRemote to connect to a PHP script, you can use file_get_contents('php://input') to read the postData sent from this function.
Syntax
bool fetchRemote ( string URL, [ string queueName = "default" ], [ int connectionAttempts = 10, int connectTimeout = 10000 ], function callbackFunction, [ string postData = "", bool postIsBinary = false ], [ arguments... ] )
Required Arguments
- URL: A full URL in the format http://hostname/path/file.ext. A port can be specified with a colon followed by a port number appended to the hostname.
- callbackFunction: This is the function that should receive the data returned from the remote server. The callback argument list should be:
- responseData - A string containing the remote response or "ERROR" if there was a problem
- error - A number containing the error number or zero if there was no error. A list of possible error values are:
- 1-89: See cURL website or its mirror at cURL errors
- 400-599: See HTTP status codes
- 1002: Download aborted
- 1003: Failed to initialize
- 1004: Unable to parse url
- 1005: Unable to resolve host name
- 1006: Destination IP not allowed
- 1007: File error
- arguments... - The arguments that were passed into fetchRemote
Optional Arguments
- connectionAttempts: Number of times to retry if the remote host does not respond. In the case of a non-responding remote server, each connection attempt will timeout after 10 seconds. Therefore, the default setting of 10 connection attempts means it will be 100 seconds before your script gets a callback about the error. Reducing this value to 2 for example, will decrease that period to 20 seconds
- connectTimeout: Number of milliseconds each connection attempt will take before timing out
- postData: A string specifying any data you want to send to the remote HTTP server.
- postIsBinary : A boolean specifying if the data is text, or binary.
- arguments: Any arguments you may want to pass to the callback.
Returns
Example
This example shows you how you can fetch an image from a web page, and transfer it to a particular client:
function startImageDownload( playerToReceive ) fetchRemote ( "http://www.example.com/image.jpg", myCallback, "", false, playerToReceive ) end function myCallback( responseData, errorCode, playerToReceive ) if errorCode == 0 then triggerClientEvent( playerToReceive, "onClientGotImage", resourceRoot, responseData ) end end
addEvent( "onClientGotImage", true ) addEventHandler( "onClientGotImage", resourceRoot, function( pixels ) if myTexture then destroyElement( myTexture ) end myTexture = dxCreateTexture( pixels ) end ) addEventHandler("onClientRender", root, function() if myTexture then local w,h = dxGetMaterialSize( myTexture ) dxDrawImage( 200, 100, w, h, myTexture ) end end )
Changelog
Version | Description |
---|
1.3.1-9.04605 | Added connectionAttempts argument |
1.3.2 | Added client side |
1.5.3-9.11270 | Added queueName argument |
1.5.4-9.11342 | Added alternative syntax |
1.5.4-9.11413 | Added formFields |
See Also
- abortRemoteRequest
- call
- fetchRemote
- getResourceConfig
- getResourceDynamicElementRoot
- getResourceExportedFunctions
- getResourceFromName
- getResourceName
- getResourceRootElement
- getResourceState
- getThisResource
- getRemoteRequests
- getRemoteRequestInfo