For a given Buffer or Stream, this module will attempt to determine the total length of the stream contents. It currently supports Buffers, `fs` streams, `http` responses, and `request` objects, and allows for specifying custom stream types.
npm install stream-lengthAttempts to determine the total content length of a Stream or Buffer.
Supports both Promises and nodebacks.
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* Buffers
* fs.createReadStream streams
* http.request and http.get responses
* request requests
* combined-stream2 streams
Using Promises:
``javascript
var streamLength = require("stream-length");
Promise.try(function(){
return streamLength(fs.createReadStream("README.md"));
})
.then(function(result){
console.log("The length of README.md is " + result);
})
.catch(function(err){
console.log("Could not determine length. Error: " + err.toString());
});
`
Using nodebacks:
`javascript
var streamLength = require("stream-length");
streamLength(fs.createReadStream("README.md"), {}, function(err, result){
if(err)
{
console.log("Could not determine length. Error: " + err.toString());
}
else
{
console.log("The length of README.md is " + result);
}
});
`
Custom lengthRetrievers:
`javascript`
Promise.try(function(){
return streamLength(fs.createReadStream("README.md"), [
function(stream, callback){
doSomethingWith(stream, function(err, len){
callback(err ? err : len);
})
}
]);
})
.then(function(result){
console.log("The length of README.md is " + result);
})
.catch(function(err){
console.log("Could not determine length. Error: " + err.toString());
});
Determines the length of stream, which can be a supported type of Stream or a Buffer. Optionally you can specify options:
* __lengthRetrievers__: An array of (potentially asynchronous) functions for establishing stream lengths. You can specify one or more of these if you wish to extend stream-lengths list of supported Stream types. Each retriever function is called with a signature of (stream, callback) where stream is the stream in question, and callback can be called with the result. If an Error occurs, simply pass the Error to the callback instead of the value.
If you define a callback`, it will be treated as a nodeback and called when the function completes. If you don't, the function will return a Promise that resolves when the function completes.