|
|
@ -15,20 +15,33 @@ function scan() { |
|
|
|
|
|
|
|
// Update the cursor position for the next scan
|
|
|
|
cursor = res[0]; |
|
|
|
// get the SCAN result for this iteration
|
|
|
|
var keys = res[1]; |
|
|
|
|
|
|
|
// From <http://redis.io/commands/scan>:
|
|
|
|
// 'An iteration starts when the cursor is set to 0,
|
|
|
|
// and terminates when the cursor returned by the server is 0.'
|
|
|
|
if (cursor === '0') { |
|
|
|
return console.log('Iteration complete'); |
|
|
|
} |
|
|
|
// Remember: more or less than COUNT or no keys may be returned
|
|
|
|
// See http://redis.io/commands/scan#the-count-option
|
|
|
|
// Also, SCAN may return the same key multiple times
|
|
|
|
// See http://redis.io/commands/scan#scan-guarantees
|
|
|
|
// Additionally, you should always have the code that uses the keys
|
|
|
|
// before the code checking the cursor.
|
|
|
|
if (keys.length > 0) { |
|
|
|
console.log('Array of matching keys', keys); |
|
|
|
} |
|
|
|
|
|
|
|
if (res[1].length > 0) { |
|
|
|
console.log('Array of matching keys', res[1]); |
|
|
|
// It's important to note that the cursor and returned keys
|
|
|
|
// vary independently. The scan is never complete until redis
|
|
|
|
// returns a non-zero cursor. However, with MATCH and large
|
|
|
|
// collections, most iterations will return an empty keys array.
|
|
|
|
|
|
|
|
// Still, a cursor of zero DOES NOT mean that there are no keys.
|
|
|
|
// A zero cursor just means that the SCAN is complete, but there
|
|
|
|
// might be one last batch of results to process.
|
|
|
|
|
|
|
|
// From <http://redis.io/commands/scan>:
|
|
|
|
// 'An iteration starts when the cursor is set to 0,
|
|
|
|
// and terminates when the cursor returned by the server is 0.'
|
|
|
|
if (cursor === '0') { |
|
|
|
return console.log('Iteration complete'); |
|
|
|
} |
|
|
|
|
|
|
|
return scan(); |
|
|
|