用户功能
通过以下方式执行 JavaScript 函数TFCALL或TFCALLASYNC
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都TFCALL函数名称后面的命令参数将传递给函数回调。以下示例说明如何实现一个简单函数，该函数返回 string 或 hash 类型的键的值：
#!js api_version=1.0 name=lib
redis.registerFunction('my_get', function(client, key_name){
if (client.call('type', key_name) == 'string') {
return client.call('get', key_name);
}
if (client.call('type', key_name) == 'hash') {
return client.call('hgetall', key_name);
}
throw "Unsupported type";
});
Example of running the preceding function:
127.0.0.1:6379> set x 1
OK
127.0.0.1:6379> TFCALL lib.my_get 1 x
"1"
127.0.0.1:6379> hset h a b x y
(integer) 2
127.0.0.1:6379> TFCALL lib.my_get 1 h
1) "a"
2) "b"
3) "x"
4) "y"
It is also possible to get all the function arguments as a JS array. This is how we can extend the above example to accept multiple keys and return their values:
#!js api_version=1.0 name=lib
redis.registerFunction('my_get', function(client, ...keys){
var results = [];
keys.forEach((key_name)=> {
if (client.call('type', key_name) == 'string') {
results.push(client.call('get', key_name));
return;
}
if (client.call('type', key_name) == 'hash') {
results.push(client.call('hgetall', key_name));
return;
}
results.push("Unsupported type");
}
);
return results;
});
Run example:
127.0.0.1:6379> TFCALL foo.my_get 2 x h
1) "1"
2) 1) "a"
2) "b"
3) "x"
4) "y"