src/commands/xread.json


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{
    "XREAD": {
        "summary": "Returns messages from multiple streams with IDs greater than the ones requested. Blocks until a message is available otherwise.",
        "group": "stream",
        "since": "5.0.0",
        "arity": -4,
        "function": "xreadCommand",
        "get_keys_function": "xreadGetKeys",
        "command_flags": [
            "BLOCKING",
            "READONLY",
            "BLOCKING"
        ],
        "acl_categories": [
            "STREAM"
        ],
        "key_specs": [
            {
                "flags": [
                    "RO",
                    "ACCESS"
                ],
                "begin_search": {
                    "keyword": {
                        "keyword": "STREAMS",
                        "startfrom": 1
                    }
                },
                "find_keys": {
                    "range": {
                        "lastkey": -1,
                        "step": 1,
                        "limit": 2
                    }
                }
            }
        ],
        "arguments": [
            {
                "token": "COUNT",
                "name": "count",
                "type": "integer",
                "optional": true
            },
            {
                "token": "BLOCK",
                "name": "milliseconds",
                "type": "integer",
                "optional": true
            },
            {
                "name": "streams",
                "token": "STREAMS",
                "type": "block",
                "arguments": [
                    {
                        "name": "key",
                        "type": "key",
                        "key_spec_index": 0,
                        "multiple": true
                    },
                    {
                        "name": "ID",
                        "type": "string",
                        "multiple": true
                    }
                ]
            }
        ],
        "reply_schema": {
            "oneOf": [
                {
                    "description": "A map of key-value elements when each element composed of key name and the entries reported for that key",
                    "type": "object",
                    "patternProperties": {
                        "^.*$": {
                            "description": "The entries reported for that key",
                            "type": "array",
                            "items": {
                                "type": "array",
                                "minItems": 2,
                                "maxItems": 2,
                                "items": [
                                    {
                                        "description": "entry id",
                                        "type": "string",
                                        "pattern": "[0-9]+-[0-9]+"
                                    },
                                    {
                                        "description": "array of field-value pairs",
                                        "type": "array",
                                        "items": {
                                            "type": "string"
                                        }
                                    }
                                ]
                            }
                        }
                    }
                },
                {
                    "description": "If BLOCK option is given, and a timeout occurs, or there is no stream we can serve",
                    "type": "null"
                }
            ]
        }
    }
}