Fix manual string query

src/telliot_feeds/dtypes/value_type.py

@@ -24,7 +24,7 @@ class ValueType(Serializable):
     """
 
     # ABI Encoding type string
-    abi_type: str = "uint256"
+    abi_type: str = "string"
 
     #: True if the value should be encoded using packed bytes format.
     packed: bool = False

src/telliot_feeds/queries/string_query.py

@@ -4,14 +4,30 @@
 # Copyright (c) 2021-, Tellor Development Community
 # Distributed under the terms of the MIT License.
 from dataclasses import dataclass
+from typing import Any
 from typing import Optional
 
+from eth_abi import decode
+from eth_abi import encode
+
 from telliot_feeds.dtypes.value_type import ValueType
-from telliot_feeds.queries.json_query import JsonQuery
+from telliot_feeds.queries.abi_query import AbiQuery
+
+
+class StringQueryValueType(ValueType):
+    """A ValueType for string queries."""
+
+    def encode(self, value: str) -> Any:
+        """Encode a string value."""
+        return encode([self.abi_type], [value])  # type: ignore
+
+    def decode(self, bytes_val: bytes) -> Any:
+        """Decode bytes into a string value."""
+        return decode([self.abi_type], bytes_val)  # type: ignore
 
 
 @dataclass
-class StringQuery(JsonQuery):
+class StringQuery(AbiQuery):
     """Static Oracle Query
 
     A text query supports a question in the form of an arbitrary
@@ -21,7 +37,13 @@ class StringQuery(JsonQuery):
     #: Static query text
     text: Optional[str]
 
+    def __init__(self, text: Optional[str]):
+        self.text = text
+
+    #: ABI used for encoding/decoding parameters
+    abi = [{"name": "text", "type": "string"}]
+
     @property
-    def value_type(self) -> ValueType:
+    def value_type(self) -> StringQueryValueType:
         """Returns a default text response type."""
-        return ValueType(abi_type="string", packed=False)
+        return StringQueryValueType()

tests/queries/test_string_query.py

@@ -0,0 +1,19 @@
+from telliot_feeds.queries.string_query import StringQuery
+
+
+def test_string_query_data():
+
+    q = StringQuery("What is the meaning of life")
+
+    expected_value = "Please refer to: https://en.wikipedia.org/wiki/Meaning_of_life"
+    expected_value_encoded = "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003e506c6561736520726566657220746f3a2068747470733a2f2f656e2e77696b6970656469612e6f72672f77696b692f4d65616e696e675f6f665f6c6966650000"  # noqa: E501
+    response_encoded = q.value_type.encode(expected_value)
+    response_decoded = q.value_type.decode(bytes.fromhex(expected_value_encoded))[0]
+
+    assert response_encoded.hex() == expected_value_encoded
+    assert response_decoded == expected_value
+
+    expected_query_data = "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"  # noqa: E501
+    expected_query_id = "5ad9f178a75e92c8beb8e1e6e2956377ad50f2288c9a82ccfdc69a18651deff5"
+    assert q.query_data.hex() == expected_query_data
+    assert q.query_id.hex() == expected_query_id