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from datetime import datetime, timedelta
from typing import Any, Dict, Optional
from graphql.error import GraphQLError
from graphql.language import ValueNode
from graphql.pyutils import inspect
from graphql.type import (
GraphQLArgument,
GraphQLField,
GraphQLInputField,
GraphQLInputObjectType,
GraphQLInt,
GraphQLList,
GraphQLObjectType,
GraphQLScalarType,
GraphQLSchema,
)
from graphql.utilities import value_from_ast_untyped
from gql import Client, gql
def serialize_datetime(value: Any) -> str:
if not isinstance(value, datetime):
raise GraphQLError("Cannot serialize datetime value: " + inspect(value))
return value.isoformat()
def parse_datetime_value(value: Any) -> datetime:
if isinstance(value, str):
try:
# Note: a more solid custom scalar should use dateutil.parser.isoparse
# Not using it here in the test to avoid adding another dependency
return datetime.fromisoformat(value)
except Exception:
raise GraphQLError("Cannot parse datetime value : " + inspect(value))
else:
raise GraphQLError("Cannot parse datetime value: " + inspect(value))
def parse_datetime_literal(
value_node: ValueNode, variables: Optional[Dict[str, Any]] = None
) -> datetime:
ast_value = value_from_ast_untyped(value_node, variables)
if not isinstance(ast_value, str):
raise GraphQLError("Cannot parse literal datetime value: " + inspect(ast_value))
return parse_datetime_value(ast_value)
DatetimeScalar = GraphQLScalarType(
name="Datetime",
serialize=serialize_datetime,
parse_value=parse_datetime_value,
parse_literal=parse_datetime_literal,
)
def resolve_shift_days(root, _info, time, days):
return time + timedelta(days=days)
def resolve_latest(root, _info, times):
return max(times)
def resolve_seconds(root, _info, interval):
print(f"interval={interval!r}")
return (interval["end"] - interval["start"]).total_seconds()
IntervalInputType = GraphQLInputObjectType(
"IntervalInput",
fields={
"start": GraphQLInputField(
DatetimeScalar,
default_value=datetime(2021, 11, 12, 11, 58, 13, 461161),
),
"end": GraphQLInputField(DatetimeScalar),
},
)
queryType = GraphQLObjectType(
name="RootQueryType",
fields={
"shiftDays": GraphQLField(
DatetimeScalar,
args={
"time": GraphQLArgument(DatetimeScalar),
"days": GraphQLArgument(GraphQLInt),
},
resolve=resolve_shift_days,
),
"latest": GraphQLField(
DatetimeScalar,
args={"times": GraphQLArgument(GraphQLList(DatetimeScalar))},
resolve=resolve_latest,
),
"seconds": GraphQLField(
GraphQLInt,
args={"interval": GraphQLArgument(IntervalInputType)},
resolve=resolve_seconds,
),
},
)
schema = GraphQLSchema(query=queryType)
def test_shift_days():
client = Client(schema=schema, parse_results=True, serialize_variables=True)
now = datetime.fromisoformat("2021-11-12T11:58:13.461161")
query = gql("query shift5days($time: Datetime) {shiftDays(time: $time, days: 5)}")
query.variable_values = {
"time": now,
}
result = client.execute(query)
print(result)
assert result["shiftDays"] == datetime.fromisoformat("2021-11-17T11:58:13.461161")
def test_shift_days_serialized_manually_in_query():
client = Client(schema=schema)
query = gql(
"""{
shiftDays(time: "2021-11-12T11:58:13.461161", days: 5)
}"""
)
result = client.execute(query, parse_result=True)
print(result)
assert result["shiftDays"] == datetime.fromisoformat("2021-11-17T11:58:13.461161")
def test_shift_days_serialized_manually_in_variables():
client = Client(schema=schema, parse_results=True)
query = gql("query shift5days($time: Datetime) {shiftDays(time: $time, days: 5)}")
query.variable_values = {
"time": "2021-11-12T11:58:13.461161",
}
result = client.execute(query)
print(result)
assert result["shiftDays"] == datetime.fromisoformat("2021-11-17T11:58:13.461161")
def test_latest():
client = Client(schema=schema, parse_results=True)
now = datetime.fromisoformat("2021-11-12T11:58:13.461161")
in_five_days = datetime.fromisoformat("2021-11-17T11:58:13.461161")
query = gql("query latest($times: [Datetime!]!) {latest(times: $times)}")
query.variable_values = {
"times": [now, in_five_days],
}
result = client.execute(query, serialize_variables=True)
print(result)
assert result["latest"] == in_five_days
def test_seconds():
client = Client(schema=schema)
now = datetime.fromisoformat("2021-11-12T11:58:13.461161")
in_five_days = datetime.fromisoformat("2021-11-17T11:58:13.461161")
query = gql(
"query seconds($interval: IntervalInput) {seconds(interval: $interval)}"
)
query.variable_values = {"interval": {"start": now, "end": in_five_days}}
result = client.execute(query, serialize_variables=True)
print(result)
assert result["seconds"] == 432000
def test_seconds_omit_optional_start_argument():
client = Client(schema=schema)
in_five_days = datetime.fromisoformat("2021-11-17T11:58:13.461161")
query = gql(
"query seconds($interval: IntervalInput) {seconds(interval: $interval)}"
)
query.variable_values = {"interval": {"end": in_five_days}}
result = client.execute(query, serialize_variables=True)
print(result)
assert result["seconds"] == 432000
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