2020-03-03 11:15:18 +00:00
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use crate::registry::Registry;
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2020-03-04 06:24:44 +00:00
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use crate::{ErrorWithPosition, GQLInputValue, GQLType, QueryError, Result};
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2020-03-01 10:54:34 +00:00
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use fnv::FnvHasher;
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2020-03-05 07:50:57 +00:00
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use graphql_parser::query::{
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2020-03-06 16:19:22 +00:00
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Directive, Field, FragmentDefinition, SelectionSet, Value, VariableDefinition,
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2020-03-05 07:50:57 +00:00
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};
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2020-03-01 10:54:34 +00:00
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use std::any::{Any, TypeId};
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2020-03-04 03:51:42 +00:00
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use std::collections::{BTreeMap, HashMap};
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2020-03-01 10:54:34 +00:00
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use std::hash::BuildHasherDefault;
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use std::ops::{Deref, DerefMut};
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2020-03-01 16:52:05 +00:00
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#[derive(Default)]
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2020-03-04 03:51:42 +00:00
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pub struct Variables(BTreeMap<String, Value>);
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2020-03-01 10:54:34 +00:00
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impl Deref for Variables {
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2020-03-04 03:51:42 +00:00
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type Target = BTreeMap<String, Value>;
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2020-03-01 10:54:34 +00:00
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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2020-03-05 00:39:56 +00:00
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impl DerefMut for Variables {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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2020-03-04 03:51:42 +00:00
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impl Variables {
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2020-03-05 00:39:56 +00:00
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pub(crate) fn parse_from_json(value: serde_json::Value) -> Result<Self> {
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2020-03-04 03:51:42 +00:00
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let gql_value = json_value_to_gql_value(value);
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if let Value::Object(obj) = gql_value {
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Ok(Variables(obj))
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} else {
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Ok(Default::default())
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}
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}
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}
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fn json_value_to_gql_value(value: serde_json::Value) -> Value {
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match value {
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serde_json::Value::Null => Value::Null,
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serde_json::Value::Bool(n) => Value::Boolean(n),
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serde_json::Value::Number(n) if n.is_f64() => Value::Float(n.as_f64().unwrap()),
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serde_json::Value::Number(n) => Value::Int((n.as_i64().unwrap() as i32).into()),
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serde_json::Value::String(s) => Value::String(s),
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serde_json::Value::Array(ls) => Value::List(
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ls.into_iter()
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.map(|value| json_value_to_gql_value(value))
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.collect(),
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),
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serde_json::Value::Object(obj) => Value::Object(
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obj.into_iter()
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.map(|(name, value)| (name, json_value_to_gql_value(value)))
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.collect(),
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),
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}
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}
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2020-03-01 10:54:34 +00:00
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#[derive(Default)]
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pub struct Data(HashMap<TypeId, Box<dyn Any + Sync + Send>, BuildHasherDefault<FnvHasher>>);
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impl Data {
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pub fn insert<D: Any + Send + Sync>(&mut self, data: D) {
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self.0.insert(TypeId::of::<D>(), Box::new(data));
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}
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}
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2020-03-03 03:48:00 +00:00
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pub type ContextSelectionSet<'a> = ContextBase<'a, &'a SelectionSet>;
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pub type Context<'a> = ContextBase<'a, &'a Field>;
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2020-03-01 10:54:34 +00:00
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2020-03-03 03:48:00 +00:00
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pub struct ContextBase<'a, T> {
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2020-03-01 10:54:34 +00:00
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pub(crate) item: T,
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pub(crate) variables: Option<&'a Variables>,
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2020-03-04 03:51:42 +00:00
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pub(crate) variable_definitions: Option<&'a [VariableDefinition]>,
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2020-03-03 11:15:18 +00:00
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pub(crate) registry: &'a Registry,
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pub(crate) data: &'a Data,
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pub(crate) fragments: &'a HashMap<String, &'a FragmentDefinition>,
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2020-03-01 10:54:34 +00:00
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}
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2020-03-03 03:48:00 +00:00
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impl<'a, T> Deref for ContextBase<'a, T> {
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2020-03-01 10:54:34 +00:00
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.item
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}
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}
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2020-03-03 03:48:00 +00:00
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impl<'a, T> ContextBase<'a, T> {
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2020-03-01 17:15:05 +00:00
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#[doc(hidden)]
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2020-03-03 03:48:00 +00:00
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pub fn with_item<R>(&self, item: R) -> ContextBase<'a, R> {
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ContextBase {
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2020-03-01 10:54:34 +00:00
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item,
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variables: self.variables,
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2020-03-04 03:51:42 +00:00
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variable_definitions: self.variable_definitions,
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registry: self.registry.clone(),
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data: self.data,
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2020-03-05 07:50:57 +00:00
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fragments: self.fragments,
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2020-03-01 10:54:34 +00:00
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}
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}
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2020-03-07 10:03:19 +00:00
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pub fn data<D: Any + Send + Sync>(&self) -> &D {
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2020-03-05 00:39:56 +00:00
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self.data
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.0
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.get(&TypeId::of::<D>())
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.and_then(|d| d.downcast_ref::<D>())
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2020-03-07 10:03:19 +00:00
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.expect("The specified data type does not exist.")
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2020-03-01 10:54:34 +00:00
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}
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2020-03-05 07:50:57 +00:00
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2020-03-04 03:51:42 +00:00
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fn resolve_input_value(&self, value: Value) -> Result<Value> {
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if let Value::Variable(var_name) = value {
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let def = self
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.variable_definitions
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.and_then(|defs| defs.iter().find(|def| def.name == var_name.as_str()));
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if let Some(def) = def {
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if let Some(var_value) = self.variables.map(|vars| vars.get(&def.name)).flatten() {
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return Ok(var_value.clone());
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2020-03-04 06:24:44 +00:00
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} else if let Some(default) = &def.default_value {
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return Ok(default.clone());
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2020-03-04 03:51:42 +00:00
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}
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}
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return Err(QueryError::VarNotDefined {
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var_name: var_name.clone(),
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}
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.into());
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} else {
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Ok(value)
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}
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}
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2020-03-04 06:24:44 +00:00
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#[doc(hidden)]
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2020-03-05 09:06:14 +00:00
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pub fn is_skip(&self, directives: &[Directive]) -> Result<bool> {
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for directive in directives {
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2020-03-04 06:24:44 +00:00
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if directive.name == "skip" {
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if let Some(value) = directive
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.arguments
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.iter()
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.find(|(name, _)| name == "if")
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.map(|(_, value)| value)
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{
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let value = self.resolve_input_value(value.clone())?;
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let res: bool = GQLInputValue::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: bool::qualified_type_name(),
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actual: value,
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}
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.with_position(directive.position)
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})?;
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if res {
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return Ok(true);
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}
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} else {
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return Err(QueryError::RequiredDirectiveArgs {
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directive: "@skip",
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arg_name: "if",
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arg_type: "Boolean!",
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}
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.with_position(directive.position)
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.into());
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}
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} else if directive.name == "include" {
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if let Some(value) = directive
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.arguments
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.iter()
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.find(|(name, _)| name == "if")
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.map(|(_, value)| value)
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{
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let value = self.resolve_input_value(value.clone())?;
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let res: bool = GQLInputValue::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: bool::qualified_type_name(),
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actual: value,
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}
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.with_position(directive.position)
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})?;
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if !res {
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return Ok(true);
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}
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} else {
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return Err(QueryError::RequiredDirectiveArgs {
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directive: "@include",
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arg_name: "if",
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arg_type: "Boolean!",
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}
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.with_position(directive.position)
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.into());
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}
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} else {
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return Err(QueryError::UnknownDirective {
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name: directive.name.clone(),
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}
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.with_position(directive.position)
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.into());
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}
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}
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Ok(false)
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}
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2020-03-01 10:54:34 +00:00
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}
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2020-03-05 09:06:14 +00:00
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impl<'a> ContextBase<'a, &'a Field> {
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#[doc(hidden)]
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pub fn param_value<T: GQLInputValue, F: FnOnce() -> Value>(
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&self,
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name: &str,
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2020-03-05 13:34:31 +00:00
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default: F,
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2020-03-05 09:06:14 +00:00
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) -> Result<T> {
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match self
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.arguments
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.iter()
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.find(|(n, _)| n == name)
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.map(|(_, v)| v)
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.cloned()
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{
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Some(value) => {
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let value = self.resolve_input_value(value)?;
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let res = GQLInputValue::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: T::qualified_type_name(),
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actual: value,
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}
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.with_position(self.item.position)
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})?;
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Ok(res)
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}
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2020-03-05 13:34:31 +00:00
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None => {
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2020-03-05 09:06:14 +00:00
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let value = default();
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let res = GQLInputValue::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: T::qualified_type_name(),
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actual: value.clone(),
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}
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.with_position(self.item.position)
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})?;
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Ok(res)
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}
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}
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}
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2020-03-06 15:58:43 +00:00
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2020-03-07 03:27:44 +00:00
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#[doc(hidden)]
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2020-03-06 15:58:43 +00:00
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pub fn result_name(&self) -> String {
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self.item.alias.clone().unwrap_or_else(|| self.name.clone())
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}
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2020-03-05 09:06:14 +00:00
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}
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