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//! This module provides a Juniper Context for Warpgrapher GraphQL queries. The //! context contains a connection pool for the Neo4J database. use crate::engine::database::DatabasePool; use crate::engine::extensions::{Extension, Extensions}; use crate::engine::resolvers::{ResolverFunc, Resolvers}; use crate::engine::validators::Validators; use crate::Error; use juniper::Context; use std::collections::HashMap; use std::fmt::Debug; use std::fmt::Formatter; use std::slice::Iter; use std::sync::Arc; /// Juniper Context for Warpgrapher's GraphQL queries. The ['GraphQLContext'] is /// used to pass a connection pool for the database in to the resolvers. /// /// ['GraphQLContext']: ./struct.GraphQLContext.html /// /// # Examples /// /// ```rust,no_run /// # use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::GraphQLContext; /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<(), ()> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(()), /// Some(()), /// None, /// HashMap::new() /// ); /// # Ok(()) /// # } /// ``` pub struct GraphQLContext<GlobalCtx, RequestCtx> where GlobalCtx: GlobalContext, RequestCtx: RequestContext, { pool: DatabasePool, resolvers: Resolvers<GlobalCtx, RequestCtx>, validators: Validators, extensions: Extensions<GlobalCtx, RequestCtx>, global_ctx: Option<GlobalCtx>, request_ctx: Option<RequestCtx>, version: Option<String>, metadata: HashMap<String, String>, } impl<GlobalCtx, RequestCtx> GraphQLContext<GlobalCtx, RequestCtx> where GlobalCtx: GlobalContext, RequestCtx: RequestContext, { /// Creates a new context, used for providing additional information for use in Warpgrapher /// resolvers /// /// # Arguments /// /// * pool - the [`DatabasePool`] that provides connections to the graph storage back-end /// * resolvers - the [`Resolvers`] structure containing any custom resolvers provided as /// part of the Warpgrapher configuration /// * validators - the [`Validators`] structure containing any custom input validators /// provided as part of the Warpgrapher configuration /// * extensions - the [`Extensions`] structure containing any pre- or post-request hooks /// * global_ctx - an optional global context, implementing the [`GlobalContext`] trait, /// provided by the application using the Warpgrapher framework to pass application-specific /// global context to custom resolvers /// * request_ctx - an optional per-request context, implementing the [`RequestContext`] trait, /// provided by the application using the Warpgrapher framework to pass application-specific, /// request-specific context to custom resolvers /// * version - an optional version of the application service using the Warpgrapher framework, /// used to respond to the version static endpoint /// /// [`DatabasePool`]: ../database/enum.DatabasePool.html /// [`Extensions`]: ../extensions/type.Extensions.html /// [`GlobalContext`]: ./trait.GlobalContext.html /// [`RequestContext`]: ./trait.RequestContext.html /// [`Resolvers`]: ../resolvers/type.Resolvers.html /// [`Validators`]: ../validators/type.Validators.html /// /// # Examples /// /// ```rust,no_run /// # use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::GraphQLContext; /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<(), ()> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(()), /// Some(()), /// None, /// HashMap::new() /// ); /// # Ok(()) /// # } /// ``` #[allow(clippy::too_many_arguments)] pub fn new( pool: DatabasePool, resolvers: Resolvers<GlobalCtx, RequestCtx>, validators: Validators, extensions: Extensions<GlobalCtx, RequestCtx>, global_ctx: Option<GlobalCtx>, request_ctx: Option<RequestCtx>, version: Option<String>, metadata: HashMap<String, String>, ) -> GraphQLContext<GlobalCtx, RequestCtx> { GraphQLContext { pool, resolvers, validators, extensions, global_ctx, request_ctx, version, metadata, } } /// Returns a pool of database connections /// /// # Examples /// /// ```rust,no_run /// # use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::GraphQLContext; /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<(), ()> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(()), /// Some(()), /// None, /// HashMap::new() /// ); /// /// # #[cfg(feature = "neo4j")] /// let db_pool = gqlctx.pool(); /// # Ok(()) /// # } /// ``` pub fn pool(&self) -> &DatabasePool { &self.pool } /// Takes the name of a custom resolver and returns the function implementing that resolver /// /// # Errors /// /// Returns an [`Error`] variant [`ResolverNotFound`] if the context does not contain a /// resolver function associated with the name argument /// /// # Examples /// /// ```rust,no_run /// # #[cfg(feature = "neo4j")] /// use bolt_proto::Message; /// use std::collections::HashMap; /// use std::iter::FromIterator; /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::{DatabaseEndpoint, DatabasePool}; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::{Resolvers, ResolverFacade}; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::GraphQLContext; /// # use warpgrapher::engine::resolvers::ExecutionResult; /// # use warpgrapher::Error; /// /// # #[cfg(feature = "neo4j")] /// pub fn project_count(facade: ResolverFacade<(), ()>) -> ExecutionResult { /// if let DatabasePool::Neo4j(p) = facade.executor().context().pool() { /// let mut runtime = Runtime::new()?; /// let mut db = runtime.block_on(p.get())?; /// let query = "MATCH (n:Project) RETURN (n)"; /// runtime.block_on(db.run_with_metadata(query, None, None)) /// .expect("Expected successful query run."); /// /// let pull_meta = bolt_client::Metadata::from_iter(vec![("n", -1)]); /// let (response, records) = runtime.block_on(db.pull(Some(pull_meta)))?; /// match response { /// Message::Success(_) => (), /// message => return Err(Error::Neo4jQueryFailed { message }.into()), /// } /// /// facade.resolve_scalar(records.len() as i32) /// } else { /// panic!("Unsupported database."); /// } /// } /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// let mut resolvers: Resolvers<(), ()> = Resolvers::new(); /// # #[cfg(feature = "neo4j")] /// resolvers.insert("ProjectCount".to_string(), Box::new(project_count)); /// /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(()), /// Some(()), /// None, /// HashMap::new() /// ); /// /// # #[cfg(feature = "neo4j")] /// let gqlctx = gqlctx.resolver("CustomResolver"); /// # Ok(()) /// # } /// ``` pub fn resolver(&self, name: &str) -> Result<&ResolverFunc<GlobalCtx, RequestCtx>, Error> { self.resolvers .get(name) .map(|b| b.as_ref()) .ok_or_else(|| Error::ResolverNotFound { name: name.to_owned(), }) } /// Returns the set of custom input validation functions /// /// # Examples /// /// ```rust,no_run /// # use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::GraphQLContext; /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<(), ()> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(()), /// Some(()), /// None, /// HashMap::new() /// ); /// /// # #[cfg(feature = "neo4j")] /// let validators = gqlctx.validators(); /// # Ok(()) /// # } /// ``` pub fn validators(&self) -> &Validators { &self.validators } /// Returns an optional string for the version of the GraphQL service /// /// # Examples /// /// ```rust,no_run /// # use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::GraphQLContext; /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<(), ()> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(()), /// Some(()), /// Some("0.0.0".to_string()), /// HashMap::new() /// ); /// /// # #[cfg(feature = "neo4j")] /// assert_eq!(Some(&"0.0.0".to_string()), gqlctx.version()); /// # Ok(()) /// # } /// ``` pub fn version(&self) -> Option<&String> { self.version.as_ref() } /// Returns an iterator over the registered extensions, each offering potentially a pre-request /// and a post-request hook /// /// # Examples /// /// ```rust,no_run /// # use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::GraphQLContext; /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<(), ()> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(()), /// Some(()), /// Some("0.0.0".to_string()), /// HashMap::new() /// ); /// /// # #[cfg(feature = "neo4j")] /// let extensions = gqlctx.extensions(); /// # Ok(()) /// # } /// ``` pub fn extensions(&self) -> Iter<Arc<dyn Extension<GlobalCtx, RequestCtx>>> { self.extensions.iter() } /// Returns the global request context /// /// # Examples /// /// ```rust,no_run /// # #[cfg(feature = "neo4j")] /// # use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::{GlobalContext, GraphQLContext, RequestContext}; /// /// #[derive(Clone, Debug)] /// pub struct AppGlobalCtx { /// version: String, /// } /// /// impl GlobalContext for AppGlobalCtx {} /// #[derive(Clone, Debug)] /// pub struct AppRequestCtx { /// request_id: String, /// } /// /// impl RequestContext for AppRequestCtx { /// fn new() -> AppRequestCtx { /// AppRequestCtx { /// request_id: "".to_string() /// } /// } /// } /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<AppGlobalCtx, AppRequestCtx> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<AppGlobalCtx, AppRequestCtx> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(AppGlobalCtx { version: "0.0.0".to_string() }), /// Some(AppRequestCtx::new()), /// Some("0.0.0".to_string()), /// HashMap::new() /// ); /// /// # #[cfg(feature = "neo4j")] /// let global_context = gqlctx.global_context(); /// # Ok(()) /// # } /// ``` pub fn global_context(&self) -> Option<&GlobalCtx> { self.global_ctx.as_ref() } /// Returns the request-specific context /// /// # Examples /// /// ```rust,no_run /// # use std::collections::HashMap; /// # #[cfg(feature = "neo4j")] /// use tokio::runtime::Runtime; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::DatabaseEndpoint; /// # #[cfg(feature = "neo4j")] /// # use warpgrapher::engine::database::neo4j::Neo4jEndpoint; /// # use warpgrapher::engine::resolvers::Resolvers; /// # use warpgrapher::engine::validators::Validators; /// # use warpgrapher::engine::context::{GlobalContext, GraphQLContext, RequestContext}; /// /// #[derive(Clone, Debug)] /// pub struct AppGlobalCtx { /// version: String, /// } /// /// impl GlobalContext for AppGlobalCtx {} /// #[derive(Clone, Debug)] /// pub struct AppRequestCtx { /// request_id: String, /// } /// /// impl RequestContext for AppRequestCtx { /// fn new() -> AppRequestCtx { /// AppRequestCtx { /// request_id: "".to_string() /// } /// } /// } /// /// # fn main() -> Result<(), Box<dyn std::error::Error>> { /// # #[cfg(feature = "neo4j")] /// let mut runtime = Runtime::new()?; /// # #[cfg(feature = "neo4j")] /// let ne = Neo4jEndpoint::from_env()?; /// let resolvers: Resolvers<AppGlobalCtx, AppRequestCtx> = Resolvers::new(); /// let validators: Validators = Validators::new(); /// # #[cfg(feature = "neo4j")] /// let gqlctx: GraphQLContext<AppGlobalCtx, AppRequestCtx> = GraphQLContext::new( /// runtime.block_on(ne.pool())?, /// resolvers, /// validators, /// vec![], /// Some(AppGlobalCtx { version: "0.0.0".to_string() }), /// Some(AppRequestCtx::new()), /// Some("0.0.0".to_string()), /// HashMap::new() /// ); /// /// # #[cfg(feature = "neo4j")] /// let request_context = gqlctx.request_context(); /// # Ok(()) /// # } /// ``` pub fn request_context(&self) -> Option<&RequestCtx> { self.request_ctx.as_ref() } pub fn metadata(&self) -> &HashMap<String, String> { &self.metadata } } impl<GlobalCtx, RequestCtx> Context for GraphQLContext<GlobalCtx, RequestCtx> where GlobalCtx: GlobalContext, RequestCtx: RequestContext, { } impl<GlobalCtx, RequestCtx> Debug for GraphQLContext<GlobalCtx, RequestCtx> where GlobalCtx: GlobalContext, RequestCtx: RequestContext, { fn fmt(&self, f: &mut Formatter) -> std::fmt::Result { f.debug_struct("GraphQLContext") .field("pool", &self.pool) .field("extensions", &self.extensions) .field("global_ctx", &self.global_ctx) .field("request_ctx", &self.request_ctx) .field("version", &self.version) .finish() } } /// Trait that, when implemented, marks a struct as a global context, used to pass data to custom /// extensions and resolvers /// /// # Examples /// /// ```rust,no_run /// # use warpgrapher::engine::context::GlobalContext; /// /// #[derive(Clone, Debug)] /// struct AppContext { /// app_specific_config: String /// } /// /// impl GlobalContext for AppContext {} /// /// let ac = AppContext { app_specific_config: "".to_string() }; /// ``` pub trait GlobalContext: 'static + Clone + Debug + Send + Sync {} impl GlobalContext for () {} /// Trait that, when implemented, marks a struct as a request context, used to pass data to custom /// extensions and resolvers on a per-request basis /// /// # Examples /// /// ```rust,no_run /// # use warpgrapher::engine::context::RequestContext; /// /// #[derive(Clone, Debug)] /// struct AppRequestContext { /// session_token: String /// } /// /// impl RequestContext for AppRequestContext { /// fn new() -> Self { /// AppRequestContext { session_token: "".to_string() } /// } /// } /// /// let ac = AppRequestContext { session_token: "".to_string() }; /// ``` pub trait RequestContext: 'static + Clone + Debug + Send + Sync { fn new() -> Self; } impl RequestContext for () { fn new() {} } #[cfg(feature = "neo4j")] #[cfg(test)] mod tests { use super::GraphQLContext; use crate::engine::database::neo4j::Neo4jEndpoint; use crate::engine::database::DatabaseEndpoint; use crate::engine::resolvers::Resolvers; use crate::engine::validators::Validators; use std::collections::HashMap; use tokio::runtime::Runtime; /// Passes if the pool can be created without panicking #[test] fn engine_new() { let mut runtime = Runtime::new().expect("Expected new runtime."); let ne = Neo4jEndpoint::from_env().expect("Couldn't build database pool from env vars."); let resolvers: Resolvers<(), ()> = Resolvers::new(); let validators: Validators = Validators::new(); let _gqlctx: GraphQLContext<(), ()> = GraphQLContext::new( runtime .block_on(ne.pool()) .expect("Expected to unwrap Neo4J database pool."), resolvers, validators, vec![], Some(()), Some(()), None, HashMap::<String, String>::new(), ); } }