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Brings up a Neo4jGraphQL Java server.
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///usr/bin/env jbang "$0" "$@" ; exit $? | |
//JAVA 16 | |
//JAVAC_OPTIONS -source 16 | |
//DEPS info.picocli:picocli:4.6.1 | |
//DEPS io.javalin:javalin:3.13.9 | |
//DEPS org.neo4j.driver:neo4j-java-driver:4.3.3 | |
//DEPS org.neo4j:neo4j-graphql-java:1.3.0 | |
//DEPS com.fasterxml.jackson.core:jackson-databind:2.10.5 | |
//DEPS org.slf4j:slf4j-simple:1.7.31 | |
package com.example.graphqlplain; | |
import io.javalin.Javalin; | |
import picocli.CommandLine; | |
import java.io.File; | |
import java.io.IOException; | |
import java.io.UncheckedIOException; | |
import java.nio.file.Files; | |
import org.neo4j.driver.AuthTokens; | |
import org.neo4j.driver.Config; | |
import org.neo4j.driver.GraphDatabase; | |
import org.neo4j.driver.Logging; | |
import org.neo4j.driver.Record; | |
import org.neo4j.graphql.SchemaBuilder; | |
import org.neo4j.graphql.Translator; | |
/** | |
* Run with {@code jbang Neo4jGraphqlJava.java} | |
* to bring up a Neo4j GraphQL Java server connected against your local instance with a default schema. | |
* | |
* Run {@code jbang Neo4jGraphqlJava.java --help} to print available options. | |
* | |
* @author Michael Simons | |
*/ | |
@CommandLine.Command(name = "neo4j-graphql", mixinStandardHelpOptions = true, | |
description = "Starts a Neo4j-Graphql middleware.") | |
public class Neo4jGraphqlJava implements Runnable { | |
@CommandLine.Option(names = { "-u", "--user" }, description = "Neo4j user", defaultValue = "neo4j") | |
String user; | |
@CommandLine.Option(names = { "-p", | |
"--password" }, description = "Neo4j password", arity = "0..1", interactive = true, defaultValue = "secret") | |
char[] password; | |
@CommandLine.Option(names = { "-a", | |
"--address" }, description = "address and port to connect to", defaultValue = "neo4j://localhost:7687") | |
String address; | |
@CommandLine.Option(names = { "-P", "--port" }, description = "Port to listen on", defaultValue = "7000") | |
Integer port; | |
@CommandLine.Option(names = "--schema", arity = "0..1", description = "Schema definition") | |
File schema; | |
public static void main(String[] args) { | |
new CommandLine(new Neo4jGraphqlJava()).execute(args); | |
} | |
private String getSchema() { | |
if (this.schema != null) { | |
try { | |
return Files.readString(this.schema.toPath()); | |
} catch (IOException e) { | |
throw new UncheckedIOException(e); | |
} | |
} else { | |
return """ | |
type Person { | |
name: ID! | |
born: Int | |
actedIn: [Movie] @relation(name: "ACTED_IN") | |
} | |
type Movie { | |
title: ID! | |
released: Int | |
tagline: String | |
} | |
type Query { | |
person: [Person] | |
} | |
"""; | |
} | |
} | |
@Override | |
public void run() { | |
var driver = GraphDatabase.driver( | |
address, | |
AuthTokens.basic(user, new String(this.password)), | |
Config.builder().withLogging(Logging.slf4j()).build() | |
); | |
driver.verifyConnectivity(); | |
var graphql = new Translator(SchemaBuilder.buildSchema(getSchema())); | |
var server = Javalin.create() | |
.events(event -> event.serverStopping(() -> driver.close())) | |
.start(port); | |
server.post("/graphql", ctx -> { | |
if (ctx.contentLength() == 0) { | |
return; | |
} | |
graphql.translate(ctx.body()).stream().findFirst().ifPresent(cypher -> { | |
try (var session = driver.session()) { | |
var result = session | |
.writeTransaction(tx -> tx.run(cypher.getQuery(), cypher.getParams()).list(Record::asMap)); | |
ctx.json(result); | |
} | |
}); | |
}); | |
} | |
} |
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