在Spring Boot中使用WebClient调用grapql突变API

using webclient to call the grapql mutation API in spring boot(在Spring Boot中使用WebClient调用grapql突变API)

问题描述

我在调用Spring Boot中的GraphQL突变API时卡住了。让我解释一下我的场景，我有两个微服务，一个是AuditConsumer服务，它使用来自active MQ的消息，另一个是GraphQL层，它只是从使用服务中获取数据并将其放入数据库中。当我尝试使用GraphQL游乐场或邮递员推送数据时，一切都很好。如何从AuditConsumer服务推送数据。在AuditConsumer eService中，我尝试将突变API作为字符串发送。负责将其发送到GraphQL层的方法是

public Mono<String> sendLogsToGraphQL(String logs){
        return webClient
                .post()
                .uri("http://localhost:8080/logs/createEventLog")
                .bodyValue(logs)
                .retrieve()
                .bodyToMono(String.class);
    }  

注意：我也尝试将数据作为对象传递，但没有用。 String logs将从activeMQ分配给它。我发送的数据是；

{
    "hasError": false,
    "message": "Hello There",
    "sender": "Ali Ahmad",
    "payload": {
        "type": "String",
        "title": "Topoic",
        "description": "This is the demo description of the activemqq"
    },
    "serviceInfo":{
        "version": "v1",
        "date": "2021-05-18T08:44:17.8237608+05:00",
        "serverStatus": "UP",
        "serviceName": "IdentityService"
    }
}

突变将类似；

mutation($eventLog:EventLogInput){
  createEventLog(eventLog: $eventLog){
    hasError
    message
    payload{
      title,
      description
    }
  }
}

$eventLog的正文为；

{
  "eventLog": {
    "hasError": false,
    "message": "Hello There",
    "sender": "Ali Ahmad",
    "payload": {
        "type": "String",
        "title": "Topoic",
        "description": "This is the demo description of the activemqq"
    },
    "serviceInfo":{
        "version": "v1",
        "date": "2021-05-18T08:44:17.8237608+05:00",
        "serverStatus": "UP",
        "serviceName": "IdentityService"
    }
}
}

编辑 通过将Consumer服务更新为；，遵循以下答案。

@Component
public class Consumer {
    @Autowired
    private AuditService auditService;

    private final String MUTATION_QUERY = "mutation($eventLog: EventLogInput){
" +
            "createEventLog(eventLog: $eventLog){
" +
            "hasError
" +
            "}
" +
            "}";

    @JmsListener(destination = "Audit.queue")
    public void consumeLogs(String logs) {
        Gson gson = new Gson();
        Object jsonObject = gson.fromJson(logs, Object.class);
        Map<String, Object> graphQlBody = new HashMap<>();
        graphQlBody.put("query", MUTATION_QUERY);
        graphQlBody.put("variables", "{eventLog: " + jsonObject+ "}");
        auditService.sendLogsToGraphQL(graphQlBody);
    }
}

现在，`sendLogsToGraphQL‘将变为。

public void sendLogsToGraphQL(Map<String, String> logs) {
        log.info("Logs: {} ", logs);
        Mono<String> stringMono = webClient
                .post()
                .uri("http://localhost:8080/graphql")
                .bodyValue(BodyInserters.fromValue(logs))
                .retrieve()
                .bodyToMono(String.class);
        log.info("StringMono: {}", stringMono);
        return stringMono;
    }

数据未发送到具有指定URL的GraphQL层。

推荐答案

您必须在POST请求中将query和Body作为变量发送，如here

graphQlBody = { "query" : mutation_query, "variables" : { "eventLog" : event_log_json } }

然后在webClient中可以通过多种方式发送正文

public Mono<String> sendLogsToGraphQL(Map<String,Object> body){
    return webClient
            .post()
            .uri("http://localhost:8080/logs/createEventLog")
            .bodyValue(BodyInserters.fromValue(body))
            .retrieve()
            .bodyToMono(String.class);
}  

这里我只展示了使用Map<String,Object>来形成GraphQL请求体，但您也可以使用query和variables

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