io.polyglotted.common.web.GatewayResponse Maven / Gradle / Ivy

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package io.polyglotted.common.web;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Multimap;
import lombok.RequiredArgsConstructor;
import lombok.SneakyThrows;
import org.apache.http.impl.EnglishReasonPhraseCatalog;

import java.io.OutputStream;
import java.util.Map;

import static com.fasterxml.jackson.annotation.JsonInclude.Include.NON_EMPTY;
import static io.polyglotted.common.util.BaseSerializer.MAPPER;
import static io.polyglotted.common.util.MapBuilder.immutableMap;
import static io.polyglotted.common.util.MapBuilder.immutableMultimap;
import static org.apache.http.HttpHeaders.CONTENT_TYPE;
import static org.apache.http.HttpStatus.SC_INTERNAL_SERVER_ERROR;

@SuppressWarnings("WeakerAccess") @JsonAutoDetect @RequiredArgsConstructor
@JsonPropertyOrder({"statusCode", "statusDescription", "headers", "multiValueHeaders", "isBase64Encoded", "body"})
public class GatewayResponse {
    public final int statusCode;
    public final String statusDescription;
    public final boolean isBase64Encoded;
    public final String body;
    @JsonInclude(NON_EMPTY) public final Map headers;
    @JsonInclude(NON_EMPTY) public final Multimap multiValueHeaders;

    public static void sendError(boolean isLoadBalanced, OutputStream output, Exception ex) {
        sendResult(isLoadBalanced, output, ex instanceof WebHttpException ? ((WebHttpException) ex).httpStatus : SC_INTERNAL_SERVER_ERROR,
            ex.getMessage(), false, immutableMap(CONTENT_TYPE, "text/plain; charset=utf-8"));
    }

    @SneakyThrows public static void sendResult(boolean isLoadBalanced, OutputStream output, int status, String result,
                                                boolean isBase64, Map headers) {
        String desc = isLoadBalanced ? status + " " + EnglishReasonPhraseCatalog.INSTANCE.getReason(status, null) : null;
        ImmutableMultimap multiHeaders = isLoadBalanced ? immutableMultimap(headers) : immutableMultimap();
        MAPPER.writeValue(output, new GatewayResponse(status, desc, isBase64, result, headers, multiHeaders));
    }
}