@env0/dynamo-easy/dist/_esm2015/dynamo/request/get/get.request.js

DynamoDB client for NodeJS and browser with a fluent api to build requests. We take care of the type mapping between JS and DynamoDB, customizable trough typescript decorators.

import { promiseTap } from '../../../helper/promise-tap.function';
import { createLogger } from '../../../logger/logger';
import { createKeyAttributes, fromDb } from '../../../mapper/mapper';
import { resolveAttributeNames } from '../../expression/functions/attribute-names.function';
import { StandardRequest } from '../standard.request';
/**
 * Request class for the GetItem operation.
 */
export class GetRequest extends StandardRequest {
    constructor(dynamoDBWrapper, modelClazz, partitionKey, sortKey) {
        super(dynamoDBWrapper, modelClazz);
        this.logger = createLogger('dynamo.request.GetRequest', modelClazz);
        this.params.Key = createKeyAttributes(this.metadata, partitionKey, sortKey);
    }
    /**
     * Determines the read consistency model: If set to true, then the operation uses strongly consistent reads; otherwise, the operation uses eventually consistent reads.
     */
    consistentRead(consistentRead = true) {
        this.params.ConsistentRead = consistentRead;
        return this;
    }
    projectionExpression(...attributesToGet) {
        // tslint:disable-next-line:no-unnecessary-callback-wrapper
        const resolved = attributesToGet.map(a => resolveAttributeNames(a));
        this.params.ProjectionExpression = resolved.map(attr => attr.placeholder).join(', ');
        Object.values(resolved).forEach(r => {
            this.params.ExpressionAttributeNames = Object.assign({}, this.params.ExpressionAttributeNames, r.attributeNames);
        });
        return this;
    }
    execFullResponse() {
        this.logger.debug('request', this.params);
        return this.dynamoDBWrapper.getItem(this.params)
            .then(promiseTap(response => this.logger.debug('response', response)))
            .then(getItemResponse => {
            const response = Object.assign({}, getItemResponse);
            if (getItemResponse.Item) {
                response.Item = fromDb(getItemResponse.Item, this.modelClazz);
            }
            else {
                response.Item = null;
            }
            return response;
        })
            .then(promiseTap(response => this.logger.debug('mapped item', response.Item)));
    }
    /**
     * execute request and return the parsed item
     */
    exec() {
        this.logger.debug('request', this.params);
        return this.dynamoDBWrapper.getItem(this.params)
            .then(promiseTap(response => this.logger.debug('response', response)))
            .then(response => {
            if (response.Item) {
                return fromDb(response.Item, this.modelClazz);
            }
            else {
                return null;
            }
        })
            .then(promiseTap(item => this.logger.debug('mapped item', item)));
    }
}
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