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index.ts
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index.ts
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import { DynamoDB } from 'aws-sdk';
import * as https from 'https';
export const ATTRIBUTE_TYPES = {
STRING: "S",
NUMBER: "N",
BINARY: "B",
STRING_SET: "SS",
NUMBER_SET: "NS",
BINARY_SET: "BS",
MAP: "M",
LIST: "L",
NULL: "NULL",
BOOLEAN: "BOOL"
}
const attributeMappers = {
[ATTRIBUTE_TYPES.STRING]: (val: any) => {
if (typeof val === 'string') {
return val;
}
},
[ATTRIBUTE_TYPES.NUMBER]: (val: any) => {
if (typeof val === 'number') {
return val.toString();
}
},
[ATTRIBUTE_TYPES.BINARY]: (val: any) => {
if (typeof val === 'string') {
return val;
}
},
[ATTRIBUTE_TYPES.STRING_SET]: (val: any) => {
if (val instanceof Array && val.every(v => typeof v === 'string')) {
return val;
}
},
[ATTRIBUTE_TYPES.NUMBER_SET]: (val: any) => {
if (val instanceof Array && val.every(v => typeof v === 'number')) {
return val.map(v => v.toString());
}
},
[ATTRIBUTE_TYPES.BINARY_SET]: (val: any) => {
if (val instanceof Array && val.every(v => typeof v === 'string')) {
return val.toString();
}
},
[ATTRIBUTE_TYPES.MAP]: (val: any) => {
return val;
},
[ATTRIBUTE_TYPES.LIST]: (val: any) => {
if (val instanceof Array) {
return val;
}
},
[ATTRIBUTE_TYPES.NULL]: (val: any) => {
return true;
},
[ATTRIBUTE_TYPES.BOOLEAN]: (val: any) => {
return !!val
}
}
export function getDynamoDBInstance() {
return new DynamoDB({
httpOptions: {
agent: new https.Agent({
rejectUnauthorized: true,
keepAlive: true
})
}
})
}
export function toPromise<T, R, V>(func: (param: T, cb: (err: any, data: V) => void) => R, param: T) {
return new Promise((resolve, reject) => {
func(param, function (err, data) {
if (err !== null) {
return void reject(err);
}
resolve(data);
})
})
}
export function createSchemaMapper(schema: any) {
return (obj: any): any => {
return Object.entries(obj).reduce((prev, [key, value]) => {
const dataType = schema[key];
if (dataType && !Object.values(ATTRIBUTE_TYPES).includes(dataType) && obj[key]) {
return Object.assign({}, prev, {
[key]: {
[ATTRIBUTE_TYPES.MAP]: createSchemaMapper(schema[key])(obj[key])
}
});
}
if (dataType) {
return Object.assign({}, prev, {
[key]: {
[dataType]: attributeMappers[dataType](value)
}
})
}
return prev
}, {})
}
}