aws-xray-sdk-postgres

Requirements

• AWS X-Ray SDK Core
• Postgres 6.1.0 or greater

AWS X-Ray and Postgres

The AWS X-Ray Postgres package automatically records query information and request and response data. Simply patch the Postgres package via capturePostgres as shown below.

The AWS X-Ray SDK Core has two modes - manual and automatic. Automatic mode uses the cls-hooked package and automatically tracks the current segment and subsegment. This is the default mode. Manual mode requires that you pass around the segment reference. See the examples below.

Environment variables

POSTGRES_DATABASE_VERSION        Sets additional data for the sql subsegment.
POSTGRES_DRIVER_VERSION          Sets additional data for the sql subsegment.

Lambda Example

var AWSXRay = require('aws-xray-sdk');
var pg = AWSXRay.capturePostgres(require('pg'));

...

exports.handler = function (event, context, callback) {
  // Make postgres queries normally
}

Automatic mode example

var AWSXRay = require('aws-xray-sdk-core');
var capturePostgres = require('aws-xray-sdk-postgres');

var pg = capturePostgres(require('pg'));

...

var client = new pg.Client();

client.connect(function (err) {
  ...

  client.query({name: 'moop', text: 'SELECT $1::text as name'}, ['brianc'], function (err, result) {
    //Automatically captures query information and errors (if any)
  });
});

...

var pool = new pg.Pool(config);
pool.connect(function(err, client, done) {
  if(err) {
    return console.error('error fetching client from pool', err);
  }
  var query = client.query('SELECT * FROM mytable', function(err, result) {
    //Automatically captures query information and errors (if any)
  });
});

Manual mode example

var AWSXRay = require('aws-xray-sdk-core');
var capturePostgres = require('aws-xray-sdk-postgres');

var pg = capturePostgres(require('pg'));

...

var client = new pg.Client();

client.connect(function (err) {
  ...

  client.query({name: 'moop', text: 'SELECT $1::text as name'}, ['mcmuls'], function (err, result) {
    //Automatically captures query information and errors (if any)
  });
});

...

var pool = new pg.Pool(config);
pool.connect(function(err, client, done) {
  if(err) {
    return console.error('error fetching client from pool', err);
  }
  var query = client.query('SELECT * FROM mytable', function(err, result) {
    //Automatically captures query information and errors (if any)
  }, segment));
};