Read Metrics

To read existing metrics, you will need to make a TLS request to the OpenHIM API for the below method and endpoint. The two query parameters startDate and endDate have to be supplied (datetime format).

Read all metrics

Method: GET

Endpoint: {openhim_url}:8080/metrics?startDate=<START_DATE>&endDate=<END_DATE>

Read metrics broken down by channel

Method: GET

Endpoint: {openhim_url}:8080/metrics/channels?startDate=<START_DATE>&endDate=<END_DATE>

Read metrics for a specific channel

Method: GET

Endpoint: {openhim_url}:8080/metrics/channels/:channelId?startDate=<START_DATE>&endDate=<END_DATE>

Read metrics in a specified timeSeries

Method: GET

Endpoint: {openhim_url}:8080/metrics/timeseries/:timeSeries?startDate=<START_DATE>&endDate=<END_DATE>

Time series values are one of 'minute', 'hour', 'day', 'month', 'year'.

Read metrics broken down by channel in a specified timeSeries

Method: GET

Endpoint: {openhim_url}:8080/metrics/timeseries/:timeSeries/channels?startDate=<START_DATE>&endDate=<END_DATE>

Read metrics for a specific channel in a specified timeSeries

Method: GET

Endpoint: {openhim_url}:8080/metrics/timeseries/:timeSeries/channels/:channelId?startDate=<START_DATE>&endDate=<END_DATE>

The metrics API always returns a JSON array with the metrics. If the channel does not exist the api responds with a status of 401, and 200 on success.

Example

Before we can send our request to the OpenHIM API we need to ensure that we construct our valid HTTP headers to successfully authenticate with the OpenHIM API.

NodeJS

Copy the below code at the bottom of your nodejs script that handles the authentication of the OpenHIM headers as described in the authentication section.

Replace the openhimOptions values with the correct implementation details

// append below code to the "openhim-api.js" script containing the authentication methods.

// This is described within the authentication section

(async () => {

const openhimOptions = {

apiURL: 'https://localhost:8080',

apiEndpoint: '/metrics',

username: '[email protected]',

password: 'openhim-password',

rejectUnauthorized: false

}

const headers = await genAuthHeaders(openhimOptions)

const options = { method: 'GET',

url: `${openhimOptions.apiURL}${openhimOptions.apiEndpoint}`,

rejectUnauthorized: openhimOptions.rejectUnauthorized,

headers: headers,

qs: {

startDate: new Date(Date.now() - 3.154e+10), // 3.154e+10 is the number of milliseconds in a year

endDate: new Date()

}

}

request(options, (error, response, body) => {

if (error) throw new Error(error)

console.log({

statusCode: response.statusCode,

body

})

})

})()

Bash

Ensure that you have created your bash script to construct the HTTP authentication headers and send the request to the OpenHIM API as described in the authentication section.

Execute the below command in your terminal where the file is located with the required arguments. Replace the placeholder arguments with the correct implementation details. Make sure to pass valid dates for the startDate and endDate.

./openhim-api.sh [email protected] password -v "https://localhost:8080/metrics?startDate

=<START_DATE>&endDate=<END_DATE>"

The response status code will be 200 if successful.