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# IoTDB-Grafana-Connector
<!-- TOC -->
## Outline

- IoTDB-Grafana-Connector
    - Grafana installation
        - Install Grafana
        - Install data source plugin
        - Start Grafana
    - IoTDB installation
    - IoTDB-Grafana-Connector installation
        - Start IoTDB-Grafana-Connector
    - Explore in Grafana
        - Add data source
        - Design in dashboard

<!-- /TOC -->
# IoTDB-Grafana-Connector

This project provides a connector which reads data from IoTDB and sends to Grafana(https://grafana.com/). Before you use this tool, make sure Grafana and IoTDB are correctly installed and started.

## Grafana installation

### Install Grafana

* Download url: https://grafana.com/grafana/download
* version >= 4.4.1

### Install data source plugin

* plugin name: simple-json-datasource
* Download url: https://github.com/grafana/simple-json-datasource

After downloading this plugin, you can use the grafana-cli tool to install SimpleJson from the commandline:

```
grafana-cli plugins install grafana-simple-json-datasource
```

Alternatively, you can manually download the .zip file and unpack it into your grafana plugins directory.

* `{grafana-install-directory}\data\plugins\` (Windows)
* `/var/lib/grafana/plugins` (Linux)
* `/usr/local/var/lib/grafana/plugins`(Mac)

Then you need to restart grafana server, then you can use browser to visit grafana.

If you see "SimpleJson" in "Type" of "Add data source" pages, then it is install successfully.

Or, if you meet following errors:

```
Unsigned plugins were found during plugin initialization. Grafana Labs cannot guarantee the integrity of these plugins. We recommend only using signed plugins.
The following plugins are disabled and not shown in the list below:
```

Please try to find config file of grafana(eg. customer.ini in windows, and /etc/grafana/grafana.ini in linux), then add following configuration:

```
allow_loading_unsigned_plugins = "grafana-simple-json-datasource"
```

### Start Grafana
If you use Unix, Grafana will auto start after installing, or you can run `sudo service grafana-server start` command. See more information [here](http://docs.grafana.org/installation/debian/).

If you use Mac and `homebrew` to install Grafana, you can use `homebrew` to start Grafana.
First make sure homebrew/services is installed by running `brew tap homebrew/services`, then start Grafana using: `brew services start grafana`.
See more information [here](http://docs.grafana.org/installation/mac/).

If you use Windows, start Grafana by executing grafana-server.exe, located in the bin directory, preferably from the command line. See more information [here](http://docs.grafana.org/installation/windows/).

## IoTDB installation

See https://github.com/apache/iotdb

## IoTDB-Grafana-Connector installation

```shell
git clone https://github.com/apache/iotdb.git
```

### Start IoTDB-Grafana-Connector

#### Option one

Import the entire project, after the maven dependency is installed, directly run`iotdb/grafana/rc/main/java/org/apache/iotdb/web/grafana`directory` TsfileWebDemoApplication.java`, this grafana connector is developed by springboot

#### Option two

In `/grafana/target/`directory 

```shell
cd iotdb
mvn clean package -pl grafana -am -Dmaven.test.skip=true
cd grafana/target
java -jar iotdb-grafana-connector-{version}.war
```

If you see the following output, iotdb-grafana-connector connector is successfully activated.

```shell
$ java -jar iotdb-grafana-connector-{version}.war

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.4.RELEASE)
...
```

If you need to configure properties, move the ` grafana/src/main/resources/application.properties` to the same directory as the war package (`grafana/target`)

## Explore in Grafana

The default port of Grafana is 3000, see http://localhost:3000

Username and password are both "admin" by default.

### Add data source

Select `Data Sources` and  then `Add data source`, select `SimpleJson` in `Type` and `URL` is http://localhost:8888
<img style="width:100%; max-width:800px; max-height:600px; margin-left:auto; margin-right:auto; display:block;" src="https://user-images.githubusercontent.com/13203019/51664777-2766ae00-1ff5-11e9-9d2f-7489f8ccbfc2.png">

<img style="width:100%; max-width:800px; max-height:600px; margin-left:auto; margin-right:auto; display:block;" src="https://user-images.githubusercontent.com/13203019/51664842-554bf280-1ff5-11e9-97d2-54eebe0b2ca1.png">

### Design in dashboard

Add diagrams in dashboard and customize your query. See http://docs.grafana.org/guides/getting_started/

<img style="width:100%; max-width:800px; max-height:600px; margin-left:auto; margin-right:auto; display:block;" src="https://user-images.githubusercontent.com/13203019/51664878-6e54a380-1ff5-11e9-9718-4d0e24627fa8.png">

## config grafana

```
# ip and port of IoTDB 
spring.datasource.url=jdbc:iotdb://127.0.0.1:6667/
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=org.apache.iotdb.jdbc.IoTDBDriver
server.port=8888
# Use this value to set timestamp precision as "ms", "us" or "ns", which must to be same with the timestamp
# precision of Apache IoTDB engine.
timestamp_precision=ms

# Use this value to set down sampling true/false
isDownSampling=true
# defaut sampling intervals
interval=1m
# aggregation function to use to downsampling the data
# COUNT, FIRST_VALUE, LAST_VALUE, MAX_TIME, MAX_VALUE, AVG, MIN_TIME, MIN_VALUE, NOW, SUM
function=avg
```

The specific configuration information of interval is as follows

<1h: no sampling

1h~1d : intervals = 1m

1d~30d:intervals = 1h

\>30d：intervals = 1d

After configuration, please re-run war package

```
java -jar iotdb-grafana-connector-{version}.war
```

