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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2026-01-12T09:29:33.506Z","updated_at":"2026-01-12T09:29:35.669Z","avatar_url":"https://github.com/fathzer.png","language":"Java","funding_links":[],"categories":[],"sub_categories":[],"readme":"# sites-supervisor-core\n\nThe core functionalities of an [uptimeRobot](https://uptimerobot.com/) like application supervisor.  \nIt allows you to test a bunch of applications, be informed of the failures and store the history of test results in order to easily create dashboards. \n\n## Table of contents\n1. [Requirements and installation](#requirements-and-installation)\n1. [Main concepts](#main-concepts)\n1. [Configuration](#configuration)\n   1. [Global configuration](#global-configuration)\n   1. [Supervised applications configuration](#supervised-applications-configuration)\n1. [Components documentation](#components-documentation)\n   1. [com.fathzer.sitessupervisor.db.Influx](#comfathzersitessupervisordbinflux)\n   1. [com.fathzer.sitessupervisor.alerter.LogAlerter](#comfathzersitessupervisoralerterlogalerter)\n   1. [com.fathzer.sitessupervisor.alerter.EMailAlerter](#comfathzersitessupervisoralerteremailalerter)\n   1. [com.fathzer.sitessupervisor.alerter.TeamsAlerter](#comfathzersitessupervisoralerterteamsalerter)\n   1. [com.fathzer.sitessupervisor.tester.BasicHttpTester](#comfathzersitessupervisortesterbasichttptester)\n   1. [com.fathzer.sites.supervisor.SupervisorCommand](#comfathzersitessupervisorsupervisorcommand)\n1. [Writing your own database connectors, testers and alerters](#writing-your-own-database-connectors-testers-and-alerters)\n1. [Logging](#logging)\n\n## Requirements and installation\nThis library requires Java 8+.\n\nIt is released as a Maven artifact. Add this to your pom.  \n```xml\n\u003cdependency\u003e\n\t\u003cgroupId\u003ecom.fathzer\u003c/groupId\u003e\n\t\u003cartifactId\u003esites-supervisor-core\u003c/artifactId\u003e\n\t\u003cversion\u003e0.0.7\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n## Main concepts\nBasically, an application supervisor is composed of 4 kinds of components:\n* **Testers** send requests to sites and test whether the reply is ok or ko.\n* Optionally, **Alerters** send alerts to site's administrator when the site's status changes from ok to ko, or ko to ok.\n* Optionally, a **Database** stores the tests results and allows a visualization application to query the sites status history.\n* A **SuperVisor** that manages the other components. It schedules the tests, stores the results in a database and triggers alerters.\n\nThis library includes the following implementation of these concepts:\n* **Testers**:\n  * **[com.fathzer.sitessupervisor.tester.BasicHttpTester](#comfathzersitessupervisortesterbasichttptester)**: An http tester that queries an URI and tests the status code is 200. It supports adding headers (for example to provide an api key), and proxy.\n* **Alerters**:\n  * **[com.fathzer.sitessupervisor.alerter.EMailAlerter](#comfathzersitessupervisoralerteremailalerter)**: An email alerter that connects to a smtp server to send mails.\n  * **[com.fathzer.sitessupervisor.alerter.TeamsAlerter](#comfathzersitessupervisoralerterteamsalerter)**: An Alerter that sends messages in a Microsoft teams Team channel.\n* **Database**:\n  * **[com.fathzer.sitessupervisor.db.Influx](#comfathzersitessupervisordbinflux)**: A connector to [InfluxDB](https://www.influxdata.com/).\n* **Supervisor**:\n  * **com.fathzer.sitessupervisor.Supervisor**: A supervisor that manages the full life cycle of the supervision.\n  \nThis package also provides **com.fathzer.sitessupervisor.parsing.JSONParser** that allows you to parse configuration files in JSON format, and **com.fathzer.sitessupervisor.SupervisorCommand**, a runnable class that parses JSON configuration files, then instantiates and runs a Supervisor.\n\n## Configuration\nThe configuration of a supervisor is divided in two parts:\n* A static one, defined at supervisor creation, that contains database, testers and alerters global configuration.\n* A dynamic one, that can be changed during Supervisor life time, that contains informations related to the supervised applications. This allows you to add/modify/remove application from supervision without restarting it.\n\n### Global configuration\nHere is a configuration example:\n```json\n{\n\t\"database\":{\n\t\t\"class\":\"com.fathzer.sitessupervisor.db.Influx\"\n\t},\n\t\"alerters\":{\n\t\t\"mail\" : {\n\t\t\t\"class\":\"com.fathzer.sitessupervisor.alerter.EMailAlerter\",\n\t\t\t\"parameters\":{\n\t\t\t\t\"host\":\"smtp.gmail.com\",\n\t\t\t\t\"secured\":true,\n\t\t\t\t\"user\":\"adm.example.com@gmail.com\",\n\t\t\t\t\"password\":\"pwd\",\n\t\t\t\t\"from\":\"noreply-supervisor@example.com\"\n\t\t\t}\n\t\t}\n\t},\n\t\"testers\": {\n\t\t\"http200\" :\t{\n\t\t\t\"class\":\"com.fathzer.sitessupervisor.tester.BasicHttpTester\",\n\t\t\t\"parameters\":{\n\t\t\t\t\"proxy\":\"myproxy.example.com:3128\",\n\t\t\t\t\"noProxy\":\".example.com\"\n\t\t\t}\n\t\t}\n\t}\n}\n```\n\nThe important things to understand are:\n* All the components are identified by their class name.\n* All the components have a *parameters* attribute that contains the configuration of the component. The exact content of this attribute (and its obligatory presence) depends on the component (see component's documentation).\n* alerters and testers have unique names (here *mail* and *http200*) that will be used to identified them in supervised applications configuration file.\n\n### Supervised applications configuration\nHere is a configuration example:\n```json\n{\n\t\"services\":[\n\t\t{\n\t\t\t\"uri\":\"https://myapp.example.com/ping\",\n\t\t\t\"app\":\"my-app\",\n\t\t\t\"env\":\"prod\",\n\t\t\t\"frequencyMinutes\":10,\n\t\t\t\"timeOutSeconds\":60,\n\t\t\t\"tester\": {\n\t\t\t\t\"name\":\"http200\",\n\t\t\t\t\"parameters\": {\n\t\t\t\t\t\"headers\": {\n\t\t\t\t\t\t\"apikey\":\"My cool api key\"\n\t\t\t\t\t},\n\t\t\t  \t\t\"useProxy\":true\n\t\t\t\t}\n\t\t\t},\n\t\t\t\"alerters\":[\n\t\t\t\t{\n\t\t\t\t\t\"name\":\"mail\",\n\t\t\t\t\t\"parameters\":{\n\t\t\t\t\t\t\"to\": [\"myappadm@example.com\"]\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t]\n\t\t}\n\t]\n}\n```\nThe important things to understand are:\n* Services (application) are identified by their URL. Two services can't share the same URL.\n* **app**, **env**, **frequencyMinutes** and **timeOutSeconds** attributes are optional.\n  * **app** and **env** are tags that identifies the application and its environment (production, acceptance, ...).\n  * frequencyMinutes sets the test frequency. Default value is 5 minutes.\n  * timeOutSeconds is the maximum time allowed to the test to reply. If no reply is obtained in the specified time, service is considered down. Default value is 30s.\n* A service should have a *tester* attribute and can have no *alerters*. Alerters and tester and identified by the name declared in [**global configuration**](#global-configuration).\n* All the components have a *parameters* attribute that contains the configuration of the component for the service. The exact content of this attribute (and its obligatory presence) depends on the component (see component's documentation).\n\n## Components documentation\n### com.fathzer.sitessupervisor.db.Influx\nHere are the parameters (all are optional):\n* **host**: The host name of the database. Default is *127.0.0.1*.\n* **port**: The port of the database. Default is *8086*.\n* **database**: The name of the database. Default is 'sites-supervisor'. Please note that if the database does not exist it will be automatically created with a 30 days retention policy and no replication (replication factor = 1). If you want other settings, you should create the database before.\n* **user**: The user used to access to the database. This user should have the write rights. If no user is specified, default user is used.\n* **password**: The user's password.\n\nThe data is stored in 2 series:\n* **responseTime** that contains one measurement point per test with the following tags and fields:\n  * tags **url**, **app**, **env** that contain the values specified in the application configuration.\n  * field **success** that contains 1 if the test succeeded, 0 if it failed.\n  * field **responseTime** that contains the responseTime (0 if the test fails).\n  * field **message** that contains the failure cause if the test failed.\n* **events** that contains the status changes (up to down and down to up) with the following tags and fields: \n  * tags **url**, **app**, **env** that contain the values specified in the application configuration.\n  * field **up** that contains 1 if the new application status is up, 0 if it is down. \n  * field **message** that contains the failure cause if the new status is down.\n\n### com.fathzer.sitessupervisor.alerter.LogAlerter\nThe most basic alerter ever ;-)  \nIt simply logs the alerts in the program logs using the com.fathzer.sitesuspervisor.alerter.LogAlerter logger.  \nThe service down event is logged with *warn* level, and with *info* level when it become up again.  \nIt accepts no global nor application parameter.\n\n### com.fathzer.sitessupervisor.alerter.EMailAlerter\nAs its name lets suppose, this alerter sends email to addresses to inform of status changes.\nHere are the global parameters:\n* **host**: The host name of a smtp server.\n* **port**: The port of the smtp server. This attribute is optional, default is 25 if secured is not specified or set to false, 587 if secured is true. \n* **secured**: Sets SSL connection to smtp server. This attribute is optional. Default is false unless port is specified and set to 587.\n* **user**: The user of the smtp server (optional).\n* **password**: The user's password on the smtp server (mandatory if *user* is specified).\n* **from**: The email address used to send the mails.\n\nThe [**global configuration**](#global-configuration) shows how to configure this alerter to use GMail smtp server.\n\nThe only attribute of the application configuration parameters is **to** that contains the list of the recipients of emails. \n\n### com.fathzer.sitessupervisor.alerter.TeamsAlerter\nThis alerter posts message in a Microsoft Teams team channel to inform of status changes.\nHere are the global parameters:\n* **proxy**: The address of the proxy to use to access Internet (optional). The format is *host:port* (example *proxy.example.com:3128*).\n* **noProxy**: A list of host name suffixes (optional). For example, if the suffix *.example.com* is in the list, 'mysite.example.com' will be accessed without proxy.\n\nThe attributes of the application configuration parameters are:\n* **hook** that contains the URL of a Teams incoming web hook. Please see [Teams documentations](https://docs.microsoft.com/fr-fr/microsoftteams/platform/webhooks-and-connectors/how-to/connectors-using#setting-up-a-custom-incoming-webhook) to known how to create an incoming web hook for your Team. \n\n### com.fathzer.sitessupervisor.tester.BasicHttpTester\nThis tester sends http request to the specified URL and considers the result is ok if it gets a 200 status code.\nHere are the global parameters:\n* **proxy**: The address of the proxy to use to access Internet (optional). The format is *host:port* (example *proxy.example.com:3128*).\n* **noProxy**: A list of host name suffixes (optional). For example, if the suffix *.example.com* is in the list, 'mysite.example.com' will be accessed without proxy.\n\nHere are the application specific parameters:\n* **headers**: A map of headers to add to the http request. Keys are the headers name, value are the headers value. See [Supervised application configuration](#supervised-applications-configuration) to have an example.\n* **useProxy**: Sets the proxy usage (optional). This settings overrides the global one. This means if the url matches one of the excluded suffixes declared in the global configuration, but this attribute is true, the proxy will be used. Same thing if set to false and url not matches any suffix.\n* **sslCheck**: Sets the ssl verification (optional). Set this to false to deactivate ssl verification on https uri. As it is clearly a security home, this is not recommended, but it can save hours if you want to test URL with untrusted certificate.\n\nPlease note this class can be easily subclassed to change its behavior. The *verify* method can be overridden to accept more parameters and *buildRequest* and *isValid* methods can then have other behavior (let say, use POST instead of GET and accept 201 instead of 200).\n\n\n## com.fathzer.sitessupervisor.SupervisorCommand\nThe supervisor command class allows you to launch a supervisor using the command line.\nSimply launch this class (*java com.fathzer.sitessupervisor.SupervisorCommand*) to display help.\n\nPlease note that once launched, this class listens to the application file configuration changes and reloads it every time it changes.  \nPlease note if the file can't be parsed, changes are ignored. Nevertheless, it's safer to make a backup of the configuration file before modifying it.\n\n## Writing your own database connectors, testers and alerters\nSupervisor uses a plugin architecture. You can define your own components to store the result in another database, alert through SMS, Slack, etc and tests other protocols than http.\n\nTesters should extends the com.fathzer.sitessupervisor.tester.Tester class.  \nAlerters should extends the com.fathzer.sitessupervisor.alerter.Alerter class.  \nDatabase connectors should extends the com.fathzer.sitessupervisor.db.DB class.\n\nNote that the instances of these classes are unique and **should be thread safe**.  \nThey should have a constructor accepting a *Map\u003cString, Object\u003e* argument.\nThe *verify* method of alerters and testers returns an object that should implement an *equals* method that guarantees two objects created with equivalent parameters will be equals (This guarantees that only application changed are impacted when configuration file changes).   \n\nThe best documentation is ... to have a look at the implemented class and their super class ;-)\n\n## Logging\nThis package uses [slf4j facade](http://www.slf4j.org/) for logging. You are free to use the implementation you want, for instance [logback classic](http://logback.qos.ch/). \n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffathzer%2Fsites-supervisor-core","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ffathzer%2Fsites-supervisor-core","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffathzer%2Fsites-supervisor-core/lists"}