Open-falcon-hbs Learning

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Open-falcon-hbs

tags (space delimited): Go Falcon

Key Features

• Handling agent heartbeat requests, populating the host table

• IP whitelist issued by all agents

• Issued to implement the plug-in information

• Issued monitoring port, process

• Cache monitoring Policy

Module structure

Memory Data Map Structure

• Hostmap:
  (hostname, hostId int)

• Hostgroupsmap:
  (hostId, groupsId []int)

• Groupplugins:
  (groupId, pluginsPath []string)

• Grouptemplates:
  (groupId, templatesID []int)

• Templatecache:
  (templateId, Template)

type Template struct {    Id       int    `json:"id"`    Name     string `json:"name"`    ParentId int    `json:"parentId"`    ActionId int    `json:"actionId"`    Creator  string `json:"creator"`}

• Strategies:
  (strategryID, Strategry)

type Strategy struct {    Id         int               `json:"id"`    Metric     string            `json:"metric"`    Tags       map[string]string `json:"tags"`    Func       string            `json:"func"`       // e.g. max(#3) all(#3)    Operator   string            `json:"operator"`   // e.g. < !=    RightValue float64           `json:"rightValue"` // critical value    MaxStep    int               `json:"maxStep"`    Priority   int               `json:"priority"`    Note       string            `json:"note"`    Tpl        *Template         `json:"tpl"`}

• Hosttemplates:
  (hostID, templatesID []int)

• Expressioncache:
  (expressionId, [] Expression)

type Expression struct {    Id         int               `json:"id"`    Metric     string            `json:"metric"`    Tags       map[string]string `json:"tags"`    Func       string            `json:"func"`       // e.g. max(#3) all(#3)    Operator   string            `json:"operator"`   // e.g. < !=    RightValue float64           `json:"rightValue"` // critical value    MaxStep    int               `json:"maxStep"`    Priority   int               `json:"priority"`    Note       string            `json:"note"`    ActionId   int               `json:"actionId"`}

• Monitoredhosts:
  (hostID, Host)

type Host struct {    Id   int    Name string}

DB and Cache

• Database operations

rows, err = DB.Query(sql)if err != nil {    log.Println("ERROR:", err)    return err}…defer DB.Close()for rows.Next(){    …    err = rows.Scan(&id, &hostname)    if err != nil {        log.Println("ERROR:", err)        continue    }    …}

• Caching policies
  The initial runtime reads data from PORTALDB in memory, and then executes the PORTALDB query every minute (consistent with the initial run operation) to update the data into memory.

• Plug-in Policies

1. Plugins update request contains hostname and checksum (checksum initially empty), HBS reads the plug-in path information from the PORTALDB after receiving the request, and after sorting the path takes MD5 to form checksum, Checksum compared to the agent request, the same return null does not make the plugins update, otherwise return the plug-in information, Agent received after the update plug-in and regular execution of plug-ins.

How RPC is implemented

RPC services can be established through HTTP,TCP and JSON Sever and CLIENT;HBS RPC service side through the implementation of JSON, can register multiple clients, implement the relevant interface for agent and Judge Call.