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consul_agent_checks.go
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/
consul_agent_checks.go
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package discovery
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
)
const (
agentChecksPath = "/v1/agent/checks" // Returns the checks the local agent is managing
agentCheckRegisterPath = "/v1/agent/check/register" // Registers a new local check
agentCheckDeregisterPath = "/v1/agent/check/deregister" // Deregisters a local check
)
// Check struct
type Check struct {
ID string `json:"ID,omitempty"`
CheckID string `json:"CheckID,omitempty"`
Name string `json:"Name"`
Node string `json:"Node,omitempty"`
Notes string `json:"Notes,omitempty"`
DeregisterCriticalServiceAfter string `json:"DeregisterCriticalServiceAfter,omitempty"`
Script string `json:"Script,omitempty"`
DockerContainerID string `json:"DockerContainerID,omitempty"`
Shell string `json:"Shell,omitempty"`
HTTP string `json:"HTTP,omitempty"`
TCP string `json:"TCP,omitempty"`
Interval string `json:"Interval,omitempty"`
TTL string `json:"TTL,omitempty"`
Timeout string `json:"Timeout,omitempty"`
ServiceID string `json:"ServiceID,omitempty"`
Status string `json:"Status,omitempty"`
}
// Checks map of checks
type Checks map[string]Check
// Checker interface
type Checker interface {
GetChecks(addr, path string) (Checks, error)
}
// DefaultChecker struct to implement Checker default methods
type DefaultChecker struct{}
// GetChecks make GET request on consul api
func (ds *DefaultChecker) GetChecks(addr, path string) (Checks, error) {
url := fmt.Sprintf("http://%s%s", addr, path)
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
checks := Checks{}
if err := json.Unmarshal(body, &checks); err != nil {
return nil, err
}
return checks, nil
}
// GetChecks function to get a map of checks
func GetChecks(c Checker, addr string) (Checks, error) {
checks, err := c.GetChecks(addr, agentChecksPath)
if err != nil {
return nil, fmt.Errorf("Error querying Consul API: %s", err)
}
return checks, nil
}
// CheckRegister interface
type CheckRegister interface {
Register(addr, path string, c *Check) error
Unregister(addr, path, checkID string) error
}
// DefaultCheckRegister struct to implement CheckRegister default methods
type DefaultCheckRegister struct{}
// Register make PUT request on consul api
func (dr *DefaultCheckRegister) Register(addr, path string, c *Check) error {
return register(addr, path, c)
}
// Unregister make PUT request on consul api
func (dr *DefaultCheckRegister) Unregister(addr, path, checkID string) error {
return unregister(addr, path, checkID)
}
// DoCheckRegister function to register a new check
func DoCheckRegister(cr CheckRegister, addr string, c *Check) error {
err := cr.Register(addr, agentCheckRegisterPath, c)
if err != nil {
return fmt.Errorf("Error registering check Consul API: %s", err)
}
return nil
}
// DoCheckUnregister function to unregister a check by ID
func DoCheckUnregister(cr CheckRegister, addr, checkID string) error {
err := cr.Unregister(addr, agentCheckDeregisterPath, checkID)
if err != nil {
return fmt.Errorf("Error unregistering check Consul API: %s", err)
}
return nil
}