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client.go
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client.go
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package configmanager
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"os"
"strings"
)
// The centralconfig client
type ConfigClient struct {
ServiceUrl string // The service url
Application string // The application to fetch config information for
Machine string // The (optional) machine to fetch config information for.
}
// Get a specific config item
func (client ConfigClient) Get(name string) (ConfigResponse, error) {
retval := ConfigResponse{}
// First, see if we have a service url set:
if client.ServiceUrl == "" {
err := fmt.Errorf("Please specify a 'ServiceUrl' for the centralconfig service")
return retval, err
}
apiUrl := client.ServiceUrl + "/config/get"
// Check to see if we have an application
if client.Application == "" {
err := fmt.Errorf("Please specify an 'Application' to get configuration for")
return retval, err
}
// Get the machine name if it hasn't been set
if client.Machine == "" {
hostname, err := os.Hostname()
if err == nil {
client.Machine = hostname
}
}
// Create our request
request := ConfigItem{
Application: client.Application,
Name: name}
// Serialize our request to JSON:
requestBytes := new(bytes.Buffer)
err := json.NewEncoder(requestBytes).Encode(&request)
if err != nil {
return retval, err
}
// Convert bytes to a reader.
requestJSON := strings.NewReader(requestBytes.String())
// Post the JSON to the api url
res, err := http.Post(apiUrl, "application/json", requestJSON)
if res != nil {
defer res.Body.Close()
}
if err != nil {
return retval, err
}
// Decode the return object
err = json.NewDecoder(res.Body).Decode(&retval)
if err != nil {
return retval, err
}
return retval, nil
}
// Get a specific config item
func (client ConfigClient) GetAllForApplication() (ConfigResponseMultiple, error) {
retval := ConfigResponseMultiple{}
// First, see if we have a service url set:
if client.ServiceUrl == "" {
err := fmt.Errorf("Please specify a 'ServiceUrl' for the centralconfig service")
return retval, err
}
apiUrl := client.ServiceUrl + "/config/getallforapp"
// Check to see if we have an application
if client.Application == "" {
err := fmt.Errorf("Please specify an 'Application' to get configuration for")
return retval, err
}
// Create our request
request := ConfigItem{
Application: client.Application}
// Serialize our request to JSON:
requestBytes := new(bytes.Buffer)
err := json.NewEncoder(requestBytes).Encode(&request)
if err != nil {
return retval, err
}
// Convert bytes to a reader.
requestJSON := strings.NewReader(requestBytes.String())
// Post the JSON to the api url
res, err := http.Post(apiUrl, "application/json", requestJSON)
if res != nil {
defer res.Body.Close()
}
if err != nil {
return retval, err
}
// Decode the return object
err = json.NewDecoder(res.Body).Decode(&retval)
if err != nil {
return retval, err
}
return retval, nil
}
// Get a specific config item
func (client ConfigClient) GetAll() (ConfigResponseMultiple, error) {
retval := ConfigResponseMultiple{}
// First, see if we have a service url set:
if client.ServiceUrl == "" {
err := fmt.Errorf("Please specify a 'ServiceUrl' for the centralconfig service")
return retval, err
}
apiUrl := client.ServiceUrl + "/config/getall"
// Convert bytes to a reader.
requestJSON := strings.NewReader("")
// Post the JSON to the api url
res, err := http.Post(apiUrl, "application/json", requestJSON)
if res != nil {
defer res.Body.Close()
}
if err != nil {
return retval, err
}
// Decode the return object
err = json.NewDecoder(res.Body).Decode(&retval)
if err != nil {
return retval, err
}
return retval, nil
}
// Set creates or updates a config item
func (client ConfigClient) Set(request *ConfigItem) (ConfigResponse, error) {
retval := ConfigResponse{}
// First, see if we have a service url set:
if client.ServiceUrl == "" {
err := fmt.Errorf("Please specify a 'ServiceUrl' for the centralconfig service")
return retval, err
}
apiUrl := client.ServiceUrl + "/config/set"
// Check to see if we have an application
if request.Application == "" {
err := fmt.Errorf("Please specify an 'Application' to set configuration for")
return retval, err
}
// Serialize our request to JSON:
requestBytes := new(bytes.Buffer)
err := json.NewEncoder(requestBytes).Encode(request)
if err != nil {
return retval, err
}
// Convert bytes to a reader.
requestJSON := strings.NewReader(requestBytes.String())
// Post the JSON to the api url
res, err := http.Post(apiUrl, "application/json", requestJSON)
if res != nil {
defer res.Body.Close()
}
if err != nil {
return retval, err
}
// Decode the return object
err = json.NewDecoder(res.Body).Decode(&retval)
if err != nil {
return retval, err
}
return retval, nil
}
// Remove removes a config item
func (client ConfigClient) Remove(request *ConfigItem) error {
retval := ConfigResponse{}
// First, see if we have a service url set:
if client.ServiceUrl == "" {
err := fmt.Errorf("Please specify a 'ServiceUrl' for the centralconfig service")
return err
}
apiUrl := client.ServiceUrl + "/config/remove"
// Check to see if we have an application
if request.Application == "" {
err := fmt.Errorf("Please specify an 'Application' to remove configuration for")
return err
}
// Check to see if we have a name
if request.Name == "" {
err := fmt.Errorf("Please specify a 'Name' to remove configuration for")
return err
}
// Serialize our request to JSON:
requestBytes := new(bytes.Buffer)
err := json.NewEncoder(requestBytes).Encode(request)
if err != nil {
return err
}
// Convert bytes to a reader.
requestJSON := strings.NewReader(requestBytes.String())
// Post the JSON to the api url
res, err := http.Post(apiUrl, "application/json", requestJSON)
if res != nil {
defer res.Body.Close()
}
if err != nil {
return err
}
// Decode the return object
err = json.NewDecoder(res.Body).Decode(&retval)
if err != nil {
return err
}
return nil
}