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connection.go
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connection.go
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package solr
import (
"bytes"
"context"
"encoding/json"
"io"
"log"
"net/http"
"net/url"
"time"
"github.com/hashicorp/go-retryablehttp"
)
type connection interface {
request(ctx context.Context, method, path string, body []byte) (*Response, error)
formatBasePath() string
setBasicAuth(username, password string)
}
// Connection represents the connection to the solr server and
// includes information about the address of the server and
// and the client to be used for connecting to it.
type Connection struct {
httpClient *http.Client
Host string
Core string
Username string
Password string
}
// NewConnection ...
func NewConnection(host, core string, client *http.Client) (*Connection, error) {
if host == "" || core == "" {
return nil, ErrInvalidConfig
}
_, err := url.ParseRequestURI(host)
if err != nil {
return nil, err
}
return &Connection{
Host: host,
Core: core,
httpClient: client,
}, nil
}
func (c *Connection) formatBasePath() string {
return formatBasePath(c.Host, c.Core)
}
func (c *Connection) setBasicAuth(username, password string) {
c.Username = username
c.Password = password
}
func (c *Connection) request(ctx context.Context, method, url string, body []byte) (*Response, error) {
req, err := http.NewRequest(method, url, bytes.NewBuffer(body))
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/json")
if c.Username != "" && c.Password != "" {
req.SetBasicAuth(c.Username, c.Password)
}
res, err := c.httpClient.Do(req.WithContext(ctx))
if err != nil {
return nil, err
}
var r Response
defer res.Body.Close()
err = json.NewDecoder(res.Body).Decode(&r)
if err != nil {
return nil, err
}
if r.Error != nil {
return &r, r.Error
}
return &r, nil
}
// RetryableConnection implements the retryablehttp library from Hashicorp that allows
// making a http request multiple times with a set time in case of failure due to
// connectivity issues. This for example can be useful if your solr servers are
// being shutdown while a new one gets started, the request can continue
// trying allowing for the server to be replaced without dropping it.
type RetryableConnection struct {
Host string
Core string
Username string
Password string
Timeout time.Duration
httpClient *http.Client
retryClient *retryablehttp.Client
}
type RetryableConfig struct {
Timeout time.Duration
RetryWaitMin time.Duration
RetryWaitMax time.Duration
RetryMax int
NoLog bool
}
// NewRetryableConnection ...
func NewRetryableConnection(host, core string, client *http.Client, conf *RetryableConfig) (*RetryableConnection, error) {
if host == "" || core == "" {
return nil, ErrInvalidConfig
}
_, err := url.ParseRequestURI(host)
if err != nil {
return nil, err
}
if conf == nil {
conf = &RetryableConfig{
Timeout: 10 * time.Second,
RetryWaitMin: 50 * time.Millisecond,
RetryWaitMax: 2 * time.Second,
RetryMax: 4,
NoLog: true,
}
}
retryClient := retryablehttp.NewClient()
retryClient.HTTPClient = client
retryClient.HTTPClient.Timeout = conf.Timeout
retryClient.RetryWaitMin = conf.RetryWaitMin
retryClient.RetryWaitMax = conf.RetryWaitMax
retryClient.RetryMax = conf.RetryMax
if conf.NoLog {
retryClient.Logger = log.New(io.Discard, "", log.LstdFlags)
}
return &RetryableConnection{
Host: host,
Core: core,
Timeout: conf.Timeout,
httpClient: client,
retryClient: retryClient,
}, nil
}
func (c *RetryableConnection) formatBasePath() string {
return formatBasePath(c.Host, c.Core)
}
func (c *RetryableConnection) setBasicAuth(username, password string) {
c.Username = username
c.Password = password
}
func (c *RetryableConnection) request(ctx context.Context, method, path string, body []byte) (*Response, error) {
req, err := retryablehttp.NewRequest(method, path, bytes.NewBuffer(body))
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/json")
if c.Username != "" && c.Password != "" {
req.SetBasicAuth(c.Username, c.Password)
}
res, err := c.retryClient.Do(req.WithContext(ctx))
if err != nil {
return nil, err
}
var r Response
defer res.Body.Close()
err = json.NewDecoder(res.Body).Decode(&r)
if err != nil {
return nil, err
}
if r.Error != nil {
return &r, r.Error
}
return &r, nil
}