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basehttpcomponent.go
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/
basehttpcomponent.go
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package gocbcorex
import (
"context"
"errors"
"math/rand"
"net/http"
"sync"
"time"
"github.com/couchbase/gocbcorex/cbmgmtx"
"github.com/couchbase/gocbcorex/cbqueryx"
"github.com/couchbase/gocbcorex/cbsearchx"
"golang.org/x/exp/slices"
)
type baseHttpComponent struct {
serviceType ServiceType
userAgent string
lock sync.RWMutex
state *baseHttpComponentState
}
type baseHttpComponentState struct {
httpRoundTripper http.RoundTripper
endpoints map[string]string
authenticator Authenticator
}
type baseHttpTarget struct {
EndpointId string
Endpoint string
Username string
Password string
}
func (c *baseHttpComponent) updateState(newState baseHttpComponentState) {
c.lock.Lock()
c.state = &newState
c.lock.Unlock()
}
func (c *baseHttpComponent) GetAllTargets(endpointIdsToIgnore []string) (http.RoundTripper, []baseHttpTarget, error) {
c.lock.RLock()
state := *c.state
c.lock.RUnlock()
// remove all the endpoints we've already tried
remainingEndpoints := make(map[string]string, len(state.endpoints))
for epId, endpoint := range state.endpoints {
if !slices.Contains(endpointIdsToIgnore, epId) {
remainingEndpoints[epId] = endpoint
}
}
targets := make([]baseHttpTarget, 0, len(remainingEndpoints))
for epId, endpoint := range remainingEndpoints {
host, err := getHostFromUri(endpoint)
if err != nil {
return nil, []baseHttpTarget{}, err
}
username, password, err := state.authenticator.GetCredentials(c.serviceType, host)
if err != nil {
return nil, []baseHttpTarget{}, err
}
targets = append(targets, baseHttpTarget{
EndpointId: epId,
Endpoint: endpoint,
Username: username,
Password: password,
})
}
return state.httpRoundTripper, targets, nil
}
func (c *baseHttpComponent) SelectSpecificEndpoint(endpointId string) (http.RoundTripper, string, string, string, error) {
c.lock.RLock()
state := *c.state
c.lock.RUnlock()
foundEndpoint := ""
for epId, endpoint := range state.endpoints {
if epId == endpointId {
foundEndpoint = endpoint
break
}
}
if foundEndpoint == "" {
return nil, "", "", "", errors.New("invalid endpoint")
}
host, err := getHostFromUri(foundEndpoint)
if err != nil {
return nil, "", "", "", err
}
username, password, err := state.authenticator.GetCredentials(c.serviceType, host)
if err != nil {
return nil, "", "", "", err
}
return state.httpRoundTripper, foundEndpoint, username, password, nil
}
func (c *baseHttpComponent) SelectEndpoint(endpointIdsToIgnore []string) (http.RoundTripper, string, string, string, string, error) {
c.lock.RLock()
state := *c.state
c.lock.RUnlock()
// if there are no endpoints to query, we can't proceed
if len(state.endpoints) == 0 {
return nil, "", "", "", "", nil
}
// remove all the endpoints we've already tried
remainingEndpoints := make(map[string]string, len(state.endpoints))
endpointIds := make([]string, 0, len(state.endpoints))
for epId, endpoint := range state.endpoints {
if !slices.Contains(endpointIdsToIgnore, epId) {
remainingEndpoints[epId] = endpoint
endpointIds = append(endpointIds, epId)
}
}
// if there are no more endpoints to try, we can't proceed
if len(remainingEndpoints) == 0 {
return nil, "", "", "", "", nil
}
// pick a random endpoint to attempt
endpointIdx := rand.Intn(len(remainingEndpoints))
endpointId := endpointIds[endpointIdx]
endpoint := remainingEndpoints[endpointId]
host, err := getHostFromUri(endpoint)
if err != nil {
return nil, "", "", "", "", err
}
username, password, err := state.authenticator.GetCredentials(c.serviceType, host)
if err != nil {
return nil, "", "", "", "", err
}
return state.httpRoundTripper, endpointId, endpoint, username, password, nil
}
type baseHttpTargets []baseHttpTarget
func (nt baseHttpTargets) ToMgmtx() []cbmgmtx.NodeTarget {
targets := make([]cbmgmtx.NodeTarget, len(nt))
for i, target := range nt {
targets[i] = cbmgmtx.NodeTarget{
Endpoint: target.Endpoint,
Username: target.Username,
Password: target.Password,
}
}
return targets
}
func (nt baseHttpTargets) ToQueryx() []cbqueryx.NodeTarget {
targets := make([]cbqueryx.NodeTarget, len(nt))
for i, target := range nt {
targets[i] = cbqueryx.NodeTarget{
Endpoint: target.Endpoint,
Username: target.Username,
Password: target.Password,
}
}
return targets
}
func (nt baseHttpTargets) ToSearchx() []cbsearchx.NodeTarget {
targets := make([]cbsearchx.NodeTarget, len(nt))
for i, target := range nt {
targets[i] = cbsearchx.NodeTarget{
Endpoint: target.Endpoint,
Username: target.Username,
Password: target.Password,
}
}
return targets
}
func (c *baseHttpComponent) ensureResource(ctx context.Context, backoff BackoffCalculator,
pollFn func(context.Context, http.RoundTripper, baseHttpTargets) (bool, error)) error {
for attemptIdx := 0; ; attemptIdx++ {
roundTripper, targets, err := c.GetAllTargets(nil)
if err != nil {
return err
}
success, err := pollFn(ctx, roundTripper, targets)
if err != nil {
return err
}
if success {
break
}
select {
case <-time.After(backoff(uint32(attemptIdx))):
case <-ctx.Done():
return ctx.Err()
}
}
return nil
}