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client.go
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client.go
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package scyllaclient
import (
"context"
"crypto/tls"
"net"
"net/http"
"runtime"
"sort"
"sync"
"time"
api "github.com/go-openapi/runtime/client"
apiMiddleware "github.com/go-openapi/runtime/middleware"
"github.com/go-openapi/strfmt"
"github.com/hailocab/go-hostpool"
"github.com/scylladb/go-log"
"github.com/scylladb/go-set/strset"
"github.com/scylladb/scylla-operator/pkg/auth"
scyllaClient "github.com/scylladb/scylla-operator/pkg/scyllaclient/internal/scylla/client"
scyllaOperations "github.com/scylladb/scylla-operator/pkg/scyllaclient/internal/scylla/client/operations"
"github.com/scylladb/scylla-operator/pkg/util/httpx"
)
type Client struct {
config Config
logger log.Logger
scyllaOps *scyllaOperations.Client
transport http.RoundTripper
mu sync.RWMutex
dcCache map[string]string
}
func NewClient(config Config, logger log.Logger) (*Client, error) {
/*if err := config.Validate(); err != nil {
return nil, errors.Wrap(err, "invalid config")
}*/
setOpenAPIGlobals()
hosts := make([]string, len(config.Hosts))
copy(hosts, config.Hosts)
pool := hostpool.NewEpsilonGreedy(hosts, config.PoolDecayDuration, &hostpool.LinearEpsilonValueCalculator{})
if config.Transport == nil {
config.Transport = DefaultTransport()
}
transport := config.Transport
transport = timeout(transport, config.Timeout)
transport = requestLogger(transport, logger)
transport = hostPool(transport, pool, config.Port)
transport = auth.AddToken(transport, config.AuthToken)
transport = fixContentType(transport)
c := &http.Client{Transport: transport}
scyllaRuntime := api.NewWithClient(
scyllaClient.DefaultHost, scyllaClient.DefaultBasePath, []string{config.Scheme}, c,
)
// Debug can be turned on by SWAGGER_DEBUG or DEBUG env variable
scyllaRuntime.Debug = false
scyllaOps := scyllaOperations.New(retryable(scyllaRuntime, config, logger), strfmt.Default)
return &Client{
config: config,
logger: logger,
scyllaOps: scyllaOps,
transport: transport,
dcCache: make(map[string]string),
}, nil
}
// HostDatacenter looks up the datacenter that the given host belongs to.
func (c *Client) HostDatacenter(ctx context.Context, host string) (dc string, err error) {
// Try reading from cache
c.mu.RLock()
dc = c.dcCache[host]
c.mu.RUnlock()
if dc != "" {
return
}
resp, err := c.scyllaOps.SnitchDatacenterGet(&scyllaOperations.SnitchDatacenterGetParams{
Context: ctx,
Host: &host,
})
if err != nil {
return "", err
}
dc = resp.Payload
return
}
func (c *Client) Status(ctx context.Context, host string) (NodeStatusInfoSlice, error) {
// Always query same host
ctx = forceHost(ctx, host)
// Get all hosts
resp, err := c.scyllaOps.StorageServiceHostIDGet(&scyllaOperations.StorageServiceHostIDGetParams{Context: ctx})
if err != nil {
return nil, err
}
all := make([]NodeStatusInfo, len(resp.Payload))
for i, p := range resp.Payload {
all[i].Addr = p.Key
all[i].HostID = p.Value
}
// Get host datacenter (hopefully cached)
for i := range all {
all[i].Datacenter, err = c.HostDatacenter(ctx, all[i].Addr)
if err != nil {
return nil, err
}
}
// Get live nodes
live, err := c.scyllaOps.GossiperEndpointLiveGet(&scyllaOperations.GossiperEndpointLiveGetParams{Context: ctx})
if err != nil {
return nil, err
}
setNodeStatus(all, NodeStatusUp, live.Payload)
// Get joining nodes
joining, err := c.scyllaOps.StorageServiceNodesJoiningGet(&scyllaOperations.StorageServiceNodesJoiningGetParams{Context: ctx})
if err != nil {
return nil, err
}
setNodeState(all, NodeStateJoining, joining.Payload)
// Get leaving nodes
leaving, err := c.scyllaOps.StorageServiceNodesLeavingGet(&scyllaOperations.StorageServiceNodesLeavingGetParams{Context: ctx})
if err != nil {
return nil, err
}
setNodeState(all, NodeStateLeaving, leaving.Payload)
// Get moving nodes
moving, err := c.scyllaOps.StorageServiceNodesMovingGet(&scyllaOperations.StorageServiceNodesMovingGetParams{Context: ctx})
if err != nil {
return nil, err
}
setNodeState(all, NodeStateMoving, moving.Payload)
// Sort by Datacenter and Address
sort.Slice(all, func(i, j int) bool {
if all[i].Datacenter != all[j].Datacenter {
return all[i].Datacenter < all[j].Datacenter
}
return all[i].Addr < all[j].Addr
})
return all, nil
}
func (c *Client) Decommission(ctx context.Context, host string) error {
_, err := c.scyllaOps.StorageServiceDecommissionPost(&scyllaOperations.StorageServiceDecommissionPostParams{Context: forceHost(ctx, host)})
if err != nil {
return err
}
return nil
}
func (c *Client) OperationMode(ctx context.Context, host string) (OperationalMode, error) {
resp, err := c.scyllaOps.StorageServiceOperationModeGet(&scyllaOperations.StorageServiceOperationModeGetParams{Context: forceHost(ctx, host)})
if err != nil {
return "", err
}
return operationalModeFromString(resp.Payload), nil
}
func DefaultTransport() *http.Transport {
return &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
MaxIdleConnsPerHost: runtime.GOMAXPROCS(0) + 1,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
}
}
func setNodeState(all []NodeStatusInfo, state NodeState, addrs []string) {
if len(addrs) == 0 {
return
}
m := strset.New(addrs...)
for i := range all {
if m.Has(all[i].Addr) {
all[i].State = state
}
}
}
func setNodeStatus(all []NodeStatusInfo, status NodeStatus, addrs []string) {
if len(addrs) == 0 {
return
}
m := strset.New(addrs...)
for i := range all {
if m.Has(all[i].Addr) {
all[i].Status = status
}
}
}
var setOpenAPIGlobalsOnce sync.Once
func setOpenAPIGlobals() {
setOpenAPIGlobalsOnce.Do(func() {
// Timeout is defined in http client that we provide in api.NewWithClient.
// If Context is provided to operation, which is always the case here,
// this value has no meaning since OpenAPI runtime ignores it.
api.DefaultTimeout = 0
// Disable debug output to stderr, it could have been enabled by setting
// SWAGGER_DEBUG or DEBUG env variables.
apiMiddleware.Debug = false
})
}
// fixContentType adjusts Scylla REST API response so that it can be consumed
// by Open API.
func fixContentType(next http.RoundTripper) http.RoundTripper {
return httpx.RoundTripperFunc(func(req *http.Request) (resp *http.Response, err error) {
defer func() {
if resp != nil {
// Force JSON, Scylla returns "text/plain" that misleads the
// unmarshaller and breaks processing.
resp.Header.Set("Content-Type", "application/json")
}
}()
return next.RoundTrip(req)
})
}