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client.go
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client.go
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package hdfs
import (
"context"
"errors"
"io/ioutil"
hdfs "github.com/colinmarc/hdfs/v2"
"github.com/kubemq-hub/builder/connector/common"
"github.com/kubemq-io/kubemq-targets/config"
"github.com/kubemq-io/kubemq-targets/pkg/logger"
"github.com/kubemq-io/kubemq-targets/types"
)
type Client struct {
log *logger.Logger
opts options
client *hdfs.Client
}
func New() *Client {
return &Client{}
}
func (c *Client) Connector() *common.Connector {
return Connector()
}
func (c *Client) Init(ctx context.Context, cfg config.Spec, log *logger.Logger) error {
c.log = log
if c.log == nil {
c.log = logger.NewLogger(cfg.Kind)
}
var err error
c.opts, err = parseOptions(cfg)
if err != nil {
return err
}
co := setClientOption(c.opts)
c.client, err = hdfs.NewClient(co)
if err != nil {
return err
}
return nil
}
func (c *Client) Do(ctx context.Context, req *types.Request) (*types.Response, error) {
meta, err := parseMetadata(req.Metadata)
if err != nil {
return nil, err
}
switch meta.method {
case "read_file":
return c.readFile(meta)
case "write_file":
return c.writeFile(meta, req.Data)
case "remove_file":
return c.removeFile(meta)
case "rename_file":
return c.renameFile(meta)
case "mkdir":
return c.makeDir(meta)
case "stat":
return c.stat(meta)
default:
return nil, errors.New("invalid method type")
}
}
func (c *Client) writeFile(meta metadata, data []byte) (*types.Response, error) {
writer, err := c.client.Create(meta.filePath)
if err != nil {
return nil, err
}
_, err = writer.Write(data)
if err != nil {
return nil, err
}
return types.NewResponse().
SetMetadataKeyValue("result", "ok"),
nil
}
func (c *Client) makeDir(meta metadata) (*types.Response, error) {
err := c.client.Mkdir(meta.filePath, meta.fileMode)
if err != nil {
return nil, err
}
return types.NewResponse().
SetMetadataKeyValue("result", "ok"),
nil
}
func (c *Client) removeFile(meta metadata) (*types.Response, error) {
err := c.client.Remove(meta.filePath)
if err != nil {
return nil, err
}
return types.NewResponse().
SetMetadataKeyValue("result", "ok"),
nil
}
func (c *Client) renameFile(meta metadata) (*types.Response, error) {
err := c.client.Rename(meta.oldFilePath, meta.filePath)
if err != nil {
return nil, err
}
return types.NewResponse().
SetMetadataKeyValue("result", "ok"),
nil
}
func (c *Client) stat(meta metadata) (*types.Response, error) {
file, err := c.client.Stat(meta.filePath)
if err != nil {
return nil, err
}
b, err := createStatAsByteArray(file)
if err != nil {
return nil, err
}
return types.NewResponse().
SetData(b).
SetMetadataKeyValue("result", "ok"),
nil
}
func (c *Client) readFile(meta metadata) (*types.Response, error) {
file, err := c.client.Open(meta.filePath)
if err != nil {
return nil, err
}
bytes, err := ioutil.ReadAll(file)
if err != nil {
return nil, err
}
return types.NewResponse().
SetData(bytes).
SetMetadataKeyValue("result", "ok"),
nil
}
func (c *Client) Stop() error {
if c.client != nil {
return c.client.Close()
}
return nil
}
func setClientOption(opts options) hdfs.ClientOptions {
c := hdfs.ClientOptions{}
if opts.address != "" {
c.Addresses = append(c.Addresses, opts.address)
}
if opts.user != "" {
c.User = opts.user
}
return c
}