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fs.go
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fs.go
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package api
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"time"
)
// AllocFileInfo holds information about a file inside the AllocDir
type AllocFileInfo struct {
Name string
IsDir bool
Size int64
FileMode string
ModTime time.Time
}
// AllocFS is used to introspect an allocation directory on a Nomad client
type AllocFS struct {
client *Client
}
// AllocFS returns an handle to the AllocFS endpoints
func (c *Client) AllocFS() *AllocFS {
return &AllocFS{client: c}
}
// List is used to list the files at a given path of an allocation directory
func (a *AllocFS) List(alloc *Allocation, path string, q *QueryOptions) ([]*AllocFileInfo, *QueryMeta, error) {
node, _, err := a.client.Nodes().Info(alloc.NodeID, &QueryOptions{})
if err != nil {
return nil, nil, err
}
if node.HTTPAddr == "" {
return nil, nil, fmt.Errorf("http addr of the node where alloc %q is running is not advertised", alloc.ID)
}
u := &url.URL{
Scheme: "http",
Host: node.HTTPAddr,
Path: fmt.Sprintf("/v1/client/fs/ls/%s", alloc.ID),
}
v := url.Values{}
v.Set("path", path)
u.RawQuery = v.Encode()
req := &http.Request{
Method: "GET",
URL: u,
}
c := http.Client{}
resp, err := c.Do(req)
if err != nil {
return nil, nil, err
}
if resp.StatusCode != 200 {
return nil, nil, a.getErrorMsg(resp)
}
decoder := json.NewDecoder(resp.Body)
var files []*AllocFileInfo
if err := decoder.Decode(&files); err != nil {
return nil, nil, err
}
return files, nil, nil
}
// Stat is used to stat a file at a given path of an allocation directory
func (a *AllocFS) Stat(alloc *Allocation, path string, q *QueryOptions) (*AllocFileInfo, *QueryMeta, error) {
node, _, err := a.client.Nodes().Info(alloc.NodeID, &QueryOptions{})
if err != nil {
return nil, nil, err
}
if node.HTTPAddr == "" {
return nil, nil, fmt.Errorf("http addr of the node where alloc %q is running is not advertised", alloc.ID)
}
u := &url.URL{
Scheme: "http",
Host: node.HTTPAddr,
Path: fmt.Sprintf("/v1/client/fs/stat/%s", alloc.ID),
}
v := url.Values{}
v.Set("path", path)
u.RawQuery = v.Encode()
req := &http.Request{
Method: "GET",
URL: u,
}
c := http.Client{}
resp, err := c.Do(req)
if err != nil {
return nil, nil, err
}
if resp.StatusCode != 200 {
return nil, nil, a.getErrorMsg(resp)
}
decoder := json.NewDecoder(resp.Body)
var file *AllocFileInfo
if err := decoder.Decode(&file); err != nil {
return nil, nil, err
}
return file, nil, nil
}
// ReadAt is used to read bytes at a given offset until limit at the given path
// in an allocation directory
func (a *AllocFS) ReadAt(alloc *Allocation, path string, offset int64, limit int64, q *QueryOptions) (io.Reader, *QueryMeta, error) {
node, _, err := a.client.Nodes().Info(alloc.NodeID, &QueryOptions{})
if err != nil {
return nil, nil, err
}
if node.HTTPAddr == "" {
return nil, nil, fmt.Errorf("http addr of the node where alloc %q is running is not advertised", alloc.ID)
}
u := &url.URL{
Scheme: "http",
Host: node.HTTPAddr,
Path: fmt.Sprintf("/v1/client/fs/readat/%s", alloc.ID),
}
v := url.Values{}
v.Set("path", path)
v.Set("offset", strconv.FormatInt(offset, 10))
v.Set("limit", strconv.FormatInt(limit, 10))
u.RawQuery = v.Encode()
req := &http.Request{
Method: "GET",
URL: u,
}
c := http.Client{}
resp, err := c.Do(req)
if err != nil {
return nil, nil, err
}
return resp.Body, nil, nil
}
// Cat is used to read contents of a file at the given path in an allocation
// directory
func (a *AllocFS) Cat(alloc *Allocation, path string, q *QueryOptions) (io.Reader, *QueryMeta, error) {
node, _, err := a.client.Nodes().Info(alloc.NodeID, &QueryOptions{})
if err != nil {
return nil, nil, err
}
if node.HTTPAddr == "" {
return nil, nil, fmt.Errorf("http addr of the node where alloc %q is running is not advertised", alloc.ID)
}
u := &url.URL{
Scheme: "http",
Host: node.HTTPAddr,
Path: fmt.Sprintf("/v1/client/fs/cat/%s", alloc.ID),
}
v := url.Values{}
v.Set("path", path)
u.RawQuery = v.Encode()
req := &http.Request{
Method: "GET",
URL: u,
}
c := http.Client{}
resp, err := c.Do(req)
if err != nil {
return nil, nil, err
}
return resp.Body, nil, nil
}
func (a *AllocFS) getErrorMsg(resp *http.Response) error {
if errMsg, err := ioutil.ReadAll(resp.Body); err == nil {
return fmt.Errorf(string(errMsg))
} else {
return err
}
}