432 lines
10 KiB
Go
432 lines
10 KiB
Go
package api
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"strconv"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
// OriginStart and OriginEnd are the available parameters for the origin
|
|
// argument when streaming a file. They respectively offset from the start
|
|
// and end of a file.
|
|
OriginStart = "start"
|
|
OriginEnd = "end"
|
|
)
|
|
|
|
// AllocFileInfo holds information about a file inside the AllocDir
|
|
type AllocFileInfo struct {
|
|
Name string
|
|
IsDir bool
|
|
Size int64
|
|
FileMode string
|
|
ModTime time.Time
|
|
}
|
|
|
|
// StreamFrame is used to frame data of a file when streaming
|
|
type StreamFrame struct {
|
|
Offset int64 `json:",omitempty"`
|
|
Data []byte `json:",omitempty"`
|
|
File string `json:",omitempty"`
|
|
FileEvent string `json:",omitempty"`
|
|
}
|
|
|
|
// IsHeartbeat returns if the frame is a heartbeat frame
|
|
func (s *StreamFrame) IsHeartbeat() bool {
|
|
return len(s.Data) == 0 && s.FileEvent == "" && s.File == "" && s.Offset == 0
|
|
}
|
|
|
|
// 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) {
|
|
if q == nil {
|
|
q = &QueryOptions{}
|
|
}
|
|
if q.Params == nil {
|
|
q.Params = make(map[string]string)
|
|
}
|
|
q.Params["path"] = path
|
|
|
|
var resp []*AllocFileInfo
|
|
qm, err := a.client.query(fmt.Sprintf("/v1/client/fs/ls/%s", alloc.ID), &resp, q)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
return resp, qm, 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) {
|
|
if q == nil {
|
|
q = &QueryOptions{}
|
|
}
|
|
if q.Params == nil {
|
|
q.Params = make(map[string]string)
|
|
}
|
|
|
|
q.Params["path"] = path
|
|
|
|
var resp AllocFileInfo
|
|
qm, err := a.client.query(fmt.Sprintf("/v1/client/fs/stat/%s", alloc.ID), &resp, q)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return &resp, qm, nil
|
|
}
|
|
|
|
// ReadAt is used to read bytes at a given offset until limit at the given path
|
|
// in an allocation directory. If limit is <= 0, there is no limit.
|
|
func (a *AllocFS) ReadAt(alloc *Allocation, path string, offset int64, limit int64, q *QueryOptions) (io.ReadCloser, error) {
|
|
nodeClient, err := a.client.GetNodeClientWithTimeout(alloc.NodeID, ClientConnTimeout, q)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if q == nil {
|
|
q = &QueryOptions{}
|
|
}
|
|
if q.Params == nil {
|
|
q.Params = make(map[string]string)
|
|
}
|
|
|
|
q.Params["path"] = path
|
|
q.Params["offset"] = strconv.FormatInt(offset, 10)
|
|
q.Params["limit"] = strconv.FormatInt(limit, 10)
|
|
|
|
reqPath := fmt.Sprintf("/v1/client/fs/readat/%s", alloc.ID)
|
|
r, err := nodeClient.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
// There was a networking error when talking directly to the client.
|
|
if _, ok := err.(net.Error); !ok {
|
|
return nil, err
|
|
}
|
|
|
|
// Try via the server
|
|
r, err = a.client.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return r, 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.ReadCloser, error) {
|
|
nodeClient, err := a.client.GetNodeClientWithTimeout(alloc.NodeID, ClientConnTimeout, q)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if q == nil {
|
|
q = &QueryOptions{}
|
|
}
|
|
if q.Params == nil {
|
|
q.Params = make(map[string]string)
|
|
}
|
|
|
|
q.Params["path"] = path
|
|
reqPath := fmt.Sprintf("/v1/client/fs/cat/%s", alloc.ID)
|
|
r, err := nodeClient.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
// There was a networking error when talking directly to the client.
|
|
if _, ok := err.(net.Error); !ok {
|
|
return nil, err
|
|
}
|
|
|
|
// Try via the server
|
|
r, err = a.client.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return r, nil
|
|
}
|
|
|
|
// Stream streams the content of a file blocking on EOF.
|
|
// The parameters are:
|
|
// * path: path to file to stream.
|
|
// * offset: The offset to start streaming data at.
|
|
// * origin: Either "start" or "end" and defines from where the offset is applied.
|
|
// * cancel: A channel that when closed, streaming will end.
|
|
//
|
|
// The return value is a channel that will emit StreamFrames as they are read.
|
|
func (a *AllocFS) Stream(alloc *Allocation, path, origin string, offset int64,
|
|
cancel <-chan struct{}, q *QueryOptions) (<-chan *StreamFrame, <-chan error) {
|
|
|
|
errCh := make(chan error, 1)
|
|
nodeClient, err := a.client.GetNodeClientWithTimeout(alloc.NodeID, ClientConnTimeout, q)
|
|
if err != nil {
|
|
errCh <- err
|
|
return nil, errCh
|
|
}
|
|
|
|
if q == nil {
|
|
q = &QueryOptions{}
|
|
}
|
|
if q.Params == nil {
|
|
q.Params = make(map[string]string)
|
|
}
|
|
|
|
q.Params["path"] = path
|
|
q.Params["offset"] = strconv.FormatInt(offset, 10)
|
|
q.Params["origin"] = origin
|
|
|
|
reqPath := fmt.Sprintf("/v1/client/fs/stream/%s", alloc.ID)
|
|
r, err := nodeClient.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
// There was a networking error when talking directly to the client.
|
|
if _, ok := err.(net.Error); !ok {
|
|
errCh <- err
|
|
return nil, errCh
|
|
}
|
|
|
|
// Try via the server
|
|
r, err = a.client.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
errCh <- err
|
|
return nil, errCh
|
|
}
|
|
}
|
|
|
|
// Create the output channel
|
|
frames := make(chan *StreamFrame, 10)
|
|
|
|
go func() {
|
|
// Close the body
|
|
defer r.Close()
|
|
|
|
// Create a decoder
|
|
dec := json.NewDecoder(r)
|
|
|
|
for {
|
|
// Check if we have been cancelled
|
|
select {
|
|
case <-cancel:
|
|
return
|
|
default:
|
|
}
|
|
|
|
// Decode the next frame
|
|
var frame StreamFrame
|
|
if err := dec.Decode(&frame); err != nil {
|
|
errCh <- err
|
|
close(frames)
|
|
return
|
|
}
|
|
|
|
// Discard heartbeat frames
|
|
if frame.IsHeartbeat() {
|
|
continue
|
|
}
|
|
|
|
frames <- &frame
|
|
}
|
|
}()
|
|
|
|
return frames, errCh
|
|
}
|
|
|
|
// Logs streams the content of a tasks logs blocking on EOF.
|
|
// The parameters are:
|
|
// * allocation: the allocation to stream from.
|
|
// * follow: Whether the logs should be followed.
|
|
// * task: the tasks name to stream logs for.
|
|
// * logType: Either "stdout" or "stderr"
|
|
// * origin: Either "start" or "end" and defines from where the offset is applied.
|
|
// * offset: The offset to start streaming data at.
|
|
// * cancel: A channel that when closed, streaming will end.
|
|
//
|
|
// The return value is a channel that will emit StreamFrames as they are read.
|
|
func (a *AllocFS) Logs(alloc *Allocation, follow bool, task, logType, origin string,
|
|
offset int64, cancel <-chan struct{}, q *QueryOptions) (<-chan *StreamFrame, <-chan error) {
|
|
|
|
errCh := make(chan error, 1)
|
|
nodeClient, err := a.client.GetNodeClientWithTimeout(alloc.NodeID, ClientConnTimeout, q)
|
|
if err != nil {
|
|
errCh <- err
|
|
return nil, errCh
|
|
}
|
|
|
|
if q == nil {
|
|
q = &QueryOptions{}
|
|
}
|
|
if q.Params == nil {
|
|
q.Params = make(map[string]string)
|
|
}
|
|
|
|
q.Params["follow"] = strconv.FormatBool(follow)
|
|
q.Params["task"] = task
|
|
q.Params["type"] = logType
|
|
q.Params["origin"] = origin
|
|
q.Params["offset"] = strconv.FormatInt(offset, 10)
|
|
|
|
reqPath := fmt.Sprintf("/v1/client/fs/logs/%s", alloc.ID)
|
|
r, err := nodeClient.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
// There was a networking error when talking directly to the client.
|
|
if _, ok := err.(net.Error); !ok {
|
|
errCh <- err
|
|
return nil, errCh
|
|
}
|
|
|
|
// Try via the server
|
|
r, err = a.client.rawQuery(reqPath, q)
|
|
if err != nil {
|
|
errCh <- err
|
|
return nil, errCh
|
|
}
|
|
}
|
|
|
|
// Create the output channel
|
|
frames := make(chan *StreamFrame, 10)
|
|
|
|
go func() {
|
|
// Close the body
|
|
defer r.Close()
|
|
|
|
// Create a decoder
|
|
dec := json.NewDecoder(r)
|
|
|
|
for {
|
|
// Check if we have been cancelled
|
|
select {
|
|
case <-cancel:
|
|
return
|
|
default:
|
|
}
|
|
|
|
// Decode the next frame
|
|
var frame StreamFrame
|
|
if err := dec.Decode(&frame); err != nil {
|
|
errCh <- err
|
|
close(frames)
|
|
return
|
|
}
|
|
|
|
// Discard heartbeat frames
|
|
if frame.IsHeartbeat() {
|
|
continue
|
|
}
|
|
|
|
frames <- &frame
|
|
}
|
|
}()
|
|
|
|
return frames, errCh
|
|
}
|
|
|
|
// FrameReader is used to convert a stream of frames into a read closer.
|
|
type FrameReader struct {
|
|
frames <-chan *StreamFrame
|
|
errCh <-chan error
|
|
cancelCh chan struct{}
|
|
|
|
closedLock sync.Mutex
|
|
closed bool
|
|
|
|
unblockTime time.Duration
|
|
|
|
frame *StreamFrame
|
|
frameOffset int
|
|
|
|
byteOffset int
|
|
}
|
|
|
|
// NewFrameReader takes a channel of frames and returns a FrameReader which
|
|
// implements io.ReadCloser
|
|
func NewFrameReader(frames <-chan *StreamFrame, errCh <-chan error, cancelCh chan struct{}) *FrameReader {
|
|
return &FrameReader{
|
|
frames: frames,
|
|
errCh: errCh,
|
|
cancelCh: cancelCh,
|
|
}
|
|
}
|
|
|
|
// SetUnblockTime sets the time to unblock and return zero bytes read. If the
|
|
// duration is unset or is zero or less, the read will block til data is read.
|
|
func (f *FrameReader) SetUnblockTime(d time.Duration) {
|
|
f.unblockTime = d
|
|
}
|
|
|
|
// Offset returns the offset into the stream.
|
|
func (f *FrameReader) Offset() int {
|
|
return f.byteOffset
|
|
}
|
|
|
|
// Read reads the data of the incoming frames into the bytes buffer. Returns EOF
|
|
// when there are no more frames.
|
|
func (f *FrameReader) Read(p []byte) (n int, err error) {
|
|
f.closedLock.Lock()
|
|
closed := f.closed
|
|
f.closedLock.Unlock()
|
|
if closed {
|
|
return 0, io.EOF
|
|
}
|
|
|
|
if f.frame == nil {
|
|
var unblock <-chan time.Time
|
|
if f.unblockTime.Nanoseconds() > 0 {
|
|
unblock = time.After(f.unblockTime)
|
|
}
|
|
|
|
select {
|
|
case frame, ok := <-f.frames:
|
|
if !ok {
|
|
return 0, io.EOF
|
|
}
|
|
f.frame = frame
|
|
|
|
// Store the total offset into the file
|
|
f.byteOffset = int(f.frame.Offset)
|
|
case <-unblock:
|
|
return 0, nil
|
|
case err := <-f.errCh:
|
|
return 0, err
|
|
case <-f.cancelCh:
|
|
return 0, io.EOF
|
|
}
|
|
}
|
|
|
|
// Copy the data out of the frame and update our offset
|
|
n = copy(p, f.frame.Data[f.frameOffset:])
|
|
f.frameOffset += n
|
|
|
|
// Clear the frame and its offset once we have read everything
|
|
if len(f.frame.Data) == f.frameOffset {
|
|
f.frame = nil
|
|
f.frameOffset = 0
|
|
}
|
|
|
|
return n, nil
|
|
}
|
|
|
|
// Close cancels the stream of frames
|
|
func (f *FrameReader) Close() error {
|
|
f.closedLock.Lock()
|
|
defer f.closedLock.Unlock()
|
|
if f.closed {
|
|
return nil
|
|
}
|
|
|
|
close(f.cancelCh)
|
|
f.closed = true
|
|
return nil
|
|
}
|