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client.go
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client.go
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package experiment
import (
"bufio"
"bytes"
"context"
"io"
"time"
"github.com/fsnotify/fsnotify"
tui "github.com/marcusolsson/tui-go"
builder "github.com/rai-project/micro18-tools/pkg/builder"
watcher "github.com/rai-project/micro18-tools/pkg/watcher"
)
type Client struct {
ctx context.Context
path string
output io.Reader
content bytes.Buffer
builder *builder.Builder
watcher *watcher.Watcher
widget *OutputWidget
}
func NewClient(ctx context.Context, ui tui.UI) *Client {
ctx = context.WithValue(ctx, "name", "client")
outputReader, outputWriter := io.Pipe()
widget := NewOutputWidget("Client", ui)
client := &Client{
output: outputReader,
content: bytes.Buffer{},
widget: widget,
builder: &builder.Builder{
Ctx: context.WithValue(ctx, "name", "client-builder"),
Stderr: outputWriter,
Stdout: outputWriter,
BaseDir: Config.ClientPath,
BuildCmd: Config.ClientBuildCmd,
},
}
defer func() {
go client.listen()
}()
client.watcher = watcher.New(
client.Notify,
Config.ClientPath,
Config.ServerPath, // changes to the server should trigger the client to rerun
)
return client
}
func (c *Client) listen() (err error) {
// If the buffer overflows, we will get bytes.ErrTooLarge.
// Return that as an error. Any other panic remains.
defer func() {
e := recover()
if e == nil {
return
}
if panicErr, ok := e.(error); ok && panicErr == bytes.ErrTooLarge {
err = panicErr
} else {
log.Panic(e)
}
}()
nBytes, nChunks := int64(0), int64(0)
r := bufio.NewReader(c.output)
buf := make([]byte, 0, bytes.MinRead)
for {
n, err := r.Read(buf[:cap(buf)])
buf = buf[:n]
if n == 0 {
if err == nil {
continue
}
if err == io.EOF {
break
}
log.Fatal(err)
}
nChunks++
nBytes += int64(len(buf))
c.content.Write(buf)
if err != nil && err != io.EOF {
log.Fatal(err)
}
c.widget.SetText(c.content.String())
}
return
}
func (c *Client) Widget() *OutputWidget {
return c.widget
}
func (c *Client) build(ev fsnotify.Event) error {
builderCtx, cancel := context.WithCancel(c.builder.Ctx)
done := make(chan struct{})
defer func() {
close(done)
}()
go func() {
ticker := time.Tick(time.Second)
for {
select {
case <-ticker:
c.widget.SetBuildStatus(c.builder.State)
case <-done:
cancel()
return
}
}
}()
err := c.builder.Rebuild(builderCtx)
return err
}
func (c *Client) run(ev fsnotify.Event) error {
// rerun the client
return nil
}
func (c *Client) Notify(ev fsnotify.Event) {
if err := c.build(ev); err != nil {
return
}
}