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|
package progress
import (
"maps"
"sort"
"sync"
"time"
)
type rawProgressWriter interface {
WriteRawProgress(*Progress) error
Close() error
}
type MultiWriter struct {
mu sync.Mutex
items []*Progress
writers map[rawProgressWriter]struct{}
meta map[string]interface{}
}
var _ rawProgressWriter = &MultiWriter{}
func NewMultiWriter(opts ...WriterOption) *MultiWriter {
mw := &MultiWriter{
writers: map[rawProgressWriter]struct{}{},
meta: map[string]interface{}{},
}
for _, o := range opts {
o(mw)
}
return mw
}
func (ps *MultiWriter) Add(pw Writer) {
rw, ok := pw.(rawProgressWriter)
if !ok {
return
}
if pws, ok := rw.(*MultiWriter); ok {
if pws.contains(ps) {
// this would cause a deadlock, so we should panic instead
// NOTE: this can be caused by a cycle in the scheduler states,
// which is created by a series of unfortunate edge merges
panic("multiwriter loop detected")
}
}
ps.mu.Lock()
plist := make([]*Progress, 0, len(ps.items))
plist = append(plist, ps.items...)
sort.Slice(plist, func(i, j int) bool {
return plist[i].Timestamp.Before(plist[j].Timestamp)
})
for _, p := range plist {
rw.WriteRawProgress(p)
}
ps.writers[rw] = struct{}{}
ps.mu.Unlock()
}
func (ps *MultiWriter) Delete(pw Writer) {
rw, ok := pw.(rawProgressWriter)
if !ok {
return
}
ps.mu.Lock()
delete(ps.writers, rw)
ps.mu.Unlock()
}
func (ps *MultiWriter) Write(id string, v interface{}) error {
p := &Progress{
ID: id,
Timestamp: time.Now(),
Sys: v,
meta: ps.meta,
}
return ps.writeRawProgress(p)
}
func (ps *MultiWriter) WriteRawProgress(p *Progress) error {
meta := p.meta
if len(ps.meta) > 0 {
meta = map[string]interface{}{}
maps.Copy(meta, p.meta)
for k, v := range ps.meta {
if _, ok := meta[k]; !ok {
meta[k] = v
}
}
}
p.meta = meta
return ps.writeRawProgress(p)
}
func (ps *MultiWriter) writeRawProgress(p *Progress) error {
ps.mu.Lock()
defer ps.mu.Unlock()
ps.items = append(ps.items, p)
for w := range ps.writers {
if err := w.WriteRawProgress(p); err != nil {
return err
}
}
return nil
}
func (ps *MultiWriter) Close() error {
return nil
}
func (ps *MultiWriter) contains(pw rawProgressWriter) bool {
ps.mu.Lock()
defer ps.mu.Unlock()
_, ok := ps.writers[pw]
if ok {
return true
}
for w := range ps.writers {
w, ok := w.(*MultiWriter)
if !ok {
continue
}
if w.contains(pw) {
return true
}
}
return false
}
|
