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Ian Gulliver
2023-05-15 21:13:00 -07:00
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<title>storebus: Go Coverage Report</title>
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<option value="file0">github.com/gopatchy/storebus/storebus.go (85.5%)</option>
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<span>not tracked</span>
<span class="cov0">no coverage</span>
<span class="cov1">low coverage</span>
<span class="cov2">*</span>
<span class="cov3">*</span>
<span class="cov4">*</span>
<span class="cov5">*</span>
<span class="cov6">*</span>
<span class="cov7">*</span>
<span class="cov8">*</span>
<span class="cov9">*</span>
<span class="cov10">high coverage</span>
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<pre class="file" id="file0" style="display: none">package storebus
import (
"context"
"crypto/sha256"
"encoding/json"
"fmt"
"sync"
"github.com/gopatchy/bus"
"github.com/gopatchy/jsrest"
"github.com/gopatchy/metadata"
"github.com/gopatchy/store"
)
type StoreBus struct {
store *store.Store
bus *bus.Bus
// This lock ensures that no writes interleave with read/subscribe pairs
orderMu sync.RWMutex
chanMap map[&lt;-chan []any]&lt;-chan any
chanMapMu sync.Mutex
}
func NewStoreBus(dbname string) (*StoreBus, error) <span class="cov5" title="2">{
st, err := store.NewStore(dbname)
if err != nil </span><span class="cov0" title="0">{
return nil, err
}</span>
<span class="cov5" title="2">return &amp;StoreBus{
store: st,
bus: bus.NewBus(),
chanMap: map[&lt;-chan []any]&lt;-chan any{},
}, nil</span>
}
func (sb *StoreBus) Close() <span class="cov5" title="2">{
sb.store.Close()
}</span>
func (sb *StoreBus) Write(ctx context.Context, t string, obj any) error <span class="cov10" title="4">{
sb.orderMu.Lock()
defer sb.orderMu.Unlock()
if err := UpdateHash(obj); err != nil </span><span class="cov0" title="0">{
return jsrest.Errorf(jsrest.ErrInternalServerError, "hash update failed (%w)", err)
}</span>
<span class="cov10" title="4">if err := sb.store.Write(ctx, t, obj); err != nil </span><span class="cov0" title="0">{
return jsrest.Errorf(jsrest.ErrInternalServerError, "write failed (%w)", err)
}</span>
<span class="cov10" title="4">sb.bus.Announce(t, obj)
return nil</span>
}
func (sb *StoreBus) Delete(ctx context.Context, t, id string) error <span class="cov1" title="1">{
sb.orderMu.Lock()
defer sb.orderMu.Unlock()
if err := sb.store.Delete(ctx, t, id); err != nil </span><span class="cov0" title="0">{
return jsrest.Errorf(jsrest.ErrInternalServerError, "delete failed (%w)", err)
}</span>
<span class="cov1" title="1">sb.bus.Delete(t, id)
return nil</span>
}
func (sb *StoreBus) Read(ctx context.Context, t, id string, factory func() any) (any, error) <span class="cov1" title="1">{
return sb.store.Read(ctx, t, id, factory)
}</span>
func (sb *StoreBus) ReadStream(ctx context.Context, t, id string, factory func() any) (&lt;-chan any, error) <span class="cov5" title="2">{
sb.orderMu.RLock()
defer sb.orderMu.RUnlock()
initial, err := sb.store.Read(ctx, t, id, factory)
if err != nil </span><span class="cov0" title="0">{
return nil, jsrest.Errorf(jsrest.ErrInternalServerError, "read failed (%w)", err)
}</span>
<span class="cov5" title="2">c := sb.bus.SubscribeKey(t, id, initial)
return c, nil</span>
}
func (sb *StoreBus) CloseReadStream(t, id string, c &lt;-chan any) <span class="cov5" title="2">{
sb.bus.UnsubscribeKey(t, id, c)
}</span>
func (sb *StoreBus) List(ctx context.Context, t string, factory func() any) ([]any, error) <span class="cov5" title="2">{
return sb.store.List(ctx, t, factory)
}</span>
func (sb *StoreBus) ListStream(ctx context.Context, t string, factory func() any) (&lt;-chan []any, error) <span class="cov1" title="1">{
sb.orderMu.RLock()
defer sb.orderMu.RUnlock()
initial, err := sb.store.List(ctx, t, factory)
if err != nil </span><span class="cov0" title="0">{
return nil, jsrest.Errorf(jsrest.ErrInternalServerError, "list failed (%w)", err)
}</span>
<span class="cov1" title="1">c := sb.bus.SubscribeType(t, initial)
ret := make(chan []any, 100)
sb.registerChan(c, ret)
go func() </span><span class="cov1" title="1">{
defer close(ret)
for range c </span><span class="cov8" title="3">{
// List() results are always at least (but not exactly) as new as the write that triggered it
l, err := sb.store.List(ctx, t, factory)
if err != nil </span><span class="cov0" title="0">{
break</span>
}
<span class="cov8" title="3">select </span>{
case ret &lt;- l:<span class="cov8" title="3"></span>
default:<span class="cov0" title="0">
break</span>
}
}
}()
<span class="cov1" title="1">return ret, nil</span>
}
func (sb *StoreBus) CloseListStream(t string, c &lt;-chan []any) <span class="cov1" title="1">{
sb.chanMapMu.Lock()
defer sb.chanMapMu.Unlock()
sb.bus.UnsubscribeType(t, sb.chanMap[c])
delete(sb.chanMap, c)
}</span>
func (sb *StoreBus) registerChan(in &lt;-chan any, out &lt;-chan []any) <span class="cov1" title="1">{
sb.chanMapMu.Lock()
defer sb.chanMapMu.Unlock()
sb.chanMap[out] = in
}</span>
func UpdateHash(obj any) error <span class="cov10" title="4">{
m := *metadata.GetMetadata(obj)
metadata.ClearMetadata(obj)
defer metadata.SetMetadata(obj, &amp;m)
hash := sha256.New()
enc := json.NewEncoder(hash)
if err := enc.Encode(obj); err != nil </span><span class="cov0" title="0">{
return jsrest.Errorf(jsrest.ErrInternalServerError, "JSON encode failed (%w)", err)
}</span>
<span class="cov10" title="4">m.ETag = fmt.Sprintf("etag:%x", hash.Sum(nil))
return nil</span>
}
</pre>
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