110 lines
2.2 KiB
Go
110 lines
2.2 KiB
Go
// Package pinqueue implements an ipfs-cluster informer which issues the
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// current size of the pinning queue.
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package pinqueue
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import (
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"context"
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"fmt"
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"sync"
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"github.com/ipfs-cluster/ipfs-cluster/api"
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rpc "github.com/libp2p/go-libp2p-gorpc"
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"go.opencensus.io/trace"
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)
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// MetricName specifies the name of our metric
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var MetricName = "pinqueue"
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// Informer is a simple object to implement the ipfscluster.Informer
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// and Component interfaces
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type Informer struct {
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config *Config
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mu sync.Mutex
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rpcClient *rpc.Client
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}
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// New returns an initialized Informer.
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func New(cfg *Config) (*Informer, error) {
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err := cfg.Validate()
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if err != nil {
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return nil, err
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}
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return &Informer{
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config: cfg,
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}, nil
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}
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// SetClient provides us with an rpc.Client which allows
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// contacting other components in the cluster.
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func (inf *Informer) SetClient(c *rpc.Client) {
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inf.mu.Lock()
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inf.rpcClient = c
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inf.mu.Unlock()
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}
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// Shutdown is called on cluster shutdown. We just invalidate
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// any metrics from this point.
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func (inf *Informer) Shutdown(ctx context.Context) error {
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_, span := trace.StartSpan(ctx, "informer/numpin/Shutdown")
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defer span.End()
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inf.mu.Lock()
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inf.rpcClient = nil
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inf.mu.Unlock()
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return nil
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}
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// Name returns the name of this informer
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func (inf *Informer) Name() string {
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return MetricName
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}
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// GetMetrics contacts the Pintracker component and requests the number of
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// queued items for pinning.
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func (inf *Informer) GetMetrics(ctx context.Context) []api.Metric {
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ctx, span := trace.StartSpan(ctx, "informer/pinqueue/GetMetric")
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defer span.End()
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inf.mu.Lock()
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rpcClient := inf.rpcClient
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inf.mu.Unlock()
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if rpcClient == nil {
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return []api.Metric{
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{
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Valid: false,
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},
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}
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}
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var queued int64
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err := rpcClient.CallContext(
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ctx,
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"",
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"PinTracker",
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"PinQueueSize",
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struct{}{},
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&queued,
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)
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valid := err == nil
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weight := -queued // smaller pin queues have more priority
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if div := inf.config.WeightBucketSize; div > 0 {
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weight = weight / int64(div)
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}
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m := api.Metric{
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Name: MetricName,
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Value: fmt.Sprintf("%d", queued),
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Valid: valid,
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Partitionable: false,
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Weight: weight,
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}
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m.SetTTL(inf.config.MetricTTL)
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return []api.Metric{m}
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}
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