3b3f786d68
This commit adds support for OpenCensus tracing and metrics collection. This required support for context.Context propogation throughout the cluster codebase, and in particular, the ipfscluster component interfaces. The tracing propogates across RPC and HTTP boundaries. The current default tracing backend is Jaeger. The metrics currently exports the metrics exposed by the opencensus http plugin as well as the pprof metrics to a prometheus endpoint for scraping. The current default metrics backend is Prometheus. Metrics are currently exposed by default due to low overhead, can be turned off if desired, whereas tracing is off by default as it has a much higher performance overhead, though the extent of the performance hit can be adjusted with smaller sampling rates. License: MIT Signed-off-by: Adrian Lanzafame <adrianlanzafame92@gmail.com>
709 lines
18 KiB
Go
709 lines
18 KiB
Go
// Package ipfshttp implements an IPFS Cluster IPFSConnector component. It
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// uses the IPFS HTTP API to communicate to IPFS.
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package ipfshttp
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/ipfs/ipfs-cluster/api"
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"github.com/ipfs/ipfs-cluster/observations"
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"go.opencensus.io/plugin/ochttp"
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"go.opencensus.io/plugin/ochttp/propagation/tracecontext"
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"go.opencensus.io/stats"
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"go.opencensus.io/trace"
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cid "github.com/ipfs/go-cid"
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files "github.com/ipfs/go-ipfs-files"
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logging "github.com/ipfs/go-log"
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rpc "github.com/libp2p/go-libp2p-gorpc"
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peer "github.com/libp2p/go-libp2p-peer"
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ma "github.com/multiformats/go-multiaddr"
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madns "github.com/multiformats/go-multiaddr-dns"
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manet "github.com/multiformats/go-multiaddr-net"
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)
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// DNSTimeout is used when resolving DNS multiaddresses in this module
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var DNSTimeout = 5 * time.Second
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var logger = logging.Logger("ipfshttp")
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// updateMetricsMod only makes updates to informer metrics
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// on the nth occasion. So, for example, for every BlockPut,
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// only the 10th will trigger a SendInformerMetrics call.
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var updateMetricMod = 10
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// Connector implements the IPFSConnector interface
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// and provides a component which is used to perform
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// on-demand requests against the configured IPFS daemom
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// (such as a pin request).
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type Connector struct {
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ctx context.Context
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cancel func()
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config *Config
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nodeAddr string
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rpcClient *rpc.Client
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rpcReady chan struct{}
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client *http.Client // client to ipfs daemon
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updateMetricMutex sync.Mutex
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updateMetricCount int
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shutdownLock sync.Mutex
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shutdown bool
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wg sync.WaitGroup
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}
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type ipfsError struct {
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Message string
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}
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type ipfsPinType struct {
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Type string
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}
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type ipfsPinLsResp struct {
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Keys map[string]ipfsPinType
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}
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type ipfsIDResp struct {
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ID string
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Addresses []string
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}
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type ipfsSwarmPeersResp struct {
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Peers []ipfsPeer
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}
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type ipfsPeer struct {
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Peer string
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}
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type ipfsStream struct {
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Protocol string
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}
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// NewConnector creates the component and leaves it ready to be started
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func NewConnector(cfg *Config) (*Connector, 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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nodeMAddr := cfg.NodeAddr
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// dns multiaddresses need to be resolved first
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if madns.Matches(nodeMAddr) {
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ctx, cancel := context.WithTimeout(context.Background(), DNSTimeout)
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defer cancel()
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resolvedAddrs, err := madns.Resolve(ctx, cfg.NodeAddr)
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if err != nil {
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logger.Error(err)
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return nil, err
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}
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nodeMAddr = resolvedAddrs[0]
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}
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_, nodeAddr, err := manet.DialArgs(nodeMAddr)
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if err != nil {
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return nil, err
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}
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c := &http.Client{} // timeouts are handled by context timeouts
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if cfg.Tracing {
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c.Transport = &ochttp.Transport{
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Base: http.DefaultTransport,
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Propagation: &tracecontext.HTTPFormat{},
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StartOptions: trace.StartOptions{SpanKind: trace.SpanKindClient},
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FormatSpanName: func(req *http.Request) string { return req.Host + ":" + req.URL.Path + ":" + req.Method },
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NewClientTrace: ochttp.NewSpanAnnotatingClientTrace,
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}
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}
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ctx, cancel := context.WithCancel(context.Background())
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ipfs := &Connector{
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ctx: ctx,
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config: cfg,
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cancel: cancel,
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nodeAddr: nodeAddr,
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rpcReady: make(chan struct{}, 1),
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client: c,
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}
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go ipfs.run()
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return ipfs, nil
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}
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// connects all ipfs daemons when
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// we receive the rpcReady signal.
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func (ipfs *Connector) run() {
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<-ipfs.rpcReady
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// Do not shutdown while launching threads
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// -- prevents race conditions with ipfs.wg.
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ipfs.shutdownLock.Lock()
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defer ipfs.shutdownLock.Unlock()
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// This runs ipfs swarm connect to the daemons of other cluster members
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ipfs.wg.Add(1)
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go func() {
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defer ipfs.wg.Done()
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// It does not hurt to wait a little bit. i.e. think cluster
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// peers which are started at the same time as the ipfs
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// daemon...
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tmr := time.NewTimer(ipfs.config.ConnectSwarmsDelay)
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defer tmr.Stop()
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select {
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case <-tmr.C:
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// do not hang this goroutine if this call hangs
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// otherwise we hang during shutdown
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go ipfs.ConnectSwarms(ipfs.ctx)
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case <-ipfs.ctx.Done():
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return
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}
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}()
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}
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// SetClient makes the component ready to perform RPC
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// requests.
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func (ipfs *Connector) SetClient(c *rpc.Client) {
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ipfs.rpcClient = c
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ipfs.rpcReady <- struct{}{}
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}
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// Shutdown stops any listeners and stops the component from taking
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// any requests.
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func (ipfs *Connector) Shutdown(ctx context.Context) error {
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ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/Shutdown")
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defer span.End()
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ipfs.shutdownLock.Lock()
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defer ipfs.shutdownLock.Unlock()
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if ipfs.shutdown {
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logger.Debug("already shutdown")
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return nil
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}
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logger.Info("stopping IPFS Connector")
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ipfs.cancel()
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close(ipfs.rpcReady)
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ipfs.wg.Wait()
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ipfs.shutdown = true
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return nil
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}
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// ID performs an ID request against the configured
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// IPFS daemon. It returns the fetched information.
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// If the request fails, or the parsing fails, it
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// returns an error and an empty IPFSID which also
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// contains the error message.
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func (ipfs *Connector) ID(ctx context.Context) (api.IPFSID, error) {
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ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/ID")
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defer span.End()
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ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
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defer cancel()
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id := api.IPFSID{}
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body, err := ipfs.postCtx(ctx, "id", "", nil)
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if err != nil {
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id.Error = err.Error()
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return id, err
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}
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var res ipfsIDResp
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err = json.Unmarshal(body, &res)
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if err != nil {
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id.Error = err.Error()
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return id, err
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}
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pID, err := peer.IDB58Decode(res.ID)
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if err != nil {
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id.Error = err.Error()
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return id, err
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}
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id.ID = pID
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mAddrs := make([]ma.Multiaddr, len(res.Addresses), len(res.Addresses))
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for i, strAddr := range res.Addresses {
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mAddr, err := ma.NewMultiaddr(strAddr)
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if err != nil {
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id.Error = err.Error()
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return id, err
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}
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mAddrs[i] = mAddr
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}
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id.Addresses = mAddrs
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return id, nil
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}
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// Pin performs a pin request against the configured IPFS
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// daemon.
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func (ipfs *Connector) Pin(ctx context.Context, hash cid.Cid, maxDepth int) error {
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ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/Pin")
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defer span.End()
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ctx, cancel := context.WithTimeout(ctx, ipfs.config.PinTimeout)
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defer cancel()
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pinStatus, err := ipfs.PinLsCid(ctx, hash)
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if err != nil {
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return err
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}
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if pinStatus.IsPinned(maxDepth) {
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logger.Debug("IPFS object is already pinned: ", hash)
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return nil
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}
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defer ipfs.updateInformerMetric(ctx)
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var pinArgs string
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switch {
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case maxDepth < 0:
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pinArgs = "recursive=true"
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case maxDepth == 0:
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pinArgs = "recursive=false"
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default:
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pinArgs = fmt.Sprintf("recursive=true&max-depth=%d", maxDepth)
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}
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switch ipfs.config.PinMethod {
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case "refs": // do refs -r first
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path := fmt.Sprintf("refs?arg=%s&%s", hash, pinArgs)
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err := ipfs.postDiscardBodyCtx(ctx, path)
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if err != nil {
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return err
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}
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logger.Debugf("Refs for %s sucessfully fetched", hash)
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stats.Record(ctx, observations.PinCountMetric.M(1))
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}
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path := fmt.Sprintf("pin/add?arg=%s&%s", hash, pinArgs)
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_, err = ipfs.postCtx(ctx, path, "", nil)
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if err == nil {
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logger.Info("IPFS Pin request succeeded: ", hash)
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}
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return err
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}
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// Unpin performs an unpin request against the configured IPFS
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// daemon.
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func (ipfs *Connector) Unpin(ctx context.Context, hash cid.Cid) error {
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ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/Unpin")
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defer span.End()
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ctx, cancel := context.WithTimeout(ctx, ipfs.config.UnpinTimeout)
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defer cancel()
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pinStatus, err := ipfs.PinLsCid(ctx, hash)
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if err != nil {
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return err
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}
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if pinStatus.IsPinned(-1) {
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defer ipfs.updateInformerMetric(ctx)
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path := fmt.Sprintf("pin/rm?arg=%s", hash)
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_, err := ipfs.postCtx(ctx, path, "", nil)
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if err != nil {
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return err
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}
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logger.Info("IPFS Unpin request succeeded:", hash)
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stats.Record(ctx, observations.PinCountMetric.M(-1))
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}
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logger.Debug("IPFS object is already unpinned: ", hash)
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return nil
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}
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// PinLs performs a "pin ls --type typeFilter" request against the configured
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// IPFS daemon and returns a map of cid strings and their status.
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func (ipfs *Connector) PinLs(ctx context.Context, typeFilter string) (map[string]api.IPFSPinStatus, error) {
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ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/PinLs")
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defer span.End()
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ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
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defer cancel()
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body, err := ipfs.postCtx(ctx, "pin/ls?type="+typeFilter, "", nil)
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// Some error talking to the daemon
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if err != nil {
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return nil, err
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}
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var res ipfsPinLsResp
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err = json.Unmarshal(body, &res)
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if err != nil {
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logger.Error("parsing pin/ls response")
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logger.Error(string(body))
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return nil, err
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}
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statusMap := make(map[string]api.IPFSPinStatus)
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for k, v := range res.Keys {
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statusMap[k] = api.IPFSPinStatusFromString(v.Type)
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}
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return statusMap, nil
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}
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// PinLsCid performs a "pin ls <hash>" request. It first tries with
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// "type=recursive" and then, if not found, with "type=direct". It returns an
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// api.IPFSPinStatus for that hash.
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func (ipfs *Connector) PinLsCid(ctx context.Context, hash cid.Cid) (api.IPFSPinStatus, error) {
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ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/PinLsCid")
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defer span.End()
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pinLsType := func(pinType string) ([]byte, error) {
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ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
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defer cancel()
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lsPath := fmt.Sprintf("pin/ls?arg=%s&type=%s", hash, pinType)
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return ipfs.postCtx(ctx, lsPath, "", nil)
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}
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var body []byte
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var err error
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// FIXME: Sharding may need to check more pin types here.
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for _, pinType := range []string{"recursive", "direct"} {
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body, err = pinLsType(pinType)
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// Network error, daemon down
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if body == nil && err != nil {
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return api.IPFSPinStatusError, err
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}
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// Pin found. Do not keep looking.
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if err == nil {
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break
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}
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}
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if err != nil { // we could not find the pin
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return api.IPFSPinStatusUnpinned, nil
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}
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var res ipfsPinLsResp
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err = json.Unmarshal(body, &res)
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if err != nil {
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logger.Error("parsing pin/ls?arg=cid response:")
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logger.Error(string(body))
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return api.IPFSPinStatusError, err
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}
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pinObj, ok := res.Keys[hash.String()]
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if !ok {
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return api.IPFSPinStatusError, errors.New("expected to find the pin in the response")
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}
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return api.IPFSPinStatusFromString(pinObj.Type), nil
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}
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func (ipfs *Connector) doPostCtx(ctx context.Context, client *http.Client, apiURL, path string, contentType string, postBody io.Reader) (*http.Response, error) {
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logger.Debugf("posting %s", path)
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urlstr := fmt.Sprintf("%s/%s", apiURL, path)
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req, err := http.NewRequest("POST", urlstr, postBody)
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if err != nil {
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logger.Error("error creating POST request:", err)
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}
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req.Header.Set("Content-Type", contentType)
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req = req.WithContext(ctx)
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res, err := ipfs.client.Do(req)
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if err != nil {
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logger.Error("error posting to IPFS:", err)
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}
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return res, err
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}
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// checkResponse tries to parse an error message on non StatusOK responses
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// from ipfs.
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func checkResponse(path string, code int, body []byte) error {
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if code == http.StatusOK {
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return nil
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}
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var ipfsErr ipfsError
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if body != nil && json.Unmarshal(body, &ipfsErr) == nil {
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return fmt.Errorf("IPFS unsuccessful: %d: %s", code, ipfsErr.Message)
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}
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// No error response with useful message from ipfs
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return fmt.Errorf("IPFS-post '%s' unsuccessful: %d: %s", path, code, body)
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}
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// postCtx makes a POST request against
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// the ipfs daemon, reads the full body of the response and
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// returns it after checking for errors.
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func (ipfs *Connector) postCtx(ctx context.Context, path string, contentType string, postBody io.Reader) ([]byte, error) {
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res, err := ipfs.doPostCtx(ctx, ipfs.client, ipfs.apiURL(), path, contentType, postBody)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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body, err := ioutil.ReadAll(res.Body)
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if err != nil {
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logger.Errorf("error reading response body: %s", err)
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return nil, err
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}
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return body, checkResponse(path, res.StatusCode, body)
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}
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// postDiscardBodyCtx makes a POST requests but discards the body
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// of the response directly after reading it.
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func (ipfs *Connector) postDiscardBodyCtx(ctx context.Context, path string) error {
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res, err := ipfs.doPostCtx(ctx, ipfs.client, ipfs.apiURL(), path, "", nil)
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if err != nil {
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return err
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}
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defer res.Body.Close()
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_, err = io.Copy(ioutil.Discard, res.Body)
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if err != nil {
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return err
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}
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return checkResponse(path, res.StatusCode, nil)
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}
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// apiURL is a short-hand for building the url of the IPFS
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// daemon API.
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func (ipfs *Connector) apiURL() string {
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return fmt.Sprintf("http://%s/api/v0", ipfs.nodeAddr)
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}
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// ConnectSwarms requests the ipfs addresses of other peers and
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// triggers ipfs swarm connect requests
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func (ipfs *Connector) ConnectSwarms(ctx context.Context) error {
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ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/ConnectSwarms")
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defer span.End()
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ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
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defer cancel()
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idsSerial := make([]api.IDSerial, 0)
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err := ipfs.rpcClient.CallContext(
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ctx,
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"",
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"Cluster",
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"Peers",
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struct{}{},
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&idsSerial,
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)
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if err != nil {
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logger.Error(err)
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return err
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}
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logger.Debugf("%+v", idsSerial)
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for _, idSerial := range idsSerial {
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ipfsID := idSerial.IPFS
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for _, addr := range ipfsID.Addresses {
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// This is a best effort attempt
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// We ignore errors which happens
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// when passing in a bunch of addresses
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_, err := ipfs.postCtx(
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ctx,
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fmt.Sprintf("swarm/connect?arg=%s", addr),
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"",
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nil,
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)
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if err != nil {
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logger.Debug(err)
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continue
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}
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logger.Debugf("ipfs successfully connected to %s", addr)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ConfigKey fetches the IPFS daemon configuration and retrieves the value for
|
|
// a given configuration key. For example, "Datastore/StorageMax" will return
|
|
// the value for StorageMax in the Datastore configuration object.
|
|
func (ipfs *Connector) ConfigKey(keypath string) (interface{}, error) {
|
|
ctx, cancel := context.WithTimeout(ipfs.ctx, ipfs.config.IPFSRequestTimeout)
|
|
defer cancel()
|
|
res, err := ipfs.postCtx(ctx, "config/show", "", nil)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
return nil, err
|
|
}
|
|
|
|
var cfg map[string]interface{}
|
|
err = json.Unmarshal(res, &cfg)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
return nil, err
|
|
}
|
|
|
|
path := strings.SplitN(keypath, "/", 2)
|
|
if len(path) == 0 {
|
|
return nil, errors.New("cannot lookup without a path")
|
|
}
|
|
|
|
return getConfigValue(path, cfg)
|
|
}
|
|
|
|
func getConfigValue(path []string, cfg map[string]interface{}) (interface{}, error) {
|
|
value, ok := cfg[path[0]]
|
|
if !ok {
|
|
return nil, errors.New("key not found in configuration")
|
|
}
|
|
|
|
if len(path) == 1 {
|
|
return value, nil
|
|
}
|
|
|
|
switch value.(type) {
|
|
case map[string]interface{}:
|
|
v := value.(map[string]interface{})
|
|
return getConfigValue(path[1:], v)
|
|
default:
|
|
return nil, errors.New("invalid path")
|
|
}
|
|
}
|
|
|
|
// RepoStat returns the DiskUsage and StorageMax repo/stat values from the
|
|
// ipfs daemon, in bytes, wrapped as an IPFSRepoStat object.
|
|
func (ipfs *Connector) RepoStat(ctx context.Context) (api.IPFSRepoStat, error) {
|
|
ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/RepoStat")
|
|
defer span.End()
|
|
|
|
ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
|
|
defer cancel()
|
|
res, err := ipfs.postCtx(ctx, "repo/stat?size-only=true", "", nil)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
return api.IPFSRepoStat{}, err
|
|
}
|
|
|
|
var stats api.IPFSRepoStat
|
|
err = json.Unmarshal(res, &stats)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
return stats, err
|
|
}
|
|
return stats, nil
|
|
}
|
|
|
|
// SwarmPeers returns the peers currently connected to this ipfs daemon.
|
|
func (ipfs *Connector) SwarmPeers(ctx context.Context) (api.SwarmPeers, error) {
|
|
ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/SwarmPeers")
|
|
defer span.End()
|
|
|
|
ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
|
|
defer cancel()
|
|
swarm := api.SwarmPeers{}
|
|
res, err := ipfs.postCtx(ctx, "swarm/peers", "", nil)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
return swarm, err
|
|
}
|
|
var peersRaw ipfsSwarmPeersResp
|
|
err = json.Unmarshal(res, &peersRaw)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
return swarm, err
|
|
}
|
|
|
|
swarm = make([]peer.ID, len(peersRaw.Peers))
|
|
for i, p := range peersRaw.Peers {
|
|
pID, err := peer.IDB58Decode(p.Peer)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
return swarm, err
|
|
}
|
|
swarm[i] = pID
|
|
}
|
|
return swarm, nil
|
|
}
|
|
|
|
// BlockPut triggers an ipfs block put on the given data, inserting the block
|
|
// into the ipfs daemon's repo.
|
|
func (ipfs *Connector) BlockPut(ctx context.Context, b api.NodeWithMeta) error {
|
|
ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/BlockPut")
|
|
defer span.End()
|
|
|
|
logger.Debugf("putting block to IPFS: %s", b.Cid)
|
|
ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
|
|
defer cancel()
|
|
defer ipfs.updateInformerMetric(ctx)
|
|
|
|
mapDir := files.NewMapDirectory(
|
|
map[string]files.Node{ // IPFS reqs require a wrapping directory
|
|
"": files.NewBytesFile(b.Data),
|
|
},
|
|
)
|
|
|
|
multiFileR := files.NewMultiFileReader(mapDir, true)
|
|
if b.Format == "" {
|
|
b.Format = "v0"
|
|
}
|
|
url := "block/put?f=" + b.Format
|
|
contentType := "multipart/form-data; boundary=" + multiFileR.Boundary()
|
|
|
|
_, err := ipfs.postCtx(ctx, url, contentType, multiFileR)
|
|
return err
|
|
}
|
|
|
|
// BlockGet retrieves an ipfs block with the given cid
|
|
func (ipfs *Connector) BlockGet(ctx context.Context, c cid.Cid) ([]byte, error) {
|
|
ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/BlockGet")
|
|
defer span.End()
|
|
|
|
ctx, cancel := context.WithTimeout(ctx, ipfs.config.IPFSRequestTimeout)
|
|
defer cancel()
|
|
url := "block/get?arg=" + c.String()
|
|
return ipfs.postCtx(ctx, url, "", nil)
|
|
}
|
|
|
|
// Returns true every updateMetricsMod-th time that we
|
|
// call this function.
|
|
func (ipfs *Connector) shouldUpdateMetric() bool {
|
|
ipfs.updateMetricMutex.Lock()
|
|
defer ipfs.updateMetricMutex.Unlock()
|
|
ipfs.updateMetricCount++
|
|
if ipfs.updateMetricCount%updateMetricMod == 0 {
|
|
ipfs.updateMetricCount = 0
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Trigger a broadcast of the local informer metrics.
|
|
func (ipfs *Connector) updateInformerMetric(ctx context.Context) error {
|
|
ctx, span := trace.StartSpan(ctx, "ipfsconn/ipfshttp/updateInformerMetric")
|
|
defer span.End()
|
|
|
|
if !ipfs.shouldUpdateMetric() {
|
|
return nil
|
|
}
|
|
|
|
var metric api.Metric
|
|
|
|
err := ipfs.rpcClient.GoContext(
|
|
ctx,
|
|
"",
|
|
"Cluster",
|
|
"SendInformerMetric",
|
|
struct{}{},
|
|
&metric,
|
|
nil,
|
|
)
|
|
if err != nil {
|
|
logger.Error(err)
|
|
}
|
|
return err
|
|
}
|