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client_resources.go
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/
client_resources.go
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package client
import (
"encoding/json"
"errors"
"fmt"
"time"
"github.com/companyzero/bisonrelay/client/clientdb"
"github.com/companyzero/bisonrelay/client/clientintf"
"github.com/companyzero/bisonrelay/client/resources"
"github.com/companyzero/bisonrelay/internal/strescape"
"github.com/companyzero/bisonrelay/rpc"
"github.com/davecgh/go-spew/spew"
"github.com/decred/slog"
)
func (c *Client) NewPagesSession() (clientintf.PagesSessionID, error) {
var id clientintf.PagesSessionID
err := c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
var err error
id, err = c.db.NewPagesSession(tx)
return err
})
c.log.Debugf("Starting new session %d", id)
return id, err
}
// FetchLocalResource fetches the local resource and triggers a correspoding
// ResourceFetched call.
func (c *Client) FetchLocalResource(path []string, meta map[string]string, data json.RawMessage) error {
if c.cfg.ResourcesProvider == nil {
return fmt.Errorf("resources provider not configured")
}
rm := rpc.RMFetchResource{
Path: path,
Meta: meta,
Data: data,
}
reqTS := time.Now()
res, err := c.cfg.ResourcesProvider.Fulfill(c.ctx, c.PublicID(), &rm)
if errors.Is(err, resources.ErrProviderNotFound) {
return fmt.Errorf("Provider not found for local request path %s",
strescape.ResourcesPath(path))
} else if err != nil {
return err
}
fr := clientdb.FetchedResource{
UID: c.PublicID(),
SessionID: 0,
ParentPage: 0,
PageID: 0,
RequestTS: reqTS,
ResponseTS: time.Now(),
Request: rm,
Response: *res,
}
var overv clientdb.PageSessionOverview
c.ntfns.notifyResourceFetched(nil, fr, overv)
return nil
}
// FetchResource requests the specified resource from the client. Once the
// resource is returned the ResourceFetched handler will be called with
// the response using the returned tag.
func (c *Client) FetchResource(uid UserID, path []string, meta map[string]string,
sess, parentPage clientintf.PagesSessionID, data json.RawMessage) (rpc.ResourceTag, error) {
ru, err := c.UserByID(uid)
if err != nil {
return 0, err
}
rm := rpc.RMFetchResource{
Path: path,
Meta: meta,
Data: data,
}
err = c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
return c.db.StoreResourceRequest(tx, uid, sess, parentPage, &rm)
})
if err != nil {
return 0, err
}
if ru.log.Level() < slog.LevelInfo {
ru.log.Debugf("Requesting resource tag %s path %s meta %s",
rm.Tag, strescape.ResourcesPath(path), spew.Sdump(meta))
} else {
ru.log.Infof("Requesting resource tag %s path %s",
rm.Tag, strescape.ResourcesPath(path))
}
payEvent := "fetchresource." + strescape.ResourcesPath(path)
err = c.sendWithSendQ(payEvent, rm, uid)
if err != nil {
return 0, err
}
return rm.Tag, err
}
// handleFetchResource handles receiving a request to send a resource to the
// remote client.
func (c *Client) handleFetchResource(ru *RemoteUser, fr rpc.RMFetchResource) error {
// TODO: support chunked data request.
if fr.Index != 0 || fr.Count != 0 {
return fmt.Errorf("chunked request not implemented")
}
if c.cfg.ResourcesProvider == nil {
return fmt.Errorf("resources provider not configured")
}
if ru.log.Level() < slog.LevelInfo {
ru.log.Debugf("Fullfilling request %d/%d tag %s for resource %s data %d meta %s",
fr.Index, fr.Count, fr.Tag, strescape.ResourcesPath(fr.Path),
len(fr.Data), spew.Sdump(fr.Meta))
} else {
ru.log.Infof("Fullfilling request %d/%d tag %s for resource %s data %d",
fr.Index, fr.Count, fr.Tag, strescape.ResourcesPath(fr.Path),
len(fr.Data))
}
res, err := c.cfg.ResourcesProvider.Fulfill(c.ctx, ru.ID(), &fr)
if errors.Is(err, resources.ErrProviderNotFound) {
ru.log.Infof("Provider not found for request tag %s path %s",
fr.Tag, strescape.ResourcesPath(fr.Path))
return nil
} else if err != nil {
return err
}
res.Tag = fr.Tag // Ensure response tag is same as request tag
if len(res.Data) > rpc.MaxChunkSize {
return fmt.Errorf("resource %s returned more data (%d) than "+
"max chunk size %d", strescape.ResourcesPath(fr.Path),
len(res.Data), rpc.MaxChunkSize)
}
ru.log.Debugf("Fulfilled request tag %s with status %s chunk %d/%d len %d",
res.Tag, res.Status, res.Index, res.Count, len(res.Data))
payEvent := "resource." + strescape.ResourcesPath(fr.Path)
return c.sendWithSendQ(payEvent, *res, ru.ID())
}
// handleFetchResourceReply handles the reply to a requested resource.
func (c *Client) handleFetchResourceReply(ru *RemoteUser, frr rpc.RMFetchResourceReply) error {
// TODO: support chunked response.
if frr.Index != frr.Count || frr.Index != 0 {
return fmt.Errorf("chunked resource reply not implemented")
}
var req rpc.RMFetchResource
var fr clientdb.FetchedResource
var sess clientdb.PageSessionOverview
err := c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
var err error
fr, sess, err = c.db.StoreFetchedResource(tx, ru.ID(), frr.Tag, frr)
return err
})
if err != nil {
return err
}
ru.log.Infof("Received resource reply %d tag %s path %s chunk %d/%d %d bytes",
frr.Status, frr.Tag, strescape.ResourcesPath(req.Path),
frr.Index, frr.Count, len(frr.Data))
c.ntfns.notifyResourceFetched(ru, fr, sess)
return nil
}