mirror of https://github.com/perkeep/perkeep.git
126 lines
3.2 KiB
Go
126 lines
3.2 KiB
Go
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package client
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import (
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"camli/blobref"
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"fmt"
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"http"
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"os"
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)
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type EnumerateOpts struct {
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After string
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MaxWaitSec int // max seconds to long poll for, waiting for any blob
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}
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// Note: closes ch.
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func (c *Client) EnumerateBlobs(ch chan *blobref.SizedBlobRef) os.Error {
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return c.EnumerateBlobsOpts(ch, EnumerateOpts{})
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}
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const enumerateBatchSize = 10
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// Note: closes ch.
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func (c *Client) EnumerateBlobsOpts(ch chan *blobref.SizedBlobRef, opts EnumerateOpts) os.Error {
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defer close(ch)
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if opts.After != "" && opts.MaxWaitSec != 0 {
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return os.NewError("client error: it's invalid to use enumerate After and MaxWaitSec together")
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}
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error := func(msg string, e os.Error) os.Error {
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err := os.NewError(fmt.Sprintf("client enumerate error: %s: %v", msg, e))
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c.log.Print(err.String())
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return err
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}
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keepGoing := true
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after := opts.After
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for keepGoing {
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waitSec := 0
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if after == "" {
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waitSec = opts.MaxWaitSec
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}
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url := fmt.Sprintf("%s/camli/enumerate-blobs?after=%s&limit=%d&maxwaitsec=%d",
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c.server, http.URLEscape(after), enumerateBatchSize, waitSec)
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req := c.newRequest("GET", url)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return error("http request", err)
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}
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json, err := c.jsonFromResponse(resp)
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if err != nil {
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return error("stat json parse error", err)
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}
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blobs, ok := getJsonMapArray(json, "blobs")
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if !ok {
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return error("response JSON didn't contain 'blobs' array", nil)
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}
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for _, v := range blobs {
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itemJson, ok := v.(map[string]interface{})
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if !ok {
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return error("item in 'blobs' was malformed", nil)
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}
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blobrefStr, ok := getJsonMapString(itemJson, "blobRef")
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if !ok {
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return error("item in 'blobs' was missing string 'blobRef'", nil)
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}
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size, ok := getJsonMapInt64(itemJson, "size")
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if !ok {
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return error("item in 'blobs' was missing numeric 'size'", nil)
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}
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br := blobref.Parse(blobrefStr)
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if br == nil {
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return error("item in 'blobs' had invalid blobref.", nil)
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}
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ch <- &blobref.SizedBlobRef{BlobRef: br, Size: size}
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}
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after, keepGoing = getJsonMapString(json, "continueAfter")
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}
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return nil
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}
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func getJsonMapString(m map[string]interface{}, key string) (string, bool) {
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if v, ok := m[key]; ok {
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if s, ok := v.(string); ok {
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return s, true
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}
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}
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return "", false
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}
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func getJsonMapInt64(m map[string]interface{}, key string) (int64, bool) {
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if v, ok := m[key]; ok {
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if n, ok := v.(float64); ok {
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return int64(n), true
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}
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}
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return 0, false
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}
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func getJsonMapArray(m map[string]interface{}, key string) ([]interface{}, bool) {
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if v, ok := m[key]; ok {
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if a, ok := v.([]interface{}); ok {
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return a, true
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}
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}
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return nil, false
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}
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