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package physical | ||
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import ( | ||
"bytes" | ||
"encoding/json" | ||
"fmt" | ||
"io/ioutil" | ||
"net/http" | ||
"net/url" | ||
"os" | ||
"strings" | ||
"time" | ||
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"github.com/armon/go-metrics" | ||
cleanhttp "github.com/hashicorp/go-cleanhttp" | ||
log "github.com/mgutz/logxi/v1" | ||
) | ||
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// CouchDBBackend allows the management of couchdb users | ||
type CouchDBBackend struct { | ||
logger log.Logger | ||
client *couchDBClient | ||
permitPool *PermitPool | ||
} | ||
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type couchDBClient struct { | ||
endpoint string | ||
username string | ||
password string | ||
*http.Client | ||
} | ||
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type couchDBListItem struct { | ||
ID string `json:"id"` | ||
Key string `json:"key"` | ||
Value struct { | ||
Revision string | ||
} `json:"value"` | ||
} | ||
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type couchDBList struct { | ||
TotalRows int `json:"total_rows"` | ||
Offset int `json:"offset"` | ||
Rows []couchDBListItem `json:"rows"` | ||
} | ||
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func (m *couchDBClient) rev(key string) (string, error) { | ||
req, err := http.NewRequest("HEAD", fmt.Sprintf("%s/%s", m.endpoint, key), nil) | ||
if err != nil { | ||
return "", err | ||
} | ||
req.SetBasicAuth(m.username, m.password) | ||
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resp, err := m.Client.Do(req) | ||
if err != nil { | ||
return "", err | ||
} | ||
resp.Body.Close() | ||
if resp.StatusCode != http.StatusOK { | ||
return "", nil | ||
} | ||
etag := resp.Header.Get("Etag") | ||
if len(etag) < 2 { | ||
return "", nil | ||
} | ||
return etag[1 : len(etag)-1], nil | ||
} | ||
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func (m *couchDBClient) put(e couchDBEntry) error { | ||
bs, err := json.Marshal(e) | ||
if err != nil { | ||
return err | ||
} | ||
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req, err := http.NewRequest("PUT", fmt.Sprintf("%s/%s", m.endpoint, e.ID), bytes.NewReader(bs)) | ||
if err != nil { | ||
return err | ||
} | ||
req.SetBasicAuth(m.username, m.password) | ||
_, err = m.Client.Do(req) | ||
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return err | ||
} | ||
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func (m *couchDBClient) get(key string) (*Entry, error) { | ||
req, err := http.NewRequest("GET", fmt.Sprintf("%s/%s", m.endpoint, url.PathEscape(key)), nil) | ||
if err != nil { | ||
return nil, err | ||
} | ||
req.SetBasicAuth(m.username, m.password) | ||
resp, err := m.Client.Do(req) | ||
if err != nil { | ||
return nil, err | ||
} | ||
defer resp.Body.Close() | ||
if resp.StatusCode == http.StatusNotFound { | ||
return nil, nil | ||
} else if resp.StatusCode != http.StatusOK { | ||
return nil, fmt.Errorf("GET returned %s", resp.Status) | ||
} | ||
bs, err := ioutil.ReadAll(resp.Body) | ||
if err != nil { | ||
return nil, err | ||
} | ||
entry := couchDBEntry{} | ||
if err := json.Unmarshal(bs, &entry); err != nil { | ||
return nil, err | ||
} | ||
return entry.Entry, nil | ||
} | ||
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func (m *couchDBClient) list(prefix string) ([]couchDBListItem, error) { | ||
req, _ := http.NewRequest("GET", fmt.Sprintf("%s/_all_docs", m.endpoint), nil) | ||
req.SetBasicAuth(m.username, m.password) | ||
values := req.URL.Query() | ||
values.Set("skip", "0") | ||
values.Set("limit", "100") | ||
values.Set("include_docs", "false") | ||
if prefix != "" { | ||
values.Set("startkey", fmt.Sprintf("%q", prefix)) | ||
values.Set("endkey", fmt.Sprintf("%q", prefix+"{}")) | ||
} | ||
req.URL.RawQuery = values.Encode() | ||
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resp, err := m.Client.Do(req) | ||
if err != nil { | ||
return nil, err | ||
} | ||
defer resp.Body.Close() | ||
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data, err := ioutil.ReadAll(resp.Body) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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results := couchDBList{} | ||
if err := json.Unmarshal(data, &results); err != nil { | ||
return nil, err | ||
} | ||
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return results.Rows, nil | ||
} | ||
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func buildCouchDBBackend(conf map[string]string, logger log.Logger) (*CouchDBBackend, error) { | ||
endpoint := os.Getenv("COUCHDB_ENDPOINT") | ||
if endpoint == "" { | ||
endpoint = conf["endpoint"] | ||
} | ||
if endpoint == "" { | ||
return nil, fmt.Errorf("missing endpoint") | ||
} | ||
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username := os.Getenv("COUCHDB_USERNAME") | ||
if username == "" { | ||
username = conf["username"] | ||
} | ||
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password := os.Getenv("COUCHDB_PASSWORD") | ||
if password == "" { | ||
password = conf["password"] | ||
} | ||
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return &CouchDBBackend{ | ||
client: &couchDBClient{ | ||
endpoint: endpoint, | ||
username: username, | ||
password: password, | ||
Client: cleanhttp.DefaultPooledClient(), | ||
}, | ||
logger: logger, | ||
permitPool: NewPermitPool(DefaultParallelOperations), | ||
}, nil | ||
} | ||
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func newCouchDBBackend(conf map[string]string, logger log.Logger) (Backend, error) { | ||
return buildCouchDBBackend(conf, logger) | ||
} | ||
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type couchDBEntry struct { | ||
Entry *Entry `json:"entry"` | ||
Rev string `json:"_rev,omitempty"` | ||
ID string `json:"_id"` | ||
Deleted *bool `json:"_deleted,omitempty"` | ||
} | ||
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// Put is used to insert or update an entry | ||
func (m *CouchDBBackend) Put(entry *Entry) error { | ||
m.permitPool.Acquire() | ||
defer m.permitPool.Release() | ||
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return m.PutInternal(entry) | ||
} | ||
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// Get is used to fetch an entry | ||
func (m *CouchDBBackend) Get(key string) (*Entry, error) { | ||
m.permitPool.Acquire() | ||
defer m.permitPool.Release() | ||
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return m.GetInternal(key) | ||
} | ||
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// Delete is used to permanently delete an entry | ||
func (m *CouchDBBackend) Delete(key string) error { | ||
m.permitPool.Acquire() | ||
defer m.permitPool.Release() | ||
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return m.DeleteInternal(key) | ||
} | ||
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// List is used to list all the keys under a given prefix | ||
func (m *CouchDBBackend) List(prefix string) ([]string, error) { | ||
defer metrics.MeasureSince([]string{"couchdb", "list"}, time.Now()) | ||
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items, err := m.client.list(prefix) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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var out []string | ||
seen := make(map[string]interface{}) | ||
for _, result := range items { | ||
trimmed := strings.TrimPrefix(result.ID, prefix) | ||
sep := strings.Index(trimmed, "/") | ||
if sep == -1 { | ||
out = append(out, trimmed) | ||
} else { | ||
trimmed = trimmed[:sep+1] | ||
if _, ok := seen[trimmed]; !ok { | ||
out = append(out, trimmed) | ||
seen[trimmed] = struct{}{} | ||
} | ||
} | ||
} | ||
return out, nil | ||
} | ||
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// TransactionalCouchDBBackend creates a couchdb backend that forces all operations to happen | ||
// in serial | ||
type TransactionalCouchDBBackend struct { | ||
CouchDBBackend | ||
} | ||
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func newTransactionalCouchDBBackend(conf map[string]string, logger log.Logger) (Backend, error) { | ||
backend, err := buildCouchDBBackend(conf, logger) | ||
if err != nil { | ||
return nil, err | ||
} | ||
backend.permitPool = NewPermitPool(1) | ||
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return &TransactionalCouchDBBackend{ | ||
CouchDBBackend: *backend, | ||
}, nil | ||
} | ||
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// GetInternal is used to fetch an entry | ||
func (m *CouchDBBackend) GetInternal(key string) (*Entry, error) { | ||
defer metrics.MeasureSince([]string{"couchdb", "get"}, time.Now()) | ||
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return m.client.get(key) | ||
} | ||
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// PutInternal is used to insert or update an entry | ||
func (m *CouchDBBackend) PutInternal(entry *Entry) error { | ||
defer metrics.MeasureSince([]string{"couchdb", "put"}, time.Now()) | ||
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revision, _ := m.client.rev(url.PathEscape(entry.Key)) | ||
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return m.client.put(couchDBEntry{ | ||
Entry: entry, | ||
Rev: revision, | ||
ID: url.PathEscape(entry.Key), | ||
}) | ||
} | ||
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// DeleteInternal is used to permanently delete an entry | ||
func (m *CouchDBBackend) DeleteInternal(key string) error { | ||
defer metrics.MeasureSince([]string{"couchdb", "delete"}, time.Now()) | ||
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revision, _ := m.client.rev(url.PathEscape(key)) | ||
deleted := true | ||
return m.client.put(couchDBEntry{ | ||
ID: url.PathEscape(key), | ||
Rev: revision, | ||
Deleted: &deleted, | ||
}) | ||
} |
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