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bucket_viewquery.go
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bucket_viewquery.go
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package gocb
import (
"encoding/json"
"net/url"
"strings"
"time"
gocbcore "github.com/couchbase/gocbcore/v8"
"github.com/pkg/errors"
)
type jsonViewResponse struct {
TotalRows uint64 `json:"total_rows,omitempty"`
DebugInfo interface{} `json:"debug_info,omitempty"`
}
type jsonViewRow struct {
ID string `json:"id"`
Key json.RawMessage `json:"key"`
Value json.RawMessage `json:"value"`
}
// ViewMetaData provides access to the meta-data properties of a view query result.
type ViewMetaData struct {
TotalRows uint64
Debug interface{}
}
func (meta *ViewMetaData) fromData(data jsonViewResponse) error {
meta.TotalRows = data.TotalRows
meta.Debug = data.DebugInfo
return nil
}
// ViewRow represents a single row returned from a view query.
type ViewRow struct {
ID string
keyBytes []byte
valueBytes []byte
}
// Key returns the key associated with this view row.
func (vr *ViewRow) Key(valuePtr interface{}) error {
return json.Unmarshal(vr.keyBytes, valuePtr)
}
// Value returns the value associated with this view row.
func (vr *ViewRow) Value(valuePtr interface{}) error {
return json.Unmarshal(vr.valueBytes, valuePtr)
}
// ViewResult implements an iterator interface which can be used to iterate over the rows of the query results.
type ViewResult struct {
reader *gocbcore.ViewQueryRowReader
currentRow ViewRow
}
func newViewResult(reader *gocbcore.ViewQueryRowReader) (*ViewResult, error) {
return &ViewResult{
reader: reader,
}, nil
}
// Next assigns the next result from the results into the value pointer, returning whether the read was successful.
func (r *ViewResult) Next() bool {
rowBytes := r.reader.NextRow()
if rowBytes == nil {
return false
}
r.currentRow = ViewRow{}
var rowData jsonViewRow
if err := json.Unmarshal(rowBytes, &rowData); err == nil {
r.currentRow.ID = rowData.ID
r.currentRow.keyBytes = rowData.Key
r.currentRow.valueBytes = rowData.Value
}
return true
}
// Row returns the contents of the current row.
func (r *ViewResult) Row() ViewRow {
return r.currentRow
}
// Err returns any errors that have occurred on the stream
func (r *ViewResult) Err() error {
return r.reader.Err()
}
// Close marks the results as closed, returning any errors that occurred during reading the results.
func (r *ViewResult) Close() error {
return r.reader.Close()
}
// MetaData returns any meta-data that was available from this query. Note that
// the meta-data will only be available once the object has been closed (either
// implicitly or explicitly).
func (r *ViewResult) MetaData() (*ViewMetaData, error) {
metaDataBytes, err := r.reader.MetaData()
if err != nil {
return nil, err
}
var jsonResp jsonViewResponse
err = json.Unmarshal(metaDataBytes, &jsonResp)
if err != nil {
return nil, err
}
var metaData ViewMetaData
err = metaData.fromData(jsonResp)
if err != nil {
return nil, err
}
return &metaData, nil
}
// ViewQuery performs a view query and returns a list of rows or an error.
func (b *Bucket) ViewQuery(designDoc string, viewName string, opts *ViewOptions) (*ViewResult, error) {
if opts == nil {
opts = &ViewOptions{}
}
span := b.sb.Tracer.StartSpan("ViewQuery", opts.parentSpan).
SetTag("couchbase.service", "view")
defer span.Finish()
designDoc = b.maybePrefixDevDocument(opts.Namespace, designDoc)
timeout := b.sb.ViewTimeout
if opts.Timeout != 0 && opts.Timeout < timeout {
timeout = opts.Timeout
}
deadline := time.Now().Add(timeout)
retryWrapper := b.sb.RetryStrategyWrapper
if opts.RetryStrategy != nil {
retryWrapper = newRetryStrategyWrapper(opts.RetryStrategy)
}
urlValues, err := opts.toURLValues()
if err != nil {
return nil, errors.Wrap(err, "could not parse query options")
}
return b.execViewQuery(span.Context(), "_view", designDoc, viewName, *urlValues, deadline, retryWrapper)
}
func (b *Bucket) execViewQuery(
span requestSpanContext,
viewType, ddoc, viewName string,
options url.Values,
deadline time.Time,
wrapper *retryStrategyWrapper,
) (*ViewResult, error) {
cli := b.sb.getCachedClient()
provider, err := cli.getViewProvider()
if err != nil {
return nil, ViewError{
InnerError: wrapError(err, "failed to get query provider"),
DesignDocumentName: ddoc,
ViewName: viewName,
}
}
res, err := provider.ViewQuery(gocbcore.ViewQueryOptions{
DesignDocumentName: ddoc,
ViewType: viewType,
ViewName: viewName,
Options: options,
RetryStrategy: wrapper,
Deadline: deadline,
})
if err != nil {
return nil, maybeEnhanceViewError(err)
}
return newViewResult(res)
}
func (b *Bucket) maybePrefixDevDocument(namespace DesignDocumentNamespace, ddoc string) string {
designDoc := ddoc
if namespace == DesignDocumentNamespaceProduction {
designDoc = strings.TrimPrefix(ddoc, "dev_")
} else {
if !strings.HasPrefix(ddoc, "dev_") {
designDoc = "dev_" + ddoc
}
}
return designDoc
}