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find.go
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find.go
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package couchdb
import (
"bytes"
"context"
"encoding/json"
"fmt"
"github.com/flimzy/kivik"
"github.com/flimzy/kivik/driver"
"github.com/flimzy/kivik/driver/util"
"github.com/flimzy/kivik/errors"
"github.com/go-kivik/couchdb/chttp"
)
// deJSONify unmarshals a string, []byte, or json.RawMessage. All other types
// are returned as-is.
func deJSONify(i interface{}) (interface{}, error) {
var data []byte
switch t := i.(type) {
case string:
data = []byte(t)
case []byte:
data = t
case json.RawMessage:
data = []byte(t)
default:
return i, nil
}
var x interface{}
err := json.Unmarshal(data, &x)
return x, errors.WrapStatus(kivik.StatusBadRequest, err)
}
var findNotImplemented = errors.Status(kivik.StatusNotImplemented, "kivik: Find interface not implemented prior to CouchDB 2.0.0")
func (d *db) CreateIndex(ctx context.Context, ddoc, name string, index interface{}) error {
if d.client.Compat == CompatCouch16 {
return findNotImplemented
}
indexObj, err := deJSONify(index)
if err != nil {
return err
}
parameters := struct {
Index interface{} `json:"index"`
Ddoc string `json:"ddoc,omitempty"`
Name string `json:"name,omitempty"`
}{
Index: indexObj,
Ddoc: ddoc,
Name: name,
}
body := &bytes.Buffer{}
if err = json.NewEncoder(body).Encode(parameters); err != nil {
return errors.WrapStatus(kivik.StatusBadRequest, err)
}
_, err = d.Client.DoError(ctx, kivik.MethodPost, d.path("_index", nil), &chttp.Options{Body: body})
return err
}
func (d *db) GetIndexes(ctx context.Context) ([]driver.Index, error) {
if d.client.Compat == CompatCouch16 {
return nil, findNotImplemented
}
var result struct {
Indexes []driver.Index `json:"indexes"`
}
_, err := d.Client.DoJSON(ctx, kivik.MethodGet, d.path("_index", nil), nil, &result)
return result.Indexes, err
}
func (d *db) DeleteIndex(ctx context.Context, ddoc, name string) error {
path := fmt.Sprintf("_index/%s/json/%s", ddoc, name)
_, err := d.Client.DoError(ctx, kivik.MethodDelete, d.path(path, nil), nil)
return err
}
func (d *db) Find(ctx context.Context, query interface{}) (driver.Rows, error) {
if d.client.Compat == CompatCouch16 {
return nil, findNotImplemented
}
body, err := util.ToJSON(query)
if err != nil {
return nil, err
}
resp, err := d.Client.DoReq(ctx, kivik.MethodPost, d.path("_find", nil), &chttp.Options{Body: body})
if err != nil {
return nil, err
}
if err = chttp.ResponseError(resp); err != nil {
return nil, err
}
return newRows(resp.Body), nil
}
type queryPlan struct {
DBName string `json:"dbname"`
Index map[string]interface{} `json:"index"`
Selector map[string]interface{} `json:"selector"`
Options map[string]interface{} `json:"opts"`
Limit int64 `json:"limit"`
Skip int64 `json:"skip"`
Fields fields `json:"fields"`
Range map[string]interface{} `json:"range"`
}
type fields []interface{}
func (f *fields) UnmarshalJSON(data []byte) error {
if string(data) == `"all_fields"` {
return nil
}
var i []interface{}
if err := json.Unmarshal(data, &i); err != nil {
return err
}
newFields := make([]interface{}, len(i))
copy(newFields, i)
*f = newFields
return nil
}
func (d *db) Explain(ctx context.Context, query interface{}) (*driver.QueryPlan, error) {
if d.client.Compat == CompatCouch16 {
return nil, findNotImplemented
}
body, err := util.ToJSON(query)
if err != nil {
return nil, err
}
var plan queryPlan
_, err = d.Client.DoJSON(ctx, kivik.MethodPost, d.path("_explain", nil), &chttp.Options{Body: body}, &plan)
if err != nil {
return nil, err
}
return &driver.QueryPlan{
DBName: plan.DBName,
Index: plan.Index,
Selector: plan.Selector,
Options: plan.Options,
Limit: plan.Limit,
Skip: plan.Skip,
Fields: plan.Fields,
Range: plan.Range,
}, nil
}