| // Copyright 2016 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package bigquery |
| |
| import ( |
| "encoding/base64" |
| "errors" |
| "fmt" |
| "reflect" |
| "time" |
| |
| "cloud.google.com/go/internal/fields" |
| |
| bq "google.golang.org/api/bigquery/v2" |
| ) |
| |
| // See https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#timestamp-type. |
| var timestampFormat = "2006-01-02 15:04:05.999999-07:00" |
| |
| var fieldCache = fields.NewCache(nil) |
| |
| var ( |
| int64ParamType = &bq.QueryParameterType{Type: "INT64"} |
| float64ParamType = &bq.QueryParameterType{Type: "FLOAT64"} |
| boolParamType = &bq.QueryParameterType{Type: "BOOL"} |
| stringParamType = &bq.QueryParameterType{Type: "STRING"} |
| bytesParamType = &bq.QueryParameterType{Type: "BYTES"} |
| timestampParamType = &bq.QueryParameterType{Type: "TIMESTAMP"} |
| ) |
| |
| var timeType = reflect.TypeOf(time.Time{}) |
| |
| func paramType(t reflect.Type) (*bq.QueryParameterType, error) { |
| if t == nil { |
| return nil, errors.New("bigquery: nil parameter") |
| } |
| if t == timeType { |
| return timestampParamType, nil |
| } |
| switch t.Kind() { |
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint8, reflect.Uint16, reflect.Uint32: |
| return int64ParamType, nil |
| |
| case reflect.Float32, reflect.Float64: |
| return float64ParamType, nil |
| |
| case reflect.Bool: |
| return boolParamType, nil |
| |
| case reflect.String: |
| return stringParamType, nil |
| |
| case reflect.Slice: |
| if t.Elem().Kind() == reflect.Uint8 { |
| return bytesParamType, nil |
| } |
| fallthrough |
| |
| case reflect.Array: |
| et, err := paramType(t.Elem()) |
| if err != nil { |
| return nil, err |
| } |
| return &bq.QueryParameterType{Type: "ARRAY", ArrayType: et}, nil |
| |
| case reflect.Ptr: |
| if t.Elem().Kind() != reflect.Struct { |
| break |
| } |
| t = t.Elem() |
| fallthrough |
| |
| case reflect.Struct: |
| var fts []*bq.QueryParameterTypeStructTypes |
| for _, f := range fieldCache.Fields(t) { |
| pt, err := paramType(f.Type) |
| if err != nil { |
| return nil, err |
| } |
| fts = append(fts, &bq.QueryParameterTypeStructTypes{ |
| Name: f.Name, |
| Type: pt, |
| }) |
| } |
| return &bq.QueryParameterType{Type: "STRUCT", StructTypes: fts}, nil |
| } |
| return nil, fmt.Errorf("bigquery: Go type %s cannot be represented as a parameter type", t) |
| } |
| |
| func paramValue(v reflect.Value) (bq.QueryParameterValue, error) { |
| var res bq.QueryParameterValue |
| if !v.IsValid() { |
| return res, errors.New("bigquery: nil parameter") |
| } |
| t := v.Type() |
| if t == timeType { |
| res.Value = v.Interface().(time.Time).Format(timestampFormat) |
| return res, nil |
| } |
| switch t.Kind() { |
| case reflect.Slice: |
| if t.Elem().Kind() == reflect.Uint8 { |
| res.Value = base64.StdEncoding.EncodeToString(v.Interface().([]byte)) |
| return res, nil |
| } |
| fallthrough |
| |
| case reflect.Array: |
| var vals []*bq.QueryParameterValue |
| for i := 0; i < v.Len(); i++ { |
| val, err := paramValue(v.Index(i)) |
| if err != nil { |
| return bq.QueryParameterValue{}, err |
| } |
| vals = append(vals, &val) |
| } |
| return bq.QueryParameterValue{ArrayValues: vals}, nil |
| |
| case reflect.Ptr: |
| if t.Elem().Kind() != reflect.Struct { |
| return res, fmt.Errorf("bigquery: Go type %s cannot be represented as a parameter value", t) |
| } |
| t = t.Elem() |
| v = v.Elem() |
| if !v.IsValid() { |
| // nil pointer becomes empty value |
| return res, nil |
| } |
| fallthrough |
| |
| case reflect.Struct: |
| fields := fieldCache.Fields(t) |
| res.StructValues = map[string]bq.QueryParameterValue{} |
| for _, f := range fields { |
| fv := v.FieldByIndex(f.Index) |
| fp, err := paramValue(fv) |
| if err != nil { |
| return bq.QueryParameterValue{}, err |
| } |
| res.StructValues[f.Name] = fp |
| } |
| return res, nil |
| } |
| // None of the above: assume a scalar type. (If it's not a valid type, |
| // paramType will catch the error.) |
| res.Value = fmt.Sprint(v.Interface()) |
| return res, nil |
| } |