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113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
// Copyright 2022 Molecula Corp. (DBA FeatureBase).
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// SPDX-License-Identifier: Apache-2.0
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package pgtest
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"github.com/featurebasedb/featurebase/v3/pg"
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)
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// HandlerFunc implements a postgres query handler with a function.
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type HandlerFunc func(context.Context, pg.QueryResultWriter, pg.Query) error
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// HandleQuery calls the user's query handler function.
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func (h HandlerFunc) HandleQuery(ctx context.Context, w pg.QueryResultWriter, q pg.Query) error {
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return h(ctx, w, q)
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}
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func (h HandlerFunc) HandleSchema(ctx context.Context, portal *pg.Portal) error {
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return nil
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}
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func (h HandlerFunc) Version() string {
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return "testv1"
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}
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var _ pg.QueryHandler = HandlerFunc(nil)
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// ResultSet is a QueryResultWriter that accumulates results in a slice.
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type ResultSet struct {
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Columns []pg.ColumnInfo
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Data [][]string
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ResultTag string
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}
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func (s ResultSet) String() string {
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if len(s.Columns) == 0 || len(s.Data) == 0 {
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return "EMPTY"
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}
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colHdr := make([]string, len(s.Columns))
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for i, c := range s.Columns {
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colHdr[i] = fmt.Sprintf("%s:%v", c.Name, c.Type)
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}
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dataBody := make([][]string, len(s.Data))
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for i, v := range s.Data {
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dataBody[i] = append([]string(nil), v...)
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}
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colWidth := make([]int, len(s.Columns))
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for i, c := range colHdr {
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colWidth[i] = len(c)
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}
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for _, row := range dataBody {
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for i, c := range row {
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if len(c) > colWidth[i] {
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colWidth[i] = len(c)
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}
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}
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}
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for i, c := range colHdr {
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c += strings.Repeat(" ", colWidth[i]-len(c))
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colHdr[i] = c
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}
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for _, row := range dataBody {
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for i, c := range row {
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c += strings.Repeat(" ", colWidth[i]-len(c))
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row[i] = c
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}
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}
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var totalWidth int
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for _, width := range colWidth {
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totalWidth += width
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}
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data := make([]string, len(dataBody))
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for i, row := range dataBody {
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data[i] = strings.Join(row, "|")
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}
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return strings.Join(colHdr, "|") + "\n" + strings.Repeat("-", totalWidth+(2*len(colHdr)-1)) + "\n" + strings.Join(data, "\n")
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}
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// WriteHeader writes headers to the result set.
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func (rs *ResultSet) WriteHeader(cols ...pg.ColumnInfo) error {
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if rs.Columns != nil {
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return errors.New("double-write of headers")
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}
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colsCopy := make([]pg.ColumnInfo, len(cols))
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copy(colsCopy, cols)
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rs.Columns = colsCopy
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return nil
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}
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// WriteRowText writes a row to the result set.
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func (rs *ResultSet) WriteRowText(vals ...string) error {
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if rs.Columns == nil {
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return errors.New("wrote a row without headers")
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}
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row := make([]string, len(vals))
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copy(row, vals)
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rs.Data = append(rs.Data, row)
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return nil
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}
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// Tag applies a tag to the result set.
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func (rs *ResultSet) Tag(tag string) {
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rs.ResultTag = tag
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}
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var _ pg.QueryResultWriter = (*ResultSet)(nil)
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