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gen_query.go
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gen_query.go
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package gen
import (
"fmt"
"strings"
"text/template"
"github.com/opendoor/pggen/gen/internal/config"
"github.com/opendoor/pggen/gen/internal/meta"
"github.com/opendoor/pggen/gen/internal/names"
)
func (g *Generator) genQueries(
into *strings.Builder,
queries []config.QueryConfig,
requireComments bool,
) error {
if len(queries) > 0 {
g.log.Infof(" generating %d queries\n", len(queries))
} else {
return nil
}
g.imports[`"database/sql"`] = true
g.imports[`"context"`] = true
g.imports[`"fmt"`] = true
g.imports[`"github.com/opendoor/pggen/unstable"`] = true
// HACK: not really a type, but the type resolver can be used to ensure that
// exactly one copy of this declaration makes it into the final output.
err := g.typeResolver.EmitType("ensure-unstable-used", "sig", "var _ = unstable.NotFoundError{}")
if err != nil {
return fmt.Errorf("internal-error: emitting bogus NotFoundError usage: %s", err)
}
for i, query := range queries {
if requireComments && query.Comment == "" {
return fmt.Errorf("query '%s' is missing a comment but require_query_comments is set", query.Name)
}
err := g.genQuery(into, &queries[i], nil)
if err != nil {
return fmt.Errorf("generating query '%s': %s", query.Name, err.Error())
}
}
return nil
}
// generate a query for the given config. If `args` is provided, use it
// instead of the inferred argument types.
func (g *Generator) genQuery(
into *strings.Builder,
config *config.QueryConfig,
args []meta.Arg,
) error {
g.log.Infof(" generating query '%s'\n", config.Name)
// ensure that the query name is in the right format for go
config.Name = names.PgToGoName(config.Name)
// not needed, but it does make the generated code a little nicer
config.Body = strings.TrimSpace(config.Body)
// tables in non-public schemas are allowed to have underscores in their names, so
// we don't want to convert in that case.
if !g.typeResolver.Probe(config.ReturnType) {
config.ReturnType = names.PgToGoName(config.ReturnType)
}
if config.Body == "" {
return fmt.Errorf("empty query body")
}
meta, err := g.metaResolver.QueryMeta(config, args == nil /* inferArgTypes */)
if err != nil {
return err
}
if args != nil {
meta.Args = args
}
if meta.MultiReturn {
genCtx := buildTableGenCtx(&meta)
err = g.typeResolver.EmitStructType(meta.ReturnTypeName, &genCtx)
if err != nil {
return fmt.Errorf("generating return struct for '%s': %s", config.Name, err.Error())
}
}
return queryShimTmpl.Execute(into, meta)
}
// buildTableGenCtx converts a meta.QueryMeta object into a fake table gen context
// that is good enough to use to generate a return type and scan method.
//
// poison the strings so that mistakes are easier to spot
func buildTableGenCtx(qm *meta.QueryMeta) meta.TableGenCtx {
return meta.TableGenCtx{
PgName: "BOGUS_PGNAME",
GoName: qm.ConfigData.Name + "Row",
PkeyColIdx: -1,
AllIncludeSpec: "BOGUS_ALL_INCLUDE_SPEC",
Meta: &meta.TableMeta{
Info: meta.PgTableInfo{
PgName: "BOGUS_PGNAME-inner",
GoName: qm.ConfigData.Name + "Row",
PluralGoName: "BOGUS_PLURAL_GONAME-inner",
Cols: qm.ReturnCols,
},
},
}
}
var queryShimTmpl = template.Must(template.New("query-shim").Parse(`
{{ if .ConfigData.SingleResult }}
{{ .Comment }}
func (p *PGClient) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
{{- if (not .MultiReturn) }}
) (ret {{ .ReturnTypeName }}, err error) {
{{- else }}
) (ret *{{ .ReturnTypeName }}, err error) {
{{- end }}
return p.impl.{{ .ConfigData.Name }}(
ctx,
{{- range .Args }}
{{ .GoName }},
{{- end }}
)
}
{{ .Comment }}
func (tx *TxPGClient) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
{{- if (not .MultiReturn) }}
) (ret {{ .ReturnTypeName }}, err error) {
{{- else }}
) (ret *{{ .ReturnTypeName }}, err error) {
{{- end }}
return tx.impl.{{ .ConfigData.Name }}(
ctx,
{{- range .Args }}
{{ .GoName }},
{{- end }}
)
}
{{ .Comment }}
func (conn *ConnPGClient) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
{{- if (not .MultiReturn) }}
) (ret {{ .ReturnTypeName }}, err error) {
{{- else }}
) (ret *{{ .ReturnTypeName }}, err error) {
{{- end }}
return conn.impl.{{ .ConfigData.Name }}(
ctx,
{{- range .Args }}
{{ .GoName }},
{{- end }}
)
}
func (p *pgClientImpl) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
{{- if (not .MultiReturn) }}
) (ret {{ .ReturnTypeName }}, err error) {
{{- else }}
) (ret *{{ .ReturnTypeName }}, err error) {
{{- end }}
{{- if (not .MultiReturn) }}
var zero {{ .ReturnTypeName }}
{{- else }}
var zero *{{ .ReturnTypeName }}
{{- end }}
// we still use QueryConfig rather than QueryRowContext so the scan
// impl remains consistant. We don't need to split out a seperate Query
// method though.
var rows *sql.Rows
{{- /* We can't call out to *Query method because this is in the SingleResult block. */}}
rows, err = p.queryContext(
ctx,
` + "`" +
`{{ .ConfigData.Body }}` +
"`" + `,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ call .TypeInfo.NullSqlArgument .GoName }},
{{- else }}
{{ call .TypeInfo.SqlArgument .GoName }},
{{- end }}
{{- end }}
)
if err != nil {
return zero, p.client.errorConverter(err)
}
defer func() {
if err == nil {
err = rows.Close()
if err != nil {
ret = zero
err = p.client.errorConverter(err)
}
} else {
rowErr := rows.Close()
if rowErr != nil {
err = p.client.errorConverter(fmt.Errorf("%s AND %s", err.Error(), rowErr.Error()))
}
}
}()
if !rows.Next() {
return zero, p.client.errorConverter(&unstable.NotFoundError{ Msg: "{{ .ConfigData.Name }}: no results" })
}
{{- if .MultiReturn }}
ret = &{{ .ReturnTypeName }}{}
err = ret.Scan(ctx, p.client, rows)
{{- else }}
{{- if (index .ReturnCols 0).Nullable }}
var scanTgt {{ (index .ReturnCols 0).TypeInfo.ScanNullName }}
err = rows.Scan({{ call (index .ReturnCols 0).TypeInfo.NullSqlReceiver "scanTgt" }})
if err != nil {
return zero, p.client.errorConverter(err)
}
ret = {{ call (index .ReturnCols 0).TypeInfo.NullConvertFunc "scanTgt" }}
{{- else }}
err = rows.Scan({{ call (index .ReturnCols 0).TypeInfo.SqlReceiver "ret" }})
if err != nil {
return zero, p.client.errorConverter(err)
}
{{- end }}
{{- end }}
return
}
{{- else }}{{/* if .ConfigData.SingleResult */}}
{{ .Comment }}
func (p *PGClient) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (ret []{{- if $.ConfigData.BoxResults }}*{{- end }}{{ .ReturnTypeName }}, err error) {
return p.impl.{{ .ConfigData.Name }}(
ctx,
{{- range .Args }}
{{ .GoName }},
{{- end }}
)
}
{{ .Comment }}
func (tx *TxPGClient) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (ret []{{- if $.ConfigData.BoxResults }}*{{- end }}{{ .ReturnTypeName }}, err error) {
return tx.impl.{{ .ConfigData.Name }}(
ctx,
{{- range .Args }}
{{ .GoName }},
{{- end }}
)
}
{{ .Comment }}
func (conn *ConnPGClient) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (ret []{{- if $.ConfigData.BoxResults }}*{{- end }}{{ .ReturnTypeName }}, err error) {
return conn.impl.{{ .ConfigData.Name }}(
ctx,
{{- range .Args }}
{{ .GoName }},
{{- end }}
)
}
func (p *pgClientImpl) {{ .ConfigData.Name }}(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (ret []{{- if $.ConfigData.BoxResults }}*{{- end }}{{ .ReturnTypeName }}, err error) {
ret = []{{- if $.ConfigData.BoxResults }}*{{- end }}{{ .ReturnTypeName }}{}
var rows *sql.Rows
rows, err = p.{{ .ConfigData.Name }}Query(
ctx,
{{- range .Args}}
{{ .GoName }},
{{- end}}
)
if err != nil {
return nil, p.client.errorConverter(err)
}
defer func() {
if err == nil {
err = rows.Close()
if err != nil {
ret = nil
err = p.client.errorConverter(err)
}
} else {
rowErr := rows.Close()
if rowErr != nil {
err = p.client.errorConverter(fmt.Errorf("%s AND %s", err.Error(), rowErr.Error()))
}
}
}()
for rows.Next() {
var row {{ .ReturnTypeName }}
{{- if .MultiReturn }}
err = row.Scan(ctx, p.client, rows)
{{- else }}
{{- if (index .ReturnCols 0).Nullable }}
var scanTgt {{ (index .ReturnCols 0).TypeInfo.ScanNullName }}
err = rows.Scan({{ call (index .ReturnCols 0).TypeInfo.NullSqlReceiver "scanTgt" }})
if err != nil {
return nil, p.client.errorConverter(err)
}
row = {{ call (index .ReturnCols 0).TypeInfo.NullConvertFunc "scanTgt" }}
{{- else }}
err = rows.Scan({{ call (index .ReturnCols 0).TypeInfo.SqlReceiver "row" }})
if err != nil {
return nil, p.client.errorConverter(err)
}
{{- end }}
{{- end }}
{{- if $.ConfigData.BoxResults}}
ret = append(ret, &row)
{{- else }}
ret = append(ret, row)
{{- end }}
}
return
}
{{ .Comment }}
func (p *PGClient) {{ .ConfigData.Name }}Query(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (*sql.Rows, error) {
return p.impl.{{ .ConfigData.Name }}Query(
ctx,
{{- range .Args}}
{{ .GoName }},
{{- end}}
)
}
{{ .Comment }}
func (tx *TxPGClient) {{ .ConfigData.Name }}Query(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (*sql.Rows, error) {
return tx.impl.{{ .ConfigData.Name }}Query(
ctx,
{{- range .Args}}
{{ .GoName }},
{{- end}}
)
}
{{ .Comment }}
func (conn *ConnPGClient) {{ .ConfigData.Name }}Query(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (*sql.Rows, error) {
return conn.impl.{{ .ConfigData.Name }}Query(
ctx,
{{- range .Args}}
{{ .GoName }},
{{- end}}
)
}
func (p *pgClientImpl) {{ .ConfigData.Name }}Query(
ctx context.Context,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ .GoName }} {{ .TypeInfo.NullName }},
{{- else }}
{{ .GoName }} {{ .TypeInfo.Name }},
{{- end }}
{{- end }}
) (*sql.Rows, error) {
return p.queryContext(
ctx,
` + "`" +
`{{ .ConfigData.Body }}` +
"`" + `,
{{- range .Args }}
{{- if $.ConfigData.NullableArguments }}
{{ call .TypeInfo.NullSqlArgument .GoName }},
{{- else }}
{{ call .TypeInfo.SqlArgument .GoName }},
{{- end }}
{{- end }}
)
}
{{- end }}{{/* if .ConfigData.SingleResult */}}
`))