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pgdb_message.go
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/
pgdb_message.go
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package pgdb
import (
"fmt"
"io"
pgdb_v1 "github.com/ductone/protoc-gen-pgdb/pgdb/v1"
pgs "github.com/lyft/protoc-gen-star"
pgsgo "github.com/lyft/protoc-gen-star/lang/go"
)
type messageTemplateContext struct {
ReceiverType string
MessageType string
DescriptorType string
Fields []*fieldContext
SearchFields []*searchFieldContext
Indexes []*indexContext
WantRecordStringBuilder bool
}
func (module *Module) renderMessage(ctx pgsgo.Context, w io.Writer, in pgs.File, m pgs.Message, ix *importTracker) error {
ext := pgdb_v1.MessageOptions{}
_, err := m.Extension(pgdb_v1.E_Msg, &ext)
if err != nil {
panic(fmt.Errorf("pgdb: getFieldIndexes: failed to extract Message extension from '%s': %w", m.FullyQualifiedName(), err))
}
ix.PGDBV1 = true
ix.GoquExp = true
wantRecordStringBuilder := false
if !ext.NestedOnly {
// used by pk/sk builder
wantRecordStringBuilder = true
ix.Strings = true
// used by pb_data
ix.ProtobufProto = true
}
fields := module.getMessageFields(ctx, m, ix, "m.self")
c := &messageTemplateContext{
ReceiverType: ctx.Name(m).String(),
MessageType: getMessageType(ctx, m),
DescriptorType: getDescriptorType(ctx, m),
Fields: fields,
SearchFields: getSearchFields(ctx, m),
Indexes: module.getMessageIndexes(ctx, m, ix),
WantRecordStringBuilder: wantRecordStringBuilder,
}
return templates["message.tmpl"].Execute(w, c)
}
func getMessageType(ctx pgsgo.Context, m pgs.Message) string {
return "pgdbMessage" + ctx.Name(m).String()
}
type varNamer struct {
prefix string
offset int
}
func (fn *varNamer) Next() *varNamer {
return &varNamer{offset: fn.offset + 1, prefix: fn.prefix}
}
func (fn *varNamer) String() string {
return fmt.Sprintf("%s%d", fn.prefix, fn.offset)
}
func (module *Module) getMessageFieldsDeep(ctx pgsgo.Context, m pgs.Message, ix *importTracker, goPrefix string, dbPrefix string, humanPrefix string) []*fieldContext {
fields := m.Fields()
rv := make([]*fieldContext, 0, len(fields))
tenantIdField := "tenant_id"
// only top level embed gets a common field and has a full protoc API
if dbPrefix == "" {
ix.ProtobufEncodingJSON = true
cfs, err := getCommonFields(ctx, m, ix)
if err != nil {
panic(err)
}
for _, cf := range cfs {
cf.DBFieldNameDeep = cf.DB.Name
rv = append(rv, cf)
}
fext := pgdb_v1.MessageOptions{}
_, err = m.Extension(pgdb_v1.E_Msg, &fext)
if err != nil {
panic(err)
}
if !fext.NestedOnly {
tenantIdField, err = getTenantIDField(m)
if err != nil {
panic(err)
}
}
}
vn := &varNamer{prefix: "oneof", offset: 0}
for _, oneof := range m.RealOneOfs() {
vn = vn.Next()
fc := module.getOneOf(ctx, oneof, vn, ix)
if fc == nil {
continue
}
name, err := getColumnOneOfName(oneof)
if err != nil {
panic(err)
}
fc.DBFieldNameDeep = dbPrefix + name
if humanPrefix != "" {
fc.GoName = humanPrefix + fc.GoName
}
rv = append(rv, fc)
}
vn = &varNamer{prefix: "v", offset: 0}
for _, field := range fields {
// tenant_id done via common fields and shouldn't be nested
if tenantIdField == field.Name().LowerSnakeCase().String() {
continue
}
vn = vn.Next()
fc, err := module.getFieldSafe(ctx, field, vn, ix, goPrefix)
if fc == nil || err != nil {
continue
}
name, err := getColumnName(fc.Field)
if err != nil {
panic(err)
}
fc.DBFieldNameDeep = dbPrefix + name
rv = append(rv, fc)
var embededMessage pgs.Message
if fc.Field != nil {
embededMessage = fc.Field.Type().Embed()
}
if embededMessage == nil {
if humanPrefix != "" {
fc.GoName = humanPrefix + fc.GoName
}
continue
}
// NOTE: humanPrefixes need to avoid exponential growth of prefixes (for two deep or lower).
nextHumanPrefix := humanPrefix + fc.GoName
if humanPrefix != "" {
fc.GoName = humanPrefix
}
pre := getNestedName(fc.Field)
rv = append(rv, module.getMessageFieldsDeep(ctx, embededMessage, ix, goPrefix, dbPrefix+pre, nextHumanPrefix)...)
}
return rv
}
func (module *Module) getMessageFields(ctx pgsgo.Context, m pgs.Message, ix *importTracker, goPrefix string) []*fieldContext {
fields := m.Fields()
rv := make([]*fieldContext, 0, len(fields))
ix.ProtobufEncodingJSON = true
cf, err := getCommonFields(ctx, m, ix)
if err != nil {
panic(err)
}
rv = append(rv, cf...)
vn := &varNamer{prefix: "v", offset: 0}
tenantIdField := ""
fext := pgdb_v1.MessageOptions{}
_, err = m.Extension(pgdb_v1.E_Msg, &fext)
if err != nil {
panic(err)
}
if !fext.NestedOnly {
tenantIdField, err = getTenantIDField(m)
if err != nil {
panic(err)
}
}
rv = append(rv, module.getMessageFieldsInner(ctx, fields, vn, tenantIdField, ix, goPrefix)...)
vn = &varNamer{prefix: "oneof", offset: 0}
for _, oneof := range m.RealOneOfs() {
vn = vn.Next()
fieldRep := module.getOneOf(ctx, oneof, vn, ix)
if fieldRep != nil {
rv = append(rv, fieldRep)
}
}
return rv
}
func (module *Module) getMessageFieldsInner(ctx pgsgo.Context, fields []pgs.Field, vn *varNamer, tenantIdField string, ix *importTracker, goPrefix string) []*fieldContext {
rv := make([]*fieldContext, 0, len(fields))
for _, field := range fields {
// tenant_id done via common fields
if tenantIdField == field.Name().LowerSnakeCase().String() {
continue
}
vn = vn.Next()
fieldRep := module.getField(ctx, field, vn, ix, goPrefix)
if fieldRep != nil {
rv = append(rv, fieldRep)
}
}
return rv
}