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soma_handler_attributes.go
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/
soma_handler_attributes.go
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package main
import (
"database/sql"
"errors"
"fmt"
"log"
"github.com/1and1/soma/lib/proto"
)
type somaAttributeRequest struct {
action string
Attribute proto.Attribute
reply chan somaResult
}
type somaAttributeResult struct {
ResultError error
Attribute proto.Attribute
}
func (a *somaAttributeResult) SomaAppendError(r *somaResult, err error) {
if err != nil {
r.Attributes = append(r.Attributes,
somaAttributeResult{ResultError: err})
}
}
func (a *somaAttributeResult) SomaAppendResult(r *somaResult) {
r.Attributes = append(r.Attributes, *a)
}
/* Read Access
*/
type somaAttributeReadHandler struct {
input chan somaAttributeRequest
shutdown chan bool
conn *sql.DB
list_stmt *sql.Stmt
show_stmt *sql.Stmt
}
func (r *somaAttributeReadHandler) run() {
var err error
if r.list_stmt, err = r.conn.Prepare(stmtAttributeList); err != nil {
log.Fatal("attribute/list: ", err)
}
defer r.list_stmt.Close()
if r.show_stmt, err = r.conn.Prepare(stmtAttributeShow); err != nil {
log.Fatal("attribute/show: ", err)
}
defer r.show_stmt.Close()
runloop:
for {
select {
case <-r.shutdown:
break runloop
case req := <-r.input:
go func() {
r.process(&req)
}()
}
}
}
func (r *somaAttributeReadHandler) process(q *somaAttributeRequest) {
var (
attribute, cardinality string
rows *sql.Rows
err error
)
result := somaResult{}
switch q.action {
case "list":
log.Printf("R: attributes/list")
rows, err = r.list_stmt.Query()
defer rows.Close()
if result.SetRequestError(err) {
q.reply <- result
return
}
for rows.Next() {
err := rows.Scan(&attribute, &cardinality)
result.Append(err, &somaAttributeResult{
Attribute: proto.Attribute{
Name: attribute,
Cardinality: cardinality,
},
})
}
case "show":
log.Printf("R: attribute/show for %s", q.Attribute.Name)
err = r.show_stmt.QueryRow(q.Attribute.Name).Scan(
&attribute,
&cardinality,
)
if err != nil {
if err == sql.ErrNoRows {
result.SetNotFound()
} else {
_ = result.SetRequestError(err)
}
q.reply <- result
return
}
result.Append(err, &somaAttributeResult{
Attribute: proto.Attribute{
Name: attribute,
Cardinality: cardinality,
},
})
default:
result.SetNotImplemented()
}
q.reply <- result
}
/* Write Access
*/
type somaAttributeWriteHandler struct {
input chan somaAttributeRequest
shutdown chan bool
conn *sql.DB
add_stmt *sql.Stmt
del_stmt *sql.Stmt
}
func (w *somaAttributeWriteHandler) run() {
var err error
if w.add_stmt, err = w.conn.Prepare(stmtAttributeAdd); err != nil {
log.Fatal("attribute/add: ", err)
}
defer w.add_stmt.Close()
if w.del_stmt, err = w.conn.Prepare(stmtAttributeDelete); err != nil {
log.Fatal("attribute/delete: ", err)
}
defer w.del_stmt.Close()
runloop:
for {
select {
case <-w.shutdown:
break runloop
case req := <-w.input:
w.process(&req)
}
}
}
func (w *somaAttributeWriteHandler) process(q *somaAttributeRequest) {
var (
res sql.Result
err error
)
result := somaResult{}
switch q.action {
case "add":
log.Printf("R: attributes/add for %s", q.Attribute.Name)
res, err = w.add_stmt.Exec(
q.Attribute.Name,
q.Attribute.Cardinality,
)
case "delete":
log.Printf("R: attributes/del for %s", q.Attribute.Name)
res, err = w.del_stmt.Exec(
q.Attribute.Name,
)
default:
log.Printf("R: unimplemented attributes/%s", q.action)
result.SetNotImplemented()
q.reply <- result
return
}
if result.SetRequestError(err) {
q.reply <- result
return
}
rowCnt, _ := res.RowsAffected()
switch {
case rowCnt == 0:
result.Append(errors.New("No rows affected"), &somaAttributeResult{})
case rowCnt > 1:
result.Append(fmt.Errorf("Too many rows affected: %d", rowCnt),
&somaAttributeResult{})
default:
result.Append(nil, &somaAttributeResult{
Attribute: q.Attribute,
})
}
q.reply <- result
}
/* Ops Access
*/
func (r *somaAttributeReadHandler) shutdownNow() {
r.shutdown <- true
}
func (w *somaAttributeWriteHandler) shutdownNow() {
w.shutdown <- true
}
// vim: ts=4 sw=4 sts=4 noet fenc=utf-8 ffs=unix