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hasb.go
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package hasb
import (
"encoding/json"
"errors"
"fmt"
"log"
"net/http"
"strings"
"time"
"github.com/gofrs/uuid"
"github.com/leonardacademy/graphqlc"
)
type EventPayload struct {
Event EventDetails `json:"event"`
CreatedAt time.Time `json:"created_at"`
Id uuid.UUID `json:"id"`
Table TableMetadata `json:"table"`
}
type EventDetails struct {
SessionAttributes map[string]interface{} `json:"session_variables"`
Op string `json:"op"`
RowChange RowChange `json:"data"`
}
type RowChange struct {
OldRow map[string]interface{} `json:"old"`
NewRow map[string]interface{} `json:"new"`
}
type TableMetadata struct {
Schema string `json:"schema"`
Name string `json:"name"`
}
type EventTrigger struct {
Name string `json:"name"`
}
type QResp map[string][]map[string]interface{}
type MResp map[string]MInnerResp
type MInnerResp struct {
AffectedRows int `json:"affected_rows"`
Returning []map[string]interface{} `json:"returning"`
}
func hasuraTypeOf(x interface{}) string {
switch x.(type) {
case int:
return "Int"
case int16:
return "Int"
case int32:
return "Int"
case bool:
return "Boolean"
case uuid.UUID:
return "uuid"
case string:
return "String"
}
log.Println("Could not identify type of variable", x, " while generating hasura request")
return ""
}
func GetEventPayload(r *http.Request) (*EventPayload, error) {
var err error
payload := new(EventPayload)
if r.Body != nil {
err = json.NewDecoder(r.Body).Decode(payload)
} else {
err = errors.New("request body is nil")
}
return payload, err
}
type Query struct {
Vars map[string]interface{}
getQueries []GetQuery
MutationQueries []MutationQuery
}
type GetQuery struct {
tables []GetQueryTable
}
type GetQueryTable struct {
Name string
Where *ExpressionTree
Objects []string
}
type MutationQuery struct {
UpdateQueries []UpdateQuery
InsertQueries []InsertQuery
DeleteQueries []DeleteQuery
}
type DeleteQuery struct {
TableName string
Where *ExpressionTree
Returning []string
AffectedRows bool
}
type InsertQuery struct {
TableName string
Objects map[string]string
Returning []string
AffectedRows bool
}
type UpdateQuery struct {
TableName string
Where *ExpressionTree
Set map[string]string
Returning []string
AffectedRows bool
}
func (q *Query) String() string {
var ret string
for i, gq := range q.getQueries {
ret += "query gq" + fmt.Sprintf("%d", i)
ret += wrapQuery(q.Vars, gq.String())
}
ret += "\n"
for i, mq := range q.MutationQueries {
ret += "mutation mq" + fmt.Sprintf("%d", i)
ret += wrapQuery(q.Vars, mq.String())
}
return ret
}
func (q *Query) Request() *graphqlc.Request {
ret := graphqlc.NewRequest(q.String())
for k, v := range q.Vars {
ret.Var(k, v)
}
return ret
}
func wrapQuery(Vars map[string]interface{}, q string) string {
ret := "("
for k, v := range Vars {
if strings.Contains(q, "$"+k) {
ret += "$" + k + ": " + hasuraTypeOf(v) + ", "
}
}
ret = strings.TrimSuffix(ret, ", ")
ret += ")"
ret = strings.TrimSuffix(ret, "()") //In case the above query does not contain any variables.
ret += " " + q
return ret
}
func (q *Query) AddGetQueries(gq ...GetQuery) {
if q.getQueries == nil {
q.getQueries = make([]GetQuery, 0)
}
for _, v := range gq {
q.getQueries = append(q.getQueries, v)
}
}
func (q *Query) AddMutationQueries(mq ...MutationQuery) {
if q.MutationQueries == nil {
q.MutationQueries = make([]MutationQuery, 0)
}
for _, v := range mq {
q.MutationQueries = append(q.MutationQueries, v)
}
}
func (gq *GetQuery) AddTables(gqt ...GetQueryTable) {
if gq.tables == nil {
gq.tables = make([]GetQueryTable, 0)
}
for _, v := range gqt {
gq.tables = append(gq.tables, v)
}
}
func (gq *GetQuery) String() string {
ret := "{\n"
for _, gtq := range gq.tables {
ret += gtq.String() + "\n"
}
ret += "}"
return ret
}
func (gtq *GetQueryTable) String() string {
ret := gtq.Name
if gtq.Where != nil {
ret += " (where: {" + gtq.Where.String() + "})"
}
ret += " {\n"
for _, v := range gtq.Objects {
ret += v + "\n"
}
ret += "}"
return ret
}
func (mq *MutationQuery) String() string {
ret := "{\n"
for _, uq := range mq.UpdateQueries {
ret += uq.String() + "\n"
}
for _, iq := range mq.InsertQueries {
ret += iq.String() + "\n"
}
for _, dq := range mq.DeleteQueries {
ret += dq.String() + "\n"
}
ret += "}"
return ret
}
func (uq *UpdateQuery) String() string {
ret := "update_" + uq.TableName
ret += "("
if uq.Where != nil {
ret += "where: {" + uq.Where.String() + "}, "
}
ret += "_set:{"
for k, v := range uq.Set {
ret += k + ": $" + v + ", "
}
ret = strings.TrimSuffix(ret, ", ")
ret += "}) {\n"
if uq.AffectedRows {
ret += "affected_rows\n"
}
if uq.Returning != nil && len(uq.Returning) > 0 {
ret += "returning {\n"
for _, v := range uq.Returning {
ret += v + "\n"
}
ret += "}\n"
}
ret += "}"
return ret
}
func (iq *InsertQuery) String() string {
ret := "insert_" + iq.TableName + "(objects:{"
for k, v := range iq.Objects {
ret += k + ": $" + v + ", "
}
ret = strings.TrimSuffix(ret, ", ")
ret += "}) {\n"
if iq.AffectedRows {
ret += "affected_rows\n"
}
if iq.Returning != nil && len(iq.Returning) > 0 {
ret += "returning {\n"
for _, v := range iq.Returning {
ret += v + "\n"
}
ret += "}\n"
}
ret += "}"
return ret
}
func (dq *DeleteQuery) String() string {
ret := "delete_" + dq.TableName + "(where: {" + dq.Where.String() + "}){\n"
if dq.AffectedRows {
ret += "affected_rows\n"
}
if dq.Returning != nil {
for _, v := range dq.Returning {
ret += v + "\n"
}
}
ret += "}"
return ret
}