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query.go
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package query
import (
"context"
"fmt"
"strings"
"time"
"github.com/glennliao/apijson-go/config"
"github.com/glennliao/apijson-go/model"
"github.com/glennliao/apijson-go/util"
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/util/gconv"
"github.com/samber/lo"
)
type Query struct {
ctx context.Context
// json请求内容
req model.Map
// 节点树根节点
rootNode *Node
// 用于根据path获取节点
pathNodes map[string]*Node
startAt time.Time
endAt time.Time
err error
// 输出过程
PrintProcessLog bool
// 关闭权限验证 , 默认否
NoAccessVerify bool
queryConfig *config.QueryConfig
// 自定义可访问权限的限定, 例如添加用户id的where条件
AccessCondition config.AccessCondition
DbMeta *config.DBMeta
// dbFieldStyle 数据库字段命名风格 请求传递到数据库中
DbFieldStyle config.FieldStyle
// jsonFieldStyle 数据库返回的字段
JsonFieldStyle config.FieldStyle
// Config *config.Config
}
func New(ctx context.Context, qc *config.QueryConfig, req model.Map) *Query {
q := &Query{
queryConfig: qc,
}
q.init(ctx, req)
q.NoAccessVerify = qc.NoVerify()
return q
}
func (q *Query) init(ctx context.Context, req model.Map) {
q.ctx = ctx
q.req = req
q.startAt = time.Now()
q.pathNodes = make(map[string]*Node)
}
func (q *Query) Result() (model.Map, error) {
if q.PrintProcessLog {
g.Log().Debugf(q.ctx, "【query】 ============ [begin]")
g.Log().Debugf(q.ctx, "【query】 ============ [buildNodeTree]")
}
// 构建节点树,并校验结构是否符合, 不符合则返回错误, 结束本次查询
q.rootNode = newNode(q, "", "", q.req)
err := q.rootNode.buildChild()
if err != nil {
return nil, err
}
if q.PrintProcessLog {
q.printNode(q.rootNode, 0)
}
if q.PrintProcessLog {
g.Log().Debugf(q.ctx, "【query】 ============ [parse]")
}
setNodeRole(q.rootNode, "", "")
q.rootNode.parse()
if q.PrintProcessLog {
g.Log().Debugf(q.ctx, "【query】 ============ [fetch]")
}
q.fetch()
if q.err != nil {
return nil, q.err
}
resultMap, err := q.rootNode.Result()
if err != nil {
if q.rootNode.err != nil {
return nil, q.rootNode.err
}
ret := model.Map{}
for k, node := range q.rootNode.children {
ret[k] = node.err
}
return ret, err
}
if q.PrintProcessLog {
g.Log().Debugf(q.ctx, "【query】 ^=======================^")
}
return resultMap.(model.Map), err
}
func (q *Query) fetch() {
// 分析依赖关系
var prerequisites [][]string
analysisRef(q.rootNode, &prerequisites)
fetchQueue, err := util.AnalysisOrder(prerequisites)
if err != nil {
q.err = err
return
}
for k, _ := range q.pathNodes {
if !lo.Contains(fetchQueue, k) {
fetchQueue = append(fetchQueue, k)
}
}
if q.PrintProcessLog {
g.Log().Debugf(q.ctx, "fetch queue： %s", strings.Join(fetchQueue, " > "))
}
for _, path := range fetchQueue {
q.pathNodes[path].fetch()
}
q.rootNode.fetch()
}
// 输出节点信息
func (q *Query) printNode(n *Node, deep int) {
for i := 0; i < deep; i++ {
fmt.Print("|")
}
desc := gconv.String(n.Type)
if n.isList {
desc += "[]"
}
format := fmt.Sprintf("- %%-%ds | %%s\n", 20-deep)
fmt.Printf(format, n.Key, desc)
for _, node := range n.children {
q.printNode(node, deep+1)
}
}