pgweb/api.go
2015-03-03 20:44:14 -06:00

333 lines
5.8 KiB
Go

package main
import (
"errors"
"fmt"
"mime"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/gin-gonic/gin"
)
var extraMimeTypes = map[string]string{
".icon": "image-x-icon",
".ttf": "application/x-font-ttf",
".woff": "application/x-font-woff",
".eot": "application/vnd.ms-fontobject",
".svg": "image/svg+xml",
}
type Error struct {
Message string `json:"error"`
}
func NewError(err error) Error {
return Error{err.Error()}
}
func assetContentType(name string) string {
ext := filepath.Ext(name)
result := mime.TypeByExtension(ext)
if result == "" {
result = extraMimeTypes[ext]
}
if result == "" {
result = "text/plain; charset=utf-8"
}
return result
}
func setupRoutes(router *gin.Engine) {
router.GET("/", API_Home)
router.GET("/static/*path", API_ServeAsset)
api := router.Group("/api")
{
api.Use(ApiMiddleware())
api.POST("/connect", API_Connect)
api.GET("/databases", API_GetDatabases)
api.GET("/connection", API_ConnectionInfo)
api.GET("/tables", API_GetTables)
api.GET("/tables/:table", API_GetTable)
api.GET("/tables/:table/rows", API_GetTableRows)
api.GET("/tables/:table/info", API_GetTableInfo)
api.GET("/tables/:table/indexes", API_TableIndexes)
api.GET("/query", API_RunQuery)
api.POST("/query", API_RunQuery)
api.GET("/explain", API_ExplainQuery)
api.POST("/explain", API_ExplainQuery)
api.GET("/history", API_History)
api.GET("/bookmarks", API_Bookmarks)
}
}
// Middleware function to check database connection status before running queries
func ApiMiddleware() gin.HandlerFunc {
allowedPaths := []string{
"/api/connect",
"/api/bookmarks",
"/api/history",
}
return func(c *gin.Context) {
if dbClient != nil {
c.Next()
return
}
currentPath := c.Request.URL.Path
allowed := false
for _, path := range allowedPaths {
if path == currentPath {
allowed = true
break
}
}
if allowed {
c.Next()
} else {
c.JSON(400, Error{"Not connected"})
c.Abort()
}
return
}
}
func API_Home(c *gin.Context) {
data, err := Asset("static/index.html")
if err != nil {
c.String(400, err.Error())
return
}
c.Data(200, "text/html; charset=utf-8", data)
}
func API_Connect(c *gin.Context) {
url := c.Request.FormValue("url")
if url == "" {
c.JSON(400, Error{"Url parameter is required"})
return
}
opts := Options{Url: url}
url, err := formatConnectionUrl(opts)
if err != nil {
c.JSON(400, Error{err.Error()})
return
}
client, err := NewClientFromUrl(url)
if err != nil {
c.JSON(400, Error{err.Error()})
return
}
err = client.Test()
if err != nil {
c.JSON(400, Error{err.Error()})
return
}
info, err := client.Info()
if err == nil {
if dbClient != nil {
dbClient.db.Close()
}
dbClient = client
}
c.JSON(200, info.Format()[0])
}
func API_GetDatabases(c *gin.Context) {
names, err := dbClient.Databases()
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, names)
}
func API_RunQuery(c *gin.Context) {
query := strings.TrimSpace(c.Request.FormValue("query"))
if query == "" {
c.JSON(400, errors.New("Query parameter is missing"))
return
}
API_HandleQuery(query, c)
}
func API_ExplainQuery(c *gin.Context) {
query := strings.TrimSpace(c.Request.FormValue("query"))
if query == "" {
c.JSON(400, errors.New("Query parameter is missing"))
return
}
API_HandleQuery(fmt.Sprintf("EXPLAIN ANALYZE %s", query), c)
}
func API_GetTables(c *gin.Context) {
names, err := dbClient.Tables()
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, names)
}
func API_GetTable(c *gin.Context) {
res, err := dbClient.Table(c.Params.ByName("table"))
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, res)
}
func API_GetTableRows(c *gin.Context) {
limit := 1000 // Number of rows to fetch
limitVal := c.Request.FormValue("limit")
if limitVal != "" {
num, err := strconv.Atoi(limitVal)
if err != nil {
c.JSON(400, Error{"Invalid limit value"})
return
}
if num <= 0 {
c.JSON(400, Error{"Limit should be greater than 0"})
return
}
limit = num
}
opts := RowsOptions{
Limit: limit,
SortColumn: c.Request.FormValue("sort_column"),
SortOrder: c.Request.FormValue("sort_order"),
}
res, err := dbClient.TableRows(c.Params.ByName("table"), opts)
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, res)
}
func API_GetTableInfo(c *gin.Context) {
res, err := dbClient.TableInfo(c.Params.ByName("table"))
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, res.Format()[0])
}
func API_History(c *gin.Context) {
c.JSON(200, dbClient.history)
}
func API_ConnectionInfo(c *gin.Context) {
res, err := dbClient.Info()
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, res.Format()[0])
}
func API_TableIndexes(c *gin.Context) {
res, err := dbClient.TableIndexes(c.Params.ByName("table"))
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, res)
}
func API_HandleQuery(query string, c *gin.Context) {
result, err := dbClient.Query(query)
if err != nil {
c.JSON(400, NewError(err))
return
}
q := c.Request.URL.Query()
if len(q["format"]) > 0 && q["format"][0] == "csv" {
filename := fmt.Sprintf("pgweb-%v.csv", time.Now().Unix())
c.Writer.Header().Set("Content-disposition", "attachment;filename="+filename)
c.Data(200, "text/csv", result.CSV())
return
}
c.JSON(200, result)
}
func API_Bookmarks(c *gin.Context) {
bookmarks, err := readAllBookmarks(bookmarksPath())
if err != nil {
c.JSON(400, NewError(err))
return
}
c.JSON(200, bookmarks)
}
func API_ServeAsset(c *gin.Context) {
path := "static" + c.Params.ByName("path")
data, err := Asset(path)
if err != nil {
c.String(400, err.Error())
return
}
if len(data) == 0 {
c.String(404, "Asset is empty")
return
}
c.Data(200, assetContentType(path), data)
}