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server.go
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server.go
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package main
import (
"os"
"fmt"
"log"
"math"
"bytes"
"strconv"
"net/http"
"html/template"
)
const pageSz = 15 // rows in table to display
var es *ElasticClient
var templates = template.Must(template.ParseFiles("./html/table.html", "./html/index.html"))
var sections = [2]string {"1. Business","1A. Risk Factors"}
var years = [20]string {"2005","2006","2007","2008","2009","2010","2011","2012","2013","2014",
"2015","2016","2017","2018","2019","2020","2021","2022","2023","2024"}
const yearUpperBound = 2024
const yearLowerBound = 2005
const defaultYear = "2024"
const defaultStockIndex = "S&P 500"
const defaultSection = "1. Business"
const defaultPage = "1"
// struct of query string parameters to pass around
type Parameters struct {
searchTerm string
stockIndex string
section string
year string
page int
}
type TableData struct {
Page int
Pages int
Year string
Section string
Years []string
Sections []string
Hits [](map[string]any)
}
func prepareTable(p *Parameters) (*TableData, error) {
var (
total int
tableData TableData
err error
)
total, tableData.Hits, err = es.highlightSearch(p.searchTerm, p.stockIndex,
p.section, p.year, p.page, pageSz)
if err != nil {
return &tableData, err
}
tableData.Page = p.page
tableData.Pages = int(math.Ceil(float64(total) / float64(pageSz)))
tableData.Year = p.year
tableData.Section = p.section
for _, y := range years {
if y != p.year {
tableData.Years = append(tableData.Years, y)
}
}
for _, s := range sections {
if s != p.section {
tableData.Sections = append(tableData.Sections, s)
}
}
return &tableData, err
}
func home(w http.ResponseWriter, r *http.Request) {
var (
buf bytes.Buffer
err error
)
// log request
log.Printf(",%s,HOME\n", r.URL.Path)
err = templates.ExecuteTemplate(&buf, "index.html", nil)
if err != nil {
http.Error(w, "template error", http.StatusInternalServerError)
log.Printf("execute template error for index.html: %s\n", err.Error())
return
}
fmt.Fprintf(w, "%s", buf.String())
}
func updateTableHandler(w http.ResponseWriter, r *http.Request, p *Parameters) {
var (
buf bytes.Buffer
tableData *TableData
err error
)
tableData, err = prepareTable(p)
if err != nil {
http.Error(w, "prepare table error", http.StatusInternalServerError)
log.Printf("in update table with search term '%s', prepare table error: %s\n",
p.searchTerm, err.Error())
return
}
err = templates.ExecuteTemplate(&buf, "hits", tableData)
if err != nil {
http.Error(w, "template error", http.StatusInternalServerError)
log.Printf("in update table with search term '%s', execute template error: %s\n",
p.searchTerm, err.Error())
return
}
fmt.Fprintf(w, "%s", buf.String())
}
func searchHandler(w http.ResponseWriter, r *http.Request, p *Parameters) {
var (
buf bytes.Buffer
tableData *TableData
err error
)
counts, err := es.histogramSearch(p.searchTerm, p.stockIndex)
if err != nil {
http.Error(w, "histogram search error", http.StatusInternalServerError)
log.Printf("in searchHandler with search term '%s', histogram search error: %s\n",
p.searchTerm, err.Error())
return
}
err = renderGraph(counts, p, &buf)
if err != nil {
http.Error(w, "graph render error", http.StatusInternalServerError)
log.Printf("in searchHandler with search term '%s', render graph error: %s\n",
p.searchTerm, err.Error())
return
}
tableData, err = prepareTable(p)
if err != nil {
http.Error(w, "prepare table error", http.StatusInternalServerError)
log.Printf("in searchHandler with search term '%s', prepare table error: %s\n",
p.searchTerm, err.Error())
return
}
err = templates.ExecuteTemplate(&buf, "table.html", tableData)
if err != nil {
http.Error(w, "template error", http.StatusInternalServerError)
log.Printf("in searchHandler with search term '%s', execute template error: %s\n",
p.searchTerm, err.Error())
return
}
fmt.Fprintf(w, "%s", buf.String())
}
// helper function to check request parameters and supply defaults
func paramStr(r *http.Request, name string, def string) string {
var param string
param = r.FormValue(name)
if param == "" {
return def
}
return param
}
func processParameters(fn func (http.ResponseWriter, *http.Request, *Parameters)) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
var (
p Parameters
err error
)
p.searchTerm = r.FormValue("searchterm")
p.stockIndex = paramStr(r, "stockindex", defaultStockIndex)
p.section = paramStr(r, "section", defaultSection)
p.year = paramStr(r, "year", defaultYear)
pageStr := paramStr(r, "p", defaultPage)
p.page, err = strconv.Atoi(pageStr)
if err != nil || p.page < 1 {
http.Error(w, "invalid page parameter", http.StatusBadRequest)
return
}
// log all requests
log.Printf(",%s,'%s',%s,%s,%s,%d\n", r.URL.Path, p.searchTerm, p.stockIndex,
p.section, p.year, p.page, )
fn(w, r, &p);
}
}
func main() {
port := os.Getenv("PORT")
if port == "" {
log.Fatal("Must set PORT and ES related environmental variables")
}
es = NewElasticClient()
http.HandleFunc("/", home)
http.HandleFunc("/search", processParameters(searchHandler))
http.HandleFunc("/filter", processParameters(updateTableHandler))
panic(http.ListenAndServe(port, nil))
}