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DemoProcessor.d
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DemoProcessor.d
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module http.DemoProcessor;
// import stdx.data.json;
import std.json;
//import hunt.database;
import hunt.io;
import http.Processor;
import http.HttpURI;
import http.UrlEncoded;
import hunt.logging.ConsoleLogger : trace, warning, tracef;
import std.algorithm;
import std.array;
import std.exception;
import std.random;
import std.string;
version (POSTGRESQL) {
__gshared Database dbConnection;
}
enum HttpHeader textHeader = HttpHeader("Content-Type", "text/plain; charset=UTF-8");
enum HttpHeader htmlHeader = HttpHeader("Content-Type", "text/html; charset=UTF-8");
enum HttpHeader jsonHeader = HttpHeader("Content-Type", "application/json; charset=UTF-8");
enum plaintextLength = "/plaintext".length;
enum jsonLength = "/json".length;
enum dbLength = "/db".length;
enum fortunesLength = "/fortunes".length;
class DemoProcessor : HttpProcessor {
version (POSTGRESQL) HttpURI uri;
this(TcpStream client) {
version (POSTGRESQL) uri = new HttpURI();
super(client);
}
override void onComplete(HttpRequest req) {
string path = req.uri;
if(path.length == plaintextLength) { // plaintext
respondWith("Hello, World!", 200, textHeader);
} else if(path.length == jsonLength) { // json
JSONValue js = JSONValue(["message" : JSONValue("Hello, World!")]);
respondWith(js.toJSON(), 200, jsonHeader);
} else {
version (POSTGRESQL) {
if(path.length == dbLength) {
respondSingleQuery();
} else if(path.length == fortunesLength) {
respondFortunes();
} else {
handleDbUpdate(path);
}
} else {
respondWith404();
}
}
}
private void respondWith404() {
version (POSTGRESQL) {
respondWith("The available paths are: /plaintext, /json, /db, /fortunes," ~
" /queries?queries=number, /updates?queries=number", 404);
} else {
respondWith("The available paths are: /plaintext, /json", 404);
}
}
version (POSTGRESQL) {
private void handleDbUpdate(string url) {
uri.parse(url);
switch(uri.getPath()) {
case "/queries":
UrlEncoded queriesMap = new UrlEncoded();
uri.decodeQueryTo(queriesMap);
int number = 1;
debug {
trace(queriesMap.toString());
if (!queriesMap.containsKey("queries")) {
respondWith404();
return;
}
string v = queriesMap.getValue("queries", 0);
if (!v.empty) {
try {
number = to!int(v);
} catch (Exception ex) {
warning(ex.msg);
}
}
} else {
string v = queriesMap.getValue("queries", 0);
if (!v.empty) {
try {
number = to!int(v);
} catch (Exception ex) {
}
}
}
respondMultipleQuery(number);
break;
case "/updates":
UrlEncoded queriesMap = new UrlEncoded();
uri.decodeQueryTo(queriesMap);
int number = 1;
debug {
if (!queriesMap.containsKey("queries")) {
respondWith404();
return;
}
string v = queriesMap.getValue("queries", 0);
if (!v.empty) {
try {
number = to!int(v);
} catch (Exception ex) {
warning(ex.msg);
}
}
} else {
string v = queriesMap.getValue("queries", 0);
if (!v.empty) {
try {
number = to!int(v);
} catch (Exception ex) {
}
}
}
respondUpdates(number);
break;
default:
respondWith404();
break;
}
}
private void respondSingleQuery() {
int id = uniform(1, 10001);
string query = "SELECT randomNumber FROM world WHERE id = " ~ id.to!string;
ResultSet rs = dbConnection.query(query);
JSONValue js = JSONValue(["id" : JSONValue(id), "randomNumber"
: JSONValue(to!int(rs.front()[0]))]);
respondWith(js.toJSON(), 200, jsonHeader);
}
private void respondMultipleQuery(int queries) {
if (queries < 1)
queries = 1;
else if (queries > 500)
queries = 500;
JSONValue[] arr = new JSONValue[queries];
for (int i = 0; i < queries; i++) {
immutable id = uniform(1, 10001);
immutable query = "SELECT randomNumber FROM world WHERE id = " ~ id.to!string;
ResultSet rs = dbConnection.query(query);
arr[i] = JSONValue(["id" : JSONValue(id), "randomNumber"
: JSONValue(to!int(rs.front()[0]))]);
}
JSONValue js = JSONValue(arr);
respondWith(js.toJSON(), 200, jsonHeader);
}
private void respondFortunes() {
immutable query = "SELECT id, message::text FROM Fortune";
ResultSet rs = dbConnection.query(query);
FortuneModel[] data = rs.map!(f => FortuneModel(f["id"].to!int, f["message"])).array;
data ~= FortuneModel(0, "Additional fortune added at request time.");
data.sort!((a, b) => a.message < b.message);
// trace(data);
respondWith(randerFortunes(data), 200, htmlHeader);
}
static string randerFortunes(FortuneModel[] data) {
Appender!string sb;
sb.put(`<!DOCTYPE html>
<html>
<head>
<title>Fortunes</title>
</head>
<body>
<table>
<tr>
<th>id</th><th>message</th>
</tr>
`);
foreach (FortuneModel f; data) {
string message = replace(f.message, ">", ">");
message = replace(message, "<", "<");
message = replace(message, "\"", """);
sb.put(format(" <tr>\n <td>%d</td><td>%s</td>\n </tr>\n", f.id, message));
}
sb.put(" </table>\n </body>\n</html>");
return sb.data;
}
private void respondUpdates(int queries) {
if (queries < 1)
queries = 1;
else if (queries > 500)
queries = 500;
JSONValue[] arr = new JSONValue[queries];
for (int i = 0; i < queries; i++) {
immutable id = uniform(1, 10001);
immutable idString = id.to!string;
immutable query = "SELECT randomNumber FROM world WHERE id = " ~ idString;
ResultSet rs = dbConnection.query(query);
int randomNumber = to!int(rs.front()[0]);
debug tracef("id=%d, randomNumber=%d", id, randomNumber);
randomNumber = uniform(1, 10001);
string updateSql = "UPDATE world SET randomNumber = "
~ randomNumber.to!string ~ " WHERE id = " ~ idString;
int r = dbConnection.execute(updateSql);
// debug tracef("r=%d", r);
arr[i] = JSONValue(["id" : JSONValue(id), "randomNumber" : JSONValue(randomNumber)]);
}
JSONValue js = JSONValue(arr);
respondWith(js.toJSON(), 200, jsonHeader);
}
}
}
struct FortuneModel {
int id;
string message;
}