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web_backend: Make Client use the PImpl idiom 

Like with TelemetryJson, we can make the implementation details private
and avoid the need to expose httplib to external libraries that need to
use the Client class.
This commit is contained in:
Lioncash 2018-10-10 21:23:41 -04:00
parent a7725d354c
commit 183a664405
5 changed files with 164 additions and 152 deletions
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1
src/common/web_result.h
View File

@ -5,6 +5,7 @@
#pragma once
#include <string>
#include "common/common_types.h"
namespace Common {
struct WebResult {

1
src/web_service/telemetry_json.cpp
View File

@ -4,6 +4,7 @@
#include <json.hpp>
#include "common/detached_tasks.h"
#include "common/web_result.h"
#include "web_service/telemetry_json.h"
#include "web_service/web_backend.h"

1
src/web_service/verify_login.cpp
View File

@ -3,6 +3,7 @@
// Refer to the license.txt file included.
#include <json.hpp>
#include "common/web_result.h"
#include "web_service/verify_login.h"
#include "web_service/web_backend.h"

115
src/web_service/web_backend.cpp
View File

@ -3,9 +3,11 @@
// Refer to the license.txt file included.
#include <cstdlib>
#include <mutex>
#include <string>
#include <thread>
#include <LUrlParser.h>
#include <httplib.h>
#include "common/common_types.h"
#include "common/logging/log.h"
#include "common/web_result.h"
#include "core/settings.h"
@ -20,19 +22,47 @@ constexpr u32 HTTPS_PORT = 443;
constexpr u32 TIMEOUT_SECONDS = 30;
Client::JWTCache Client::jwt_cache{};
Client::Client(const std::string& host, const std::string& username, const std::string& token)
: host(host), username(username), token(token) {
struct Client::Impl {
Impl(std::string host, std::string username, std::string token)
: host{std::move(host)}, username{std::move(username)}, token{std::move(token)} {
std::lock_guard<std::mutex> lock(jwt_cache.mutex);
if (username == jwt_cache.username && token == jwt_cache.token) {
if (this->username == jwt_cache.username && this->token == jwt_cache.token) {
jwt = jwt_cache.jwt;
}
}
}
Common::WebResult Client::GenericJson(const std::string& method, const std::string& path,
const std::string& data, const std::string& jwt,
const std::string& username, const std::string& token) {
/// A generic function handles POST, GET and DELETE request together
Common::WebResult GenericJson(const std::string& method, const std::string& path,
const std::string& data, bool allow_anonymous) {
if (jwt.empty()) {
UpdateJWT();
}
if (jwt.empty() && !allow_anonymous) {
LOG_ERROR(WebService, "Credentials must be provided for authenticated requests");
return Common::WebResult{Common::WebResult::Code::CredentialsMissing,
"Credentials needed"};
}
auto result = GenericJson(method, path, data, jwt);
if (result.result_string == "401") {
// Try again with new JWT
UpdateJWT();
result = GenericJson(method, path, data, jwt);
}
return result;
}
/**
* A generic function with explicit authentication method specified
* JWT is used if the jwt parameter is not empty
* username + token is used if jwt is empty but username and token are not empty
* anonymous if all of jwt, username and token are empty
*/
Common::WebResult GenericJson(const std::string& method, const std::string& path,
const std::string& data, const std::string& jwt = "",
const std::string& username = "", const std::string& token = "") {
if (cli == nullptr) {
auto parsedUrl = LUrlParser::clParseURL::ParseURL(host);
int port;
@ -40,8 +70,8 @@ Common::WebResult Client::GenericJson(const std::string& method, const std::stri
if (!parsedUrl.GetPort(&port)) {
port = HTTP_PORT;
}
cli =
std::make_unique<httplib::Client>(parsedUrl.m_Host.c_str(), port, TIMEOUT_SECONDS);
cli = std::make_unique<httplib::Client>(parsedUrl.m_Host.c_str(), port,
TIMEOUT_SECONDS);
} else if (parsedUrl.m_Scheme == "https") {
if (!parsedUrl.GetPort(&port)) {
port = HTTPS_PORT;
@ -70,7 +100,8 @@ Common::WebResult Client::GenericJson(const std::string& method, const std::stri
};
}
params.emplace(std::string("api-version"), std::string(API_VERSION.begin(), API_VERSION.end()));
params.emplace(std::string("api-version"),
std::string(API_VERSION.begin(), API_VERSION.end()));
if (method != "GET") {
params.emplace(std::string("Content-Type"), std::string("application/json"));
};
@ -109,10 +140,14 @@ Common::WebResult Client::GenericJson(const std::string& method, const std::stri
return Common::WebResult{Common::WebResult::Code::WrongContent, "Wrong content"};
}
return Common::WebResult{Common::WebResult::Code::Success, "", response.body};
}
}
// Retrieve a new JWT from given username and token
void UpdateJWT() {
if (username.empty() || token.empty()) {
return;
}
void Client::UpdateJWT() {
if (!username.empty() && !token.empty()) {
auto result = GenericJson("POST", "/jwt/internal", "", "", username, token);
if (result.result_code != Common::WebResult::Code::Success) {
LOG_ERROR(WebService, "UpdateJWT failed");
@ -123,27 +158,39 @@ void Client::UpdateJWT() {
jwt_cache.jwt = jwt = result.returned_data;
}
}
std::string host;
std::string username;
std::string token;
std::string jwt;
std::unique_ptr<httplib::Client> cli;
struct JWTCache {
std::mutex mutex;
std::string username;
std::string token;
std::string jwt;
};
static inline JWTCache jwt_cache;
};
Client::Client(std::string host, std::string username, std::string token)
: impl{std::make_unique<Impl>(std::move(host), std::move(username), std::move(token))} {}
Client::~Client() = default;
Common::WebResult Client::PostJson(const std::string& path, const std::string& data,
bool allow_anonymous) {
return impl->GenericJson("POST", path, data, allow_anonymous);
}
Common::WebResult Client::GenericJson(const std::string& method, const std::string& path,
const std::string& data, bool allow_anonymous) {
if (jwt.empty()) {
UpdateJWT();
}
Common::WebResult Client::GetJson(const std::string& path, bool allow_anonymous) {
return impl->GenericJson("GET", path, "", allow_anonymous);
}
if (jwt.empty() && !allow_anonymous) {
LOG_ERROR(WebService, "Credentials must be provided for authenticated requests");
return Common::WebResult{Common::WebResult::Code::CredentialsMissing, "Credentials needed"};
}
auto result = GenericJson(method, path, data, jwt);
if (result.result_string == "401") {
// Try again with new JWT
UpdateJWT();
result = GenericJson(method, path, data, jwt);
}
return result;
Common::WebResult Client::DeleteJson(const std::string& path, const std::string& data,
bool allow_anonymous) {
return impl->GenericJson("DELETE", path, data, allow_anonymous);
}
} // namespace WebService

58
src/web_service/web_backend.h
View File

@ -4,23 +4,19 @@
#pragma once
#include <functional>
#include <mutex>
#include <memory>
#include <string>
#include <tuple>
#include <httplib.h>
#include "common/common_types.h"
#include "common/web_result.h"
namespace httplib {
class Client;
namespace Common {
struct WebResult;
}
namespace WebService {
class Client {
public:
Client(const std::string& host, const std::string& username, const std::string& token);
Client(std::string host, std::string username, std::string token);
~Client();
/**
* Posts JSON to the specified path.
@ -30,9 +26,7 @@ public:
* @return the result of the request.
*/
Common::WebResult PostJson(const std::string& path, const std::string& data,
bool allow_anonymous) {
return GenericJson("POST", path, data, allow_anonymous);
}
bool allow_anonymous);
/**
* Gets JSON from the specified path.
@ -40,9 +34,7 @@ public:
* @param allow_anonymous If true, allow anonymous unauthenticated requests.
* @return the result of the request.
*/
Common::WebResult GetJson(const std::string& path, bool allow_anonymous) {
return GenericJson("GET", path, "", allow_anonymous);
}
Common::WebResult GetJson(const std::string& path, bool allow_anonymous);
/**
* Deletes JSON to the specified path.
@ -52,41 +44,11 @@ public:
* @return the result of the request.
*/
Common::WebResult DeleteJson(const std::string& path, const std::string& data,
bool allow_anonymous) {
return GenericJson("DELETE", path, data, allow_anonymous);
}
bool allow_anonymous);
private:
/// A generic function handles POST, GET and DELETE request together
Common::WebResult GenericJson(const std::string& method, const std::string& path,
const std::string& data, bool allow_anonymous);
/**
* A generic function with explicit authentication method specified
* JWT is used if the jwt parameter is not empty
* username + token is used if jwt is empty but username and token are not empty
* anonymous if all of jwt, username and token are empty
*/
Common::WebResult GenericJson(const std::string& method, const std::string& path,
const std::string& data, const std::string& jwt = "",
const std::string& username = "", const std::string& token = "");
// Retrieve a new JWT from given username and token
void UpdateJWT();
std::string host;
std::string username;
std::string token;
std::string jwt;
std::unique_ptr<httplib::Client> cli;
struct JWTCache {
std::mutex mutex;
std::string username;
std::string token;
std::string jwt;
};
static JWTCache jwt_cache;
struct Impl;
std::unique_ptr<Impl> impl;
};
} // namespace WebService