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web_backend: Make Client use the PImpl idiom

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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.
pull/8/head
Lioncash 6 years ago
parent a7725d354c
commit 183a664405
5 changed files with 154 additions and 142 deletions
Show Stats Download Patch File Download Diff File

1
src/common/web_result.h
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@ -5,6 +5,7 @@
#pragma once
#include <string>
#include "common/common_types.h"
namespace Common {
struct WebResult {

1
src/web_service/telemetry_json.cpp
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@ -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
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@ -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"

235
src/web_service/web_backend.cpp
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@ -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"
@ -20,99 +22,132 @@ constexpr u32 HTTPS_PORT = 443;
constexpr u32 TIMEOUT_SECONDS = 30;
Client::JWTCache Client::jwt_cache{};
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 (this->username == jwt_cache.username && this->token == jwt_cache.token) {
jwt = jwt_cache.jwt;
}
}
/// 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);
}
Client::Client(const std::string& host, const std::string& username, const std::string& token)
: host(host), username(username), token(token) {
std::lock_guard<std::mutex> lock(jwt_cache.mutex);
if (username == jwt_cache.username && token == jwt_cache.token) {
jwt = jwt_cache.jwt;
return result;
}
}
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) {
if (cli == nullptr) {
auto parsedUrl = LUrlParser::clParseURL::ParseURL(host);
int port;
if (parsedUrl.m_Scheme == "http") {
if (!parsedUrl.GetPort(&port)) {
port = HTTP_PORT;
}
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;
/**
* 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;
if (parsedUrl.m_Scheme == "http") {
if (!parsedUrl.GetPort(&port)) {
port = HTTP_PORT;
}
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;
}
cli = std::make_unique<httplib::SSLClient>(parsedUrl.m_Host.c_str(), port,
TIMEOUT_SECONDS);
} else {
LOG_ERROR(WebService, "Bad URL scheme {}", parsedUrl.m_Scheme);
return Common::WebResult{Common::WebResult::Code::InvalidURL, "Bad URL scheme"};
}
cli = std::make_unique<httplib::SSLClient>(parsedUrl.m_Host.c_str(), port,
TIMEOUT_SECONDS);
} else {
LOG_ERROR(WebService, "Bad URL scheme {}", parsedUrl.m_Scheme);
return Common::WebResult{Common::WebResult::Code::InvalidURL, "Bad URL scheme"};
}
}
if (cli == nullptr) {
LOG_ERROR(WebService, "Invalid URL {}", host + path);
return Common::WebResult{Common::WebResult::Code::InvalidURL, "Invalid URL"};
}
if (cli == nullptr) {
LOG_ERROR(WebService, "Invalid URL {}", host + path);
return Common::WebResult{Common::WebResult::Code::InvalidURL, "Invalid URL"};
}
httplib::Headers params;
if (!jwt.empty()) {
params = {
{std::string("Authorization"), fmt::format("Bearer {}", jwt)},
};
} else if (!username.empty()) {
params = {
{std::string("x-username"), username},
{std::string("x-token"), token},
httplib::Headers params;
if (!jwt.empty()) {
params = {
{std::string("Authorization"), fmt::format("Bearer {}", jwt)},
};
} else if (!username.empty()) {
params = {
{std::string("x-username"), username},
{std::string("x-token"), token},
};
}
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"));
};
}
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"));
};
httplib::Request request;
request.method = method;
request.path = path;
request.headers = params;
request.body = data;
httplib::Request request;
request.method = method;
request.path = path;
request.headers = params;
request.body = data;
httplib::Response response;
httplib::Response response;
if (!cli->send(request, response)) {
LOG_ERROR(WebService, "{} to {} returned null", method, host + path);
return Common::WebResult{Common::WebResult::Code::LibError, "Null response"};
}
if (!cli->send(request, response)) {
LOG_ERROR(WebService, "{} to {} returned null", method, host + path);
return Common::WebResult{Common::WebResult::Code::LibError, "Null response"};
}
if (response.status >= 400) {
LOG_ERROR(WebService, "{} to {} returned error status code: {}", method, host + path,
response.status);
return Common::WebResult{Common::WebResult::Code::HttpError,
std::to_string(response.status)};
}
if (response.status >= 400) {
LOG_ERROR(WebService, "{} to {} returned error status code: {}", method, host + path,
response.status);
return Common::WebResult{Common::WebResult::Code::HttpError,
std::to_string(response.status)};
}
auto content_type = response.headers.find("content-type");
auto content_type = response.headers.find("content-type");
if (content_type == response.headers.end()) {
LOG_ERROR(WebService, "{} to {} returned no content", method, host + path);
return Common::WebResult{Common::WebResult::Code::WrongContent, ""};
}
if (content_type == response.headers.end()) {
LOG_ERROR(WebService, "{} to {} returned no content", method, host + path);
return Common::WebResult{Common::WebResult::Code::WrongContent, ""};
if (content_type->second.find("application/json") == std::string::npos &&
content_type->second.find("text/html; charset=utf-8") == std::string::npos) {
LOG_ERROR(WebService, "{} to {} returned wrong content: {}", method, host + path,
content_type->second);
return Common::WebResult{Common::WebResult::Code::WrongContent, "Wrong content"};
}
return Common::WebResult{Common::WebResult::Code::Success, "", response.body};
}
if (content_type->second.find("application/json") == std::string::npos &&
content_type->second.find("text/html; charset=utf-8") == std::string::npos) {
LOG_ERROR(WebService, "{} to {} returned wrong content: {}", method, host + path,
content_type->second);
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;
}
}
}
Common::WebResult Client::GenericJson(const std::string& method, const std::string& path,
const std::string& data, bool allow_anonymous) {
if (jwt.empty()) {
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 inline JWTCache jwt_cache;
};
if (jwt.empty() && !allow_anonymous) {
LOG_ERROR(WebService, "Credentials must be provided for authenticated requests");
return Common::WebResult{Common::WebResult::Code::CredentialsMissing, "Credentials needed"};
}
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))} {}
auto result = GenericJson(method, path, data, jwt);
if (result.result_string == "401") {
// Try again with new JWT
UpdateJWT();
result = GenericJson(method, path, data, jwt);
}
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::GetJson(const std::string& path, bool allow_anonymous) {
return impl->GenericJson("GET", path, "", allow_anonymous);
}
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
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@ -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

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