C++ client for making HTTP/REST requests

Overview

REST client for C++

Build Status Coverage Status Packagecloud doxygen MIT license

About

This is a simple REST client for C++. It wraps libcurl for HTTP requests.

Usage

restclient-cpp provides two ways of interacting with REST endpoints. There is a simple one, which doesn't need you to configure an object to interact with an API. However the simple way doesn't provide a lot of configuration options either. So if you need more than just a simple HTTP call, you will probably want to check out the advanced usage.

Simple Usage

The simple API is just some static methods modeled after the most common HTTP verbs:

#include "restclient-cpp/restclient.h"

RestClient::Response r = RestClient::get("http://url.com")
RestClient::Response r = RestClient::post("http://url.com/post", "application/json", "{\"foo\": \"bla\"}")
RestClient::Response r = RestClient::put("http://url.com/put", "application/json", "{\"foo\": \"bla\"}")
RestClient::Response r = RestClient::patch("http://url.com/patch", "application/json", "{\"foo\": \"bla\"}")
RestClient::Response r = RestClient::del("http://url.com/delete")
RestClient::Response r = RestClient::head("http://url.com")
RestClient::Response r = RestClient::options("http://url.com")

The response is of type RestClient::Response and has three attributes:

RestClient::Response.code // HTTP response code
RestClient::Response.body // HTTP response body
RestClient::Response.headers // HTTP response headers

Advanced Usage

However if you want more sophisticated features like connection reuse, timeouts or authentication, there is also a different, more configurable way.

#include "restclient-cpp/connection.h"
#include "restclient-cpp/restclient.h"

// initialize RestClient
RestClient::init();

// get a connection object
RestClient::Connection* conn = new RestClient::Connection("http://url.com");

// configure basic auth
conn->SetBasicAuth("WarMachine68", "WARMACHINEROX");

// set connection timeout to 5s
conn->SetTimeout(5);

// set custom user agent
// (this will result in the UA "foo/cool restclient-cpp/VERSION")
conn->SetUserAgent("foo/cool");

// enable following of redirects (default is off)
conn->FollowRedirects(true);
// and limit the number of redirects (default is -1, unlimited)
conn->FollowRedirects(true, 3);

// set headers
RestClient::HeaderFields headers;
headers["Accept"] = "application/json";
conn->SetHeaders(headers)

// append additional headers
conn->AppendHeader("X-MY-HEADER", "foo")

// if using a non-standard Certificate Authority (CA) trust file
conn->SetCAInfoFilePath("/etc/custom-ca.crt")

RestClient::Response r = conn->get("/get")
RestClient::Response r = conn->head("/get")
RestClient::Response r = conn->del("/delete")
RestClient::Response r = conn->options("/options")

// set different content header for POST, PUT and PATCH
conn->AppendHeader("Content-Type", "application/json")
RestClient::Response r = conn->post("/post", "{\"foo\": \"bla\"}")
RestClient::Response r = conn->put("/put", "application/json", "{\"foo\": \"bla\"}")
RestClient::Response r = conn->patch("/patch", "text/plain", "foobar")

// deinit RestClient. After calling this you have to call RestClient::init()
// again before you can use it
RestClient::disable();

The responses are again of type RestClient::Response and have three attributes:

RestClient::Response.code // HTTP response code
RestClient::Response.body // HTTP response body
RestClient::Response.headers // HTTP response headers

The connection object also provides a simple way to get some diagnostics and metrics information via conn->GetInfo(). The result is a RestClient::Connection::Info struct and looks like this:

typedef struct {
  std::string base_url;
  RestClients::HeaderFields headers;
  int timeout;
  struct {
    std::string username;
    std::string password;
  } basicAuth;

  std::string certPath;
  std::string certType;
  std::string keyPath;
  std::string keyPassword;
  std::string customUserAgent;
  std::string uriProxy;
  struct {
    // total time of the last request in seconds Total time of previous
    // transfer. See CURLINFO_TOTAL_TIME
    int totalTime;
    // time spent in DNS lookup in seconds Time from start until name
    // resolving completed. See CURLINFO_NAMELOOKUP_TIME
    int nameLookupTime;
    // time it took until Time from start until remote host or proxy
    // completed. See CURLINFO_CONNECT_TIME
    int connectTime;
    // Time from start until SSL/SSH handshake completed. See
    // CURLINFO_APPCONNECT_TIME
    int appConnectTime;
    // Time from start until just before the transfer begins. See
    // CURLINFO_PRETRANSFER_TIME
    int preTransferTime;
    // Time from start until just when the first byte is received. See
    // CURLINFO_STARTTRANSFER_TIME
    int startTransferTime;
    // Time taken for all redirect steps before the final transfer. See
    // CURLINFO_REDIRECT_TIME
    int redirectTime;
    // number of redirects followed. See CURLINFO_REDIRECT_COUNT
    int redirectCount;
  } lastRequest;
} Info;

Persistent connections/Keep-Alive

The connection object stores the curl easy handle in an instance variable and uses that for the lifetime of the object. This means curl will automatically reuse connections made with that handle.

Progress callback

Two wrapper functions are provided to setup the progress callback for uploads/downloads.

Calling conn->SetFileProgressCallback(callback) with a callback parameter matching the prototype int progress_callback(void *clientp, double dltotal, double dlnow, double ultotal, double ulnow) will setup the progress callback.

Calling conn->SetFileProgressCallbackData(data) is optional. This will set the data pointer which is the first parameter fed back to the progress callback - clientp. If this isn't set then clientp will default to the connection object conn.

// set CURLOPT_NOPROGRESS
// set CURLOPT_PROGRESSFUNCTION
conn->SetFileProgressCallback(progressFunc);
// set CURLOPT_PROGRESSDATA
conn->SetFileProgressCallbackData(data);

Write callback

A write callback function can be provided for processing data as it's received from a GET call (for instance the Kubernetes Watch API).

Calling conn->SetWriteFunction(callback) with a function parameter matching the prototype size_t write_function(void *data, size_t size, size_t nmemb, void *userdata)int progress_callback(void *clientp, double dltotal, double dlnow, double ultotal, double ulnow) will setup the write function.

Here is an example of a write callback function, processing result data line by line.

auto writeCallback = [](void *data, size_t size, size_t nmemb, void *userdata) -> size_t
{
  size_t bytes = size * nmemb;
  try
  {
      // Add to the buffer
      auto res = reinterpret_cast<RestClient::Response *>(userdata);
      res->body.append(static_cast<char*>(data), bytes);
      // If the last character is not a new line, wait for the rest.
      if ('\n' != *(res->body.end() - 1))
      {
          return bytes;
      }
      // Process data one line at a time.
      std::stringstream stream(res->body);
      std::string line;
      while (std::getline(stream, line))
      {
        // Do something with the line here...
      }
      // Done processing the line
      res->body.clear();
  }
  catch(std::exception e)
  {
      // Log caught exception here
      return 0;
  }
  return bytes;
};

Error handling

When restclient-cpp encounters an error, generally the error (or "status") code is returned in the Response (see Response struct in restclient.h). This error code can be either an HTTP error code, or if a lower-level cURL error was encountered, it may be a CURLCode. Currently, libcurl only defines 92 error codes, which means there is no overlap between cURL error codes and HTTP response codes (which start at 1xx). However, if in the future, libcurl defines more than 99 error codes, meaning that cURL errors overlap with the HTTP 1xx class of responses, restclient-cpp will return a -1 if the CURLCode is 100 or higher. In this case, callers can use GetInfo().lastRequest.curlCode to inspect the actual cURL error.

Thread Safety

restclient-cpp leans heavily on libcurl as it aims to provide a thin wrapper around it. This means it adheres to the basic level of thread safety provided by libcurl. The RestClient::init() and RestClient::disable() methods basically correspond to curl_global_init and curl_global_cleanup and thus need to be called right at the beginning of your program and before shutdown respectively. These set up the environment and are not thread-safe. After that you can create connection objects in your threads. Do not share connection objects across threads as this would mean accessing curl handles from multiple threads at the same time which is not allowed.

The connection level method SetNoSignal can be set to skip all signal handling. This is important in multi-threaded applications as DNS resolution timeouts use signals. The signal handlers quite readily get executed on other threads. Note that with this option DNS resolution timeouts do not work. If you have crashes in your multi-threaded executable that appear to be in DNS resolution, this is probably why.

In order to provide an easy to use API, the simple usage via the static methods implicitly calls the curl global functions and is therefore also not thread-safe.

HTTPS User Certificate

Simple wrapper functions are provided to allow clients to authenticate using certificates. Under the hood these wrappers set cURL options, e.g. CURLOPT_SSLCERT, using curl_easy_setopt. Note: currently libcurl compiled with gnutls (e.g. libcurl4-gnutls-dev on ubuntu) is buggy in that it returns a wrong error code when these options are set to invalid values.

// set CURLOPT_SSLCERT
conn->SetCertPath(certPath);
// set CURLOPT_SSLCERTTYPE
conn->SetCertType(type);
// set CURLOPT_SSLKEY
conn->SetKeyPath(keyPath);
// set CURLOPT_KEYPASSWD
conn->SetKeyPassword(keyPassword);

HTTP Proxy Tunneling Support

An HTTP Proxy can be set to use for the upcoming request. To specify a port number, append :[port] to the end of the host name. If not specified, libcurl will default to using port 1080 for proxies. The proxy string may be prefixed with http:// or https://. If no HTTP(S) scheme is specified, the address provided to libcurl will be prefixed with http:// to specify an HTTP proxy. A proxy host string can embedded user + password. The operation will be tunneled through the proxy as curl option CURLOPT_HTTPPROXYTUNNEL is enabled by default. A numerical IPv6 address must be written within [brackets].

// set CURLOPT_PROXY
conn->SetProxy("https://37.187.100.23:3128");
/* or you can set it without the protocol scheme and
http:// will be prefixed by default */
conn->SetProxy("37.187.100.23:3128");
/* the following request will be tunneled through the proxy */
RestClient::Response res = conn->get("/get");

Unix Socket Support

Note that the URL used with a unix socket has only ONE leading forward slash.

RestClient::Connection* conn = new RestClient::Connection("http:/v1.30");
conn->SetUnixSocketPath("/var/run/docker.sock");
RestClient::HeaderFields headers;
headers["Accept"] = "application/json; charset=UTF-8";
headers["Expect"] = "";
conn->SetHeaders(headers);
auto resp = conn->get("/images/json");

Dependencies

Installation

There are some packages available for Linux on packagecloud. And for OSX you can get it from the mrtazz/oss homebrew tap:

brew tap mrtazz/oss
brew install restclient-cpp

Otherwise you can do the regular autotools dance:

./autogen.sh
./configure
make install

Alternatively, you can build and install restclient-cpp using vcpkg dependency manager:

git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
./vcpkg install restclient-cpp

The restclient-cpp port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.

Contribute

All contributions are highly appreciated. This includes filing issues, updating documentation and writing code. Please take a look at the contributing guidelines before so your contribution can be merged as fast as possible.

Issues
  • Added a method to perform POST Form Upload

    Added a method to perform POST Form Upload

    Some REST platforms (e.g. Symphony) require a POST Form upload in some requests to send data to them. So I added code to perform post form upload.

    I created a helper object to wrap HTML form information. Then we pass it to postForm method to perform the upload.

    The unit test I wrote uses Henry's HTTP Post dumping server http://posttestserver.com/ The details of the upload of the dummy test file can be found under http://posttestserver.com/data (/[year]/[month]/[day]/restclientcpptests/)

    There's no memory leaks.

    opened by embeddedmz 30
  • Undefined reference to `RestClient::get(std::string const&)'

    Undefined reference to `RestClient::get(std::string const&)'

    Hello,

    So I installed all the files using the configure, make and make install commands. Now when I use the example I get the following error: Undefined reference to RestClient::get(std::string const&). Do you have any idea how to fix this?

    opened by Jorricks 22
  • Issue #21 - Memory leak

    Issue #21 - Memory leak

    This is my first contribution to an open source project and my first use of GitHub so if I did anything incorrectly, just delete this entire thing.

    If the remote server does not respond to the HTTP request, line 223 (for example) returns from the PUT function before doing the CURL cleanups on lines 229 thru 231. This causes a memory leak.

    I tested the following code change with the PUT function and it resolves the leak. I made changes in all functions that had similar code.

    if (res != CURLE_OK) { ret.body = "Failed to query."; ret.code = -1; //return ret; //Commented the return } else { //else added here long http_code = 0; curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code); ret.code = static_cast(http_code); } ...Followed by CURL cleanup and return statement.

    Functions now have only one return statement.

    opened by watsocd 11
  • File streaming

    File streaming

    Main content of this PR is the possibility to download and upload data directly to / from files instead of keeping it in memory in the Response object. Additionally there is a possibility to install a progress callback to track the amount of data sent or received.

    I extended the error handling a bit as well. Before the change the Response.code contains either the HTTP response code, the value of 28 (in case of a timeout), or -1 in case of other errors. I changed it to contain either the HTTP code, or a negative value containing the curl error code.

    Detailed changes:

    • Support for streaming the request body from a file and the response body to a file - useful for uploads and downloads
    • Possibility to install a progress callback
    • Added C compiler flag to use C++11 (needed for progress callback which is a std::function)
    • Added possibility to set a debug proxy for inspecting request / response traffic
    • Extended error handling: The response code contains either the HTTP code, or a negative value containing the curl error code.
    • Unit tests for the above
    • Updated README.md
    opened by wroluk 10
  • write callback and termination API

    write callback and termination API

    Description

    1. Allow write callback. Application was to use it to leverage the Kubernetes watch API which maintains a long-running connection.
    2. API to terminate connection from another thread.
    3. Fix all the disabled/broken CI tests that block the merge.

    Checklist

    Not all of these might apply to your change but the more you are able to check the easier it will be to get your contribution merged.

    • [X] CI passes
    • [X] Description of proposed change
    • [X] Documentation (README, code doc blocks, etc) is updated
    • [X] Existing issue is referenced if there is one
      • #162 write callback support
      • #161 CI does not work locally
    • [X] Unit tests for the proposed change
    opened by edwinpjacques 7
  • Empty response, no connection

    Empty response, no connection

    Hi!

    I'm using a slightly modified version of the advanced example from the README and having issues getting off the ground. Specifically, the response object returned from conn -> post(...) comes back instantly with code 500 and an empty body. The server it's supposed to be talking to receives no requests.

    The code I'm using looks like this

    Proxy::Proxy(Proxy::Settings settings)
    {
        // parse settings
        RestClient::init();
    }
    
    Proxy::~Proxy()
    {
        RestClient::disable();
    }
    
    // requests are handled by a thread pool
    Proxy::Request(...)
    {
        // translate end-user request for back-end server
        std::string workerAddress; // address to back-end server, no trailing slash
        std::string payload; // json string with escaped quotes
        
        std::unique_ptr<RestClient::Connection> conn(new RestClient::Connection(workerAddress));
        conn->SetTimeout(1);
        RestClient::HeaderFields headers;
        headers["Content-Type"] = "application/json";
        conn->SetHeaders(headers);
        RestClient::Response r = conn->post("/", payload);
    
        // translate r back to what the end-user wants
    }
    

    Environment and debugging details

    Thanks for any help in the right direction!

    opened by afiorillo 7
  • Added Cookie Feature. Now you can use Cookies with this  restClient.

    Added Cookie Feature. Now you can use Cookies with this restClient.

    With this simple expansion the Rest Client is able to use Cookies. It saves the cookies to a file 'cookie' and use it with every following request. This can be used for a simple authentification check, which should be part of a restfull service.

    opened by chfo 7
  • Debian package: undefined reference to `curl_easy_getinfo@CURL_OPENSSL_3'

    Debian package: undefined reference to `[email protected]_OPENSSL_3'

    It seems the shared library in the Debian buster package is built against libcurl3, which is not available in Debian buster.

    Source code

    #include <restclient-cpp/restclient.h>
    
    int main()
    {
        RestClient::Response r = RestClient::get("https://example.com");
    }
    

    Compile flags

    $ g++ --std=c++14 -lrestclient-cpp $(pkg-config --libs --cflags libcurl) -lpthread test.cpp
    

    Actual behaviour

    /usr/bin/ld: /tmp/ccSW6rEE.o: in function `main':
    test.cpp:(.text+0x41): undefined reference to `RestClient::get(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    

    … and so on.

    ldd output

    $ ldd /usr/lib/librestclient-cpp.so
    /usr/lib/librestclient-cpp.so: /lib/x86_64-linux-gnu/libcurl.so.4: version `CURL_OPENSSL_3' not found (required by /usr/lib/librestclient-cpp.so)
    

    Environment and debugging details

    • compiler and version
      • g++ (Debian 8.3.0-6) 8.3.0
    • operating system
      • Debian 10 (buster)
    • version of restclient-cpp
      • 0.5.1-1
    • how did you install restclient-cpp? (via packages, git, tarball)
      • Debian package for buster amd64
    • libcurl version and compile flags
      • Debian package libcurl4, version 7.64.0-4
    • full error output of your build as an inline codeblock or gist
    /usr/bin/ld: /tmp/ccejRJkF.o: in function `main':
    test.cpp:(.text+0x41): undefined reference to `RestClient::get(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/librestclient-cpp.so: undefined reference to `[email protected]_OPENSSL_3'
    collect2: error: ld returned 1 exit status
    
    debian build issues 
    opened by tastytea 6
  • use lambda's over ptr_fun

    use lambda's over ptr_fun

    ptr_fun was deprecated in C++11, and removed in C++17. lambdas have also been around since C++11. so there should be no loss in supported targets, but also adds in support for C++17 and beyond.

    opened by Mythra 6
  • Compilation on Cygwin does not build shared libraries

    Compilation on Cygwin does not build shared libraries

    Attempting to compile the library on cygwin yields the libtool error:

    libtool: warning: undefined symbols not allowed in x86_64-unknown-cygwin shared
    libraries; building static only
    

    Indeed, attempting to compile a program with the library yields a slew of reference not found errors in the vein of:

    undefined reference to `RestClient::post(std::string const&, std::string const&, 
    std::string const&)'
    relocation truncated to fit: R_X86_64_PC32 against undefined symbol `RestClient::post(
    std::string const&, std::string const&, std::string const&)'
    collect2: error: ld returned 1 exit status
    
    help wanted windows 
    opened by instigatorofawe 6
  • bundle json-cpp with restclient

    bundle json-cpp with restclient

    most REST APIs are JSON based anways. So maybe it would make this a lot nicer to use if it came with an opinionated way of how JSON responses are parsed into objects. At least look into it.

    idea 
    opened by mrtazz 6
Owner
Daniel Schauenberg
infra engineer. A Cheap Trick and a Cheesy One-Liner. git and a Makefile. Feminist.
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