diff --git a/.cirrus.yml b/.cirrus.yml
deleted file mode 100644
index e28649926e7..00000000000
--- a/.cirrus.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-freebsd_instance:
-  image_family: freebsd-12-1
-
-task:
-  install_script: |
-    IGNORE_OSVERSION=yes pkg update
-    pkg install -U -y git boost_build boost-libs unzip wget openssl cmake ninja
-    echo "using clang ;" > ~/user-config.jam
-  submodules_script: |
-    git submodule update --init --recursive
-  build_cmake_script: |
-    cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS="-Werror" -DCMAKE_CXX_STANDARD=17 -Dbuild_tests=ON -Dbuild_examples=ON -Dbuild_tools=ON -Dpython-bindings=OFF -G Ninja .
-    cmake --build . --parallel 2
-    ./test/test_primitives
-  tests_script: |
-    cd test
-    b2 -l250 warnings-as-errors=on warnings=all crypto=openssl deterministic-tests include=/usr/local/include library-path=/usr/local/lib
-  enum_if_script: |
-    cd test
-    b2 -l250 warnings-as-errors=on warnings=all crypto=openssl stage_enum_if stage_dependencies include=/usr/local/include library-path=/usr/local/lib
-    LD_LIBRARY_PATH=./dependencies ./enum_if
diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
deleted file mode 100644
index fab43b28d98..00000000000
--- a/.github/workflows/android.yml
+++ /dev/null
@@ -1,117 +0,0 @@
-name: Android
-
-on:
-   push:
-      branches: [ RC_2_0 master ]
-   pull_request:
-
-env:
-  NDK_VERSION: "r21d"
-  OPENSSL_VERSION: "1.1.1i"
-  OPENSSL_OPTS: "no-deprecated no-shared no-makedepend -fvisibility=hidden -O3"
-
-jobs:
-
-   android_arm32_build:
-      name: Build Android Arm 32bits
-      runs-on: ubuntu-20.04
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: install boost
-        run: |
-          git clone --depth=1 --branch=boost-1.75.0 https://github.com/boostorg/boost.git
-          cd boost
-          git submodule update --init --depth=1
-          ./bootstrap.sh
-          ./b2 headers
-          cd ..
-
-      - name: install ndk
-        run: |
-          wget -nv -O android-ndk.zip https://dl.google.com/android/repository/android-ndk-${NDK_VERSION}-linux-x86_64.zip
-          unzip -qq android-ndk.zip
-          export NDK=${PWD}/android-ndk-${NDK_VERSION}
-          ${NDK}/build/tools/make_standalone_toolchain.py --arch arm --api 19 --stl libc++ --install-dir android-toolchain
-
-      - name: install openssl
-        run: |
-          export ANDROID_TOOLCHAIN=${PWD}/android-toolchain
-          export PATH=${ANDROID_TOOLCHAIN}/arm-linux-androideabi/bin:${PATH}
-          export CC=${ANDROID_TOOLCHAIN}/bin/arm-linux-androideabi-clang
-          wget -nv -O openssl.tar.gz https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz
-          tar xzf openssl.tar.gz
-          cd openssl-${OPENSSL_VERSION}
-          ./Configure linux-armv4 ${OPENSSL_OPTS} -march=armv7-a -mfpu=neon -fPIC --prefix=${PWD}/../openssl
-          make &> /dev/null
-          make install_sw &> /dev/null
-          cd ..
-
-      - name: build library
-        run: |
-          export ANDROID_TOOLCHAIN=${PWD}/android-toolchain
-          export PATH=${ANDROID_TOOLCHAIN}/arm-linux-androideabi/bin:${PATH}
-          export BOOST_ROOT=${PWD}/boost
-          export OPENSSL_ROOT=${PWD}/openssl
-          echo "boost-build ${BOOST_ROOT}/tools/build/src ;" > boost-build.jam
-          echo "using clang-linux : arm : ${ANDROID_TOOLCHAIN}/bin/arm-linux-androideabi-clang++
-          <cxxflags>-fPIC
-          <cxxflags>-march=armv7-a
-          <cxxflags>-mfpu=neon ;" >>~/user-config.jam;
-          ${BOOST_ROOT}/b2 warnings-as-errors=on cxxstd=17 toolset=clang-linux-arm target-os=android link=static crypto=openssl openssl-include=${OPENSSL_ROOT}/include openssl-lib=${OPENSSL_ROOT}/lib
-
-   android_arm32_webtorrent_build:
-      name: Build Android Arm 32bits with WebTorrent
-      runs-on: ubuntu-20.04
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: recursive
-
-      - name: install boost
-        run: |
-          git clone --depth=1 --branch=boost-1.75.0 https://github.com/boostorg/boost.git
-          cd boost
-          git submodule update --init --depth=1
-          ./bootstrap.sh
-          ./b2 headers
-          cd ..
-
-      - name: install ndk
-        run: |
-          wget -nv -O android-ndk.zip https://dl.google.com/android/repository/android-ndk-${NDK_VERSION}-linux-x86_64.zip
-          unzip -qq android-ndk.zip
-          export NDK=${PWD}/android-ndk-${NDK_VERSION}
-          ${NDK}/build/tools/make_standalone_toolchain.py --arch arm --api 28 --stl libc++ --install-dir android-toolchain
-
-      - name: install openssl
-        run: |
-          export ANDROID_TOOLCHAIN=${PWD}/android-toolchain
-          export PATH=${ANDROID_TOOLCHAIN}/arm-linux-androideabi/bin:${PATH}
-          export CC=${ANDROID_TOOLCHAIN}/bin/arm-linux-androideabi-clang
-          wget -nv -O openssl.tar.gz https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz
-          tar xzf openssl.tar.gz
-          cd openssl-${OPENSSL_VERSION}
-          ./Configure linux-armv4 ${OPENSSL_OPTS} -march=armv7-a -mfpu=neon -fPIC --prefix=${PWD}/../openssl
-          make &> /dev/null
-          make install_sw &> /dev/null
-          cd ..
-
-      - name: build library
-        run: |
-          export ANDROID_TOOLCHAIN=${PWD}/android-toolchain
-          export PATH=${ANDROID_TOOLCHAIN}/arm-linux-androideabi/bin:${PATH}
-          export BOOST_ROOT=${PWD}/boost
-          export OPENSSL_ROOT=${PWD}/openssl
-          echo "boost-build ${BOOST_ROOT}/tools/build/src ;" > boost-build.jam
-          echo "using clang-linux : arm : ${ANDROID_TOOLCHAIN}/bin/arm-linux-androideabi-clang++
-          <cxxflags>-fPIC
-          <cxxflags>-march=armv7-a
-          <cxxflags>-mfpu=neon ;" >>~/user-config.jam;
-          ${BOOST_ROOT}/b2 warnings-as-errors=on cxxstd=17 toolset=clang-linux-arm target-os=android link=static crypto=openssl openssl-include=${OPENSSL_ROOT}/include openssl-lib=${OPENSSL_ROOT}/lib webtorrent=on
diff --git a/.github/workflows/c.yml b/.github/workflows/c.yml
deleted file mode 100644
index 4bcb49cc910..00000000000
--- a/.github/workflows/c.yml
+++ /dev/null
@@ -1,68 +0,0 @@
-name: C bindings
-
-on:
-   push:
-      branches: [ RC_1_2 RC_2_0 master ]
-   pull_request:
-
-jobs:
-  test:
-    name: build
-    runs-on: ${{ matrix.os }}
-
-    strategy:
-      matrix:
-        os: [ubuntu-20.04, macos-latest, windows-2019 ]
-
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-
-    - name: dependencies (MacOS)
-      if: runner.os == 'macOS'
-      run: |
-        brew install boost-build boost
-
-    - name: update package lists (linux)
-      if: runner.os == 'Linux'
-      continue-on-error: true
-      run: |
-        sudo apt update
-
-    - name: dependencies (linux)
-      if: runner.os == 'Linux'
-      run: |
-        sudo apt install libboost-tools-dev libboost-dev libboost-system-dev
-
-    - name: install boost (windows)
-      if: runner.os == 'Windows'
-      shell: cmd
-      run: |
-        git clone --depth=1 --recurse-submodules -j10 --branch=boost-1.72.0 https://github.com/boostorg/boost.git
-        cd boost
-        bootstrap.bat
-
-    - name: boost headers (windows)
-      if: runner.os == 'Windows'
-      shell: cmd
-      run: |
-        cd boost
-        .\b2 headers
-
-    - name: build (windows)
-      if: runner.os == 'Windows'
-      shell: cmd
-      run: |
-        set BOOST_ROOT=%CD%\boost
-        set BOOST_BUILD_PATH=%BOOST_ROOT%\tools\build
-        set PATH=%BOOST_ROOT%;%PATH%
-
-        cd bindings\c
-        b2
-
-    - name: build
-      if: runner.os != 'Windows'
-      run: |
-        cd bindings/c
-        b2
diff --git a/.github/workflows/cibuildwheel.yml b/.github/workflows/cibuildwheel.yml
new file mode 100644
index 00000000000..e021bba6022
--- /dev/null
+++ b/.github/workflows/cibuildwheel.yml
@@ -0,0 +1,45 @@
+name: cibuildwheel
+
+on:
+  push:
+    branches: [ RC_1_2 RC_2_0 master ]
+  pull_request:
+
+jobs:
+  build_wheels:
+    name: cibuildwheel
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, macos-10.15, windows-2019]
+        pytag: [cp36, cp37, cp38, cp39]
+
+    env:
+       CIBW_BUILD_VERBOSITY: 1
+       CIBW_BUILD: ${{ matrix.pytag }}-*
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+
+    # "outer" python, used only to invoke cihelper and cibuildwheel
+    - uses: actions/setup-python@v2
+
+    - name: install cihelper
+      run: |
+        python -m pip install ./cihelper
+
+    - name: install cibuildwheel
+      run: |
+        python -m pip install cibuildwheel
+
+    - name: run cibuildwheel
+      run: |
+        cihelper_cibw_run --output-dir wheelhouse
+
+    - uses: actions/upload-artifact@v2
+      with:
+        path: ./wheelhouse/*.whl
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
deleted file mode 100644
index 5f7d0e5dbae..00000000000
--- a/.github/workflows/docs.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-name: Documentation
-
-on:
-   push:
-      branches: [ RC_1_2 RC_2_0 master ]
-   pull_request:
-
-jobs:
-
-   docs:
-      name: Docs
-      runs-on: ubuntu-20.04
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install dependencies
-        run: |
-          sudo apt install python-docutils python-pygments python-pil gsfonts inkscape icoutils graphviz hunspell imagemagick
-          python -m pip install aafigure
-          ~/.local/bin/aafigure --version
-
-      - name: spell-check
-        run: |
-          cd docs
-          make AAFIGURE=~/.local/bin/aafigure RST2HTML=rst2html spell-check html
-
-      - name: build docs
-        run: |
-          cd docs
-          make AAFIGURE=~/.local/bin/aafigure RST2HTML=rst2html
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
deleted file mode 100644
index ad7f1242d01..00000000000
--- a/.github/workflows/linux.yml
+++ /dev/null
@@ -1,278 +0,0 @@
-name: Linux
-
-on:
-   push:
-      branches: [ RC_1_2 RC_2_0 master ]
-   pull_request:
-
-jobs:
-
-   pre-commit:
-      # TODO: matrix across python version and os
-      runs-on: ubuntu-latest
-      steps:
-      - uses: actions/checkout@v2
-        with:
-           submodules: recursive
-      - uses: actions/setup-python@v2
-        with:
-           python-version: 3.6
-      - uses: pre-commit/action@v2.0.0
-
-   build:
-      name: build
-      runs-on: ubuntu-20.04
-      continue-on-error: true
-
-      strategy:
-         matrix:
-            config: [ asio-debugging=on picker-debugging=on, extensions=off logging=off streaming=off super-seeding=off share-mode=off predictive-pieces=off dht=off alert-msg=off encryption=off mutable-torrents=off deprecated-functions=off, crypto=gcrypt, mmap-disk-io=off ]
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install boost
-        run: |
-          sudo apt install libboost-tools-dev libboost-dev libboost-system-dev
-          echo "using gcc ;" >>~/user-config.jam
-
-      - name: install gcrypt
-        if: ${{ contains(matrix.config, 'crypto=gcrypt') }}
-        run: sudo apt install libgcrypt20-dev
-
-      - name: build library
-        run: |
-          b2 ${{ matrix.config }} cxxstd=17
-
-      - name: build examples
-        run: |
-          cd examples
-          b2 ${{ matrix.config }}
-
-      - name: build tools
-        run: |
-          cd tools
-          b2 ${{ matrix.config }} warnings-as-errors=on
-
-
-
-   fuzzers:
-      name: Fuzzers
-      runs-on: ubuntu-20.04
-      continue-on-error: true
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install boost
-        run: |
-          sudo apt install libboost-tools-dev libboost-dev libboost-system-dev
-          echo "using clang : 9 : clang++-9 ;" >>~/user-config.jam
-
-      - name: build fuzzers
-        run: |
-          cd fuzzers
-          b2 clang cxxstd=17 warnings-as-errors=on
-
-
-
-   check_headers:
-      name: check headers
-      runs-on: ubuntu-20.04
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install boost
-        run: |
-          sudo apt install libboost-tools-dev libboost-dev libboost-system-dev
-          echo "using gcc ;" >>~/user-config.jam
-
-      - name: compile header files individually
-        run: |
-          b2 check-headers cxxstd=17 warnings-as-errors=on
-
-
-
-   clang_tidy:
-      name: clang-tidy
-      runs-on: ubuntu-20.04
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install clang-tidy
-        run: sudo apt install clang-tidy libc++-dev
-
-      - name: install boost
-        run: |
-          sudo apt install libboost-tools-dev libboost-dev
-          echo "using clang_tidy : : clang-tidy \"-checks=-clang-analyzer-core.*,-clang-analyzer-unix.*\" : <cxxflags>-I/usr/local/clang-7.0.0/include/c++/v1 <cxxflags>-stdlib=libc++ <linkflags>-stdlib=libc++ ;" >> ~/user-config.jam;
-
-      - name: analyze
-        run: |
-          b2 -a clang_tidy
-
-
-
-   test:
-      name: Tests
-      runs-on: ubuntu-20.04
-      continue-on-error: true
-
-      strategy:
-         matrix:
-            include:
-               - config: webtorrent=on address-sanitizer=norecover undefined-sanitizer=norecover crypto=openssl
-               - config: toolset=clang address-sanitizer=norecover undefined-sanitizer=norecover
-               - config: thread-sanitizer=norecover crypto=openssl release debug-symbols=on
-               - config: crypto=gnutls
-               - config: deprecated-functions=off
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: recursive
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install gnutls
-        if: ${{ contains(matrix.config, 'crypto=gnutls') }}
-        run: |
-          sudo apt install libgnutls28-dev
-
-      - name: install boost
-        run: |
-          sudo apt install libboost-tools-dev libboost-dev libboost-system-dev
-          pip install websockets
-          echo "using gcc ;" >>~/user-config.jam
-          echo "using clang : 9 : clang++-9 ;" >>~/user-config.jam
-
-      - name: build and run tests
-        run: |
-          cd test
-          b2 ${{ matrix.config }} -l400 warnings-as-errors=on debug-iterators=on invariant-checks=full asserts=on deterministic-tests
-
-      - name: run tests (flaky)
-        uses: nick-invision/retry@v2
-        with:
-          timeout_minutes: 30
-          retry_wait_seconds: 4
-          max_attempts: 3
-          command: (cd test; b2 ${{ matrix.config }} -l400 warnings-as-errors=on debug-iterators=on invariant-checks=full asserts=on)
-
-
-
-   sim:
-      name: Simulations
-      runs-on: ubuntu-20.04
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install boost
-        run: |
-          sudo apt install libboost-tools-dev libboost-dev libboost-system-dev
-          echo "using gcc ;" >>~/user-config.jam
-
-      - name: build and run simulations
-        run: |
-          cd simulation
-          b2 debug-iterators=on invariant-checks=full asserts=on picker-debugging=on
-
-
-   dist:
-      name: build dist
-      runs-on: ${{ matrix.os }}
-
-      strategy:
-         matrix:
-            os: [ubuntu-20.04 ]
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: update package lists
-        continue-on-error: true
-        run: |
-          sudo apt update
-
-      - name: install dependencies
-        run: |
-          sudo apt install libboost-tools-dev libboost-python-dev libboost-dev libboost-system-dev
-          sudo apt install python-docutils python-pygments python-pil gsfonts inkscape icoutils graphviz hunspell imagemagick python3-setuptools
-          python3 -m pip install aafigure
-          echo "using gcc ;" >>~/user-config.jam
-
-      - name: build tarball
-        run: AAFIGURE=~/.local/bin/aafigure RST2HTML=rst2html make dist
-
-      - uses: actions/upload-artifact@v2
-        with:
-          name: tarball
-          path: libtorrent-rasterbar-*.tar.gz
-
-      - name: test-tarball (b2 install)
-        run: |
-          tar xvzf libtorrent-rasterbar-*.tar.gz
-          cd libtorrent-rasterbar-*/
-          b2 install cxxstd=14 --prefix=test-install-root
-          cat test-install-root/share/pkgconfig/libtorrent-rasterbar.pc
-
-      - name: test-tarball (b2 tests)
-        run: |
-          cd libtorrent-rasterbar-*/test
-          b2 testing.execute=off
-          b2 test_torrent_info
-
-      - name: test-tarball (python bindings)
-        run: |
-          cd libtorrent-rasterbar-*/
-          python3 bindings/python/setup.py build
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
deleted file mode 100644
index a328ee5d045..00000000000
--- a/.github/workflows/macos.yml
+++ /dev/null
@@ -1,124 +0,0 @@
-name: MacOS
-
-on:
-   push:
-      branches: [ RC_1_2 RC_2_0 master ]
-   pull_request:
-
-jobs:
-
-   test:
-      name: Tests
-      runs-on: macos-latest
-      continue-on-error: true
-
-      strategy:
-         matrix:
-            config: [ crypto=openssl webtorrent=on, deprecated-functions=off ]
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: recursive
-
-      - name: install boost
-        run: |
-          brew install boost-build boost
-          HOMEBREW_NO_INSTALL_CLEANUP=1 brew reinstall openssl@1.1
-          pip3 install websockets
-          echo "using darwin ;" >>~/user-config.jam
-
-      - name: build and run tests
-        run: (cd test; b2 ${{ matrix.config }} -l400 warnings-as-errors=on debug-iterators=on invariant-checks=full asserts=on deterministic-tests)
-
-      - name: run tests (flaky)
-        uses: nick-invision/retry@v2
-        with:
-          timeout_minutes: 30
-          retry_wait_seconds: 1
-          max_attempts: 3
-          command: (cd test; b2 ${{ matrix.config }} -l400 warnings-as-errors=on debug-iterators=on invariant-checks=full asserts=on)
-
-
-   sim:
-      name: Simulations
-      runs-on: macos-latest
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: install boost
-        run: |
-          brew install boost-build boost
-          echo "using darwin ;" >>~/user-config.jam
-
-      - name: build and run simulations
-        run: |
-          cd simulation
-          b2 -l400 debug-iterators=on invariant-checks=full asserts=on
-
-
-   build:
-      name: Build
-      runs-on: macos-latest
-      continue-on-error: true
-
-      strategy:
-         matrix:
-            config: [ crypto=openssl, release ]
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: install boost
-        run: |
-          brew install openssl boost-build boost
-          echo "using darwin ;" >>~/user-config.jam
-
-      - name: build library
-        run: |
-          b2 ${{ matrix.config }} -l400 warnings-as-errors=on cxxstd=14
-
-
-   ios_build:
-      name: Build iOS
-      runs-on: macos-latest
-      continue-on-error: true
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: install boost
-        run: |
-          brew install boost-build boost
-          echo "using darwin : ios_sim : clang++ : <compileflags>-Wno-deprecated-declarations
-          <compileflags>\"-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk\"
-          <compileflags>-mios-simulator-version-min=7
-          <compileflags>-fobjc-abi-version=2
-          <linkflags>\"-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk\"
-          <linkflags>-mios-simulator-version-min=7
-          <linkflags>-fobjc-abi-version=2 ;" >>~/user-config.jam;
-
-          echo "using darwin : ios : clang++ : <compileflags>-Wno-deprecated-declarations
-          <compileflags>\"-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk\"
-          <compileflags>-mios-version-min=7
-          <compileflags>\"-arch armv7\"
-          <compileflags>-fobjc-abi-version=2
-          <linkflags>\"-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk\"
-          <linkflags>-mios-version-min=7
-          <linkflags>\"-arch armv7\"
-          <linkflags>-fobjc-abi-version=2 ;" >>~/user-config.jam;
-
-      - name: build library
-        run: |
-          b2 -l400 warnings-as-errors=on cxxstd=14 darwin-ios darwin-ios_sim link=static
diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
deleted file mode 100644
index bf5d2a265f9..00000000000
--- a/.github/workflows/python.yml
+++ /dev/null
@@ -1,90 +0,0 @@
-name: Python bindings
-
-on:
-   push:
-      branches: [ RC_1_2 RC_2_0 master ]
-   pull_request:
-
-jobs:
-  test:
-    name: build
-    runs-on: ${{ matrix.os }}
-
-    strategy:
-      # on linux and mac, the boost libraries are fixed to a python version.
-      # since we install boost from repos on those systems, we must use the
-      # matching python versions
-      matrix:
-        include:
-          - os: ubuntu-20.04
-            python-version: 3.8
-          - os: macos-latest
-            python-version: 3.9
-          - os: windows-2019
-            python-version: 3.6
-
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-
-    # Note:
-    #  - on mac and linux images, 'python' is python2 and 'python3' is
-    #    python3
-    #  - on windows, neither 'python' nor 'python3' is in PATH by default
-    #  - setup-python sets up PATH so 'python' and 'python3' point to the
-    #    requested version on mac and linux, but on windows it only sets up
-    #    'python'.
-    - uses: actions/setup-python@v2
-      with:
-         python-version: ${{ matrix.python-version }}
-
-    - name: install tox
-      run: |
-        python3 -m pip install --upgrade pip
-        python3 -m pip install --upgrade tox
-
-    - name: dependencies (MacOS)
-      if: runner.os == 'macOS'
-      run: |
-        brew install boost-build boost boost-python3
-
-    - name: update package lists (linux)
-      if: runner.os == 'Linux'
-      continue-on-error: true
-      run: |
-        sudo apt update
-
-    - name: dependencies (linux)
-      if: runner.os == 'Linux'
-      run: |
-        sudo apt install libboost-tools-dev libboost-python-dev libboost-dev libboost-system-dev
-
-    - name: install boost (windows)
-      if: runner.os == 'Windows'
-      shell: cmd
-      run: |
-        git clone --depth=1 --recurse-submodules -j10 --branch=boost-1.72.0 https://github.com/boostorg/boost.git
-        cd boost
-        bootstrap.bat
-
-    - name: boost headers (windows)
-      if: runner.os == 'Windows'
-      shell: cmd
-      run: |
-        cd boost
-        .\b2 headers
-
-    - name: build/test with tox (windows)
-      if: runner.os == 'Windows'
-      shell: cmd
-      run: |
-        set BOOST_ROOT=%CD%\boost
-        set PATH=%BOOST_ROOT%;%PATH%
-        set PYTHON_INTERPRETER=python
-        tox -e py
-
-    - name: build/test with tox
-      if: runner.os != 'Windows'
-      run: |
-        tox -e py
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
deleted file mode 100644
index f55d0f46ed7..00000000000
--- a/.github/workflows/windows.yml
+++ /dev/null
@@ -1,171 +0,0 @@
-name: Windows
-
-on:
-   push:
-      branches: [ RC_1_2 RC_2_0 master ]
-   pull_request:
-
-defaults:
-   run:
-      shell: cmd
-
-jobs:
-
-   tests:
-      name: Test
-      runs-on: windows-2019
-      continue-on-error: true
-
-      strategy:
-         matrix:
-           include:
-             - config: address-model=32
-             - config: address-model=64 crypto=openssl openssl-lib=vcpkg\installed\x64-windows\lib\ openssl-include=vcpkg\installed\x64-windows\include
-             - config: release
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      # we only build with openssl on 64 bit. The github action images comes
-      # with openssl pre-installed, but only the 64 bit version and there's no
-      # naming convention to separate the two. When building the 32 bit version
-      # it appears it still picks up the 64 bit DLL, and fails.
-      - name: install openssl (64 bit)
-        if: ${{ contains(matrix.config, 'crypto=openssl') }}
-        uses: lukka/run-vcpkg@v6
-        with:
-          vcpkgArguments: 'openssl'
-          vcpkgTriplet: 'x64-windows'
-          vcpkgDirectory: '${{ github.workspace }}/vcpkg'
-          vcpkgGitCommitId: 0bf3923f9fab4001c00f0f429682a0853b5749e0
-
-      - name: install boost
-        run: |
-          git clone --depth=1 --recurse-submodules -j10 --branch=boost-1.72.0 https://github.com/boostorg/boost.git
-          cd boost
-          bootstrap.bat
-
-      - name: boost headers
-        run: |
-          cd boost
-          .\b2 headers
-
-      - name: tests (deterministic)
-        run: |
-          set BOOST_ROOT=%CD%\boost
-          set PATH=%BOOST_ROOT%;%PATH%
-          set PYTHON_INTERPRETER=python
-          cd test
-          b2 -l400 warnings=all warnings-as-errors=on ${{ matrix.config }} deterministic-tests
-
-
-      - name: tests (flaky)
-        run: |
-          set BOOST_ROOT=%CD%\boost
-          set PATH=%BOOST_ROOT%;%PATH%
-          set PYTHON_INTERPRETER=python
-          cd test
-          set c=3
-          :retry
-          if %c%==0 exit /B 1
-          set /a c = %c% -1
-          b2 -l400 warnings=all warnings-as-errors=on ${{ matrix.config }}
-          if %errorlevel%==0 exit /B 0
-          if %c% gtr 0 goto retry
-          exit /B 1
-
-   simulations:
-      name: Simulations
-      runs-on: windows-2019
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: install boost
-        run: |
-          git clone --depth=1 --recurse-submodules -j10 --branch=boost-1.72.0 https://github.com/boostorg/boost.git
-          cd boost
-          bootstrap.bat
-
-      - name: boost headers
-        run: |
-          cd boost
-          .\b2 headers
-
-  # debug iterators are turned off here because msvc has issues with noexcept
-  # specifiers when debug iterators are enabled. Specifically, constructors that
-  # allocate memory are still marked as noexcept. That results in program
-  # termination
-  # the IOCP backend in asio appears to have an issue where it hangs under
-  # certain unexpected terminations (through exceptions)
-      - name: build sims
-        run: |
-          set BOOST_ROOT=%CD%\boost
-          set PATH=%BOOST_ROOT%;%PATH%
-          cd simulation
-          b2 --hash address-model=64 link=static debug-iterators=off invariant-checks=on crypto=built-in define=BOOST_ASIO_DISABLE_IOCP asserts=on testing.execute=off
-
-      - name: run sims
-        run: |
-          set BOOST_ROOT=%CD%\boost
-          set PATH=%BOOST_ROOT%;%PATH%
-          cd simulation
-          b2 --hash -l500 address-model=64 link=static debug-iterators=off invariant-checks=on crypto=built-in define=BOOST_ASIO_DISABLE_IOCP asserts=on
-
-   build:
-      name: Build
-      runs-on: windows-2019
-      continue-on-error: true
-
-      strategy:
-         matrix:
-           include:
-             - config: asio-debugging=on picker-debugging=on windows-version=vista
-             - config: windows-api=store windows-version=win10
-             - config: deprecated-functions=off
-
-      steps:
-      - name: checkout
-        uses: actions/checkout@v2.3.3
-        with:
-           submodules: true
-
-      - name: install boost
-        run: |
-          git clone --depth=1 --recurse-submodules -j10 --branch=boost-1.72.0 https://github.com/boostorg/boost.git
-          cd boost
-          bootstrap.bat
-
-      - name: boost headers
-        run: |
-          cd boost
-          .\b2 headers
-
-      - name: build library
-        run: |
-          set BOOST_ROOT=%CD%\boost
-          set PATH=%BOOST_ROOT%;%PATH%
-          b2 ${{ matrix.config }} cxxstd=17 warnings=all warnings-as-errors=on
-
-      - name: build examples
-        if: ${{ ! contains(matrix.config, 'windows-api=store') }}
-        run: |
-          set BOOST_ROOT=%CD%\boost
-          set PATH=%BOOST_ROOT%;%PATH%
-          cd examples
-          b2 ${{ matrix.config }} warnings=all warnings-as-errors=on
-
-      - name: build tools
-        if: ${{ ! contains(matrix.config, 'windows-api=store') }}
-        run: |
-          set BOOST_ROOT=%CD%\boost
-          set PATH=%BOOST_ROOT%;%PATH%
-          cd tools
-          b2 ${{ matrix.config }} warnings=all warnings-as-errors=on
-
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 6d2232abfc1..00000000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,113 +0,0 @@
-version: "{build}"
-branches:
-  only:
-    - master
-    - RC_2_0
-    - RC_1_2
-    - RC_1_1
-image: Visual Studio 2019
-clone_depth: 1
-environment:
-  matrix:
-    - variant: debug
-      compiler: gcc
-      model: 32
-      crypto: openssl
-      ssl_lib: /usr/local/include
-      ssl_include: /usr/local/lib
-      lib: 1
-    - cmake: 1
-      crypto: openssl
-      ssl_root_dir: c:\OpenSSL-v111-Win64
-      webtorrent: on
-    - variant: release
-      compiler: msvc
-      model: 64
-      crypto: openssl
-      ssl_lib: c:\OpenSSL-v111-Win64\lib
-      ssl_include: c:\OpenSSL-v111-Win64\include
-      webtorrent: on
-      tests: 1
-
-artifacts:
-  - path: bindings/python/dist/*
-    name: python-module
-
-install:
-  - git submodule update --init --recursive
-  - set ROOT_DIRECTORY=%CD%
-  - cd %ROOT_DIRECTORY%
-  - if not defined api ( set api="desktop" )
-  - if not defined compiler ( set compiler="" )
-  - if not defined linking ( set linking="shared" )
-  - if not defined crypto ( set crypto=built-in )
-  - if not defined webtorrent ( set webtorrent=off )
-  - if not defined ssl_lib ( set ssl_lib=c:\ )
-  - if not defined ssl_include ( set ssl_include=c:\ )
-  - if not defined ssl_root_dir ( set ssl_root_dir=c:\ )
-  - cd %ROOT_DIRECTORY%
-  - set BOOST_ROOT=c:\Libraries\boost_1_71_0
-  - set BOOST_BUILD_PATH=%BOOST_ROOT%\tools\build
-  - echo %BOOST_ROOT%
-  - echo %BOOST_BUILD_PATH%
-  - set PATH=%PATH%;%BOOST_BUILD_PATH%
-  - ps: '"using msvc ;`nusing python : 3.6 : c:\\Python36-x64 : c:\\Python36-x64\\include : c:\\Python36-x64\\libs ;`n" | Set-Content $env:HOMEDRIVE\$env:HOMEPATH\user-config.jam'
-  - type %HOMEDRIVE%%HOMEPATH%\user-config.jam
-  - cd %ROOT_DIRECTORY%
-  - set PATH=c:\Python36-x64;%PATH%
-  - set PYTHON_INTERPRETER=c:\Python36-x64\python.exe
-  - python --version
-  - python -m pip install websockets
-  - echo %ROOT_DIRECTORY%
-  - cd %BOOST_BUILD_PATH%
-  - bootstrap.bat >nul
-  - cd %ROOT_DIRECTORY%
-
-build_script:
-
-  # just the library
-  - cd %ROOT_DIRECTORY%
-  - if defined lib (
-    b2.exe --hash openssl-lib=%ssl_lib% openssl-include=%ssl_include% warnings=all warnings-as-errors=on %compiler% address-model=%model% picker-debugging=on invariant-checks=full variant=%variant% link=shared crypto=%crypto% webtorrent=%webtorrent% asserts=on export-extra=on windows-api=%api% windows-version=win10 cxxstd=17
-    )
-
-  # test
-  - cd %ROOT_DIRECTORY%\test
-  - if defined tests (
-    b2.exe --hash openssl-lib=%ssl_lib% openssl-include=%ssl_include% warnings=all warnings-as-errors=on %compiler% address-model=%model% picker-debugging=on invariant-checks=full variant=%variant% link=shared crypto=%crypto% webtorrent=%webtorrent% asserts=on export-extra=on windows-api=%api% windows-version=win10 testing.execute=off
-    )
-
-  # python binding
-  - cd %ROOT_DIRECTORY%\bindings\python
-  # we use 64 bit python builds
-  # boost.python itself doesn't build warning free, so we can't build
-  # with warnings-as-errors
-  - if defined python (
-    b2.exe --hash openssl-lib=%ssl_lib% openssl-include=%ssl_include% warnings=all %compiler% address-model=%model% picker-debugging=on invariant-checks=full variant=%variant% link=shared crypto=%crypto% webtorrent=%webtorrent% asserts=on export-extra=on windows-api=%api% windows-version=win10 libtorrent-link=shared stage_module stage_dependencies
-    )
-  - if defined python_dist (
-    c:\Python36-x64\python.exe setup.py bdist --format=msi
-    )
-
-  # minimal support for cmake build
-  # we need to build the boost libraries we use with C++17
-  # and stage it for cmake to pick up
-  - if defined cmake (
-    cd %BOOST_ROOT% &&
-    b2.exe cxxstd=17 release --with-python --with-system --layout=system address-model=64 link=shared stage &&
-    cd %ROOT_DIRECTORY% &&
-    mkdir build &&
-    cd build &&
-    cmake -DBOOST_LIBRARYDIR=%BOOST_ROOT%\stage\lib -DCMAKE_CXX_STANDARD=17 -Dbuild_tests=ON -Dbuild_examples=ON -Dbuild_tools=ON -Dwebtorrent=%webtorrent% -DOPENSSL_ROOT_DIR=%ssl_root_dir% -Dpython-bindings=%python% -Dboost-python-module-name="python" -Dskip-python-runtime-test=true -DPython_ADDITIONAL_VERSIONS="2.7" -G "Visual Studio 16 2019" -A x64 .. &&
-    cmake --build . --config Release --parallel %NUMBER_OF_PROCESSORS% -- -verbosity:minimal
-    )
-
-test_script:
-  - cd %ROOT_DIRECTORY%\test
-  - if defined tests (
-    appveyor-retry b2.exe -l500 --hash openssl-lib=%ssl_lib% openssl-include=%ssl_include% warnings=all warnings-as-errors=on %compiler% address-model=%model% picker-debugging=on invariant-checks=full variant=%variant% link=shared crypto=%crypto% webtorrent=%webtorrent% asserts=on export-extra=on windows-api=%api% windows-version=win10 deterministic-tests
-    )
-
-  - if defined cmake (
-    appveyor-retry ctest
-    )
diff --git a/cihelper/cihelper/__init__.py b/cihelper/cihelper/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/cihelper/cihelper/boost.py b/cihelper/cihelper/boost.py
new file mode 100644
index 00000000000..49949b9ea27
--- /dev/null
+++ b/cihelper/cihelper/boost.py
@@ -0,0 +1,71 @@
+import contextlib
+import logging
+import os
+import os.path
+import pathlib
+import sys
+import tarfile
+import urllib.request
+
+from . import common
+
+_LOG = logging.getLogger(__name__)
+
+
+def get_version() -> str:
+    return os.environ.get("CIHELPER_BOOST_VERSION", "1.76.0")
+
+
+def get_root() -> pathlib.Path:
+    # bootstrap.sh doesn't support being run from a dir with spaces
+    assert " " not in str(common.get_base()), common.get_base()
+    vunder = get_version().replace(".", "_")
+    return common.get_base() / f"boost_{vunder}"
+
+
+def get_archive_url(suffix: str) -> str:
+    version = get_version()
+    vunder = version.replace(".", "_")
+    return (
+        "https://boostorg.jfrog.io/artifactory/main/release/"
+        f"{version}/source/boost_{vunder}{suffix}"
+    )
+
+
+def download_and_extract() -> None:
+    # This is pure-python but slow
+    url = get_archive_url(".tar.bz2")
+    _LOG.debug("requesting: %s", url)
+    resp = urllib.request.urlopen(url)
+    tar = tarfile.open(mode="r|bz2", fileobj=resp)
+    with contextlib.closing(tar):
+        # will populate /<base>/boost_x_y_z
+        _LOG.debug("extracting to: %s", common.get_base())
+        common.get_base().mkdir(parents=True, exist_ok=True)
+        tar.extractall(path=str(common.get_base()))
+
+
+def bootstrap() -> None:
+    if sys.platform == "win32":
+        exe = get_root() / "bootstrap.bat"
+    else:
+        exe = get_root() / "bootstrap.sh"
+    common.check_call([exe], cwd=get_root())
+    config = get_root() / "project-config.jam"
+    _LOG.info("contents of %s:\n%s", config, config.read_text())
+    common.check_call(
+        [get_root() / "b2", f"-j{common.get_jobs()}", "headers"], cwd=get_root()
+    )
+
+
+def install() -> None:
+    _LOG.info("PATH = %r", os.environ["PATH"])
+    if get_root().is_dir():
+        return
+    download_and_extract()
+    bootstrap()
+
+
+def install_cmd() -> None:
+    common.configure_logger()
+    install()
diff --git a/cihelper/cihelper/cibw.py b/cihelper/cihelper/cibw.py
new file mode 100644
index 00000000000..5363c290cad
--- /dev/null
+++ b/cihelper/cihelper/cibw.py
@@ -0,0 +1,96 @@
+import logging
+import os
+import runpy
+import shlex
+import sys
+
+from . import common
+from . import env
+
+_LOG = logging.getLogger(__name__)
+
+
+def set_env(name: str, value: str) -> None:
+    _LOG.info("set %s = %r", name, value)
+    os.environ[name] = value
+
+
+def append_inner_env(name: str, value: str) -> None:
+    existing = os.environ.get("CIBW_ENVIRONMENT", "")
+    set_env("CIBW_ENVIRONMENT", f"{existing} {name}={value}")
+
+
+def setup_env() -> None:
+    if sys.platform == "linux":
+        # cibuildwheel will invoke docker.
+
+        # Our homedir-based install paths will be different in the container.
+        # Set this *now*, so we calculate other paths correctly
+        set_env("CIHELPER_BASE", "/cihelper")
+        # *Also* set in CIBW_ENVIRONMENT so paths are calculated the same
+        # way inside docker
+        append_inner_env("CIHELPER_BASE", "/cihelper")
+
+        # We'll need to install cihelper in the container
+        set_env(
+            "CIBW_BEFORE_ALL",
+            "python -m pip install ./cihelper && cihelper_boost_install",
+        )
+
+        # As of writing:
+        #  - manylinux2010 has g++ ??
+        #  - manylinux2014 has g++ ??
+        #  - manylinux_2_24 has g++ 6.3.0
+        set_env("CIBW_MANYLINUX_X86_64_IMAGE", "manylinux2014")
+        set_env("CIBW_MANYLINUX_I686_IMAGE", "manylinux2014")
+
+        # Supply our env variables
+        for name, value in env.get().items():
+            # We've already figured exact values we want. We *don't* want
+            # cibuildwheel to do any expansion. shlex-quote will defend against
+            # this.
+            append_inner_env(name, shlex.quote(value))
+
+        # Supply our PATH entries
+        path = list(env.get_path())
+        if path:
+            value = os.pathsep.join(path + ["$PATH"])
+            # We *do* want cibuildwheel to do expansion, for $PATH. I can't find a
+            # way to tell cibuildwheel to expand $PATH but not perform expansion
+            # on the other paths we're supplying; hopefully they don't contain
+            # variable names.
+            append_inner_env("PATH", f'"{value}"')
+    else:
+        # cibuildwheel will build the wheel nakedly.
+        # Do *not* install cihelper, because it's already installed (it's
+        # running this script!)
+        set_env("CIBW_BEFORE_ALL", "cihelper_boost_install")
+
+        # cibuildwheel's environment variable expansion seems to stomp on \, so
+        # with CIBW_ENVIRONMENT=PATH="c:\foo;$PATH", PATH becomes "c:foo;...".
+        # Not sure if the intent is that we just manipulate PATH directly on
+        # Windows since we run nakedly. That seems the best answer for now
+        # so that's what we do.
+        for name, value in env.get().items():
+            set_env(name, value)
+        path = list(env.get_path())
+        if path:
+            set_env("PATH", os.pathsep.join(path + [os.environ["PATH"]]))
+
+    # This would normally be in root files like setup.cfg or setup.py, but all
+    # our files are in bindings/python so cibuildwheel can't figure it out on
+    # its own
+    set_env("CIBW_PROJECT_REQUIRES_PYTHON", ">=3.6")
+    # Per https://cibuildwheel.readthedocs.io/en/stable/cpp_standards/, 10.14
+    # is required for full C++17 support
+    set_env("MACOSX_DEPLOYMENT_TARGET", "10.14")
+
+
+def run() -> None:
+    setup_env()
+    runpy.run_module("cibuildwheel", run_name="__main__")
+
+
+def run_cmd() -> None:
+    common.configure_logger()
+    run()
diff --git a/cihelper/cihelper/common.py b/cihelper/cihelper/common.py
new file mode 100644
index 00000000000..185db1a8d27
--- /dev/null
+++ b/cihelper/cihelper/common.py
@@ -0,0 +1,53 @@
+import logging
+import multiprocessing
+import os
+import pathlib
+import subprocess
+import sys
+from typing import Sequence
+from typing import Union
+
+import appdirs
+
+_LOG = logging.getLogger(__name__)
+
+
+def configure_logger() -> None:
+    logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)
+
+
+def get_jobs() -> int:
+    return multiprocessing.cpu_count() + 1
+
+
+_AnyPath = Union[str, os.PathLike]
+
+
+# The real check_call has a huge list of parameters, just copy the ones we use
+def check_call(cmd: Sequence[_AnyPath], *, cwd: _AnyPath) -> None:
+    _LOG.info("+ %s", cmd)
+    subprocess.check_call(cmd, cwd=cwd, stdout=sys.stdout, stderr=sys.stderr)
+
+
+def get_appdirs() -> appdirs.AppDirs:
+    return appdirs.AppDirs(appname="cihelper")
+
+
+def get_base() -> pathlib.Path:
+    base = os.environ.get("CIHELPER_BASE")
+    if base:
+        return pathlib.Path(base)
+    # boost's bootstrap.sh (and maybe others) break if run from a dir with
+    # spaces in the name. On OSX, user_data_dir includes "Application Support".
+    # work around this by trying several dirs.
+    dirs = get_appdirs()
+    for path in (
+        dirs.user_data_dir,
+        dirs.user_cache_dir,
+        dirs.user_state_dir,
+        dirs.user_config_dir,
+    ):
+        if " " not in path:
+            return pathlib.Path(path)
+    # fallback to user_data_dir
+    return pathlib.Path(dirs.user_data_dir)
diff --git a/cihelper/cihelper/env.py b/cihelper/cihelper/env.py
new file mode 100644
index 00000000000..a19969390f7
--- /dev/null
+++ b/cihelper/cihelper/env.py
@@ -0,0 +1,14 @@
+from typing import Mapping
+from typing import Sequence
+
+from . import boost
+
+
+def get() -> Mapping[str, str]:
+    return {
+        "BOOST_ROOT": str(boost.get_root()),
+    }
+
+
+def get_path() -> Sequence[str]:
+    return [str(boost.get_root())]
diff --git a/cihelper/pyproject.toml b/cihelper/pyproject.toml
new file mode 100644
index 00000000000..9e98b626978
--- /dev/null
+++ b/cihelper/pyproject.toml
@@ -0,0 +1,6 @@
+[project]
+requires-python = ">=3.6"
+
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
diff --git a/cihelper/setup.cfg b/cihelper/setup.cfg
new file mode 100644
index 00000000000..b906a5f34d1
--- /dev/null
+++ b/cihelper/setup.cfg
@@ -0,0 +1,15 @@
+[metadata]
+name = cihelper
+version = 0.0.1
+description = helpers for libtorrent CI
+
+[options]
+python_requires = >=3.6
+packages = find:
+install_requires =
+    appdirs
+
+[options.entry_points]
+console_scripts =
+    cihelper_boost_install = cihelper.boost:install_cmd
+    cihelper_cibw_run = cihelper.cibw:run_cmd