Add instrumentation for httpd - Apache HTTP Server

instrumentation/httpd/.bazelversion

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+3.7.2

instrumentation/httpd/.clang-format

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+# See Clang docs: http://clang.llvm.org/docs/ClangFormatStyleOptions.html
+BasedOnStyle: Chromium
+
+# Allow double brackets such as std::vector<std::vector<int>>.
+Standard: Cpp11
+
+# Indent 2 spaces at a time.
+IndentWidth: 2
+
+# Keep lines under 100 columns long.
+ColumnLimit: 100
+
+# Always break before braces
+BreakBeforeBraces: Custom
+BraceWrapping:
+#  TODO(lujc) wait for clang-format-9 support in Chromium tools
+#  AfterCaseLabel: true
+  AfterClass: true
+  AfterControlStatement: true
+  AfterEnum: true
+  AfterFunction: true
+  AfterNamespace: true
+  AfterStruct: true
+  AfterUnion: true
+  BeforeCatch: true
+  BeforeElse: true
+  IndentBraces: false
+  SplitEmptyFunction: false
+  SplitEmptyRecord: false
+  SplitEmptyNamespace: false
+
+  # Keeps extern "C" blocks unindented.
+  AfterExternBlock: false
+
+# Indent case labels.
+IndentCaseLabels: true
+
+# Right-align pointers and references
+PointerAlignment: Right
+
+# ANGLE likes to align things as much as possible.
+AlignOperands: true
+AlignConsecutiveAssignments: true
+
+# Use 2 space negative offset for access modifiers
+AccessModifierOffset: -2
+
+# TODO(jmadill): Decide if we want this on. Doesn't have an "all or none" mode.
+AllowShortCaseLabelsOnASingleLine: false
+
+# Useful for spacing out functions in classes
+KeepEmptyLinesAtTheStartOfBlocks: true
+
+# Indent nested PP directives.
+IndentPPDirectives: AfterHash
+
+# Include blocks style
+IncludeBlocks: Preserve

instrumentation/httpd/.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: Build module
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+      - name: Setup buildtools
+        run: |
+          sudo ./setup-buildtools.sh
+          sudo ./setup_environment.sh
+      - name: Compile
+        run: ./build.sh
+
+  clang_format:
+    name: Check code formatting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+      - name: Setup formatting tool (clang)
+        run: |
+          sudo ./tools/setup-tools.sh code
+      - name: Check formatting
+        run: ./tools/format-code.sh
+
+  build_format:
+    name: Check build formatting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+      - name: Setup formatting tool (buildifier)
+        run: |
+          sudo ./tools/setup-tools.sh buildifier
+      - name: Check formatting
+        run: ./tools/format-bazel.sh
+
+  e2e_tests:
+    name: Run end-to-end tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+      - name: Setup buildtools
+        run: |
+          sudo ./tests/setup-tools.sh
+          sudo ./setup-buildtools.sh
+          sudo ./setup_environment.sh
+      - name: Compile
+        run: ./build.sh
+      - name: Run tests
+        run: |
+          ./create-otel-load.sh
+          sudo ./httpd_install_otel.sh
+          cd tests && sudo ./run-all.sh

instrumentation/httpd/.gitignore

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+# Ref. https://github.com/github/gitignore/blob/master/C%2B%2B.gitignore
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+# Bazel files
+/bazel-*
+
+# Mac
+.DS_Store
+
+# Output directories
+/out
+/out.*
+# Indicator that the tools were deployed
+.buildtools

instrumentation/httpd/BUILD

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+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+package(default_visibility = ["//visibility:public"])
+
+cc_binary(
+    name = "otel.so",
+    linkshared = 1,
+    deps = [
+        "//src/otel:otelmodlib",
+    ],
+)

instrumentation/httpd/Dockerfile

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+FROM ubuntu:18.04
+
+#########################################
+# copy setup stuff from opentelemetry-cpp
+#########################################
+
+WORKDIR /setup-ci
+
+ADD setup-buildtools.sh /setup-ci/setup-buildtools.sh
+
+RUN /setup-ci/setup-buildtools.sh
+
+#########################
+# now build plugin itself
+#########################
+
+ADD setup_environment.sh /setup/setup_environment.sh
+
+RUN /setup/setup_environment.sh
+
+COPY src /root/src
+COPY .clang-format /root
+COPY tools /root/tools
+
+COPY .bazelversion /root
+COPY BUILD /root
+COPY WORKSPACE /root
+
+WORKDIR /root
+COPY create-otel-load.sh /root
+COPY build.sh /root
+COPY opentelemetry.conf /root
+COPY httpd_install_otel.sh /root
+RUN /root/build.sh
+
+# TODO: check apache configuration (apachectl configtest)
+
+# TODO: run tests?