* Initial envoy cgroup resource monitor implementation
* Add cgroupv1 support; add metrics instrumentation
* Slight refactor for more efficient memory limit detection
Instead of reading memory.max/limit_in_bytes on every tick, we
read it once, then again only when it is modified.
To support this change, logic for computing the saturation was moved out
of the cgroup driver and into the resource monitor, and the driver
interface now has separate methods for reading memory usage and limit.
* Code cleanup/lint fixes
* Add platform build tags
* Add unit tests
* Fix lint issues
* Add runtime flag to allow disabling resource monitor
* Clamp saturation values to the range [0.0, 1.0]
* Switch to x/sys/unix; handle inotify IN_IGNORED events
- Rename SessionState to State to avoid stutter.
- Simplified option validation to use a wrapper function for base64 secrets.
- Removed authenticates grpc code.
- Abstracted logic to load and validate a user's authenticate session.
- Removed instances of url.Parse in favor of urlutil's version.
- proxy: replaces grpc refresh logic with forced deadline advancement.
- internal/sessions: remove rest store; parse authorize header as part of session store.
- proxy: refactor request signer
- sessions: remove extend deadline (fixes#294)
- remove AuthenticateInternalAddr
- remove AuthenticateInternalAddrString
- omit type tag.Key from declaration of vars TagKey* it will be inferred
from the right-hand side
- remove compatibility package xerrors
- use cloned http.DefaultTransport as base transport
- telemetry/tace: add traces throughout code
- telemetry/metrics: nest metrics and trace under telemetry
- telemetry/tace: add service name span to HTTPMetricsHandler.
- telemetry/metrics: removed chain dependency middleware_tests.
- telemetry/metrics: wrap and encapsulate variatic view registration.
- telemetry/tace: add jaeger support for tracing.
- cmd/pomerium: move `parseOptions` to internal/config.
- cmd/pomerium: offload server handling to httputil and sub pkgs.
- httputil: standardize creation/shutdown of http listeners.
- httputil: prefer curve X25519 to P256 when negotiating TLS.
- fileutil: use standardized Getw
Signed-off-by: Bobby DeSimone <bobbydesimone@gmail.com>
