ServerOption panics when fields that have been manually set are
subsequently set again. The message verbiage of `X has been set` is
unclear since `has been set` without an adverb like `already` does not
correctly convey that the fields are set-once and were previously set.
At the worst, the original verbiage `X has been set` could imply that
the new value would have been acceptable but another error occurred.
We discovered this while conducting a code survey for implementing
extensible stubs and uniform inbound interception API.
This change ensures consistency for the user when accessing metadata values:
they are never encoded except when sent on the wire. Previously, they would
appear encoded to client code, but not to server code. As such, this
represents a behavior change, but one unlikely to affect user code, as it's
unusual to inspect the metadata after setting it.
With this change, the default dialer checks environment variables to see if proxy is needed. If so, it dials to the proxy and does an HTTP CONNECT handshake.
grpclb needs to connect the second resolved balancer address when the first balancer disconnects.
If grpclb gets 2 resolved addresses: balancer1 and balancer2. When balancer1 disconnects, grpclb should automatically start to use balancer2.
* use a global sharded pool of proto.Buffer caches in protoCodec
* fix goimports
* make global buffer pool index counter atomic
* hack to remove alloc in encode_len_struct
* remove extra slice alloc in proto codec marshal
* replce magic number for proto size field length with constant
* replace custom cache with sync.Pool
* remove 1 line functions in codec.go and add protoCodec microbenchmarks
* add concurrent usage test for protoCodec
* fix golint.gofmt,goimport checks
* fix issues in codec.go and codec_test.go
* use go parallel benchmark helpers
* replace proto.Codec with a guess of size needed
* update Fatalf -> Errorf in tests
* wrap proto.Buffer along with cached last size into larger struct for pool use
* make wrapped proto buffer only a literal
* fix style and imports
* move b.Run into inner function
* reverse micro benchmark op order to unmarshal-marshal and fix benchmark setup-in-test bug
* add test for large message
* remove use of defer in codec.marshal
* revert recent changes to codec bencmarks
* move sub-benchmarks into >= go-1.7 only file
* add commentfor marshaler and tweak benchmark subtests for easier usage
* move build tag for go1.7 on benchmarks to inside file
* move build tag to top of file
* comment Codec, embed proto.Buffer into cached struct and add an int32 cap
This will prevent the incoming RPCs' metadata from appearing in outgoing RPCs
unless it is explicitly copied, e.g.:
incomingMD, ok := metadata.FromContext(ctx)
if ok {
ctx = metadata.NewContext(ctx, incomingMD)
}
Fixes#1148
So context.String() won't race when printing %#v.
It is not thread-safe to call context.String() on any context with a
stream value since valueCtx will use %#v to access all of the Stream
fields without holding a lock. Instead, print the Stream's pointer and
method for its GoString.
