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speech_client.go
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speech_client.go
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// Copyright 2017, Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// AUTO-GENERATED CODE. DO NOT EDIT.
package speech
import (
"time"
"cloud.google.com/go/internal/version"
"cloud.google.com/go/longrunning"
lroauto "cloud.google.com/go/longrunning/autogen"
gax "github.com/googleapis/gax-go"
"golang.org/x/net/context"
"google.golang.org/api/option"
"google.golang.org/api/transport"
speechpb "google.golang.org/genproto/googleapis/cloud/speech/v1beta1"
longrunningpb "google.golang.org/genproto/googleapis/longrunning"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
// CallOptions contains the retry settings for each method of Client.
type CallOptions struct {
SyncRecognize []gax.CallOption
AsyncRecognize []gax.CallOption
StreamingRecognize []gax.CallOption
}
func defaultClientOptions() []option.ClientOption {
return []option.ClientOption{
option.WithEndpoint("speech.googleapis.com:443"),
option.WithScopes(DefaultAuthScopes()...),
}
}
func defaultCallOptions() *CallOptions {
retry := map[[2]string][]gax.CallOption{
{"default", "idempotent"}: {
gax.WithRetry(func() gax.Retryer {
return gax.OnCodes([]codes.Code{
codes.DeadlineExceeded,
codes.Unavailable,
}, gax.Backoff{
Initial: 100 * time.Millisecond,
Max: 60000 * time.Millisecond,
Multiplier: 1.3,
})
}),
},
}
return &CallOptions{
SyncRecognize: retry[[2]string{"default", "idempotent"}],
AsyncRecognize: retry[[2]string{"default", "idempotent"}],
StreamingRecognize: retry[[2]string{"default", "non_idempotent"}],
}
}
// Client is a client for interacting with Google Cloud Speech API.
type Client struct {
// The connection to the service.
conn *grpc.ClientConn
// The gRPC API client.
client speechpb.SpeechClient
// LROClient is used internally to handle longrunning operations.
// It is exposed so that its CallOptions can be modified if required.
// Users should not Close this client.
LROClient *lroauto.OperationsClient
// The call options for this service.
CallOptions *CallOptions
// The metadata to be sent with each request.
xGoogHeader []string
}
// NewClient creates a new speech client.
//
// Service that implements Google Cloud Speech API.
func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
conn, err := transport.DialGRPC(ctx, append(defaultClientOptions(), opts...)...)
if err != nil {
return nil, err
}
c := &Client{
conn: conn,
CallOptions: defaultCallOptions(),
client: speechpb.NewSpeechClient(conn),
}
c.SetGoogleClientInfo()
c.LROClient, err = lroauto.NewOperationsClient(ctx, option.WithGRPCConn(conn))
if err != nil {
// This error "should not happen", since we are just reusing old connection
// and never actually need to dial.
// If this does happen, we could leak conn. However, we cannot close conn:
// If the user invoked the function with option.WithGRPCConn,
// we would close a connection that's still in use.
// TODO(pongad): investigate error conditions.
return nil, err
}
return c, nil
}
// Connection returns the client's connection to the API service.
func (c *Client) Connection() *grpc.ClientConn {
return c.conn
}
// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *Client) Close() error {
return c.conn.Close()
}
// SetGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *Client) SetGoogleClientInfo(keyval ...string) {
kv := append([]string{"gl-go", version.Go()}, keyval...)
kv = append(kv, "gapic", version.Repo, "gax", gax.Version, "grpc", grpc.Version)
c.xGoogHeader = []string{gax.XGoogHeader(kv...)}
}
// SyncRecognize performs synchronous speech recognition: receive results after all audio
// has been sent and processed.
func (c *Client) SyncRecognize(ctx context.Context, req *speechpb.SyncRecognizeRequest, opts ...gax.CallOption) (*speechpb.SyncRecognizeResponse, error) {
ctx = insertXGoog(ctx, c.xGoogHeader)
opts = append(c.CallOptions.SyncRecognize[0:len(c.CallOptions.SyncRecognize):len(c.CallOptions.SyncRecognize)], opts...)
var resp *speechpb.SyncRecognizeResponse
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.client.SyncRecognize(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// AsyncRecognize performs asynchronous speech recognition: receive results via the
// [google.longrunning.Operations]
// (/speech/reference/rest/v1beta1/operations#Operation)
// interface. Returns either an
// `Operation.error` or an `Operation.response` which contains
// an `AsyncRecognizeResponse` message.
func (c *Client) AsyncRecognize(ctx context.Context, req *speechpb.AsyncRecognizeRequest, opts ...gax.CallOption) (*AsyncRecognizeOperation, error) {
ctx = insertXGoog(ctx, c.xGoogHeader)
opts = append(c.CallOptions.AsyncRecognize[0:len(c.CallOptions.AsyncRecognize):len(c.CallOptions.AsyncRecognize)], opts...)
var resp *longrunningpb.Operation
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.client.AsyncRecognize(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return &AsyncRecognizeOperation{
lro: longrunning.InternalNewOperation(c.LROClient, resp),
}, nil
}
// StreamingRecognize performs bidirectional streaming speech recognition: receive results while
// sending audio. This method is only available via the gRPC API (not REST).
func (c *Client) StreamingRecognize(ctx context.Context, opts ...gax.CallOption) (speechpb.Speech_StreamingRecognizeClient, error) {
ctx = insertXGoog(ctx, c.xGoogHeader)
opts = append(c.CallOptions.StreamingRecognize[0:len(c.CallOptions.StreamingRecognize):len(c.CallOptions.StreamingRecognize)], opts...)
var resp speechpb.Speech_StreamingRecognizeClient
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.client.StreamingRecognize(ctx, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// AsyncRecognizeOperation manages a long-running operation from AsyncRecognize.
type AsyncRecognizeOperation struct {
lro *longrunning.Operation
}
// AsyncRecognizeOperation returns a new AsyncRecognizeOperation from a given name.
// The name must be that of a previously created AsyncRecognizeOperation, possibly from a different process.
func (c *Client) AsyncRecognizeOperation(name string) *AsyncRecognizeOperation {
return &AsyncRecognizeOperation{
lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
}
}
// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *AsyncRecognizeOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*speechpb.AsyncRecognizeResponse, error) {
var resp speechpb.AsyncRecognizeResponse
if err := op.lro.Wait(ctx, &resp, opts...); err != nil {
return nil, err
}
return &resp, nil
}
// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *AsyncRecognizeOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*speechpb.AsyncRecognizeResponse, error) {
var resp speechpb.AsyncRecognizeResponse
if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
return nil, err
}
if !op.Done() {
return nil, nil
}
return &resp, nil
}
// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *AsyncRecognizeOperation) Metadata() (*speechpb.AsyncRecognizeMetadata, error) {
var meta speechpb.AsyncRecognizeMetadata
if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
return nil, nil
} else if err != nil {
return nil, err
}
return &meta, nil
}
// Done reports whether the long-running operation has completed.
func (op *AsyncRecognizeOperation) Done() bool {
return op.lro.Done()
}
// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *AsyncRecognizeOperation) Name() string {
return op.lro.Name()
}