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prediction_client.go
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prediction_client.go
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// Copyright 2020 Google LLC
//
// 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
//
// https://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.
// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
package automl
import (
"context"
"fmt"
"math"
"net/url"
"time"
"cloud.google.com/go/longrunning"
lroauto "cloud.google.com/go/longrunning/autogen"
gax "github.com/googleapis/gax-go/v2"
"google.golang.org/api/option"
gtransport "google.golang.org/api/transport/grpc"
automlpb "google.golang.org/genproto/googleapis/cloud/automl/v1beta1"
longrunningpb "google.golang.org/genproto/googleapis/longrunning"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
var newPredictionClientHook clientHook
// PredictionCallOptions contains the retry settings for each method of PredictionClient.
type PredictionCallOptions struct {
Predict []gax.CallOption
BatchPredict []gax.CallOption
}
func defaultPredictionClientOptions() []option.ClientOption {
return []option.ClientOption{
option.WithEndpoint("automl.googleapis.com:443"),
option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
option.WithScopes(DefaultAuthScopes()...),
option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
grpc.MaxCallRecvMsgSize(math.MaxInt32))),
}
}
func defaultPredictionCallOptions() *PredictionCallOptions {
return &PredictionCallOptions{
Predict: []gax.CallOption{},
BatchPredict: []gax.CallOption{},
}
}
// PredictionClient is a client for interacting with Cloud AutoML API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type PredictionClient struct {
// Connection pool of gRPC connections to the service.
connPool gtransport.ConnPool
// flag to opt out of default deadlines via GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE
disableDeadlines bool
// The gRPC API client.
predictionClient automlpb.PredictionServiceClient
// 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 *PredictionCallOptions
// The x-goog-* metadata to be sent with each request.
xGoogMetadata metadata.MD
}
// NewPredictionClient creates a new prediction service client.
//
// AutoML Prediction API.
//
// On any input that is documented to expect a string parameter in
// snake_case or kebab-case, either of those cases is accepted.
func NewPredictionClient(ctx context.Context, opts ...option.ClientOption) (*PredictionClient, error) {
clientOpts := defaultPredictionClientOptions()
if newPredictionClientHook != nil {
hookOpts, err := newPredictionClientHook(ctx, clientHookParams{})
if err != nil {
return nil, err
}
clientOpts = append(clientOpts, hookOpts...)
}
disableDeadlines, err := checkDisableDeadlines()
if err != nil {
return nil, err
}
connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
if err != nil {
return nil, err
}
c := &PredictionClient{
connPool: connPool,
disableDeadlines: disableDeadlines,
CallOptions: defaultPredictionCallOptions(),
predictionClient: automlpb.NewPredictionServiceClient(connPool),
}
c.setGoogleClientInfo()
c.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
if err != nil {
// This error "should not happen", since we are just reusing old connection pool
// and never actually need to dial.
// If this does happen, we could leak connp. However, we cannot close conn:
// If the user invoked the constructor with option.WithGRPCConn,
// we would close a connection that's still in use.
// TODO: investigate error conditions.
return nil, err
}
return c, nil
}
// Connection returns a connection to the API service.
//
// Deprecated.
func (c *PredictionClient) Connection() *grpc.ClientConn {
return c.connPool.Conn()
}
// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *PredictionClient) Close() error {
return c.connPool.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 *PredictionClient) setGoogleClientInfo(keyval ...string) {
kv := append([]string{"gl-go", versionGo()}, keyval...)
kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}
// Predict perform an online prediction. The prediction result will be directly
// returned in the response.
// Available for following ML problems, and their expected request payloads:
//
// Image Classification - Image in .JPEG, .GIF or .PNG format, image_bytes
// up to 30MB.
//
// Image Object Detection - Image in .JPEG, .GIF or .PNG format, image_bytes
// up to 30MB.
//
// Text Classification - TextSnippet, content up to 60,000 characters,
// UTF-8 encoded.
//
// Text Extraction - TextSnippet, content up to 30,000 characters,
// UTF-8 NFC encoded.
//
// Translation - TextSnippet, content up to 25,000 characters, UTF-8
// encoded.
//
// Tables - Row, with column values matching the columns of the model,
// up to 5MB. Not available for FORECASTING
//
// prediction_type.
//
// Text Sentiment - TextSnippet, content up 500 characters, UTF-8
// encoded.
func (c *PredictionClient) Predict(ctx context.Context, req *automlpb.PredictRequest, opts ...gax.CallOption) (*automlpb.PredictResponse, error) {
if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
defer cancel()
ctx = cctx
}
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.Predict[0:len(c.CallOptions.Predict):len(c.CallOptions.Predict)], opts...)
var resp *automlpb.PredictResponse
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.predictionClient.Predict(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// BatchPredict perform a batch prediction. Unlike the online Predict, batch
// prediction result won’t be immediately available in the response. Instead,
// a long running operation object is returned. User can poll the operation
// result via GetOperation
// method. Once the operation is done, BatchPredictResult is returned in
// the response field.
// Available for following ML problems:
//
// Image Classification
//
// Image Object Detection
//
// Video Classification
//
// Video Object Tracking * Text Extraction
//
// Tables
func (c *PredictionClient) BatchPredict(ctx context.Context, req *automlpb.BatchPredictRequest, opts ...gax.CallOption) (*BatchPredictOperation, error) {
if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
defer cancel()
ctx = cctx
}
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.BatchPredict[0:len(c.CallOptions.BatchPredict):len(c.CallOptions.BatchPredict)], opts...)
var resp *longrunningpb.Operation
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.predictionClient.BatchPredict(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return &BatchPredictOperation{
lro: longrunning.InternalNewOperation(c.LROClient, resp),
}, nil
}
// BatchPredictOperation manages a long-running operation from BatchPredict.
type BatchPredictOperation struct {
lro *longrunning.Operation
}
// BatchPredictOperation returns a new BatchPredictOperation from a given name.
// The name must be that of a previously created BatchPredictOperation, possibly from a different process.
func (c *PredictionClient) BatchPredictOperation(name string) *BatchPredictOperation {
return &BatchPredictOperation{
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 *BatchPredictOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*automlpb.BatchPredictResult, error) {
var resp automlpb.BatchPredictResult
if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, 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 *BatchPredictOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*automlpb.BatchPredictResult, error) {
var resp automlpb.BatchPredictResult
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 *BatchPredictOperation) Metadata() (*automlpb.OperationMetadata, error) {
var meta automlpb.OperationMetadata
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 *BatchPredictOperation) 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 *BatchPredictOperation) Name() string {
return op.lro.Name()
}